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ODEBUG: free active (active state 0) object: ffff88805d766090 object type: timer_list hint: rose_t0timer_expiry+0x0/0x350
WARNING: CPU: 1 PID: 25684 at lib/debugobjects.c:518 debug_print_object lib/debugobjects.c:515 [inline]
WARNING: CPU: 1 PID: 25684 at lib/debugobjects.c:518 __debug_check_no_obj_freed lib/debugobjects.c:990 [inline]
WARNING: CPU: 1 PID: 25684 at lib/debugobjects.c:518 debug_check_no_obj_freed+0x446/0x540 lib/debugobjects.c:1020
Modules linked in:
CPU: 1 PID: 25684 Comm: syz.0.5477 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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 20 98 1c 8b 48 c7 c6 80 94 1c 8b 48 c7 c2 a0 99 1c 8b 8b 0c 24 4d 89 f8 41 55 e8 de 83 1f fd 48 83 c4 08 <0f> 0b 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc ff df ff 05 13 f6 59
RSP: 0018:ffffc900001f0a50 EFLAGS: 00010296
RAX: 4e432644f8ca8600 RBX: ffffffff975390f8 RCX: ffff888026cb9e00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffffff8accac60 R08: ffffc900001f0647 R09: 1ffff9200003e0c8
R10: dffffc0000000000 R11: fffff5200003e0c9 R12: ffff88805d766200
R13: ffffffff897afb80 R14: ffff88805d766000 R15: ffff88805d766090
FS: 0000555582fdb500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdc211e9f00 CR3: 000000002e771000 CR4: 00000000003506e0
Call Trace:
slab_free_hook mm/slub.c:1786 [inline]
slab_free_freelist_hook+0xd2/0x1a0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
__kmem_cache_free+0xba/0x1e0 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+0x189/0x540 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x542/0x800 kernel/time/timer.c:2023
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
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+0xd3/0x190 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:lockdep_unregister_key+0x50b/0x5b0 kernel/locking/lockdep.c:6490
Code: 54 17 91 48 c7 c6 20 d7 68 81 e8 40 2a 08 00 e8 3b 3d 08 00 e9 3d fc ff ff e8 71 74 1d 09 41 f7 c4 00 02 00 00 74 d1 fb 84 db <75> d0 eb e1 0f 0b 31 db eb 88 0f 0b e9 e4 fe ff ff e8 4f 73 1d 09
RSP: 0018:ffffc90004ac78a0 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 4e432644f8ca8600
RDX: 0000000000000001 RSI: ffffffff8acad6c0 RDI: ffffffff8b1c8e60
RBP: ffffc90004ac7980 R08: ffffffff91197127 R09: 1ffffffff2232e24
R10: dffffc0000000000 R11: fffffbfff2232e25 R12: 0000000000000207
R13: ffffffff90bc9fe0 R14: ffff88805ab53299 R15: 1ffff92000958f18
__qdisc_destroy+0x128/0x3b0 net/sched/sch_generic.c:1081
netdev_for_each_tx_queue include/linux/netdevice.h:2520 [inline]
dev_shutdown+0x96/0x440 net/sched/sch_generic.c:1465
unregister_netdevice_many_notify+0x8e0/0x1900 net/core/dev.c:11114
unregister_netdevice_many net/core/dev.c:11180 [inline]
unregister_netdevice_queue+0x32c/0x370 net/core/dev.c:11060
unregister_netdevice include/linux/netdevice.h:3137 [inline]
__tun_detach+0xd45/0x1500 drivers/net/tun.c:685
tun_detach drivers/net/tun.c:701 [inline]
tun_chr_close+0x10d/0x1c0 drivers/net/tun.c:3511
__fput+0x234/0x970 fs/file_table.c:384
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f794fd9c819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffff26a2a88 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f7950017da0 RCX: 00007f794fd9c819
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f7950017da0 R08: 00007f7950016038 R09: 0000000000000000
R10: 00000000003fec28 R11: 0000000000000246 R12: 000000000010ccc0
R13: 00007f795001609c R14: 000000000010ca1e R15: 00007f7950016090
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 91 xchg %eax,%ecx
1: 48 c7 c6 20 d7 68 81 mov $0xffffffff8168d720,%rsi
8: e8 40 2a 08 00 call 0x82a4d
d: e8 3b 3d 08 00 call 0x83d4d
12: e9 3d fc ff ff jmp 0xfffffc54
17: e8 71 74 1d 09 call 0x91d748d
1c: 41 f7 c4 00 02 00 00 test $0x200,%r12d
23: 74 d1 je 0xfffffff6
25: fb sti
26: 84 db test %bl,%bl
* 28: 75 d0 jne 0xfffffffa <-- trapping instruction
2a: eb e1 jmp 0xd
2c: 0f 0b ud2
2e: 31 db xor %ebx,%ebx
30: eb 88 jmp 0xffffffba
32: 0f 0b ud2
34: e9 e4 fe ff ff jmp 0xffffff1d
39: e8 4f 73 1d 09 call 0x91d738d