================================ WARNING: inconsistent lock state 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. kworker/1:0H/25 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff888029882948 (&timer->lock){?.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff888029882948 (&timer->lock){?.+.}-{2:2}, at: class_spinlock_constructor include/linux/spinlock.h:561 [inline] ffff888029882948 (&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_delete+0x45/0x60 sound/core/seq/seq_queue.c:188 snd_seq_kernel_client_ctl+0x107/0x1c0 sound/core/seq/seq_clientmgr.c:2526 delete_seq_queue.isra.0+0xc8/0x150 sound/core/seq/oss/seq_oss_init.c:371 odev_release+0x52/0x80 sound/core/seq/oss/seq_oss.c:144 __fput+0x270/0xb80 fs/file_table.c:422 __fput_sync+0x47/0x50 fs/file_table.c:507 __do_sys_close fs/open.c:1556 [inline] __se_sys_close fs/open.c:1541 [inline] __x64_sys_close+0x86/0x100 fs/open.c:1541 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: 5618 hardirqs last enabled at (5617): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (5617): [] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:194 hardirqs last disabled at (5618): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1043 softirqs last enabled at (4200): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (4200): [] __do_softirq+0x596/0x8de kernel/softirq.c:583 softirqs last disabled at (4175): [] invoke_softirq kernel/softirq.c:428 [inline] softirqs last disabled at (4175): [] __irq_exit_rcu kernel/softirq.c:633 [inline] softirqs last disabled at (4175): [] 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 *** 3 locks held by kworker/1:0H/25: #0: ffff888015078d48 ((wq_completion)events_highpri){+.+.}-{0:0}, at: process_one_work+0x1296/0x1a60 kernel/workqueue.c:3229 #1: ffffc900001f7d80 ((work_completion)(&vmidi->output_work)){+.+.}-{0:0}, at: process_one_work+0x906/0x1a60 kernel/workqueue.c:3230 #2: ffff888029c408f0 (&grp->list_mutex/1){.+.+}-{3:3}, at: __deliver_to_subscribers+0x32d/0x4d0 sound/core/seq/seq_clientmgr.c:734 stack backtrace: CPU: 1 PID: 25 Comm: kworker/1:0H Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: events_highpri snd_vmidi_output_work 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_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x42/0x80 kernel/locking/spinlock.c:194 Code: 95 f6 48 89 df e8 0e bb 95 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 bf 01 00 00 00 e8 95 08 87 f6 65 8b 05 e6 d0 2d 75 <85> c0 74 16 5b 5d c3 cc cc cc cc e8 4e 05 be f6 9c 58 f6 c4 02 75 RSP: 0018:ffffc900001f7808 EFLAGS: 00000297 RAX: 0000000080000000 RBX: ffffffff8f1dd300 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff8b0cb740 RDI: 0000000000000001 RBP: 0000000000000293 R08: 0000000000000001 R09: fffffbfff27b4e40 R10: ffffffff93da7207 R11: 0000000000000003 R12: ffffffff949bc368 R13: 0000000000000005 R14: dffffc0000000000 R15: 0000000000000000 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] find_slot+0x15a/0x1d0 sound/core/seq/oss/seq_oss_midi.c:119 snd_seq_oss_midi_input+0x10b/0xa20 sound/core/seq/oss/seq_oss_midi.c:528 snd_seq_oss_event_input+0x182/0x250 sound/core/seq/oss/seq_oss_event.c:429 __snd_seq_deliver_single_event sound/core/seq/seq_clientmgr.c:638 [inline] __snd_seq_deliver_single_event+0x124/0x1c0 sound/core/seq/seq_clientmgr.c:625 snd_seq_deliver_single_event.constprop.0+0x5e6/0x6e0 sound/core/seq/seq_clientmgr.c:695 __deliver_to_subscribers+0x166/0x4d0 sound/core/seq/seq_clientmgr.c:744 deliver_to_subscribers sound/core/seq/seq_clientmgr.c:773 [inline] snd_seq_deliver_event+0x17b/0x4b0 sound/core/seq/seq_clientmgr.c:816 snd_seq_kernel_client_dispatch+0x14d/0x180 sound/core/seq/seq_clientmgr.c:2496 snd_vmidi_output_work+0x1d2/0x390 sound/core/seq/seq_virmidi.c:157 process_one_work+0x9a9/0x1a60 kernel/workqueue.c:3254 process_scheduled_works kernel/workqueue.c:3335 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 ---------------- Code disassembly (best guess): 0: 95 xchg %eax,%ebp 1: f6 48 89 df testb $0xdf,-0x77(%rax) 5: e8 0e bb 95 f6 call 0xf695bb18 a: f7 c5 00 02 00 00 test $0x200,%ebp 10: 75 23 jne 0x35 12: 9c pushf 13: 58 pop %rax 14: f6 c4 02 test $0x2,%ah 17: 75 37 jne 0x50 19: bf 01 00 00 00 mov $0x1,%edi 1e: e8 95 08 87 f6 call 0xf68708b8 23: 65 8b 05 e6 d0 2d 75 mov %gs:0x752dd0e6(%rip),%eax # 0x752dd110 * 2a: 85 c0 test %eax,%eax <-- trapping instruction 2c: 74 16 je 0x44 2e: 5b pop %rbx 2f: 5d pop %rbp 30: c3 ret 31: cc int3 32: cc int3 33: cc int3 34: cc int3 35: e8 4e 05 be f6 call 0xf6be0588 3a: 9c pushf 3b: 58 pop %rax 3c: f6 c4 02 test $0x2,%ah 3f: 75 .byte 0x75