------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: rose_transmit_restart_request net/rose/rose_link.c:-1 [inline]
ODEBUG: free active (active state 0) object type: timer_list hint: rose_t0timer_expiry+0x0/0x350 net/rose/rose_link.c:284
WARNING: CPU: 1 PID: 23953 at lib/debugobjects.c:518 debug_print_object lib/debugobjects.c:515 [inline]
WARNING: CPU: 1 PID: 23953 at lib/debugobjects.c:518 __debug_check_no_obj_freed lib/debugobjects.c:979 [inline]
WARNING: CPU: 1 PID: 23953 at lib/debugobjects.c:518 debug_check_no_obj_freed+0x43c/0x530 lib/debugobjects.c:1009
Modules linked in:
CPU: 1 PID: 23953 Comm: syz.9.4449 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:debug_print_object lib/debugobjects.c:515 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:979 [inline]
RIP: 0010:debug_check_no_obj_freed+0x43c/0x530 lib/debugobjects.c:1009
Code: ef e8 88 b6 bd fd 4c 8b 45 00 48 c7 c7 80 16 df 8a 48 c7 c6 40 13 df 8a 48 c7 c2 e0 17 df 8a 8b 0c 24 4d 89 e9 e8 e4 1b 38 fd <0f> 0b 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc ff df ff 05 65 4a 0a
RSP: 0018:ffffc900001e0a10 EFLAGS: 00010246
RAX: 1410e2a979a2c300 RBX: ffffffff96e70a70 RCX: ffff88802b440000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffffff8a8dedc0 R08: ffffc900001e0687 R09: 1ffff9200003c0d0
R10: dffffc0000000000 R11: fffff5200003c0d1 R12: ffff888057f0c200
R13: ffffffff892b51e0 R14: ffff888057f0c000 R15: ffff888057f0c090
FS: 00005555802e8500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5bf8188fe8 CR3: 00000000284f6000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
slab_free_hook mm/slub.c:1704 [inline]
slab_free_freelist_hook+0xd2/0x1a0 mm/slub.c:1755
slab_free mm/slub.c:3687 [inline]
__kmem_cache_free+0xb6/0x1f0 mm/slub.c:3700
rose_neigh_put include/net/rose.h:166 [inline]
rose_timer_expiry+0x4a7/0x5d0 net/rose/rose_timer.c:183
call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x53e/0x800 kernel/time/timer.c:2023
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:lockdep_unregister_key+0x4e8/0x550 kernel/locking/lockdep.c:6370
Code: 71 aa 90 48 c7 c6 20 e6 64 81 e8 73 a8 07 00 e8 de bb 07 00 e9 5c fc ff ff e8 74 df c8 08 41 f7 c4 00 02 00 00 74 d1 fb 84 db <75> d0 eb e1 0f 0b eb 88 0f 0b e9 f8 fe ff ff 0f 0b e9 45 ff ff ff
RSP: 0018:ffffc900036478e0 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1410e2a979a2c300
RDX: 0000000000000001 RSI: ffffffff8a8c1d80 RDI: ffffffff8adf0d20
RBP: ffffc900036479c0 R08: ffffffff90aa9797 R09: 1ffffffff21552f2
R10: dffffc0000000000 R11: fffffbfff21552f3 R12: 0000000000000a03
R13: ffff88807a835299 R14: ffffffff90aa7198 R15: 1ffff920006c8f20
__qdisc_destroy+0x128/0x430 net/sched/sch_generic.c:1081
netdev_for_each_tx_queue include/linux/netdevice.h:2465 [inline]
dev_shutdown+0x92/0x440 net/sched/sch_generic.c:1465
unregister_netdevice_many+0xa4f/0x1930 net/core/dev.c:11007
unregister_netdevice_queue+0x324/0x370 net/core/dev.c:10947
unregister_netdevice include/linux/netdevice.h:3075 [inline]
__tun_detach+0xd4a/0x1500 drivers/net/tun.c:685
tun_detach drivers/net/tun.c:701 [inline]
tun_chr_close+0x109/0x1b0 drivers/net/tun.c:3492
__fput+0x22c/0x920 fs/file_table.c:320
task_work_run+0x1d0/0x260 kernel/task_work.c:203
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:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fca1c99c799
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:00007ffe7baaec18 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fca1cc17da0 RCX: 00007fca1c99c799
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fca1cc17da0 R08: 00007fca1cc16308 R09: 0000000000000000
R10: 00000000003ff378 R11: 0000000000000246 R12: 000000000014103e
R13: 00007fca1cc1618c R14: 0000000000140e93 R15: 00007fca1cc16180
----------------
Code disassembly (best guess):
0: 71 aa jno 0xffffffac
2: 90 nop
3: 48 c7 c6 20 e6 64 81 mov $0xffffffff8164e620,%rsi
a: e8 73 a8 07 00 call 0x7a882
f: e8 de bb 07 00 call 0x7bbf2
14: e9 5c fc ff ff jmp 0xfffffc75
19: e8 74 df c8 08 call 0x8c8df92
1e: 41 f7 c4 00 02 00 00 test $0x200,%r12d
25: 74 d1 je 0xfffffff8
27: fb sti
28: 84 db test %bl,%bl
* 2a: 75 d0 jne 0xfffffffc <-- trapping instruction
2c: eb e1 jmp 0xf
2e: 0f 0b ud2
30: eb 88 jmp 0xffffffba
32: 0f 0b ud2
34: e9 f8 fe ff ff jmp 0xffffff31
39: 0f 0b ud2
3b: e9 45 ff ff ff jmp 0xffffff85