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k21-20020a0566022d9500b007deda38b7dfmr16771iow.0.1714416390892; Mon, 29 Apr 2024 11:46:30 -0700 (PDT) Date: Mon, 29 Apr 2024 11:46:30 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000fa00a1061740ab6d@google.com> Subject: [syzbot] [sound?] INFO: rcu detected stall in snd_timer_user_release (3) From: syzbot To: linux-kernel@vger.kernel.org, linux-sound@vger.kernel.org, perex@perex.cz, syzkaller-bugs@googlegroups.com, tiwai@suse.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: e88c4cfcb7b8 Merge tag 'for-6.9-rc5-tag' of git://git.kern.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1343b727180000 kernel config: https://syzkaller.appspot.com/x/.config?x=98d5a8e00ed1044a dashboard link: https://syzkaller.appspot.com/bug?extid=43120c2af6ca2938cc38 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15aef608980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1039c208980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f00739ef493d/disk-e88c4cfc.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e5ab311a2b65/vmlinux-e88c4cfc.xz kernel image: https://storage.googleapis.com/syzbot-assets/0d097344a5b6/bzImage-e88c4cfc.xz Bisection is inconclusive: the issue happens on the oldest tested release. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12b6e6d8980000 final oops: https://syzkaller.appspot.com/x/report.txt?x=11b6e6d8980000 console output: https://syzkaller.appspot.com/x/log.txt?x=16b6e6d8980000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+43120c2af6ca2938cc38@syzkaller.appspotmail.com rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 GPs behind) idle=477c/1/0x4000000000000000 softirq=6170/6171 fqs=0 rcu: (detected by 0, t=10502 jiffies, g=7293, q=28 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 5111 Comm: syz-executor278 Not tainted 6.9.0-rc5-syzkaller-00042-ge88c4cfcb7b8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:get_bucket lib/debugobjects.c:492 [inline] RIP: 0010:debug_object_activate+0x13a/0x510 lib/debugobjects.c:706 Code: 8b 43 fd 48 8b 44 24 18 48 89 84 24 80 00 00 00 45 31 e4 80 3d aa 57 f2 0a 00 0f 85 b7 02 00 00 e8 eb 03 00 00 4c 89 7c 24 10 <49> c1 ef 0c 48 b9 eb 83 b5 80 46 86 c8 61 49 0f af cf 48 c1 e9 2f RSP: 0018:ffffc90000a08c00 EFLAGS: 00000046 RAX: a301fc934e8fa400 RBX: ffffc90000a08c70 RCX: ffffc90000a08903 RDX: 0000000000000003 RSI: ffffffff8bcaca20 RDI: ffffffff8c1f9760 RBP: ffffc90000a08d18 R08: ffffffff8fa8fdaf R09: 1ffffffff1f51fb5 R10: dffffc0000000000 R11: fffffbfff1f51fb6 R12: 0000000000000000 R13: 1ffff92000141188 R14: dffffc0000000000 R15: ffff88801aadbc88 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2070b46d33 CR3: 000000000e134000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: debug_hrtimer_activate kernel/time/hrtimer.c:423 [inline] debug_activate kernel/time/hrtimer.c:478 [inline] enqueue_hrtimer+0x30/0x3c0 kernel/time/hrtimer.c:1090 __run_hrtimer kernel/time/hrtimer.c:1709 [inline] __hrtimer_run_queues+0x6d5/0xd50 kernel/time/hrtimer.c:1756 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1818 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194 Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 2e bb 6f f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 b3 fe da f5 65 8b 05 24 2b 79 74 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc900022ef940 EFLAGS: 00000206 RAX: a301fc934e8fa400 RBX: 1ffff9200045df2c RCX: ffffffff8172edda RDX: dffffc0000000000 RSI: ffffffff8bcab8a0 RDI: 0000000000000001 RBP: ffffc900022ef9d0 R08: ffffffff92f34587 R09: 1ffffffff25e68b0 R10: dffffc0000000000 R11: fffffbfff25e68b1 R12: dffffc0000000000 R13: 1ffff9200045df28 R14: ffffc900022ef960 R15: 0000000000000246 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] class_spinlock_irqsave_destructor include/linux/spinlock.h:574 [inline] snd_timer_stop1+0x7e6/0x950 sound/core/timer.c:634 snd_timer_stop sound/core/timer.c:679 [inline] snd_timer_close_locked+0x223/0x8d0 sound/core/timer.c:423 snd_timer_close sound/core/timer.c:464 [inline] snd_timer_user_release+0x138/0x2e0 sound/core/timer.c:1468 __fput+0x429/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa1b/0x27e0 kernel/exit.c:878 do_group_exit+0x207/0x2c0 kernel/exit.c:1027 __do_sys_exit_group kernel/exit.c:1038 [inline] __se_sys_exit_group kernel/exit.c:1036 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2070b46db9 Code: Unable to access opcode bytes at 0x7f2070b46d8f. RSP: 002b:00007ffdfb750b08 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2070b46db9 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007f2070bc12b0 R08: ffffffffffffffb8 R09: 00000000000000a0 R10: 00000000000000a0 R11: 0000000000000246 R12: 00007f2070bc12b0 R13: 0000000000000000 R14: 00007f2070bc1d20 R15: 00007f2070b17f50 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.845 msecs rcu: rcu_preempt kthread starved for 10502 jiffies! g7293 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:23704 pid:16 tgid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5409 [inline] __schedule+0x17e8/0x4a50 kernel/sched/core.c:6746 __schedule_loop kernel/sched/core.c:6823 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6838 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2582 rcu_gp_fqs_loop+0x2df/0x1370 kernel/rcu/tree.c:1663 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1862 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 PID: 1106 Comm: kworker/u8:7 Not tainted 6.9.0-rc5-syzkaller-00042-ge88c4cfcb7b8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:311 [inline] RIP: 0010:smp_call_function_many_cond+0x1894/0x2a00 kernel/smp.c:855 Code: 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 15 db 0b 00 41 83 e4 01 49 bc 00 00 00 00 00 fc ff df 75 07 e8 c0 d6 0b 00 eb 38 f3 90 <42> 0f b6 04 23 84 c0 75 11 41 f7 45 00 01 00 00 00 74 1e e8 a4 d6 RSP: 0018:ffffc90004d676e0 EFLAGS: 00000293 RAX: ffffffff818a2abc RBX: 1ffff110172a8869 RCX: ffff888022bb9e00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90004d678e0 R08: ffffffff818a2a8b R09: 1ffffffff25e68a0 R10: dffffc0000000000 R11: fffffbfff25e68a1 R12: dffffc0000000000 R13: ffff8880b9544348 R14: ffff8880b943f7c0 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2070b9101d CR3: 000000000e134000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1023 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2086 [inline] text_poke_bp_batch+0x352/0xb30 arch/x86/kernel/alternative.c:2296 text_poke_flush arch/x86/kernel/alternative.c:2487 [inline] text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2494 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:205 static_key_enable+0x1a/0x20 kernel/jump_label.c:218 toggle_allocation_gate+0xb5/0x250 mm/kfence/core.c:826 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa10/0x17c0 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup