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ODEBUG: free active (active state 0) object: ffff888054eae090 object type: timer_list hint: rose_t0timer_expiry+0x0/0x150 include/linux/skbuff.h:2927
WARNING: CPU: 0 PID: 8493 at lib/debugobjects.c:612 debug_print_object+0x1a2/0x2b0 lib/debugobjects.c:612
Modules linked in:
CPU: 0 UID: 0 PID: 8493 Comm: syz.4.639 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:debug_print_object+0x1a2/0x2b0 lib/debugobjects.c:612
Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 54 41 56 48 8b 14 dd 20 52 d0 8b 4c 89 e6 48 c7 c7 a0 46 d0 8b e8 0f 0d d0 fc 90 <0f> 0b 90 90 58 83 05 16 5e b6 0b 01 48 83 c4 18 5b 5d 41 5c 41 5d
RSP: 0018:ffffc90000007a18 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffff81799b88
RDX: ffff888027582480 RSI: ffffffff81799b95 RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff8bd04d40
R13: ffffffff8b6fffe0 R14: ffffffff8a46cd10 R15: ffffc90000007b18
FS: 00007f0e4a1da6c0(0000) GS:ffff888124e67000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000005000 CR3: 000000006a849000 CR4: 00000000003526f0
Call Trace:
__debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
debug_check_no_obj_freed+0x4b7/0x600 lib/debugobjects.c:1129
slab_free_hook mm/slub.c:2445 [inline]
slab_free mm/slub.c:6566 [inline]
kfree+0x291/0x6d0 mm/slub.c:6773
rose_neigh_put include/net/rose.h:166 [inline]
rose_timer_expiry+0x53f/0x630 net/rose/rose_timer.c:183
call_timer_fn+0x19a/0x620 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers+0x6ef/0x960 kernel/time/timer.c:2372
__run_timer_base kernel/time/timer.c:2384 [inline]
__run_timer_base kernel/time/timer.c:2376 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2393
run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403
handle_softirqs+0x219/0x8e0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1052
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 ca 58 43 f6 48 89 df e8 b2 ac 43 f6 e8 fd 21 6f f6 fb bf 01 00 00 00 02 b8 33 f6 65 8b 05 0b ae 27 08 85 c0 74 06 5b c3 cc cc cc cc
RSP: 0018:ffffc90004c9fb38 EFLAGS: 00000206
RAX: 0000000000075603 RBX: ffff888030294b38 RCX: ffffffff81c3030f
RDX: 0000000000000000 RSI: ffffffff8d82768a RDI: 0000000000000001
RBP: ffffc90004c9fbd8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff905fba97 R11: 0000000000000000 R12: ffff888027582480
R13: ffff888027582480 R14: ffff88802f592858 R15: ffff8880783ae540
spin_unlock_irq include/linux/spinlock.h:401 [inline]
snd_rawmidi_write+0x48c/0xc10 sound/core/rawmidi.c:1615
do_loop_readv_writev fs/read_write.c:850 [inline]
do_loop_readv_writev fs/read_write.c:835 [inline]
vfs_writev+0x5dc/0xde0 fs/read_write.c:1059
do_writev+0x28c/0x340 fs/read_write.c:1103
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0e4938eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0e4a1da038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f0e495e5fa0 RCX: 00007f0e4938eec9
RDX: 0000000000000002 RSI: 0000200000000840 RDI: 0000000000000005
RBP: 00007f0e49411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0e495e6038 R14: 00007f0e495e5fa0 R15: 00007ffc4f21b248
----------------
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 ca 58 43 f6 call 0xf64358e1
17: 48 89 df mov %rbx,%rdi
1a: e8 b2 ac 43 f6 call 0xf643acd1
1f: e8 fd 21 6f f6 call 0xf66f2221
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 02 b8 33 f6 call 0xf633b831 <-- trapping instruction
2f: 65 8b 05 0b ae 27 08 mov %gs:0x827ae0b(%rip),%eax # 0x827ae41
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