================================ WARNING: inconsistent lock state 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor.2/5688 [HC1[1]:SC1[1]:HE0:SE0] takes: ffff888029c55948 (&timer->lock){?.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff888029c55948 (&timer->lock){?.+.}-{2:2}, at: class_spinlock_constructor include/linux/spinlock.h:561 [inline] ffff888029c55948 (&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: 765 hardirqs last enabled at (764): [] load_balance+0x16d1/0x3500 kernel/sched/fair.c:11335 hardirqs last disabled at (765): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1043 softirqs last enabled at (712): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (712): [] __do_softirq+0x596/0x8de kernel/softirq.c:583 softirqs last disabled at (749): [] invoke_softirq kernel/softirq.c:428 [inline] softirqs last disabled at (749): [] __irq_exit_rcu kernel/softirq.c:633 [inline] softirqs last disabled at (749): [] 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.2/5688: #0: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #0: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #0: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rebalance_domains+0x117/0xee0 kernel/sched/fair.c:11690 stack backtrace: CPU: 0 PID: 5688 Comm: syz-executor.2 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+0x43/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:load_balance+0x10f0/0x3500 kernel/sched/fair.c:11337 Code: 89 ef e8 c3 f9 f9 ff 8b bc 24 b0 00 00 00 85 ff 0f 85 06 06 00 00 4d 85 e4 0f 85 e7 05 00 00 9c 58 f6 c4 02 0f 85 dd 0b 00 00 <8b> 9c 24 38 01 00 00 f6 c3 02 74 36 48 8b 44 24 58 83 e3 fd 89 9c RSP: 0018:ffffc90000007c18 EFLAGS: 00000246 RAX: 0000000000000006 RBX: ffff8880b943e680 RCX: 1ffffffff1f3c599 RDX: 0000000000000000 RSI: ffffffff8b0cb740 RDI: ffffffff8b6e88a0 RBP: ffffc90000007de8 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8f9e6f97 R11: ffff88801f7efcc8 R12: 0000000000000200 R13: ffff8880b953e680 R14: dffffc0000000000 R15: 0000000000003ff2 rebalance_domains+0x709/0xee0 kernel/sched/fair.c:11719 __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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194 Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 a6 3f 95 f6 48 89 df e8 0e bb 95 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 95 08 87 f6 65 8b 05 e6 d0 2d 75 85 c0 74 16 5b RSP: 0018:ffffc9000470f788 EFLAGS: 00000246 RAX: 0000000000000006 RBX: ffff88802d065a80 RCX: 1ffffffff1f3c599 RDX: 0000000000000000 RSI: ffffffff8b0cb740 RDI: ffffffff8b6e88a0 RBP: 0000000000000287 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8f9e6f97 R11: 0000000000000001 R12: ffff88802d065a80 R13: 0000000000000287 R14: ffff88802d065a50 R15: ffff88802de73600 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 old_event sound/core/seq/oss/seq_oss_event.c:113 [inline] snd_seq_oss_process_event+0x1eca/0x2550 sound/core/seq/oss/seq_oss_event.c:88 insert_queue sound/core/seq/oss/seq_oss_rw.c:167 [inline] snd_seq_oss_write+0x234/0x7b0 sound/core/seq/oss/seq_oss_rw.c:135 odev_write+0x57/0xa0 sound/core/seq/oss/seq_oss.c:168 vfs_write+0x298/0x1100 fs/read_write.c:588 ksys_write+0x12f/0x260 fs/read_write.c:643 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: 0033:0x7fd7fce7de69 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:00007fd7fdc930c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fd7fcfabf80 RCX: 00007fd7fce7de69 RDX: 000000000000010d RSI: 000000002001f180 RDI: 0000000000000007 RBP: 00007fd7fceca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fd7fcfabf80 R15: 00007fffca979d08 ---------------- Code disassembly (best guess): 0: 89 ef mov %ebp,%edi 2: e8 c3 f9 f9 ff call 0xfff9f9ca 7: 8b bc 24 b0 00 00 00 mov 0xb0(%rsp),%edi e: 85 ff test %edi,%edi 10: 0f 85 06 06 00 00 jne 0x61c 16: 4d 85 e4 test %r12,%r12 19: 0f 85 e7 05 00 00 jne 0x606 1f: 9c pushf 20: 58 pop %rax 21: f6 c4 02 test $0x2,%ah 24: 0f 85 dd 0b 00 00 jne 0xc07 * 2a: 8b 9c 24 38 01 00 00 mov 0x138(%rsp),%ebx <-- trapping instruction 31: f6 c3 02 test $0x2,%bl 34: 74 36 je 0x6c 36: 48 8b 44 24 58 mov 0x58(%rsp),%rax 3b: 83 e3 fd and $0xfffffffd,%ebx 3e: 89 .byte 0x89 3f: 9c pushf