* Re: [syzbot] [mm?] INFO: rcu detected stall in exit_to_user_mode_loop [not found] <6856d355.a00a0220.137b3.007d.GAE@google.com> @ 2025-07-12 0:18 ` syzbot 2025-07-28 21:30 ` syzbot 1 sibling, 0 replies; 6+ messages in thread From: syzbot @ 2025-07-12 0:18 UTC (permalink / raw) To: akpm, cgroups, hannes, linux-kernel, linux-mm, mhocko, muchun.song, roman.gushchin, shakeel.butt, syzkaller-bugs syzbot has found a reproducer for the following issue on: HEAD commit: 40f92e79b0aa Merge tag 'block-6.16-20250710' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=139f2d82580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b309c907eaab29da dashboard link: https://syzkaller.appspot.com/bug?extid=2642f347f7309b4880dc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=179f2d82580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-40f92e79.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8022f6fa9a48/vmlinux-40f92e79.xz kernel image: https://storage.googleapis.com/syzbot-assets/565fa9fa3299/bzImage-40f92e79.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2642f347f7309b4880dc@syzkaller.appspotmail.com #5: ffffffff8e13f160 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #5: ffffffff8e13f160 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #5: ffffffff8e13f160 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770 2 locks held by fido_id/5515: ============================================= rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (8 ticks this GP) idle=07d4/1/0x4000000000000000 softirq=37345/37345 fqs=0 rcu: (t=11778 jiffies g=24965 q=168 ncpus=1) rcu: rcu_preempt kthread starved for 11778 jiffies! g24965 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:28200 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> CPU: 0 UID: 0 PID: 5507 Comm: syz.0.16 Not tainted 6.16.0-rc5-syzkaller-00193-g40f92e79b0aa #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194 Code: 74 05 e8 3b 0d 56 f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 03 2e 1f f6 65 8b 05 ac 9a 2e 07 85 c0 74 40 48 c7 04 24 0e 36 RSP: 0018:ffffc90000007b00 EFLAGS: 00000206 RAX: fdeecc9c1cd86500 RBX: 0000000000000a02 RCX: fdeecc9c1cd86500 RDX: 0000000000000002 RSI: ffffffff8d998a4b RDI: 0000000000000001 RBP: ffffc90000007b90 R08: ffffffff8fa1f3f7 R09: 1ffffffff1f43e7e R10: dffffc0000000000 R11: fffffbfff1f43e7f R12: dffffc0000000000 R13: ffff8880596dc110 R14: ffff8880596dc218 R15: 1ffff92000000f60 FS: 0000000000000000(0000) GS:ffff88808d21b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005626cd793a30 CR3: 000000000df38000 CR4: 0000000000352ef0 Call Trace: <IRQ> call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 handle_softirqs+0x286/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__memcg_slab_free_hook+0x292/0x3d0 mm/memcontrol.c:3214 Code: 00 44 89 e1 d3 eb 4d 89 ef 4c 8b 6c 24 28 4c 8d 24 dd 00 00 00 00 4d 01 ec 4c 89 e3 48 c1 eb 03 48 b8 00 00 00 00 00 fc ff df <80> 3c 03 00 74 08 4c 89 e7 e8 20 ed f7 ff 49 8b 2c 24 48 85 ed 0f RSP: 0018:ffffc90002a3f518 EFLAGS: 00010a02 RAX: dffffc0000000000 RBX: 1ffff11009b39429 RCX: 0000000000000008 RDX: 00000000fffffee8 RSI: ffffea00010d1e40 RDI: ffffc90002a3f5b8 RBP: 0000000000000801 R08: ffff88804d9ca100 R09: 1ffff110086b40ab R10: dffffc0000000000 R11: ffffed10086b40ac R12: ffff88804d9ca148 R13: ffff88804d9ca100 R14: 0000000000000000 R15: ffffea00010d1e40 memcg_slab_free_hook mm/slub.c:2206 [inline] slab_free mm/slub.c:4640 [inline] kmem_cache_free+0x223/0x400 mm/slub.c:4745 anon_vma_free mm/rmap.c:137 [inline] __put_anon_vma+0x12b/0x2d0 mm/rmap.c:2756 put_anon_vma include/linux/rmap.h:117 [inline] unlink_anon_vmas+0x503/0x670 mm/rmap.c:444 free_pgtables+0x7bf/0xaf0 mm/memory.c:402 exit_mmap+0x444/0xb50 mm/mmap.c:1295 __mmput+0x118/0x420 kernel/fork.c:1121 exit_mm+0x1da/0x2c0 kernel/exit.c:581 do_exit+0x648/0x22e0 kernel/exit.c:952 do_group_exit+0x21c/0x2d0 kernel/exit.c:1105 get_signal+0x1286/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f506cd8e52b Code: Unable to access opcode bytes at 0x7f506cd8e501. RSP: 002b:00007fff239d9450 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffffc RBX: 00000000ffffff75 RCX: 00007f506cd8e52b RDX: 00007fff239d94d0 RSI: 0000000040085507 RDI: 0000000000000003 RBP: 0000000000000003 R08: 00007f506d0e0320 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00002000000002c0 R13: 0000000000000000 R14: 00007f506cfb5fa0 R15: 0000000000000004 </TASK> task:init state:S stack:18776 pid:1 tgid:1 ppid:0 task_flags:0x400100 flags:0x00004002 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 schedule_hrtimeout_range_clock+0x1c5/0x2f0 kernel/time/sleep_timeout.c:207 do_sigtimedwait+0x386/0x680 kernel/signal.c:3782 __do_sys_rt_sigtimedwait kernel/signal.c:3826 [inline] __se_sys_rt_sigtimedwait+0x1cd/0x2b0 kernel/signal.c:3804 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd0ae646407 RSP: 002b:00007ffc586c2070 EFLAGS: 00000202 ORIG_RAX: 0000000000000080 RAX: ffffffffffffffda RBX: 00007fd0ae4f6c80 RCX: 00007fd0ae646407 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fd0ae860498 RBP: 00007fd0ae860490 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000202 R12: 00007fd0ae860490 R13: 00007ffc586c20ec R14: 00007fd0ae8a0000 R15: 0000559f223e1d98 </TASK> task:kthreadd state:S stack:25752 pid:2 tgid:2 ppid:0 task_flags:0x208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 kthreadd+0x3e3/0x770 kernel/kthread.c:835 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:pool_workqueue_ state:S stack:28552 pid:3 tgid:3 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 kthread_worker_fn+0x4c2/0xb60 kernel/kthread.c:1017 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-rcu_g state:I stack:30152 pid:4 tgid:4 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-sync_ state:I stack:30248 pid:5 tgid:5 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-kvfre state:I stack:30248 pid:6 tgid:6 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-slub_ state:I stack:30248 pid:7 tgid:7 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-netns state:I stack:30328 pid:8 tgid:8 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/0:0 state:R running task stack:19848 pid:9 tgid:9 ppid:2 task_flags:0x4208060 flags:0x00004000 Workqueue: 0x0 (events) Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 worker_thread+0xa82/0xda0 kernel/workqueue.c:3417 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/0:1 state:I stack:25032 pid:10 tgid:10 ppid:2 task_flags:0x4208060 flags:0x00004000 Workqueue: 0x0 (wg-crypt-wg2) Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 worker_thread+0xa82/0xda0 kernel/workqueue.c:3417 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/0:0H state:I