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https://syzkaller.appspot.com/x/.config?x=142508fb116c212f > dashboard link: https://syzkaller.appspot.com/bug?extid=8785aaf121cfb2141e0d > compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=107a43bc580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/24fd400c6842/disk-be48bcf0.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/59146305635d/vmlinux-be48bcf0.xz > kernel image: https://storage.googleapis.com/syzbot-assets/b3e5f65cbcc8/bzImage-be48bcf0.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+8785aaf121cfb2141e0d@syzkaller.appspotmail.com > > rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: > rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6029/1:b..l P1208/1:b..l P6031/3:b..l P6030/1:b..l > rcu: (detected by 1, t=10502 jiffies, g=6285, q=421 ncpus=2) > task:dhcpcd state:R running task stack:28896 pid:6030 tgid:6030 ppid:5513 task_flags:0x400040 flags:0x00004002 > Call Trace: > > context_switch kernel/sched/core.c:5357 [inline] > __schedule+0x1190/0x5de0 kernel/sched/core.c:6961 > preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288 > irqentry_exit+0x36/0x90 kernel/entry/common.c:197 > asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707 > RIP: 0010:unwind_next_frame+0xfe7/0x20a0 arch/x86/kernel/unwind_orc.c:664 > Code: 85 80 0c 00 00 49 89 6d 40 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 56 10 00 00 <41> 39 5d 00 0f 84 10 06 00 00 bd 01 00 00 00 e9 de f3 ff ff 48 b8 > RSP: 0018:ffffc90003cdf6a8 EFLAGS: 00000246 > RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffc90003ce0000 > RDX: 1ffff9200079bee3 RSI: ffffc90003cdfa70 RDI: ffffc90003cdf758 > RBP: ffffc90003cdfae0 R08: 0000000000000001 R09: 0000000000000000 > R10: ffffc90003cdf718 R11: 00000000000121e6 R12: ffffc90003cdf768 > R13: ffffc90003cdf718 R14: ffffc90003cdfa80 R15: ffffc90003cdf74c > arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25 > stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 > kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 > kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:548 > slab_free_hook mm/slub.c:2378 [inline] > slab_free mm/slub.c:4680 [inline] > kmem_cache_free+0x15a/0x4d0 mm/slub.c:4782 > vms_complete_munmap_vmas+0x573/0x970 mm/vma.c:1293 > do_vmi_align_munmap+0x43b/0x7d0 mm/vma.c:1536 > do_vmi_munmap+0x204/0x3e0 mm/vma.c:1584 > __vm_munmap+0x19a/0x390 mm/vma.c:3155 > __do_sys_munmap mm/mmap.c:1080 [inline] > __se_sys_munmap mm/mmap.c:1077 [inline] > __x64_sys_munmap+0x59/0x80 mm/mmap.c:1077 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fb13ec2f2e7 > RSP: 002b:00007fffe10fae78 EFLAGS: 00000206 ORIG_RAX: 000000000000000b > RAX: ffffffffffffffda RBX: 0000562bd1443510 RCX: 00007fb13ec2f2e7 > RDX: 0000000000000002 RSI: 0000000000004028 RDI: 00007fb13ea1b000 > RBP: 00007fffe10faf80 R08: 0000562bd1432470 R09: 0000000000000001 > R10: 00007fffe10fadb0 R11: 0000000000000206 R12: 00007fffe10faea0 > R13: 00007fb13ec42000 R14: 0000562bd1443510 R15: 0000000000000000 > > task:syz-executor state:R running task stack:27632 pid:6031 tgid:6031 ppid:5870 task_flags:0x400000 flags:0x00004000 > Call Trace: > > context_switch kernel/sched/core.c:5357 [inline] > __schedule+0x1190/0x5de0 kernel/sched/core.c:6961 > preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:7145 > preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 > __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline] > _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186 > spin_unlock include/linux/spinlock.h:391 [inline] > filemap_map_pages+0xe15/0x1670 mm/filemap.c:3791 > do_fault_around mm/memory.c:5531 [inline] > do_read_fault mm/memory.c:5564 [inline] > do_fault mm/memory.c:5707 [inline] > do_pte_missing+0xe39/0x3ba0 mm/memory.c:4234 > handle_pte_fault mm/memory.c:6052 [inline] > __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195 > handle_mm_fault+0x589/0xd10 mm/memory.c:6364 > do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336 > handle_page_fault arch/x86/mm/fault.c:1476 [inline] > exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532 > asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 > RIP: 0033:0x7f54cd7177c7 > RSP: 002b:00007fffb79a5b40 EFLAGS: 00010246 > RAX: 00007f54ce525000 RBX: 0000000000000000 RCX: 0000000000000064 > RDX: 00007fffb79a5de9 RSI: 0000000000000002 RDI: 00007fffb79a5dd8 > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002 > R13: 