================================ WARNING: inconsistent lock state 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.1/7211 [HC0[0]:SC1[1]:HE0:SE0] takes: ffff8880296ff148 (&timer->lock){+.?.}-{2:2} , at: class_spinlock_irqsave_constructor include/linux/spinlock.h:574 [inline] , at: snd_timer_interrupt.part.0+0x31/0xd80 sound/core/timer.c:818 {SOFTIRQ-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: 4695 hardirqs last enabled at (4694): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] hardirqs last enabled at (4694): [] _raw_spin_unlock_irq+0x23/0x50 kernel/locking/spinlock.c:202 hardirqs last disabled at (4695): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (4695): [] _raw_spin_lock_irqsave+0x52/0x60 kernel/locking/spinlock.c:162 softirqs last enabled at (3548): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (3548): [] __do_softirq+0x596/0x8de kernel/softirq.c:583 softirqs last disabled at (4685): [] invoke_softirq kernel/softirq.c:428 [inline] softirqs last disabled at (4685): [] __irq_exit_rcu kernel/softirq.c:633 [inline] softirqs last disabled at (4685): [] 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 *** 2 locks held by syz-executor.1/7211: #0: ffff8880248881a0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:108 [inline] #0: ffff8880248881a0 (&mm->mmap_lock){++++}-{3:3}, at: exit_mmap+0x203/0xb60 mm/mmap.c:3295 #1: ffffc90000007cb0 ((&priv->tlist)){+.-.}-{0:0}, at: call_timer_fn+0x11a/0x5b0 kernel/time/timer.c:1789 stack backtrace: CPU: 0 PID: 7211 Comm: syz-executor.1 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:4567 [inline] __lock_acquire+0x13d4/0x3b30 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_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 class_spinlock_irqsave_constructor include/linux/spinlock.h:574 [inline] snd_timer_interrupt.part.0+0x31/0xd80 sound/core/timer.c:818 snd_timer_interrupt sound/core/timer.c:1107 [inline] snd_timer_s_function+0x14f/0x200 sound/core/timer.c:1107 call_timer_fn+0x1a0/0x5b0 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1843 [inline] __run_timers+0x74b/0xab0 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+0x111/0x190 kernel/time/timer.c:2428 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2438 __do_softirq+0x218/0x8de kernel/softirq.c:554 invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:633 [inline] irq_exit_rcu+0xb9/0x120 kernel/softirq.c:645 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:poison_slab_object mm/kasan/common.c:222 [inline] RIP: 0010:__kasan_slab_free+0xda/0x1a0 mm/kasan/common.c:256 Code: f7 fe 41 0f b7 46 2a 48 89 de 48 29 d6 25 ff 7f 00 00 83 e8 01 0f af c1 48 01 c7 48 39 fe 48 0f 47 f7 48 89 ef e8 e6 cf f5 ff <48> 39 c3 0f 85 a3 00 00 00 f6 45 09 02 75 34 48 89 df e8 2f 2b 00 RSP: 0018:ffffc90004297940 EFLAGS: 00000293 RAX: ffff8880205081b0 RBX: ffff8880205081b0 RCX: 00000000000000d8 RDX: 0000000000000000 RSI: ffff8880205081b0 RDI: ffff888015eecc80 RBP: ffff888015eecc80 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: ffffffff814ed9de R14: ffffea0000814200 R15: 0000000000000000 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2106 [inline] slab_free mm/slub.c:4280 [inline] kmem_cache_free+0x12e/0x360 mm/slub.c:4344 vma_lock_free kernel/fork.c:453 [inline] __vm_area_free+0xee/0x140 kernel/fork.c:509 remove_vma+0x12b/0x180 mm/mmap.c:146 exit_mmap+0x4dd/0xb60 mm/mmap.c:3311 __mmput+0x12a/0x4d0 kernel/fork.c:1345 mmput+0x62/0x70 kernel/fork.c:1367 exit_mm kernel/exit.c:569 [inline] do_exit+0x999/0x2be0 kernel/exit.c:865 do_group_exit+0xd3/0x2a0 kernel/exit.c:1027 get_signal+0x2390/0x2760 kernel/signal.c:2907 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [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+0x14a/0x2a0 kernel/entry/common.c:212 do_syscall_64+0xe2/0x260 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f277bc7df27 Code: Unable to access opcode bytes at 0x7f277bc7defd. RSP: 002b:00007ffcef212fe8 EFLAGS: 00000206 ORIG_RAX: 000000000000000a RAX: 0000000000000000 RBX: 00007f277ca0c6c0 RCX: 00007f277bc7df27 RDX: 0000000000000003 RSI: 0000000000020000 RDI: 00007f277c9ed000 RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000021000 R11: 0000000000000206 R12: 00007ffcef213290 R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000 vkms_vblank_simulate: vblank timer overrun vkms_vblank_simulate: vblank timer overrun ---------------- Code disassembly (best guess): 0: f7 fe idiv %esi 2: 41 0f b7 46 2a movzwl 0x2a(%r14),%eax 7: 48 89 de mov %rbx,%rsi a: 48 29 d6 sub %rdx,%rsi d: 25 ff 7f 00 00 and $0x7fff,%eax 12: 83 e8 01 sub $0x1,%eax 15: 0f af c1 imul %ecx,%eax 18: 48 01 c7 add %rax,%rdi 1b: 48 39 fe cmp %rdi,%rsi 1e: 48 0f 47 f7 cmova %rdi,%rsi 22: 48 89 ef mov %rbp,%rdi 25: e8 e6 cf f5 ff call 0xfff5d010 * 2a: 48 39 c3 cmp %rax,%rbx <-- trapping instruction 2d: 0f 85 a3 00 00 00 jne 0xd6 33: f6 45 09 02 testb $0x2,0x9(%rbp) 37: 75 34 jne 0x6d 39: 48 89 df mov %rbx,%rdi 3c: e8 .byte 0xe8 3d: 2f (bad) 3e: 2b 00 sub (%rax),%eax