stack:27880 pid:11 tgid:11 ppid:2 task_flags:0x4208060 flags:0x00004000 Workqueue: 0x0 (events_highpri) Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 worker_thread+0xa82/0xda0 kernel/workqueue.c:3417 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/u4:0 state:I stack:23016 pid:12 tgid:12 ppid:2 task_flags:0x4208060 flags:0x00004000 Workqueue: 0x0 (events_unbound) Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 worker_thread+0xa82/0xda0 kernel/workqueue.c:3417 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/u4:1 state:I stack:22472 pid:13 tgid:13 ppid:2 task_flags:0x4208060 flags:0x00004000 Workqueue: 0x0 (events_unbound) Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 worker_thread+0xa82/0xda0 kernel/workqueue.c:3417 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-mm_pe state:I stack:30248 pid:14 tgid:14 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:ksoftirqd/0 state:R running task stack:21512 pid:15 tgid:15 ppid:2 task_flags:0x4208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 smpboot_thread_fn+0x5bd/0xa60 kernel/smpboot.c:160 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:rcu_preempt state:R running task stack:28200 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:rcu_exp_par_gp_ state:S stack:30312 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 kthread_worker_fn+0x4c2/0xb60 kernel/kthread.c:1017 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:rcu_exp_gp_kthr state:S stack:29000 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 kthread_worker_fn+0x4c2/0xb60 kernel/kthread.c:1017 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:migration/0 state:R running task stack:29952 pid:19 tgid:19 ppid:2 task_flags:0x4208040 flags:0x00004000 Stopper: 0x0 <- 0x0 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 smpboot_thread_fn+0x5bd/0xa60 kernel/smpboot.c:160 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:cpuhp/0 state:S stack:25336 pid:20 tgid:20 ppid:2 task_flags:0x4208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 smpboot_thread_fn+0x5bd/0xa60 kernel/smpboot.c:160 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kdevtmpfs state:S stack:25416 pid:21 tgid:21 ppid:2 task_flags:0x208140 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 devtmpfs_work_loop+0xce2/0xd20 drivers/base/devtmpfs.c:413 devtmpfsd+0x4d/0x50 drivers/base/devtmpfs.c:446 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-inet_ state:I stack:30248 pid:22 tgid:22 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:rcu_tasks_kthre state:I stack:28168 pid:23 tgid:23 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rcu_tasks_one_gp+0x877/0xdf0 kernel/rcu/tasks.h:611 rcu_tasks_kthread+0x195/0x1c0 kernel/rcu/tasks.h:658 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:rcu_tasks_trace state:I stack:28584 pid:24 tgid:24 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rcu_tasks_one_gp+0x877/0xdf0 kernel/rcu/tasks.h:611 rcu_tasks_kthread+0x195/0x1c0 kernel/rcu/tasks.h:658 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kauditd state:S stack:28776 pid:25 tgid:25 ppid:2 task_flags:0x200040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 kauditd_thread+0x894/0x9a0 kernel/audit.c:911 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:khungtaskd state:R running task stack:29496 pid:26 tgid:26 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99 watchdog+0x90/0x1030 kernel/hung_task.c:474 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:oom_reaper state:S stack:30184 pid:27 tgid:27 ppid:2 task_flags:0x200040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 oom_reaper+0x112/0xae0 mm/oom_kill.c:650 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-write state:I stack:30248 pid:28 tgid:28 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kcompactd0 state:R running task stack:25480 pid:29 tgid:29 ppid:2 task_flags:0x210040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99 kcompactd+0x406/0x1290 mm/compaction.c:3223 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kcompactd1 state:R running task stack:25088 pid:30 tgid:30 ppid:2 task_flags:0x210040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99 kcompactd+0x406/0x1290 mm/compaction.c:3223 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/u4:2 state:R running task stack:23512 pid:31 tgid:31 ppid:2 task_flags:0x4208160 flags:0x00004000 Workqueue: 0x0 (events_unbound) Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 worker_thread+0xa82/0xda0 kernel/workqueue.c:3417 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:ksmd state:S stack:29800 pid:32 tgid:32 ppid:2 task_flags:0x200040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 ksm_scan_thread+0x38e/0x4b0 mm/ksm.c:2692 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:khugepaged state:S stack:29384 pid:33 tgid:33 ppid:2 task_flags:0x200040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 khugepaged_wait_work mm/khugepaged.c:2586 [inline] khugepaged+0x13b3/0x1690 mm/khugepaged.c:2598 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-kbloc state:I stack:30248 pid:34 tgid:34 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-blkcg state:I stack:30248 pid:35 tgid:35 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-kinte state:I stack:30248 pid:36 tgid:36 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:irq/9-acpi state:S stack:30152 pid:37 tgid:37 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 irq_wait_for_interrupt kernel/irq/manage.c:1065 [inline] irq_thread+0x482/0x670 kernel/irq/manage.c:1253 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-tpm_d state:I stack:30248 pid:38 tgid:38 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-ata_s state:I stack:30248 pid:39 tgid:39 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-md state:I stack:30248 pid:40 tgid:40 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-md_bi state:I stack:30248 pid:41 tgid:41 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-edac- state:I stack:30248 pid:42 tgid:42 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/u4:3 state:I stack:21720 pid:43 tgid:43 ppid:2 task_flags:0x4208060 flags:0x00004000 Workqueue: 0x0 (events_unbound) Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 worker_thread+0xa82/0xda0 kernel/workqueue.c:3417 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-ib-co state:I stack:30248 pid:44 tgid:44 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/u5:0 state:I stack:25400 pid:45 tgid:45 ppid:2 task_flags:0x4208060 flags:0x00004000 Workqueue: 0x0 (hci0) Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 worker_thread+0xa82/0xda0 kernel/workqueue.c:3417 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-ib-co