vkms_vblank_simulate: vblank timer overrun ================================ WARNING: inconsistent lock state 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor.2/5079 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff888029b97948 (&timer->lock){?.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff888029b97948 (&timer->lock){?.+.}-{2:2}, at: class_spinlock_constructor include/linux/spinlock.h:561 [inline] ffff888029b97948 (&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: 2024046 hardirqs last enabled at (2024045): [] seqcount_lockdep_reader_access include/linux/seqlock.h:74 [inline] hardirqs last enabled at (2024045): [] path_init+0x150c/0x1930 fs/namei.c:2408 hardirqs last disabled at (2024046): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1043 softirqs last enabled at (2024002): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (2024002): [] __do_softirq+0x596/0x8de kernel/softirq.c:583 softirqs last disabled at (2023987): [] invoke_softirq kernel/softirq.c:428 [inline] softirqs last disabled at (2023987): [] __irq_exit_rcu kernel/softirq.c:633 [inline] softirqs last disabled at (2023987): [] 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.2/5079: #0: ffffffff8e11e410 (tomoyo_ss){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:116 [inline] #0: ffffffff8e11e410 (tomoyo_ss){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:215 [inline] #0: ffffffff8e11e410 (tomoyo_ss){.+.+}-{0:0}, at: tomoyo_read_lock security/tomoyo/common.h:1108 [inline] #0: ffffffff8e11e410 (tomoyo_ss){.+.+}-{0:0}, at: tomoyo_check_open_permission+0x164/0x3b0 security/tomoyo/file.c:767 #1: ffffffff8d94a6a0 (mmu_notifier_invalidate_range_start){+.+.}-{0:0}, at: fs_reclaim_acquire mm/page_alloc.c:3709 [inline] #1: ffffffff8d94a6a0 (mmu_notifier_invalidate_range_start){+.+.}-{0:0}, at: fs_reclaim_acquire+0xae/0x150 mm/page_alloc.c:3700 stack backtrace: CPU: 1 PID: 5079 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+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:rcu_is_watching+0x80/0xc0 kernel/rcu/tree.c:701 Code: 89 da 48 c1 ea 03 0f b6 14 02 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 24 8b 03 c1 e8 02 83 e0 01 65 ff 0d 58 41 90 7e <74> 07 5b 5d c3 cc cc cc cc e8 b2 f2 8c ff 5b 5d c3 cc cc cc cc 48 RSP: 0018:ffffc900037ef650 EFLAGS: 00000286 RAX: 0000000000000001 RBX: ffff8880b9537ee8 RCX: ffffffff816b4309 RDX: 0000000000000000 RSI: ffffffff8b6e8820 RDI: ffffffff8d233b28 RBP: 0000000000000001 R08: 0000000000000000 R09: fffffbfff1f3cdf2 R10: ffffffff8f9e6f97 R11: 0000000000000001 R12: ffffffff8d94a6a0 R13: 0000000000000c40 R14: 000000000003d3cc R15: ffffffff843ae5c9 trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x4cc/0x6a0 kernel/locking/lockdep.c:5765 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slub.c:3746 [inline] slab_alloc_node mm/slub.c:3827 [inline] __do_kmalloc_node mm/slub.c:3965 [inline] __kmalloc+0xb5/0x440 mm/slub.c:3979 kmalloc include/linux/slab.h:632 [inline] tomoyo_realpath_from_path+0xb9/0x720 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x2a7/0x3b0 security/tomoyo/file.c:771 tomoyo_file_open+0x71/0x90 security/tomoyo/tomoyo.c:334 security_file_open+0x78/0x630 security/security.c:2955 do_dentry_open+0x583/0x18c0 fs/open.c:942 do_open fs/namei.c:3642 [inline] path_openat+0x1dfb/0x2990 fs/namei.c:3799 do_filp_open+0x1dc/0x430 fs/namei.c:3826 do_sys_openat2+0x17a/0x1e0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_openat fs/open.c:1437 [inline] __se_sys_openat fs/open.c:1432 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1432 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: 0033:0x7fcc9847ca60 Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 09 82 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 5c 82 02 00 8b 44 RSP: 002b:00007ffff9062490 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcc9847ca60 RDX: 0000000000000000 RSI: 00007ffff90625c0 RDI: 00000000ffffff9c RBP: 00007ffff90625c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007ffff9063680 R13: 00007fcc984c93b9 R14: 000055557ce74430 R15: 0000000000000005 vkms_vblank_simulate: vblank timer overrun ---------------- Code disassembly (best guess): 0: 89 da mov %ebx,%edx 2: 48 c1 ea 03 shr $0x3,%rdx 6: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx a: 48 89 d8 mov %rbx,%rax d: 83 e0 07 and $0x7,%eax 10: 83 c0 03 add $0x3,%eax 13: 38 d0 cmp %dl,%al 15: 7c 04 jl 0x1b 17: 84 d2 test %dl,%dl 19: 75 24 jne 0x3f 1b: 8b 03 mov (%rbx),%eax 1d: c1 e8 02 shr $0x2,%eax 20: 83 e0 01 and $0x1,%eax 23: 65 ff 0d 58 41 90 7e decl %gs:0x7e904158(%rip) # 0x7e904182 * 2a: 74 07 je 0x33 <-- trapping instruction 2c: 5b pop %rbx 2d: 5d pop %rbp 2e: c3 ret 2f: cc int3 30: cc int3 31: cc int3 32: cc int3 33: e8 b2 f2 8c ff call 0xff8cf2ea 38: 5b pop %rbx 39: 5d pop %rbp 3a: c3 ret 3b: cc int3 3c: cc int3 3d: cc int3 3e: cc int3 3f: 48 rex.W