00007fffb79a5c48 R14: 0000000000000000 R15: 0000000000000000 > > task:kworker/0:3 state:R running task stack:25368 pid:1208 tgid:1208 ppid:2 task_flags:0x4208060 flags:0x00004000 > Workqueue: events_power_efficient gc_worker > Call Trace: > > context_switch kernel/sched/core.c:5357 [inline] > __schedule+0x1190/0x5de0 kernel/sched/core.c:6961 > preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288 > irqentry_exit+0x36/0x90 kernel/entry/common.c:197 > asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707 > RIP: 0010:write_comp_data+0x0/0x90 kernel/kcov.c:240 > Code: 48 8b 05 db b4 1a 12 48 8b 80 30 16 00 00 e9 97 05 db 09 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <49> 89 d2 49 89 f8 49 89 f1 65 48 8b 15 a7 b4 1a 12 65 8b 05 b8 b4 > RSP: 0018:ffffc9000441fb50 EFLAGS: 00000293 > RAX: 0000000000000000 RBX: 0000000000040000 RCX: ffffffff89ba2a52 > RDX: 0000000000040000 RSI: 0000000000000433 RDI: 0000000000000004 > RBP: ffffffff9b2c41ec R08: 0000000000000004 R09: 0000000000000000 > R10: 0000000000000000 R11: ffffffff9b030610 R12: ffff888031800000 > R13: 0000000000000433 R14: dffffc0000000000 R15: 0000000000001770 > gc_worker+0x342/0x16e0 net/netfilter/nf_conntrack_core.c:1549 > process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3236 > process_scheduled_works kernel/workqueue.c:3319 [inline] > worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400 > kthread+0x3c5/0x780 kernel/kthread.c:463 > ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > task:dhcpcd state:R running task stack:26072 pid:6029 tgid:6029 ppid:5513 task_flags:0x400040 flags:0x00004002 > Call Trace: > > context_switch kernel/sched/core.c:5357 [inline] > __schedule+0x1190/0x5de0 kernel/sched/core.c:6961 > preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288 > irqentry_exit+0x36/0x90 kernel/entry/common.c:197 > asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 > RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:80 [inline] > RIP: 0010:__orc_find+0x7e/0xf0 arch/x86/kernel/unwind_orc.c:102 > Code: ea 3f 48 c1 fe 02 48 01 f2 48 d1 fa 48 8d 5c 95 00 48 89 da 48 c1 ea 03 0f b6 34 0a 48 89 da 83 e2 07 83 c2 03 40 38 f2 7c 05 <40> 84 f6 75 4b 48 63 13 48 01 da 49 39 d5 73 af 4c 8d 63 fc 49 39 > RSP: 0018:ffffc90003337648 EFLAGS: 00000202 > RAX: ffffffff914e0dd8 RBX: ffffffff90c5215c RCX: dffffc0000000000 > RDX: 0000000000000007 RSI: 0000000000000000 RDI: ffffffff90c52148 > RBP: ffffffff90c52148 R08: ffffffff914e0e1a R09: 0000000000000000 > R10: ffffc900033376f8 R11: 0000000000011271 R12: ffffffff90c52170 > R13: ffffffff82127173 R14: ffffffff90c52148 R15: ffffffff90c52148 > orc_find arch/x86/kernel/unwind_orc.c:227 [inline] > unwind_next_frame+0x2ec/0x20a0 arch/x86/kernel/unwind_orc.c:494 > arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25 > stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 > kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 > kasan_save_track+0x14/0x30 mm/kasan/common.c:68 > poison_kmalloc_redzone mm/kasan/common.c:388 [inline] > __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:405 > kmalloc_noprof include/linux/slab.h:905 [inline] > slab_free_hook mm/slub.c:2369 [inline] > slab_free mm/slub.c:4680 [inline] > kmem_cache_free+0x142/0x4d0 mm/slub.c:4782 > vms_complete_munmap_vmas+0x573/0x970 mm/vma.c:1293 > do_vmi_align_munmap+0x43b/0x7d0 mm/vma.c:1536 > do_vmi_munmap+0x204/0x3e0 mm/vma.c:1584 > __vm_munmap+0x19a/0x390 mm/vma.c:3155 > __do_sys_munmap mm/mmap.c:1080 [inline] > __se_sys_munmap mm/mmap.c:1077 [inline] > __x64_sys_munmap+0x59/0x80 mm/mmap.c:1077 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fb13ec2f2e7 > RSP: 002b:00007fffe10fae78 EFLAGS: 00000202 ORIG_RAX: 000000000000000b > RAX: ffffffffffffffda RBX: 0000562bd1443f00 RCX: 00007fb13ec2f2e7 > RDX: 0000000000000001 RSI: 000000000002f6d0 RDI: 00007fb13e9c1000 > RBP: 00007fffe10faf80 R08: 00000000000004f0 R09: 0000000000000002 > R10: 00007fffe10fadb0 R11: 0000000000000202 R12: 00007fffe10faec0 > R13: 00007fb13ec42000 R14: 0000562bd1443f00 R15: 0000000000000000 > > > > --- > 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. > > 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 Let's see if speeding up the debug helps. #syz test: --- a/mm/vma.c +++ b/mm/vma.c @@ -648,6 +648,7 @@ void validate_mm(struct mm_struct *mm) struct vm_area_struct *vma; VMA_ITERATOR(vmi, mm, 0); + return; mt_validate(&mm->mm_mt); for_each_vma(vmi, vma) { #ifdef CONFIG_DEBUG_VM_RB