state:I stack:30248 pid:46 tgid:46 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-ib_mc state:I stack:30248 pid:47 tgid:47 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-ib_nl state:I stack:30248 pid:48 tgid:48 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/0:1H state:I stack:24056 pid:49 tgid:49 ppid:2 task_flags:0x4208060 flags:0x00004000 Workqueue: 0x0 (kblockd) Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 worker_thread+0xa82/0xda0 kernel/workqueue.c:3417 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-rpcio state:I stack:30248 pid:50 tgid:50 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-xprti state:I stack:30248 pid:51 tgid:51 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-cfg80 state:I stack:30248 pid:52 tgid:52 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/u4:4 state:I stack:23272 pid:54 tgid:54 ppid:2 task_flags:0x4208060 flags:0x00004000 Workqueue: 0x0 (events_unbound) Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 worker_thread+0xa82/0xda0 kernel/workqueue.c:3417 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/0:2 state:I stack:23912 pid:55 tgid:55 ppid:2 task_flags:0x4208060 flags:0x00004000 Workqueue: 0x0 (wg-crypt-wg2) Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 worker_thread+0xa82/0xda0 kernel/workqueue.c:3417 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kswapd0 state:S stack:27544 pid:78 tgid:78 ppid:2 task_flags:0x220840 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 kswapd_try_to_sleep mm/vmscan.c:7271 [inline] kswapd+0x6ea/0x2830 mm/vmscan.c:7329 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kswapd1 state:S stack:23512 pid:79 tgid:79 ppid:2 task_flags:0x220840 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 kswapd_try_to_sleep mm/vmscan.c:7271 [inline] kswapd+0x6ea/0x2830 mm/vmscan.c:7329 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:ecryptfs-kthrea state:S stack:30280 pid:84 tgid:84 ppid:2 task_flags:0x200040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 ecryptfs_threadfn+0x14e/0x3c0 fs/ecryptfs/kthread.c:48 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nfsio state:I stack:30248 pid:87 tgid:87 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-cifsi state:I stack:30248 pid:88 tgid:88 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-smb3d state:I stack:30248 pid:89 tgid:89 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-cifsf state:I stack:30248 pid:90 tgid:90 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-cifso state:I stack:30248 pid:91 tgid:91 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-defer state:I stack:30248 pid:92 tgid:92 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-serve state:I stack:30248 pid:93 tgid:93 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-cfid_ state:I stack:30248 pid:94 tgid:94 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-cifs- state:I stack:30248 pid:95 tgid:95 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:jfsIO state:S stack:30440 pid:102 tgid:102 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 jfsIOWait+0x10a/0x270 fs/jfs/jfs_logmgr.c:2331 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:jfsCommit state:S stack:30152 pid:103 tgid:103 ppid:2 task_flags:0x200040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 jfs_lazycommit+0x852/0xa90 fs/jfs/jfs_txnmgr.c:2761 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:jfsSync state:S stack:30344 pid:104 tgid:104 ppid:2 task_flags:0x200040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 jfs_sync+0x4b4/0x650 fs/jfs/jfs_txnmgr.c:2948 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-xfsal state:I stack:30248 pid:105 tgid:105 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-xfs_m state:I stack:30248 pid:106 tgid:106 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-user_ state:I stack:30248 pid:108 tgid:108 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-gfs2_ state:I stack:30248 pid:110 tgid:110 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-pencr state:I stack:30248 pid:113 tgid:113 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-pdecr state:I stack:30248 pid:115 tgid:115 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-crypt state:I stack:30248 pid:117 tgid:117 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-kthro state:I stack:30248 pid:119 tgid:119 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:irq/26-aerdrv state:S stack:30152 pid:138 tgid:138 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 irq_wait_for_interrupt kernel/irq/manage.c:1065 [inline] irq_thread+0x482/0x670 kernel/irq/manage.c:1253 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-acpi_ state:I stack:30248 pid:157 tgid:157 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nfit state:I stack:30248 pid:162 tgid:162 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:hwrng state:R running task stack:29336 pid:756 tgid:756 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99 hwrng_fillfn+0x2f0/0x400 drivers/char/hw_random/core.c:515 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:card1-crtc0 state:S stack:30392 pid:778 tgid:778 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 kthread_worker_fn+0x4c2/0xb60 kernel/kthread.c:1017 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nbd0- state:I stack:30248 pid:840 tgid:840 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nbd1- state:I stack:30248 pid:843 tgid:843 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nbd2- state:I stack:30248 pid:844 tgid:844 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nbd3- state:I stack:30248 pid:849 tgid:849 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nbd4- state:I stack:30248 pid:852 tgid:852 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nbd5- state:I stack:30248 pid:855 tgid:855 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nbd6- state:I stack:30248 pid:858 tgid:858 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nbd7- state:I stack:30248 pid:861 tgid:861 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nbd8- state:I stack:30248 pid:864 tgid:864 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nbd9- state:I stack:30248 pid:867 tgid:867 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nbd10 state:I stack:30248 pid:870 tgid:870 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nbd11 state:I stack:30248 pid:873 tgid:873 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nbd12 state:I stack:30248 pid:876 tgid:876 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nbd13 state:I stack:30248 pid:879 tgid:879 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nbd14 state:I stack:30248 pid:882 tgid:882 