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ODEBUG: free active (active state 0) object: ffff888025c20090 object type: timer_list hint: rose_t0timer_expiry+0x0/0x350
WARNING: CPU: 1 PID: 24 at lib/debugobjects.c:518 debug_print_object lib/debugobjects.c:515 [inline]
WARNING: CPU: 1 PID: 24 at lib/debugobjects.c:518 __debug_check_no_obj_freed lib/debugobjects.c:990 [inline]
WARNING: CPU: 1 PID: 24 at lib/debugobjects.c:518 debug_check_no_obj_freed+0x446/0x540 lib/debugobjects.c:1020
Modules linked in:
CPU: 1 PID: 24 Comm: kworker/1:0H Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events_highpri snd_vmidi_output_work
RIP: 0010:debug_print_object lib/debugobjects.c:515 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:990 [inline]
RIP: 0010:debug_check_no_obj_freed+0x446/0x540 lib/debugobjects.c:1020
Code: 4c 8b 4d 00 48 c7 c7 80 7c fc 8a 48 c7 c6 e0 78 fc 8a 48 c7 c2 00 7e fc 8a 8b 0c 24 4d 89 f8 41 55 e8 5e 27 2a fd 48 83 c4 08 <0f> 0b 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc ff df ff 05 f3 e4 24
RSP: 0018:ffffc900001f0a50 EFLAGS: 00010296
RAX: 7b2a8852d22a6f00 RBX: ffffffff9705dda0 RCX: ffff88801ca48000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffffff8aaca000 R08: ffffc900001f0647 R09: 1ffff9200003e0c8
R10: dffffc0000000000 R11: fffff5200003e0c9 R12: ffff888025c20200
R13: ffffffff8966f5b0 R14: ffff888025c20000 R15: ffff888025c20090
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 0000000060620000 CR4: 00000000003506e0
Call Trace:
slab_free_hook mm/slub.c:1786 [inline]
slab_free_freelist_hook+0xd2/0x1b0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
__kmem_cache_free+0xba/0x1f0 mm/slub.c:3843
rose_neigh_put include/net/rose.h:166 [inline]
rose_timer_expiry+0x4c6/0x5f0 net/rose/rose_timer.c:183
call_timer_fn+0x16e/0x530 kernel/time/timer.c:1700
expire_timers kernel/time/timer.c:1751 [inline]
__run_timers+0x52d/0x7d0 kernel/time/timer.c:2022
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa9/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 fa 31 14 f7 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 e2 a9 e3 f6 65 8b 05 33 f8 8b 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc900001e7540 EFLAGS: 00000206
RAX: 7b2a8852d22a6f00 RBX: 0000000000000a02 RCX: 7b2a8852d22a6f00
RDX: dffffc0000000000 RSI: ffffffff8aaabca0 RDI: 0000000000000001
RBP: ffffc900001e75d0 R08: ffffffff90da7587 R09: 1ffffffff21b4eb0
R10: dffffc0000000000 R11: fffffbfff21b4eb1 R12: dffffc0000000000
R13: 1ffff11004acc041 R14: ffff888025660278 R15: 1ffff9200003cea8
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
snd_seq_oss_readq_put_event+0x16b/0x250 sound/core/seq/oss/seq_oss_readq.c:-1
snd_seq_oss_readq_puts+0xde/0x160 sound/core/seq/oss/seq_oss_readq.c:100
send_midi_event sound/core/seq/oss/seq_oss_midi.c:629 [inline]
snd_seq_oss_midi_input+0x476/0x960 sound/core/seq/oss/seq_oss_midi.c:544
__snd_seq_deliver_single_event sound/core/seq/seq_clientmgr.c:655 [inline]
snd_seq_deliver_single_event+0x5ac/0xb70 sound/core/seq/seq_clientmgr.c:718
__deliver_to_subscribers sound/core/seq/seq_clientmgr.c:773 [inline]
deliver_to_subscribers sound/core/seq/seq_clientmgr.c:803 [inline]
snd_seq_deliver_event+0x503/0x970 sound/core/seq/seq_clientmgr.c:853
snd_seq_kernel_client_dispatch+0x201/0x2f0 sound/core/seq/seq_clientmgr.c:2538
snd_vmidi_output_work+0x24f/0x410 sound/core/seq/seq_virmidi.c:157
process_one_work kernel/workqueue.c:2634 [inline]
process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
----------------
Code disassembly (best guess):
0: 74 05 je 0x7
2: e8 fa 31 14 f7 call 0xf7143201
7: 48 c7 44 24 20 00 00 movq $0x0,0x20(%rsp)
e: 00 00
10: 9c pushf
11: 8f 44 24 20 pop 0x20(%rsp)
15: f6 44 24 21 02 testb $0x2,0x21(%rsp)
1a: 75 4b jne 0x67
1c: f7 c3 00 02 00 00 test $0x200,%ebx
22: 74 01 je 0x25
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 e2 a9 e3 f6 call 0xf6e3aa11 <-- trapping instruction
2f: 65 8b 05 33 f8 8b 75 mov %gs:0x758bf833(%rip),%eax # 0x758bf869
36: 85 c0 test %eax,%eax
38: 74 3c je 0x76
3a: 48 rex.W
3b: c7 .byte 0xc7
3c: 04 24 add $0x24,%al
3e: 0e (bad)
3f: 36 ss