vkms_vblank_simulate: vblank timer overrun ================================ WARNING: inconsistent lock state 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor.3/6685 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff88802977c948 (&timer->lock){?.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff88802977c948 (&timer->lock){?.+.}-{2:2}, at: class_spinlock_constructor include/linux/spinlock.h:561 [inline] ffff88802977c948 (&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 task_work_run+0x14e/0x250 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:108 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0x275/0x2a0 kernel/entry/common.c:212 do_syscall_64+0xe2/0x260 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6d/0x75 irq event stamp: 338 hardirqs last enabled at (337): [] irqentry_exit+0x3b/0x90 kernel/entry/common.c:351 hardirqs last disabled at (338): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1043 softirqs last enabled at (336): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (336): [] __do_softirq+0x596/0x8de kernel/softirq.c:583 softirqs last disabled at (313): [] invoke_softirq kernel/softirq.c:428 [inline] softirqs last disabled at (313): [] __irq_exit_rcu kernel/softirq.c:633 [inline] softirqs last disabled at (313): [] 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 syz-executor.3/6685: #0: ffffffff8f1daaa8 (register_mutex#4){+.+.}-{3:3}, at: odev_ioctl+0x75/0x120 sound/core/seq/oss/seq_oss.c:182 stack backtrace: CPU: 0 PID: 6685 Comm: syz-executor.3 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:check_preemption_disabled+0x16/0xe0 lib/smp_processor_id.c:16 Code: ff 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 54 55 53 48 83 ec 08 65 8b 1d 3d 76 31 75 65 8b 05 32 76 31 75 ff ff ff 7f 74 0f 48 83 c4 08 89 d8 5b 5d 41 5c c3 cc cc cc cc RSP: 0018:ffffc900038ef7c0 EFLAGS: 00000286 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1ffff9200071df12 RDX: 1ffff1100b3a5a18 RSI: ffffffff8b6e8820 RDI: ffffffff8b6e8860 RBP: ffffc900038ef978 R08: 0000000000000001 R09: fffffbfff27b4e40 R10: ffffffff93da7207 R11: 0000000000000002 R12: ffffffff8100850a R13: ffff888059d2bc00 R14: ffff888029123750 R15: 000000000003e680 __schedule+0xb0/0x5c70 kernel/sched/core.c:6625 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6915 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:12 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] class_spinlock_irqsave_destructor include/linux/spinlock.h:574 [inline] snd_seq_timer_start+0x200/0x2b0 sound/core/seq/seq_timer.c:372 snd_seq_queue_process_event sound/core/seq/seq_queue.c:638 [inline] snd_seq_control_queue+0x54e/0x9c0 sound/core/seq/seq_queue.c:699 __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 snd_seq_deliver_event+0x291/0x4b0 sound/core/seq/seq_clientmgr.c:818 snd_seq_kernel_client_dispatch+0x14d/0x180 sound/core/seq/seq_clientmgr.c:2496 send_timer_event.isra.0+0x12e/0x180 sound/core/seq/oss/seq_oss_timer.c:140 snd_seq_oss_timer_start+0x1dc/0x330 sound/core/seq/oss/seq_oss_timer.c:161 snd_seq_oss_timer_ioctl+0x3cc/0x620 sound/core/seq/oss/seq_oss_timer.c:237 snd_seq_oss_ioctl+0x595/0xda0 sound/core/seq/oss/seq_oss_ioctl.c:77 odev_ioctl+0x9a/0x120 sound/core/seq/oss/seq_oss.c:184 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl fs/ioctl.c:890 [inline] __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:890 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: 0033:0x7fb656c7de69 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb65792d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fb656dabf80 RCX: 00007fb656c7de69 RDX: 0000000000000000 RSI: 0000000000005402 RDI: 0000000000000003 RBP: 00007fb656cca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fb656dabf80 R15: 00007ffc6e87aef8 vkms_vblank_simulate: vblank timer overrun vkms_vblank_simulate: vblank timer overrun vkms_vblank_simulate: vblank timer overrun vkms_vblank_simulate: vblank timer overrun vkms_vblank_simulate: vblank timer overrun ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 0f 1f 00 nopl (%rax) 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 41 54 push %r12 15: 55 push %rbp 16: 53 push %rbx 17: 48 83 ec 08 sub $0x8,%rsp 1b: 65 8b 1d 3d 76 31 75 mov %gs:0x7531763d(%rip),%ebx # 0x7531765f 22: 65 8b 05 32 76 31 75 mov %gs:0x75317632(%rip),%eax # 0x7531765b * 29: a9 ff ff ff 7f test $0x7fffffff,%eax <-- trapping instruction 2e: 74 0f je 0x3f 30: 48 83 c4 08 add $0x8,%rsp 34: 89 d8 mov %ebx,%eax 36: 5b pop %rbx 37: 5d pop %rbp 38: 41 5c pop %r12 3a: c3 ret 3b: cc int3 3c: cc int3 3d: cc int3 3e: cc int3