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nbd15 state:I stack:30248 pid:885 tgid:885 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-iscsi state:I stack:30248 pid:945 tgid:945 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nvme- state:I stack:30248 pid:962 tgid:962 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nvme- state:I stack:30248 pid:965 tgid:965 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nvme- state:I stack:30248 pid:967 tgid:967 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nvme_ state:I stack:30248 pid:978 tgid:978 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nvmet state:I stack:30248 pid:980 tgid:980 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nvmet state:I stack:30248 pid:981 tgid:981 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> task:kworker/R-nvmet state:I stack:29912 pid:982 tgid:982 ppid:2 task_flags:0x4208060 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5401 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6790 __schedule_loop kernel/sched/core.c:6868 [inline] schedule+0x165/0x360 kernel/sched/core.c:6883 rescuer_thread+0xc69/0xdd0 kernel/workqueue.c:3552 kthread+0x70e/0x8a0 kernel/kthread.c:46 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [syzbot] [mm?] INFO: rcu detected stall in exit_to_user_mode_loop [not found] <6856d355.a00a0220.137b3.007d.GAE@google.com> 2025-07-12 0:18 ` [syzbot] [mm?] INFO: rcu detected stall in exit_to_user_mode_loop syzbot @ 2025-07-28 21:30 ` syzbot 2026-08-31 8:41 ` Junjie Cao 2026-09-01 1:43 ` Junjie Cao 1 sibling, 2 replies; 6+ messages in thread From: syzbot @ 2025-07-28 21:30 UTC (permalink / raw) To: akpm, cgroups, hannes, jackmanb, linux-kernel, linux-mm, mhocko, mhocko, muchun.song, netdev, roman.gushchin, shakeel.butt, surenb, syzkaller-bugs, vbabka, ziy syzbot has found a reproducer for the following issue on: HEAD commit: afd8c2c9e2e2 Merge branch 'ipv6-f6i-fib6_siblings-and-rt-f.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=13c71034580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a4bcc0a11b3192be dashboard link: https://syzkaller.appspot.com/bug?extid=2642f347f7309b4880dc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17b284a2580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17c71034580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/6f29edec8e85/disk-afd8c2c9.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8490ef85f5cd/vmlinux-afd8c2c9.xz kernel image: https://storage.googleapis.com/syzbot-assets/1357e17669cb/bzImage-afd8c2c9.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2642f347f7309b4880dc@syzkaller.appspotmail.com rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (3 ticks this GP) idle=8da4/1/0x4000000000000000 softirq=18768/18768 fqs=0 rcu: (detected by 1, t=10502 jiffies, g=13833, q=887 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 5983 Comm: syz-executor Not tainted 6.16.0-rc7-syzkaller-00100-gafd8c2c9e2e2 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:__lock_acquire+0x316/0xd20 kernel/locking/lockdep.c:5188 Code: 8b 54 24 0c 83 e2 01 c1 e2 12 44 09 e2 41 c1 e6 14 41 09 d6 8b 54 24 10 c1 e2 13 c1 e5 15 09 d5 09 cd 44 09 f5 41 89 6c c7 20 <45> 89 44 c7 24 4c 89 7c 24 10 4d 8d 34 c7 81 e5 ff 1f 00 00 48 0f RSP: 0018:ffffc90000007b40 EFLAGS: 00000002 RAX: 000000000000000a RBX: ffffffff8e13f0e0 RCX: 0000000000000007 RDX: 0000000000080000 RSI: 0000000000004000 RDI: ffff88802c368000 RBP: 00000000000a4007 R08: 0000000000000000 R09: ffffffff898d70e8 R10: dffffc0000000000 R11: ffffed100fc2785e R12: 0000000000024000 R13: 0000000000000000 R14: 0000000000024000 R15: ffff88802c368af0 FS: 0000000000000000(0000) GS:ffff888125c23000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055556e2015c8 CR3: 000000000df38000 CR4: 00000000003526f0 Call Trace: <IRQ> lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] advance_sched+0xa14/0xc90 net/sched/sch_taprio.c:985 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:debug_lockdep_rcu_enabled+0xf/0x40 kernel/rcu/update.c:320 Code: cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 31 c0 83 3d 17 30 34 04 00 74 1e <83> 3d 3a 60 34 04 00 74 15 65 48 8b 0c 25 08 d0 9f 92 31 c0 83 b9 RSP: 0018:ffffc90003f0ef70 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffffffff90d8d001 RCX: ffffc90003f0ff60 RDX: ffffc90003f0f001 RSI: dffffc0000000000 RDI: ffffc90003f0f050 RBP: dffffc0000000000 R08: ffffc90003f0ff48 R09: 0000000000000000 R10: ffffc90003f0f098 R11: fffff520007e1e15 R12: ffffc90003f0ff58 R13: ffffc90003f08000 R14: ffffc90003f0f048 R15: ffffffff8172aae5 rcu_read_unlock include/linux/rcupdate.h:869 [inline] class_rcu_destructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0x195c/0x2390 arch/x86/kernel/unwind_orc.c:680 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 save_stack+0xf5/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:308 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] free_unref_folios+0xc66/0x14d0 mm/page_alloc.c:2763 folios_put_refs+0x559/0x640 mm/swap.c:992 free_pages_and_swap_cache+0x277/0x520 mm/swap_state.c:264 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:397 [inline] tlb_flush_mmu+0x3a0/0x680 mm/mmu_gather.c:404 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:497 exit_mmap+0x44c/0xb50 mm/mmap.c:1297 __mmput+0x118/0x420 kernel/fork.c:1121 exit_mm+0x1da/0x2c0 kernel/exit.c:581 do_exit+0x648/0x22e0 kernel/exit.c:952 do_group_exit+0x21c/0x2d0 kernel/exit.c:1105 get_signal+0x1286/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f730c585213 Code: Unable to access opcode bytes at 0x7f730c5851e9. RSP: 002b:00007ffe0103af48 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: fffffffffffffffc RBX: 0000000000000000 RCX: 00007f730c585213 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 000055556e1e67d0 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000000927c0 R14: 000000000003604b R15: 00007ffe0103b0e0 </TASK> rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g13833 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=10563 rcu: rcu_preempt kthread starved for 10502 jiffies! g13833 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:I stack:26792 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5397 [inline] __schedule+0x16fd/0x4cf0 kernel/sched/core.c:6786 __schedule_loop kernel/sched/core.c:6864 [inline] schedule+0x165/0x360 kernel/sched/core.c:6879 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [syzbot] [mm?] INFO: rcu detected stall in exit_to_user_mode_loop 2025-07-28 21:30 ` syzbot @ 2026-08-31 8:41 ` Junjie Cao 2026-08-31 11:12 ` syzbot 2026-09-01 1:43 ` Junjie Cao 1 sibling, 1 reply; 6+ messages in thread From: Junjie Cao @ 2026-08-31 8:41 UTC (permalink / raw) To: syzbot+2642f347f7309b4880dc Cc: akpm, cgroups, hannes, jackmanb, linux-kernel, linux-mm, mhocko, mhocko, muchun.song, netdev, roman.gushchin, shakeel.butt, surenb, syzkaller-bugs, vbabka, ziy, hdanton, davem, edumazet, kuba, pabeni, horms, jhs, jiri, vinicius.gomes #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git a8455260b2e9c024d1872ac1c094793d55a7e537 diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c index 39ac5b97aa3a..901dfd2484e1 100644 --- a/net/sched/sch_taprio.c +++ b/net/sched/sch_taprio.c @@ -83,6 +83,10 @@ struct sched_gate_list { s64 cycle_time; s64 cycle_time_extension; s64 base_time; + /* min(cycle_time, sum of intervals): the software schedule restarts + * the list after the last entry even when cycle_time is not up yet. + */ + s64 period; }; struct taprio_sched { @@ -871,12 +875,13 @@ static struct sk_buff *taprio_dequeue(struct Qdisc *sch) } static bool should_restart_cycle(const struct sched_gate_list *oper, - const struct sched_entry *entry) + const struct sched_entry *entry, + ktime_t end_time) { if (list_is_last(&entry->list, &oper->entries)) return true; - if (ktime_compare(entry->end_time, oper->cycle_end_time) == 0) + if (ktime_compare(end_time, oper->cycle_end_time) == 0) return true; return false; @@ -925,8 +930,9 @@ static enum hrtimer_restart advance_sched(struct hrtimer *timer) int num_tc = netdev_get_num_tc(dev); struct sched_entry *entry, *next; struct Qdisc *sch = q->root; - ktime_t end_time; - int tc; + ktime_t end_time, next_start, now; + int budget, tc; + s64 behind; spin_lock(&q->current_entry_lock); entry = rcu_dereference_protected(q->current_entry, @@ -952,23 +958,49 @@ static enum hrtimer_restart advance_sched(struct hrtimer *timer) goto first_run; } - if (should_restart_cycle(oper, entry)) { - next = list_first_entry(&oper->entries, struct sched_entry, - list); - oper->cycle_end_time = ktime_add_ns(oper->cycle_end_time, - oper->cycle_time); - } else { - next = list_next_entry(entry, list); + now = hrtimer_cb_get_time(timer); + end_time = entry->end_time; + behind = ktime_sub(now, end_time); + + /* Behind, e.g. delayed timer or stepped clock: skip whole periods + * arithmetically and walk at most one more to the entry covering + * now, instead of replaying the backlog one expiry at a time. The + * cap bounds the walk; a leftover is picked up by the next expiry. + */ + if (unlikely(behind >= oper->period)) { + s64 jump = div64_s64(behind, oper->period) * oper->period; + + end_time = ktime_add_ns(end_time, jump); + oper->cycle_end_time = ktime_add_ns(oper->cycle_end_time, jump); } - end_time = ktime_add_ns(entry->end_time, next->interval); - end_time = min_t(ktime_t, end_time, oper->cycle_end_time); + budget = 2 * oper->num_entries; + do { + if (should_restart_cycle(oper, entry, end_time)) { + next = list_first_entry(&oper->entries, + struct sched_entry, list); + oper->cycle_end_time = ktime_add_ns(oper->cycle_end_time, + oper->period); + } else { + next = list_next_entry(entry, list); + } + + next_start = end_time; + end_time = ktime_add_ns(next_start, next->interval); + end_time = min_t(ktime_t, end_time, oper->cycle_end_time); + entry = next; + } while (unlikely(ktime_compare(end_time, now) <= 0) && budget--); + /* next can be the entry already published as q->current_entry (a + * single-entry schedule, or a catch-up of whole periods), so the + * close times and budgets below are rewritten in place while + * taprio_dequeue_from_txq() may be reading them. + */ for (tc = 0; tc < num_tc; tc++) { if (next->gate_duration[tc] == oper->cycle_time) next->gate_close_time[tc] = KTIME_MAX; else - next->gate_close_time[tc] = ktime_add_ns(entry->end_time, + next->gate_close_time[tc] = ktime_add_ns(next_start, next->gate_duration[tc]); } @@ -1130,6 +1162,8 @@ static int parse_taprio_schedule(struct taprio_sched *q, struct nlattr **tb, struct sched_gate_list *new, struct netlink_ext_ack *extack) { + struct sched_entry *entry; + ktime_t cycle = 0; int err = 0; if (tb[TCA_TAPRIO_ATTR_SCHED_SINGLE_ENTRY]) { @@ -1152,13 +1186,10 @@ static int parse_taprio_schedule(struct taprio_sched *q, struct nlattr **tb, if (err < 0) return err; - if (!new->cycle_time) { - struct sched_entry *entry; - ktime_t cycle = 0; - - list_for_each_entry(entry, &new->entries, list) - cycle = ktime_add_ns(cycle, entry->interval); + list_for_each_entry(entry, &new->entries, list) + cycle = ktime_add_ns(cycle, entry->interval); + if (!new->cycle_time) { if (cycle < 0 || cycle > INT_MAX) { NL_SET_ERR_MSG(extack, "'cycle_time' is too big"); return -EINVAL; @@ -1172,6 +1203,7 @@ static int parse_taprio_schedule(struct taprio_sched *q, struct nlattr **tb, return -EINVAL; } + new->period = min(new->cycle_time, cycle); taprio_calculate_gate_durations(q, new); return 0; ^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [syzbot] [mm?] INFO: rcu detected stall in exit_to_user_mode_loop 2026-08-31 8:41 ` Junjie Cao @ 2026-08-31 11:12 ` syzbot 0 siblings, 0 replies; 6+ messages in thread From: syzbot @ 2026-08-31 11:12 UTC (permalink / raw) To: akpm, cgroups, davem, edumazet, hannes, hdanton, horms, jackmanb, jhs, jiri, junjie.cao, kuba, linux-kernel, linux-mm, mhocko, mhocko, muchun.song, netdev, pabeni, roman.gushchin, shakeel.butt, surenb, syzkaller-bugs, vbabka, vinicius.gomes, ziy Hello, syzbot tried to test the proposed patch but the build/boot failed: 2.992004][ T1] Mandatory Access Control activated. [ 2.993509][ T1] pnp: PnP ACPI init [ 3.023863][ T1] pnp: PnP ACPI: found 6 devices [ 3.105394][ T1] clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 2085701024 ns [ 3.113910][ T1] NET: Registered PF_INET protocol family [ 3.116610][ T1] IP idents hash table entries: 131072 (order: 8, 1048576 bytes, vmalloc) [ 3.128889][ T1] tcp_listen_portaddr_hash hash table entries: 4096 (order: 7, 294912 bytes, vmalloc) [ 3.130899][ T1] Table-perturb hash table entries: 65536 (order: 6, 262144 bytes, vmalloc) [ 3.133075][ T1] TCP established hash table entries: 65536 (order: 7, 524288 bytes, vmalloc) [ 3.144444][ T1] TCP bind hash table entries: 65536 (order: 12, 9437184 bytes, vmalloc hugepage) [ 3.151706][ T1] TCP: Hash tables configured (established 65536 bind 65536) [ 3.155107][ T1] MPTCP token hash table entries: 8192 (order: 8, 720896 bytes, vmalloc) [ 3.158207][ T1] UDP hash table entries: 4096 (order: 8, 1048576 bytes, vmalloc) [ 3.161213][ T1] NET: Registered PF_UNIX/PF_LOCAL protocol family [ 3.166692][ T1] RPC: Registered named UNIX socket transport module. [ 3.167740][ T1] RPC: Registered udp transport module. [ 3.168610][ T1] RPC: Registered tcp transport module. [ 3.169492][ T1] RPC: Registered tcp-with-tls transport module. [ 3.170446][ T1] RPC: