------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff888025a4d890 object type: timer_list hint: rose_t0timer_expiry+0x0/0x350
WARNING: CPU: 0 PID: 18194 at lib/debugobjects.c:518 debug_print_object lib/debugobjects.c:515 [inline]
WARNING: CPU: 0 PID: 18194 at lib/debugobjects.c:518 __debug_check_no_obj_freed lib/debugobjects.c:990 [inline]
WARNING: CPU: 0 PID: 18194 at lib/debugobjects.c:518 debug_check_no_obj_freed+0x446/0x540 lib/debugobjects.c:1020
Modules linked in:
CPU: 0 PID: 18194 Comm: syz.2.2435 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
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 a0 8b 1c 8b 48 c7 c6 00 88 1c 8b 48 c7 c2 20 8d 1c 8b 8b 0c 24 4d 89 f8 41 55 e8 ce 4c 20 fd 48 83 c4 08 <0f> 0b 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc ff df ff 05 a3 8a 5a
RSP: 0018:ffffc90000007a50 EFLAGS: 00010296
RAX: d1788597bea2ea00 RBX: ffffffff97528f68 RCX: ffff88805c23bc00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffffff8accab20 R08: ffffc90000007647 R09: 1ffff92000000ec8
R10: dffffc0000000000 R11: fffff52000000ec9 R12: ffff888025a4da00
R13: ffffffff89794c20 R14: ffff888025a4d000 R15: ffff888025a4d890
FS: 000055557a562500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2d2cbe8600 CR3: 000000006a9d9000 CR4: 00000000003506f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
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: f4 16 91 48 c7 c6 60 ce 68 81 e8 60 29 08 00 e8 5b 3c 08 00 e9 3d fc ff ff e8 21 6e 1b 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 ff 6c 1b 09
RSP: 0018:ffffc900047df8a0 EFLAGS: 00000202
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: d1788597bea2ea00
RDX: 0000000000000001 RSI: ffffffff8acad5e0 RDI: ffffffff8b1c81e0
RBP: ffffc900047df980 R08: ffffffff91172de7 R09: 1ffffffff222e5bc
R10: dffffc0000000000 R11: fffffbfff222e5bd R12: 0000000000000a02
R13: ffffffff90b56820 R14: ffff88802e609299 R15: 1ffff920008fbf18
__qdisc_destroy+0x128/0x3b0 net/sched/sch_generic.c:1081
qdisc_put net/sched/sch_generic.c:1107 [inline]
dev_shutdown+0x34f/0x440 net/sched/sch_generic.c:1495
unregister_netdevice_many_notify+0x8e0/0x1900 net/core/dev.c:11120
unregister_netdevice_many net/core/dev.c:11186 [inline]
unregister_netdevice_queue+0x32c/0x370 net/core/dev.c:11066
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: 0033:0x7f6eb979aeb9
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:00007ffdadd3b4d8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffdadd3b5c0 RCX: 00007f6eb979aeb9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000012e751 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2f920000 R11: 0000000000000246 R12: 00007ffdadd3b600
R13: 00007f6eb9a15fac R14: 000000000012e81f R15: 00007f6eb9a15fa0
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 91 xchg %eax,%ecx
1: 48 c7 c6 60 ce 68 81 mov $0xffffffff8168ce60,%rsi
8: e8 60 29 08 00 call 0x8296d
d: e8 5b 3c 08 00 call 0x83c6d
12: e9 3d fc ff ff jmp 0xfffffc54
17: e8 21 6e 1b 09 call 0x91b6e3d
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 ff 6c 1b 09 call 0x91b6d3d