================================ WARNING: inconsistent lock state 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. udevd/4513 [HC0[0]:SC1[1]:HE0:SE0] takes: ffff888029683948 (&timer->lock){+.?.}-{2:2}, at: class_spinlock_irqsave_constructor include/linux/spinlock.h:574 [inline] ffff888029683948 (&timer->lock){+.?.}-{2:2}, 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: 1773673 hardirqs last enabled at (1773672): [] irqentry_exit+0x3b/0x90 kernel/entry/common.c:351 hardirqs last disabled at (1773673): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (1773673): [] _raw_spin_lock_irqsave+0x52/0x60 kernel/locking/spinlock.c:162 softirqs last enabled at (1773644): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (1773644): [] __do_softirq+0x596/0x8de kernel/softirq.c:583 softirqs last disabled at (1773665): [] invoke_softirq kernel/softirq.c:428 [inline] softirqs last disabled at (1773665): [] __irq_exit_rcu kernel/softirq.c:633 [inline] softirqs last disabled at (1773665): [] 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 *** 4 locks held by udevd/4513: #0: ffffffff8d8b9030 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mmap kernel/fork.c:637 [inline] #0: ffffffff8d8b9030 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1687 [inline] #0: ffffffff8d8b9030 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm kernel/fork.c:1736 [inline] #0: ffffffff8d8b9030 (dup_mmap_sem){.+.+}-{0:0}, at: copy_process+0x67cb/0x9160 kernel/fork.c:2389 #1: ffff8880747e9e20 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:124 [inline] #1: ffff8880747e9e20 (&mm->mmap_lock){++++}-{3:3}, at: dup_mmap kernel/fork.c:638 [inline] #1: ffff8880747e9e20 (&mm->mmap_lock){++++}-{3:3}, at: dup_mm kernel/fork.c:1687 [inline] #1: ffff8880747e9e20 (&mm->mmap_lock){++++}-{3:3}, at: copy_mm kernel/fork.c:1736 [inline] #1: ffff8880747e9e20 (&mm->mmap_lock){++++}-{3:3}, at: copy_process+0x67f1/0x9160 kernel/fork.c:2389 #2: ffff88801cf6cda0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: mmap_write_lock_nested include/linux/mmap_lock.h:115 [inline] #2: ffff88801cf6cda0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mmap kernel/fork.c:647 [inline] #2: ffff88801cf6cda0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mm kernel/fork.c:1687 [inline] #2: ffff88801cf6cda0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: copy_mm kernel/fork.c:1736 [inline] #2: ffff88801cf6cda0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: copy_process+0x6851/0x9160 kernel/fork.c:2389 #3: ffffc90000007cb0 ((&priv->tlist)){+.-.}-{0:0}, at: call_timer_fn+0x11a/0x5b0 kernel/time/timer.c:1789 stack backtrace: CPU: 0 PID: 4513 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: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:on_stack arch/x86/include/asm/stacktrace.h:56 [inline] RIP: 0010:unwind_next_frame+0x11a1/0x23a0 arch/x86/kernel/unwind_orc.c:665 Code: 08 4c 39 e5 72 63 e8 5e 50 50 00 48 8d 7b 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 2b 10 00 00 <4c> 8b 6b 10 4c 39 ed 73 36 e8 31 50 50 00 4c 8d 75 08 4d 39 f4 73 RSP: 0018:ffffc900034af628 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffffc900034af6a8 RCX: ffffffff813ca7f6 RDX: 1ffff92000695ed7 RSI: ffffffff813ca852 RDI: ffffc900034af6b8 RBP: ffffc900034afcf8 R08: 0000000000000004 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000004 R12: ffffc900034a8000 R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000001 arch_stack_walk+0x100/0x170 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc+0x136/0x320 mm/slub.c:3852 vm_area_dup+0x21/0x2f0 kernel/fork.c:482 dup_mmap kernel/fork.c:697 [inline] dup_mm kernel/fork.c:1687 [inline] copy_mm kernel/fork.c:1736 [inline] copy_process+0x7b33/0x9160 kernel/fork.c:2389 kernel_clone+0xfd/0x940 kernel/fork.c:2796 __do_sys_clone+0xba/0x100 kernel/fork.c:2939 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: 0033:0x7f58a5977a12 Code: 41 5d 41 5e 41 5f c3 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 10 48 8b 15 e7 43 0f 00 f7 d8 64 89 02 48 83 RSP: 002b:00007ffea3efaa88 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 000055d0d77c0f01 RCX: 00007f58a5977a12 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000000 R08: 0000000000000000 R09: 000055d0d778b2c0 R10: 00007f58a58bbf50 R11: 0000000000000246 R12: 000055d0d77c4310 R13: 0000000000000000 R14: 0000000000000000 R15: 000055d0d778b2c0 ---------------- Code disassembly (best guess): 0: 08 4c 39 e5 or %cl,-0x1b(%rcx,%rdi,1) 4: 72 63 jb 0x69 6: e8 5e 50 50 00 call 0x505069 b: 48 8d 7b 10 lea 0x10(%rbx),%rdi f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 16: fc ff df 19: 48 89 fa mov %rdi,%rdx 1c: 48 c1 ea 03 shr $0x3,%rdx 20: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 24: 0f 85 2b 10 00 00 jne 0x1055 * 2a: 4c 8b 6b 10 mov 0x10(%rbx),%r13 <-- trapping instruction 2e: 4c 39 ed cmp %r13,%rbp 31: 73 36 jae 0x69 33: e8 31 50 50 00 call 0x505069 38: 4c 8d 75 08 lea 0x8(%rbp),%r14 3c: 4d 39 f4 cmp %r14,%r12 3f: 73 .byte 0x73