Registered tcp NFSv4.1 backchannel transport module. [ 3.187812][ T1] NET: Registered PF_XDP protocol family [ 3.189221][ T1] pci_bus 0000:00: resource 4 [io 0x0000-0x0cf7 window] [ 3.190367][ T1] pci_bus 0000:00: resource 5 [io 0x0d00-0xffff window] [ 3.191848][ T1] pci_bus 0000:00: resource 6 [mem 0x000a0000-0x000bffff window] [ 3.193134][ T1] pci_bus 0000:00: resource 7 [mem 0xc0000000-0xfebfefff window] [ 3.195979][ T1] pci 0000:00:00.0: Limiting direct PCI/PCI transfers [ 3.197272][ T1] PCI: CLS 0 bytes, default 64 [ 3.198358][ T1] PCI-DMA: Using software bounce buffering for IO (SWIOTLB) [ 3.199469][ T1] software IO TLB: mapped [mem 0x00000000b4400000-0x00000000b8400000] (64MB) [ 3.201954][ T1] ACPI: bus type thunderbolt registered [ 3.211140][ T1] RAPL PMU: API unit is 2^-32 Joules, 0 fixed counters, 10737418240 ms ovfl timer [ 3.216011][ T61] kworker/u8:1 (61) used greatest stack depth: 27880 bytes left [ 3.236610][ T1] kvm_amd: CPU 0 isn't AMD or Hygon [ 3.236649][ T1] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x285d5483c8d, max_idle_ns: 440795228937 ns [ 3.239738][ T1] clocksource: Switched to clocksource tsc [ 3.247879][ T67] kworker/u8:3 (67) used greatest stack depth: 27160 bytes left [ 3.274579][ T1] Initialise system trusted keyrings [ 3.278300][ T1] workingset: timestamp_bits=40 (anon: 35) max_order=21 bucket_order=0 (anon: 0) [ 3.286066][ T1] DLM installed [ 3.291910][ T1] squashfs: version 4.0 (2009/01/31) Phillip Lougher [ 3.299536][ T1] NFS: Registering the id_resolver key type [ 3.299710][ T1] Key type id_resolver registered [ 3.299721][ T1] Key type id_legacy registered [ 3.299981][ T1] nfs4filelayout_init: NFSv4 File Layout Driver Registering... [ 3.300091][ T1] nfs4flexfilelayout_init: NFSv4 Flexfile Layout Driver Registering... [ 3.304030][ T1] smbdirect: subsystem loading... [ 3.312200][ T1] smbdirect: subsystem loaded [ 3.342789][ T1] Key type cifs.spnego registered [ 3.343043][ T1] Key type cifs.idmap registered [ 3.346819][ T1] ntfs3: Enabled Linux POSIX ACLs support [ 3.346847][ T1] ntfs3: Read-only LZX/Xpress compression included [ 3.347118][ T1] jffs2: version 2.2. (NAND) (SUMMARY) © 2001-2006 Red Hat, Inc. [ 3.349230][ T1] romfs: ROMFS MTD (C) 2007 Red Hat, Inc. [ 3.349425][ T1] QNX4 filesystem 0.2.3 registered. [ 3.349531][ T1] qnx6: QNX6 filesystem 1.0.0 registered. [ 3.350763][ T1] fuse: init (API version 7.46) [ 3.354681][ T1] orangefs_debugfs_init: called with debug mask: :none: :0: [ 3.355943][ T1] orangefs_init: module version upstream loaded [ 3.356821][ T1] JFS: nTxBlock = 8192, nTxLock = 65536 [ 3.369044][ T1] SGI XFS with ACLs, security attributes, realtime, scrub, repair, quota, no debug enabled [ 3.378590][ T1] 9p: Installing v9fs 9p2000 file system support [ 3.380623][ T1] NILFS version 2 loaded [ 3.381303][ T1] befs: version: 0.9.3 [ 3.382815][ T1] ocfs2: Registered cluster interface o2cb [ 3.384592][ T1] ocfs2: Registered cluster interface user [ 3.386061][ T1] OCFS2 User DLM kernel interface loaded [ 3.408890][ T1] gfs2: GFS2 installed [ 3.423843][ T1] ceph: loaded (mds proto 32) [ 3.437963][ T1] NET: Registered PF_ALG protocol family [ 3.439495][ T1] async_tx: api initialized (async) [ 3.440455][ T1] Key type asymmetric registered [ 3.441477][ T1] Asymmetric key parser 'x509' registered [ 3.442418][ T1] Asymmetric key parser 'pkcs8' registered [ 3.443295][ T1] Key type pkcs7_test registered [ 3.444626][ T1] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 239) [ 3.448227][ T1] io scheduler mq-deadline registered [ 3.449247][ T1] io scheduler kyber registered [ 3.450679][ T1] io scheduler bfq registered [ 3.452609][ T1] raid6: skipped pq benchmark and selected avx512x4 [ 3.470190][ T1] input: Power Button as /devices/platform/LNXPWRBN:00/input/input0 [ 3.473842][ T1] ACPI: button: Power Button [PWRF] [ 3.477749][ T1] input: Sleep Button as /devices/platform/LNXSLPBN:00/input/input1 [ 3.480757][ T1] ACPI: button: Sleep Button [SLPF] [ 3.501883][ T1] ioatdma: Intel(R) QuickData Technology Driver 5.00 [ 3.538986][ T1] ACPI: \_SB_.LNKC: Enabled at IRQ 11 [ 3.540120][ T1] virtio-pci 0000:00:03.0: virtio_pci: leaving for legacy driver [ 3.573242][ T1] ACPI: \_SB_.LNKD: Enabled at IRQ 10 [ 3.574257][ T1] virtio-pci 0000:00:04.0: virtio_pci: leaving for legacy driver [ 3.611123][ T1] ACPI: \_SB_.LNKB: Enabled at IRQ 10 [ 3.612311][ T1] virtio-pci 0000:00:06.0: virtio_pci: leaving for legacy driver [ 4.026288][ T629] kworker/u8:6 (629) used greatest stack depth: 26904 bytes left [ 4.103079][ T1] N_HDLC line discipline registered with maxframe=4096 [ 4.105350][ T1] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled [ 4.114516][ T1] 00:02: ttyS0 I/O:0x3f8 (irq = 4, base_baud = 115200) is a 16550A [ 4.129686][ T1] 00:03: ttyS1 I/O:0x2f8 (irq = 3, base_baud = 115200) is a 16550A [ 4.144792][ T1] 00:04: ttyS2 I/O:0x3e8 (irq = 6, base_baud = 115200) is a 16550A [ 4.169157][ T1] 00:05: ttyS3 I/O:0x2e8 (irq = 7, base_baud = 115200) is a 16550A [ 4.206372][ T1] Non-volatile memory driver v1.3 [ 4.228763][ T1] usbcore: registered new interface driver xillyusb [ 4.234701][ T1] ACPI: bus type drm_connector registered [ 4.245698][ T1] [drm] Initialized vgem 1.0.0 for vgem on minor 0 [ 4.252028][ T1] ------------[ cut here ]------------ [ 4.252067][ T1] [PLANE:35:plane-0] pixel format with alpha exposed but blend mode not setup [ 4.252085][ T1] WARNING: drivers/gpu/drm/drm_mode_config.c:872 at drm_mode_config_validate+0xfb4/0x1be0, CPU#0: swapper/0/1 [ 4.256488][ T1] Modules linked in: [ 4.257080][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) [ 4.258850][ T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026 [ 4.260606][ T1] RIP: 0010:drm_mode_config_validate+0xfbb/0x1be0 [ 4.261603][ T1] Code: 00 49 8b 57 18 48 89 f8 48 c1 e8 03 0f b6 04 28 84 c0 74 08 3c 03 0f 8e 00 0b 00 00 48 8d 3d 5c 1f 7e 0b 41 8b b7 c8 00 00 00 <67> 48 0f b9 3a e9 fa fd ff ff 48 8b 5c 24 20 e8 d1 aa 39 fc 48 8d [ 4.264757][ T1] RSP: 0000:ffffc90000067c18 EFLAGS: 00010246 [ 4.265631][ T1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 4.266846][ T1] RDX: ffff88802708ff80 RSI: 0000000000000023 RDI: ffffffff91504ba0 [ 4.268445][ T1] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000 [ 4.269744][ T1] R10: 0000000000000001 R11: 0000000000000000 R12: ffffed1004ea1e23 [ 4.270879][ T1] R13: ffffed1004ea1e24 R14: 0000000000000001 R15: ffff88802750f028 [ 4.272125][ T1] FS: 0000000000000000(0000) GS:ffff888123b65000(0000) knlGS:0000000000000000 [ 4.273520][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 4.274598][ T1] CR2: ffff88823ffff000 CR3: 000000000eb96000 CR4: 00000000003526f0 [ 4.275805][ T1] Call Trace: [ 4.276304][ T1] <TASK> [ 4.276744][ T1] drm_dev_register+0x56e/0x7b0 [ 4.277432][ T1] vkms_create+0x491/0x5b0 [ 4.278450][ T1] ? __pfx_vkms_init+0x10/0x10 [ 4.279187][ T1] vkms_init+0x98/0xe0 [ 4.279870][ T1] do_one_initcall+0x11c/0x6f0 [ 4.280657][ T1] ? __pfx_do_one_initcall+0x10/0x10 [ 4.281473][ T1] ? kernel_init_freeable+0x4ca/0x7b0 [ 4.282372][ T1] kernel_init_freeable+0x6ea/0x7b0 [ 4.283205][ T1] ? __pfx_kernel_init+0x10/0x10 [ 4.283952][ T1] kernel_init+0x21/0x1e0 [ 4.284623][ T1] ? __pfx_kernel_init+0x10/0x10 [ 4.285469][ T1] ret_from_fork+0x730/0xd60 [ 4.286179][ T1] ? __pfx_ret_from_fork+0x10/0x10 [ 4.286964][ T1] ? __switch_to+0x800/0x10f0 [ 4.288061][ T1] ? __pfx_kernel_init+0x10/0x10 [ 4.288883][ T1] ret_from_fork_asm+0x1a/0x30 [ 4.289745][ T1] </TASK> [ 4.290229][ T1] Kernel panic - not syncing: kernel: panic_on_warn set ... [ 4.291328][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) [ 4.292619][ T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026 [ 4.294006][ T1] Call Trace: [ 4.294490][ T1] <TASK> [ 4.294982][ T1] dump_stack_lvl+0x100/0x190 [ 4.295673][ T1] vpanic+0x553/0x970 [ 4.296729][ T1] ? __pfx_vpanic+0x10/0x10 [ 4.297560][ T1] panic+0xd1/0xe0 [ 4.297698][ T1] ? __pfx_panic+0x10/0x10 [ 4.297698][ T1] check_panic_on_warn.cold+0x19/0x34 [ 4.297698][ T1] ? drm_mode_config_validate+0xfb4/0x1be0 [ 4.297698][ T1] __warn.cold+0x191/0x318 [ 4.297698][ T1] __report_bug+0x30f/0x440 [ 4.297698][ T1] ? drm_mode_config_validate+0xfb4/0x1be0 [ 4.297698][ T1] ? __pfx___report_bug+0x10/0x10 [ 4.297698][ T1] ? reacquire_held_locks+0xdd/0x1f0 [ 4.297698][ T1] report_bug_entry+0xe2/0x290 [ 4.297698][ T1] ? drm_mode_config_validate+0xfbb/0x1be0 [ 4.297698][ T1] handle_bug+0x1cd/0x2a0 [ 4.297698][ T1] exc_invalid_op+0x17/0x50 [ 4.297698][ T1] asm_exc_invalid_op+0x1a/0x20 [ 4.297698][ T1] RIP: 0010:drm_mode_config_validate+0xfbb/0x1be0 [ 4.297698][ T1] Code: 00 49 8b 57 18 48 89 f8 48 c1 e8 03 0f b6 04 28 84 c0 74 08 3c 03 0f 8e 00 0b 00 00 48 8d 3d 5c 1f 7e 0b 41 8b b7 c8 00 00 00 <67> 48 0f b9 3a e9 fa fd ff ff 48 8b 5c 24 20 e8 d1 aa 39 fc 48 8d [ 4.297698][ T1] RSP: 0000:ffffc90000067c18 EFLAGS: 00010246 [ 4.297698][ T1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 4.297698][ T1] RDX: ffff88802708ff80 RSI: 0000000000000023 RDI: ffffffff91504ba0 [ 4.297698][ T1] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000 [ 4.297698][ T1] R10: 0000000000000001 R11: 0000000000000000 R12: ffffed1004ea1e23 [ 4.297698][ T1] R13: ffffed1004ea1e24 R14: 0000000000000001 R15: ffff88802750f028 [ 4.297698][ T1] ? drm_mode_config_validate+0xf76/0x1be0 [ 4.297698][ T1] drm_dev_register+0x56e/0x7b0 [ 4.297698][ T1] vkms_create+0x491/0x5b0 [ 4.297698][ T1] ? __pfx_vkms_init+0x10/0x10 [ 4.297698][ T1] vkms_init+0x98/0xe0 [ 4.297698][ T1] do_one_initcall+0x11c/0x6f0 [ 4.297698][ T1] ? __pfx_do_one_initcall+0x10/0x10 [ 4.297698][ T1] ? kernel_init_freeable+0x4ca/0x7b0 [ 4.297698][ T1] kernel_init_freeable+0x6ea/0x7b0 [ 4.297698][ T1] ? __pfx_kernel_init+0x10/0x10 [ 4.297698][ T1] kernel_init+0x21/0x1e0 [ 4.297698][ T1] ? __pfx_kernel_init+0x10/0x10 [ 4.297698][ T1] ret_from_fork+0x730/0xd60 [ 4.297698][ T1] ? __pfx_ret_from_fork+0x10/0x10 [ 4.297698][ T1] ? __switch_to+0x800/0x10f0 [ 4.297698][ T1] ? __pfx_kernel_init+0x10/0x10 [ 4.297698][ T1] ret_from_fork_asm+0x1a/0x30 [ 4.297698][ T1] </TASK> [ 4.297698][ T1] Kernel Offset: disabled [ 4.297698][ T1] Rebooting in 86400 seconds.. syzkaller build log: go env (err=<nil>) AR='ar' CC='gcc' CGO_CFLAGS='-O2 -g' CGO_CPPFLAGS='' CGO_CXXFLAGS='-O2 -g' CGO_ENABLED='1' CGO_FFLAGS='-O2 -g' CGO_LDFLAGS='-O2 -g' CXX='g++' GCCGO='gccgo' GO111MODULE='auto' GOAMD64='v1' GOARCH='amd64' GOAUTH='netrc' GOBIN='' GOCACHE='/syzkaller/.cache/go-build' GOCACHEPROG='' GODEBUG='' GOENV='/syzkaller/.config/go/env' GOEXE='' GOEXPERIMENT='' GOFIPS140='off' GOFLAGS='' GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build1798266567=/tmp/go-build -gno-record-gcc-switches' GOHOSTARCH='amd64' GOHOSTOS='linux' GOINSECURE='' GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod' GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod' GONOPROXY='' GONOSUMDB='' GOOS='linux' GOPATH='/syzkaller/jobs-2/linux/gopath' GOPRIVATE='' GOPROXY='https://proxy.golang.org,direct' GOROOT='/usr/local/go' GOSUMDB='sum.golang.org' GOTELEMETRY='local' GOTELEMETRYDIR='/syzkaller/.config/go/telemetry' GOTMPDIR='' GOTOOLCHAIN='auto' GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64' GOVCS='' GOVERSION='go1.26.0' GOWORK='' PKG_CONFIG='pkg-config' git status (err=<nil>) HEAD detached at 4cb2b096987 nothing to commit, working tree clean tput: No value for $TERM and no -T specified tput: No value for $TERM and no -T specified Makefile:31: run command via tools/syz-env for best compatibility, see: Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env go list -f '{{.Stale}}' -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=4cb2b096987c8122dc6b37eb51200b1ca7991e0f -X github.com/google/syzkaller/prog.gitRevisionDate=20260727-130118" ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=4cb2b096987c8122dc6b37eb51200b1ca7991e0f -X github.com/google/syzkaller/prog.gitRevisionDate=20260727-130118" ./sys/syz-sysgen make .descriptions tput: No value for $TERM and no -T specified tput: No value for $TERM and no -T specified Makefile:31: run command via tools/syz-env for best compatibility, see: Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env bin/syz-sysgen touch .descriptions GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=4cb2b096987c8122dc6b37eb51200b1ca7991e0f -X github.com/google/syzkaller/prog.gitRevisionDate=20260727-130118" -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog mkdir -p ./bin/linux_amd64 g++ -o ./bin/linux_amd64/syz-executor executor/executor.cc \ -m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include -DGOOS_linux=1 -DGOARCH_amd64=1 \ -DHOSTGOOS_linux=1 -DGIT_REVISION=\"4cb2b096987c8122dc6b37eb51200b1ca7991e0f\" /usr/bin/ld: /tmp/ccZHlTeq.o: in function `Connection::Connect(char const*, char const*)': executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x386): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking ./tools/check-syzos.sh 2>/dev/null Error text is too large and was truncated, full error text is at: https://syzkaller.appspot.com/x/error.txt?x=14ce4349580000 Tested on: commit: a8455260 ipvlan: unregister upper devices outside pnod.