================================ WARNING: inconsistent lock state 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor.1/7606 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff88802957b948 (&timer->lock){?.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff88802957b948 (&timer->lock){?.+.}-{2:2}, at: class_spinlock_constructor include/linux/spinlock.h:561 [inline] ffff88802957b948 (&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: 2852 hardirqs last enabled at (2851): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (2851): [] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:194 hardirqs last disabled at (2852): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1043 softirqs last enabled at (2544): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (2544): [] __do_softirq+0x596/0x8de kernel/softirq.c:583 softirqs last disabled at (2447): [] invoke_softirq kernel/softirq.c:428 [inline] softirqs last disabled at (2447): [] __irq_exit_rcu kernel/softirq.c:633 [inline] softirqs last disabled at (2447): [] 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.1/7606: #0: ffffffff8f1daaa8 (register_mutex#4){+.+.}-{3:3}, at: odev_ioctl+0x75/0x120 sound/core/seq/oss/seq_oss.c:182 #1: ffff88802957c930 (&grp->list_lock){.+.+}-{2:2}, at: __deliver_to_subscribers+0xeb/0x4d0 sound/core/seq/seq_clientmgr.c:732 stack backtrace: CPU: 1 PID: 7606 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: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:lock_acquire+0x1f2/0x540 kernel/locking/lockdep.c:5722 Code: c1 05 ea 37 97 7e 83 f8 01 0f 85 c8 02 00 00 9c 58 f6 c4 02 0f 85 b3 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc90003b4f730 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff92000769ee8 RCX: 0000000000000001 RDX: 0000000000000001 RSI: ffffffff8b0cba40 RDI: ffffffff8b6e88a0 RBP: 0000000000000200 R08: 000000000020e148 R09: fffffbfff27e812d R10: ffffffff93f4096f R11: ffffffff93471628 R12: 0000000000000001 R13: 0000000000000000 R14: ffff88802957c930 R15: 0000000000000000 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228 __deliver_to_subscribers+0xeb/0x4d0 sound/core/seq/seq_clientmgr.c:732 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 queue_broadcast_event.isra.0+0x149/0x1b0 sound/core/seq/seq_queue.c:623 snd_seq_queue_process_event sound/core/seq/seq_queue.c:672 [inline] snd_seq_control_queue+0x1b3/0x9c0 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: 0033:0x7f259bc7de69 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:00007f259ca430c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f259bdabf80 RCX: 00007f259bc7de69 RDX: 0000000000000000 RSI: 0000000000005402 RDI: 0000000000000006 RBP: 00007f259bcca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f259bdabf80 R15: 00007fff40a0e048 TCP: request_sock_TCP: Possible SYN flooding on port [::ffff:172.20.20.170]:2. Sending cookies. ---------------- Code disassembly (best guess): 0: c1 05 ea 37 97 7e 83 roll $0x83,0x7e9737ea(%rip) # 0x7e9737f1 7: f8 clc 8: 01 0f add %ecx,(%rdi) a: 85 c8 test %ecx,%eax c: 02 00 add (%rax),%al e: 00 9c 58 f6 c4 02 0f add %bl,0xf02c4f6(%rax,%rbx,2) 15: 85 b3 02 00 00 48 test %esi,0x48000002(%rbx) 1b: 85 ed test %ebp,%ebp 1d: 74 01 je 0x20 1f: fb sti 20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 27: fc ff df * 2a: 48 01 c3 add %rax,%rbx <-- trapping instruction 2d: 48 c7 03 00 00 00 00 movq $0x0,(%rbx) 34: 48 c7 43 08 00 00 00 movq $0x0,0x8(%rbx) 3b: 00 3c: 48 rex.W 3d: 8b .byte 0x8b 3e: 84 .byte 0x84 3f: 24 .byte 0x24