================================ WARNING: inconsistent lock state 6.8.0-syzkaller-11409-gf6cef5f8c37f #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.0/6742 [HC0[0]:SC1[1]:HE0:SE0] takes: ffff0000129dc148 (&timer->lock){+.?.}-{2:2}, at: class_spinlock_irqsave_constructor include/linux/spinlock.h:574 [inline] ffff0000129dc148 (&timer->lock){+.?.}-{2:2}, at: snd_timer_interrupt.part.0+0x34/0x9e0 sound/core/timer.c:818 {SOFTIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x480/0x7c8 kernel/locking/lockdep.c:5719 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x48/0x60 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+0x54/0x924 sound/core/timer.c:412 snd_timer_close+0x9c/0xf8 sound/core/timer.c:464 snd_seq_timer_close+0x7c/0xcc sound/core/seq/seq_timer.c:302 queue_delete+0x50/0xac sound/core/seq/seq_queue.c:126 snd_seq_queue_delete+0x2c/0x4c sound/core/seq/seq_queue.c:188 snd_seq_ioctl_delete_queue+0x6c/0xa0 sound/core/seq/seq_clientmgr.c:1597 snd_seq_kernel_client_ctl+0xd4/0x1d8 sound/core/seq/seq_clientmgr.c:2526 delete_seq_queue.isra.0+0xb4/0x118 sound/core/seq/oss/seq_oss_init.c:371 snd_seq_oss_release+0x138/0x194 sound/core/seq/oss/seq_oss_init.c:416 odev_release+0x4c/0x78 sound/core/seq/oss/seq_oss.c:144 __fput+0x1a4/0x92c fs/file_table.c:422 __fput_sync+0x74/0x84 fs/file_table.c:507 __do_sys_close fs/open.c:1556 [inline] __se_sys_close fs/open.c:1541 [inline] __arm64_sys_close+0x6c/0xbc fs/open.c:1541 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:48 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:133 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x50/0x180 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 irq event stamp: 2043 hardirqs last enabled at (2042): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] hardirqs last enabled at (2042): [] _raw_spin_unlock_irq+0x30/0x8c kernel/locking/spinlock.c:202 hardirqs last disabled at (2043): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (2043): [] _raw_spin_lock_irqsave+0x7c/0x80 kernel/locking/spinlock.c:162 softirqs last enabled at (1912): [] fpsimd_restore_current_state+0x44/0xe4 arch/arm64/kernel/fpsimd.c:1784 softirqs last disabled at (2039): [] ____do_softirq+0x10/0x1c arch/arm64/kernel/irq.c:81 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&timer->lock); lock(&timer->lock); *** DEADLOCK *** 2 locks held by syz-executor.0/6742: #0: ffff8000879582a8 (register_mutex#4){+.+.}-{3:3}, at: odev_release+0x44/0x78 sound/core/seq/oss/seq_oss.c:143 #1: ffff800080007c10 ((&priv->tlist)){+.-.}-{0:0}, at: lockdep_copy_map include/linux/lockdep.h:31 [inline] #1: ffff800080007c10 ((&priv->tlist)){+.-.}-{0:0}, at: call_timer_fn+0xfc/0x788 kernel/time/timer.c:1782 stack backtrace: CPU: 0 PID: 6742 Comm: syz-executor.0 Not tainted 6.8.0-syzkaller-11409-gf6cef5f8c37f #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x9c/0x11c arch/arm64/kernel/stacktrace.c:317 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xa4/0xf4 lib/dump_stack.c:114 dump_stack+0x1c/0x28 lib/dump_stack.c:123 print_usage_bug.part.0+0x508/0x90c kernel/locking/lockdep.c:4001 print_usage_bug kernel/locking/lockdep.c:3971 [inline] valid_state kernel/locking/lockdep.c:4013 [inline] mark_lock_irq kernel/locking/lockdep.c:4222 [inline] mark_lock+0xf18/0x19b8 kernel/locking/lockdep.c:4678 mark_usage kernel/locking/lockdep.c:4567 [inline] __lock_acquire+0x794/0x6b7c kernel/locking/lockdep.c:5091 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x480/0x7c8 kernel/locking/lockdep.c:5719 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x58/0x80 kernel/locking/spinlock.c:162 class_spinlock_irqsave_constructor include/linux/spinlock.h:574 [inline] snd_timer_interrupt.part.0+0x34/0x9e0 sound/core/timer.c:818 snd_timer_interrupt sound/core/timer.c:813 [inline] snd_timer_s_function+0xf0/0x198 sound/core/timer.c:1107 call_timer_fn+0x1c8/0x788 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1843 [inline] __run_timers+0x6b4/0x958 kernel/time/timer.c:2408 __run_timer_base kernel/time/timer.c:2419 [inline] __run_timer_base kernel/time/timer.c:2412 [inline] run_timer_base+0x110/0x180 kernel/time/timer.c:2428 run_timer_softirq+0x1c/0x44 kernel/time/timer.c:2438 __do_softirq+0x2e4/0xd9c kernel/softirq.c:554 ____do_softirq+0x10/0x1c arch/arm64/kernel/irq.c:81 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:889 do_softirq_own_stack+0x1c/0x2c arch/arm64/kernel/irq.c:86 invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0x334/0x434 kernel/softirq.c:633 irq_exit_rcu+0x14/0x80 kernel/softirq.c:645 __el1_irq arch/arm64/kernel/entry-common.c:537 [inline] el1_interrupt+0x38/0x54 arch/arm64/kernel/entry-common.c:551 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:556 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:594 __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:176 [inline] arch_local_irq_restore arch/arm64/include/asm/irqflags.h:196 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock_irqrestore+0x40/0xac kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] get_mdev+0x84/0xd0 sound/core/seq/oss/seq_oss_midi.c:99 get_mididev sound/core/seq/oss/seq_oss_midi.c:309 [inline] snd_seq_oss_midi_open+0xe4/0x578 sound/core/seq/oss/seq_oss_midi.c:324 snd_seq_oss_synth_reset+0x418/0x960 sound/core/seq/oss/seq_oss_synth.c:407 snd_seq_oss_reset+0x6c/0x204 sound/core/seq/oss/seq_oss_init.c:430 snd_seq_oss_release+0x7c/0x194 sound/core/seq/oss/seq_oss_init.c:407 odev_release+0x4c/0x78 sound/core/seq/oss/seq_oss.c:144 __fput+0x1a4/0x92c fs/file_table.c:422 __fput_sync+0x74/0x84 fs/file_table.c:507 __do_sys_close fs/open.c:1556 [inline] __se_sys_close fs/open.c:1541 [inline] __arm64_sys_close+0x6c/0xbc fs/open.c:1541 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:48 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:133 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x50/0x180 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598