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git kernel config: https://syzkaller.appspot.com/x/.config?x=9cc692b98d9b4fdb dashboard link: https://syzkaller.appspot.com/bug?extid=2642f347f7309b4880dc compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 patch: https://syzkaller.appspot.com/x/patch.diff?x=11aef379580000 ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [syzbot] [mm?] INFO: rcu detected stall in exit_to_user_mode_loop 2025-07-28 21:30 ` syzbot 2026-08-31 8:41 ` Junjie Cao @ 2026-09-01 1:43 ` Junjie Cao 2026-09-01 8:22 ` syzbot 1 sibling, 1 reply; 6+ messages in thread From: Junjie Cao @ 2026-09-01 1:43 UTC (permalink / raw) To: syzbot+2642f347f7309b4880dc Cc: akpm, cgroups, hannes, jackmanb, linux-kernel, linux-mm, mhocko, mhocko, muchun.song, netdev, roman.gushchin, shakeel.butt, surenb, syzkaller-bugs, vbabka, ziy, hdanton, davem, edumazet, kuba, pabeni, horms, jhs, jiri, vinicius.gomes #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git abdf623ddb75b24659018d3952d8f61937306ae5 diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c index 39ac5b97aa3a..901dfd2484e1 100644 --- a/net/sched/sch_taprio.c +++ b/net/sched/sch_taprio.c @@ -83,6 +83,10 @@ struct sched_gate_list { s64 cycle_time; s64 cycle_time_extension; s64 base_time; + /* min(cycle_time, sum of intervals): the software schedule restarts + * the list after the last entry even when cycle_time is not up yet. + */ + s64 period; }; struct taprio_sched { @@ -871,12 +875,13 @@ static struct sk_buff *taprio_dequeue(struct Qdisc *sch) } static bool should_restart_cycle(const struct sched_gate_list *oper, - const struct sched_entry *entry) + const struct sched_entry *entry, + ktime_t end_time) { if (list_is_last(&entry->list, &oper->entries)) return true; - if (ktime_compare(entry->end_time, oper->cycle_end_time) == 0) + if (ktime_compare(end_time, oper->cycle_end_time) == 0) return true; return false; @@ -925,8 +930,9 @@ static enum hrtimer_restart advance_sched(struct hrtimer *timer) int num_tc = netdev_get_num_tc(dev); struct sched_entry *entry, *next; struct Qdisc *sch = q->root; - ktime_t end_time; - int tc; + ktime_t end_time, next_start, now; + int budget, tc; + s64 behind; spin_lock(&q->current_entry_lock); entry = rcu_dereference_protected(q->current_entry, @@ -952,23 +958,49 @@ static enum hrtimer_restart advance_sched(struct hrtimer *timer) goto first_run; } - if (should_restart_cycle(oper, entry)) { - next = list_first_entry(&oper->entries, struct sched_entry, - list); - oper->cycle_end_time = ktime_add_ns(oper->cycle_end_time, - oper->cycle_time); - } else { - next = list_next_entry(entry, list); + now = hrtimer_cb_get_time(timer); + end_time = entry->end_time; + behind = ktime_sub(now, end_time); + + /* Behind, e.g. delayed timer or stepped clock: skip whole periods + * arithmetically and walk at most one more to the entry covering + * now, instead of replaying the backlog one expiry at a time. The + * cap bounds the walk; a leftover is picked up by the next expiry. + */ + if (unlikely(behind >= oper->period)) { + s64 jump = div64_s64(behind, oper->period) * oper->period; + + end_time = ktime_add_ns(end_time, jump); + oper->cycle_end_time = ktime_add_ns(oper->cycle_end_time, jump); } - end_time = ktime_add_ns(entry->end_time, next->interval); - end_time = min_t(ktime_t, end_time, oper->cycle_end_time); + budget = 2 * oper->num_entries; + do { + if (should_restart_cycle(oper, entry, end_time)) { + next = list_first_entry(&oper->entries, + struct sched_entry, list); + oper->cycle_end_time = ktime_add_ns(oper->cycle_end_time, + oper->period); + } else { + next = list_next_entry(entry, list); + } + + next_start = end_time; + end_time = ktime_add_ns(next_start, next->interval); + end_time = min_t(ktime_t, end_time, oper->cycle_end_time); + entry = next; + } while (unlikely(ktime_compare(end_time, now) <= 0) && budget--); + /* next can be the entry already published as q->current_entry (a + * single-entry schedule, or a catch-up of whole periods), so the + * close times and budgets below are rewritten in place while + * taprio_dequeue_from_txq() may be reading them. + */ for (tc = 0; tc < num_tc; tc++) { if (next->gate_duration[tc] == oper->cycle_time) next->gate_close_time[tc] = KTIME_MAX; else - next->gate_close_time[tc] = ktime_add_ns(entry->end_time, + next->gate_close_time[tc] = ktime_add_ns(next_start, next->gate_duration[tc]); } @@ -1130,6 +1162,8 @@ static int parse_taprio_schedule(struct taprio_sched *q, struct nlattr **tb, struct sched_gate_list *new, struct netlink_ext_ack *extack) { + struct sched_entry *entry; + ktime_t cycle = 0; int err = 0; if (tb[TCA_TAPRIO_ATTR_SCHED_SINGLE_ENTRY]) { @@ -1152,13 +1186,10 @@ static int parse_taprio_schedule(struct taprio_sched *q, struct nlattr **tb, if (err < 0) return err; - if (!new->cycle_time) { - struct sched_entry *entry; - ktime_t cycle = 0; - - list_for_each_entry(entry, &new->entries, list) - cycle = ktime_add_ns(cycle, entry->interval); + list_for_each_entry(entry, &new->entries, list) + cycle = ktime_add_ns(cycle, entry->interval); + if (!new->cycle_time) { if (cycle < 0 || cycle > INT_MAX) { NL_SET_ERR_MSG(extack, "'cycle_time' is too big"); return -EINVAL; @@ -1172,6 +1203,7 @@ static int parse_taprio_schedule(struct taprio_sched *q, struct nlattr **tb, return -EINVAL; } + new->period = min(new->cycle_time, cycle); taprio_calculate_gate_durations(q, new); return 0; ^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [syzbot] [mm?] INFO: rcu detected stall in exit_to_user_mode_loop 2026-09-01 1:43 ` Junjie Cao @ 2026-09-01 8:22 ` syzbot 0 siblings, 0 replies; 6+ messages in thread From: syzbot @ 2026-09-01 8:22 UTC (permalink / raw) To: akpm, cgroups, davem, edumazet, hannes, hdanton, horms, jackmanb, jhs, jiri, junjie.cao, kuba, linux-kernel, linux-mm, mhocko, mhocko, muchun.song, netdev, pabeni, roman.gushchin, shakeel.butt, surenb, syzkaller-bugs, vbabka, vinicius.gomes, ziy Hello, syzbot has tested the proposed patch and the reproducer did not trigger any issue: Reported-by: syzbot+2642f347f7309b4880dc@syzkaller.appspotmail.com Tested-by: syzbot+2642f347f7309b4880dc@syzkaller.appspotmail.com Tested on: commit: abdf623d Merge tag 'wq-for-7.3-rc1-fixes' of git://git.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=123d1379580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9cc692b98d9b4fdb dashboard link: https://syzkaller.appspot.com/bug?extid=2642f347f7309b4880dc compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 patch: https://syzkaller.appspot.com/x/patch.diff?x=16f7eb79580000 Note: testing is done by a robot and is best-effort only. ^ permalink raw reply [flat|nested] 6+ messages in thread
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2025-07-12 0:18 ` [syzbot] [mm?] INFO: rcu detected stall in exit_to_user_mode_loop syzbot
2025-07-28 21:30 ` syzbot
2026-08-31 8:41 ` Junjie Cao
2026-08-31 11:12 ` syzbot
2026-09-01 1:43 ` Junjie Cao
2026-09-01 8:22 ` syzbot
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