================================ WARNING: inconsistent lock state 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.1/11473 [HC0[0]:SC1[1]:HE0:SE0] takes: ffff888029a92148 (&timer->lock){+.?.}-{2:2}, at: class_spinlock_irqsave_constructor include/linux/spinlock.h:574 [inline] ffff888029a92148 (&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: 553 hardirqs last enabled at (552): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] hardirqs last enabled at (552): [] _raw_spin_unlock_irq+0x23/0x50 kernel/locking/spinlock.c:202 hardirqs last disabled at (553): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (553): [] _raw_spin_lock_irqsave+0x52/0x60 kernel/locking/spinlock.c:162 softirqs last enabled at (426): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (426): [] __do_softirq+0x596/0x8de kernel/softirq.c:583 softirqs last disabled at (549): [] invoke_softirq kernel/softirq.c:428 [inline] softirqs last disabled at (549): [] __irq_exit_rcu kernel/softirq.c:633 [inline] softirqs last disabled at (549): [] 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 *** 3 locks held by syz-executor.1/11473: #0: ffff8880209a74c8 (&disk->open_mutex){+.+.}-{3:3}, at: loop_reread_partitions+0x47/0x140 drivers/block/loop.c:513 #1: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #1: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #1: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: blk_mq_submit_bio+0x186f/0x2090 block/blk-mq.c:3024 #2: ffffc90000007cb0 ((&priv->tlist)){+.-.}-{0:0}, at: call_timer_fn+0x11a/0x5b0 kernel/time/timer.c:1789 stack backtrace: CPU: 0 PID: 11473 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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 Code: 90 f3 0f 1e fa 53 48 8b 74 24 08 48 89 fb 48 83 c7 18 e8 0a 40 95 f6 48 89 df e8 72 bb 95 f6 e8 dd 05 be f6 fb bf 01 00 00 00 02 09 87 f6 65 8b 05 53 d1 2d 75 85 c0 74 06 5b c3 cc cc cc cc RSP: 0018:ffffc90004376f38 EFLAGS: 00000202 RAX: 0000000000000223 RBX: ffff8880209330c0 RCX: 1ffffffff27b9817 RDX: 0000000000000000 RSI: ffffffff8b0cb740 RDI: 0000000000000001 RBP: ffff8880209f4c80 R08: 0000000000000001 R09: fffffbfff27b4e3b R10: ffffffff93da71df R11: 0000000000000000 R12: 0000000000000000 R13: ffff88802ebbbb60 R14: ffff888020933000 R15: ffff88802ebbbb68 spin_unlock_irq include/linux/spinlock.h:401 [inline] loop_queue_work drivers/block/loop.c:883 [inline] loop_queue_rq+0x5ef/0x1210 drivers/block/loop.c:1874 __blk_mq_issue_directly+0xe0/0x270 block/blk-mq.c:2600 blk_mq_try_issue_directly+0x1c8/0x410 block/blk-mq.c:2659 blk_mq_submit_bio+0x189e/0x2090 block/blk-mq.c:3024 __submit_bio+0xfd/0x310 block/blk-core.c:619 __submit_bio_noacct_mq block/blk-core.c:698 [inline] submit_bio_noacct_nocheck+0x951/0xcf0 block/blk-core.c:727 submit_bio_noacct+0x746/0x1b70 block/blk-core.c:837 submit_bh fs/buffer.c:2809 [inline] block_read_full_folio+0x72b/0xa70 fs/buffer.c:2436 filemap_read_folio+0xe9/0x2c0 mm/filemap.c:2333 do_read_cache_folio+0x209/0x550 mm/filemap.c:3703 read_mapping_folio include/linux/pagemap.h:894 [inline] read_part_sector+0xf6/0x440 block/partitions/core.c:715 adfspart_check_ICS+0x94/0x940 block/partitions/acorn.c:360 check_partition block/partitions/core.c:138 [inline] blk_add_partitions block/partitions/core.c:582 [inline] bdev_disk_changed+0x7e3/0x1630 block/partitions/core.c:686 loop_reread_partitions+0x70/0x140 drivers/block/loop.c:514 loop_set_status+0x5aa/0x710 drivers/block/loop.c:1316 loop_set_status_old+0x163/0x1d0 drivers/block/loop.c:1402 lo_ioctl+0x66d/0x1950 drivers/block/loop.c:1559 blkdev_ioctl+0x2f7/0x770 block/ioctl.c:640 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: 0033:0x7f0efde7de69 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:00007f0efec0e0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f0efdfabf80 RCX: 00007f0efde7de69 RDX: 0000000020000540 RSI: 0000000000004c02 RDI: 0000000000000003 RBP: 00007f0efdeca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f0efdfabf80 R15: 00007ffc8c6a7eb8 vkms_vblank_simulate: vblank timer overrun vkms_vblank_simulate: vblank timer overrun ---------------- Code disassembly (best guess): 0: 90 nop 1: f3 0f 1e fa endbr64 5: 53 push %rbx 6: 48 8b 74 24 08 mov 0x8(%rsp),%rsi b: 48 89 fb mov %rdi,%rbx e: 48 83 c7 18 add $0x18,%rdi 12: e8 0a 40 95 f6 call 0xf6954021 17: 48 89 df mov %rbx,%rdi 1a: e8 72 bb 95 f6 call 0xf695bb91 1f: e8 dd 05 be f6 call 0xf6be0601 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 02 09 87 f6 call 0xf6870931 <-- trapping instruction 2f: 65 8b 05 53 d1 2d 75 mov %gs:0x752dd153(%rip),%eax # 0x752dd189 36: 85 c0 test %eax,%eax 38: 74 06 je 0x40 3a: 5b pop %rbx 3b: c3 ret 3c: cc int3 3d: cc int3 3e: cc int3 3f: cc int3