================================ WARNING: inconsistent lock state 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. udevd/9170 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff888025697948 (&timer->lock){?.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff888025697948 (&timer->lock){?.+.}-{2:2}, at: class_spinlock_constructor include/linux/spinlock.h:561 [inline] ffff888025697948 (&timer->lock){?.+.}-{2:2}, at: snd_hrtimer_callback+0x4d/0x420 sound/core/hrtimer.c:38 {HARDIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] class_spinlock_constructor include/linux/spinlock.h:561 [inline] snd_timer_close_locked+0x65/0xbd0 sound/core/timer.c:412 snd_timer_close+0x8b/0xf0 sound/core/timer.c:464 snd_seq_timer_close+0xa4/0x100 sound/core/seq/seq_timer.c:302 queue_delete+0x49/0xa0 sound/core/seq/seq_queue.c:126 snd_seq_queue_client_leave+0x37/0x1a0 sound/core/seq/seq_queue.c:543 seq_free_client1.part.0+0x10a/0x260 sound/core/seq/seq_clientmgr.c:285 seq_free_client1 sound/core/seq/seq_clientmgr.c:278 [inline] seq_free_client+0x74/0x170 sound/core/seq/seq_clientmgr.c:306 snd_seq_release+0x50/0xe0 sound/core/seq/seq_clientmgr.c:387 __fput+0x270/0xb80 fs/file_table.c:422 task_work_run+0x14e/0x250 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa7d/0x2be0 kernel/exit.c:878 do_group_exit+0xd3/0x2a0 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+0x3e/0x50 kernel/exit.c:1036 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 irq event stamp: 376072 hardirqs last enabled at (376071): [] __raw_write_unlock_irq include/linux/rwlock_api_smp.h:273 [inline] hardirqs last enabled at (376071): [] _raw_write_unlock_irq+0x23/0x50 kernel/locking/spinlock.c:358 hardirqs last disabled at (376072): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1043 softirqs last enabled at (375836): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (375836): [] __do_softirq+0x596/0x8de kernel/softirq.c:583 softirqs last disabled at (375739): [] invoke_softirq kernel/softirq.c:428 [inline] softirqs last disabled at (375739): [] __irq_exit_rcu kernel/softirq.c:633 [inline] softirqs last disabled at (375739): [] irq_exit_rcu+0xb9/0x120 kernel/softirq.c:645 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&timer->lock); lock(&timer->lock); *** DEADLOCK *** 1 lock held by udevd/9170: #0: ffff88801f09d468 (&ep->mtx){+.+.}-{3:3}, at: ep_send_events fs/eventpoll.c:1799 [inline] #0: ffff88801f09d468 (&ep->mtx){+.+.}-{3:3}, at: ep_poll fs/eventpoll.c:1969 [inline] #0: ffff88801f09d468 (&ep->mtx){+.+.}-{3:3}, at: do_epoll_wait+0xaba/0x1ae0 fs/eventpoll.c:2428 stack backtrace: CPU: 1 PID: 9170 Comm: udevd Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_usage_bug kernel/locking/lockdep.c:3971 [inline] valid_state kernel/locking/lockdep.c:4013 [inline] mark_lock_irq kernel/locking/lockdep.c:4216 [inline] mark_lock+0x923/0xc60 kernel/locking/lockdep.c:4678 mark_usage kernel/locking/lockdep.c:4564 [inline] __lock_acquire+0x1359/0x3b30 kernel/locking/lockdep.c:5091 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] class_spinlock_constructor include/linux/spinlock.h:561 [inline] snd_hrtimer_callback+0x4d/0x420 sound/core/hrtimer.c:38 __run_hrtimer kernel/time/hrtimer.c:1692 [inline] __hrtimer_run_queues+0x20c/0xc20 kernel/time/hrtimer.c:1756 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1818 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x10f/0x410 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_write_unlock_irq include/linux/rwlock_api_smp.h:274 [inline] RIP: 0010:_raw_write_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:358 Code: 90 f3 0f 1e fa 53 48 8b 74 24 08 48 89 fb 48 83 c7 18 e8 aa 37 95 f6 48 89 df e8 32 bd 95 f6 e8 7d fd bd f6 fb bf 01 00 00 00 a2 00 87 f6 65 8b 05 f3 c8 2d 75 85 c0 74 06 5b c3 cc cc cc cc RSP: 0018:ffffc9000304fc50 EFLAGS: 00000202 RAX: 000000000005bd07 RBX: ffff88801f09d540 RCX: 1ffffffff27bda34 RDX: 0000000000000000 RSI: ffffffff8b0cb740 RDI: 0000000000000001 RBP: 00007ffcb3ea9028 R08: 0000000000000001 R09: fffffbfff27b4e46 R10: ffffffff93da7237 R11: 0000000000000001 R12: 0000000000000001 R13: ffffed1003e13ab8 R14: ffff88801f09d400 R15: dffffc0000000000 ep_send_events fs/eventpoll.c:1800 [inline] ep_poll fs/eventpoll.c:1969 [inline] do_epoll_wait+0xac7/0x1ae0 fs/eventpoll.c:2428 __do_sys_epoll_wait fs/eventpoll.c:2440 [inline] __se_sys_epoll_wait fs/eventpoll.c:2435 [inline] __x64_sys_epoll_wait+0x194/0x290 fs/eventpoll.c:2435 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7fd35ab23457 Code: 73 01 c3 48 8b 0d d1 d9 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 e8 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 76 48 8b 15 a2 d9 0c 00 f7 d8 64 89 02 48 83 RSP: 002b:00007ffcb3ea8fb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd35ab23457 RDX: 0000000000000004 RSI: 00007ffcb3ea8ff8 RDI: 0000000000000004 RBP: 00005555b8246d20 R08: 0000000000000000 R09: f42c5623809bbee7 R10: 00000000ffffffff R11: 0000000000000246 R12: 00005555b8143e20 R13: 00007ffcb3ea8ff8 R14: 00000000ffffffff R15: 00005555b81252c0 ---------------- Code disassembly (best guess): 0: 90 nop 1: f3 0f 1e fa endbr64 5: 53 push %rbx 6: 48 8b 74 24 08 mov 0x8(%rsp),%rsi b: 48 89 fb mov %rdi,%rbx e: 48 83 c7 18 add $0x18,%rdi 12: e8 aa 37 95 f6 call 0xf69537c1 17: 48 89 df mov %rbx,%rdi 1a: e8 32 bd 95 f6 call 0xf695bd51 1f: e8 7d fd bd f6 call 0xf6bdfda1 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 a2 00 87 f6 call 0xf68700d1 <-- trapping instruction 2f: 65 8b 05 f3 c8 2d 75 mov %gs:0x752dc8f3(%rip),%eax # 0x752dc929 36: 85 c0 test %eax,%eax 38: 74 06 je 0x40 3a: 5b pop %rbx 3b: c3 ret 3c: cc int3 3d: cc int3 3e: cc int3 3f: cc int3