------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff888041835490 object type: timer_list hint: rose_t0timer_expiry+0x0/0x150 include/linux/skbuff.h:2928
WARNING: lib/debugobjects.c:629 at debug_print_object+0x18e/0x2a0 lib/debugobjects.c:629, CPU#0: syz.0.6218/29916
Modules linked in:
CPU: 0 UID: 0 PID: 29916 Comm: syz.0.6218 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:debug_print_object+0x19b/0x2a0 lib/debugobjects.c:629
Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4f 48 8d 3d 42 08 e5 0b 41 56 48 8b 14 dd 60 30 1b 8c 4c 89 e6 <67> 48 0f b9 3a 58 83 05 ec c4 da 0b 01 48 83 c4 18 5b 5d 41 5c 41
RSP: 0018:ffffc90000007a38 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffffffff8c1b2fa0 RSI: ffffffff8c1b2bc0 RDI: ffffffff90e44b50
RBP: 0000000000000001 R08: ffff888041835490 R09: ffffffff8bb2bba0
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c1b2bc0
R13: ffffffff8bb2bbe0 R14: ffffffff8a7cff80 R15: ffffc90000007b38
FS: 0000555560464500(0000) GS:ffff888124338000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3ec32f CR3: 000000008162e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
__debug_check_no_obj_freed lib/debugobjects.c:1116 [inline]
debug_check_no_obj_freed+0x4da/0x630 lib/debugobjects.c:1146
slab_free_hook mm/slub.c:2616 [inline]
slab_free mm/slub.c:6165 [inline]
kfree+0x38f/0x6b0 mm/slub.c:6483
rose_neigh_put include/net/rose.h:166 [inline]
rose_timer_expiry+0x53f/0x630 net/rose/rose_timer.c:183
call_timer_fn+0x19a/0x670 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers+0x757/0xb30 kernel/time/timer.c:2373
__run_timer_base kernel/time/timer.c:2385 [inline]
__run_timer_base kernel/time/timer.c:2377 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2394
run_timer_softirq+0x1a/0x50 kernel/time/timer.c:2404
handle_softirqs+0x1eb/0x9e0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xef/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lockdep_unregister_key+0x12b/0x1d0 kernel/locking/lockdep.c:6616
Code: e8 da dd ff ff 48 83 2d 1a a2 49 14 01 89 c3 e8 2b e0 ff ff 9c 58 f6 c4 02 0f 85 8a 00 00 00 f7 c5 00 02 00 00 74 01 fb 84 db <75> 40 5b 5d 41 5c e9 ea a9 09 00 9c 58 f6 c4 02 0f 84 16 ff ff ff
RSP: 0018:ffffc90008fbfa60 EFLAGS: 00000246
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8df6c700 RDI: ffffffff8c1b1ea0
RBP: 0000000000000246 R08: 0000000000072428 R09: ffffffff963ca470
R10: 0000000000000200 R11: 0000000000000000 R12: ffffffff97955c88
R13: ffff888084afc000 R14: ffff888084afc4d0 R15: 0000000000000100
qdisc_lock_uninit include/net/pkt_sched.h:332 [inline]
__qdisc_destroy+0x172/0x560 net/sched/sch_generic.c:1077
qdisc_put+0xb0/0xf0 net/sched/sch_generic.c:1103
shutdown_scheduler_queue+0xa5/0x160 net/sched/sch_generic.c:1156
netdev_for_each_tx_queue include/linux/netdevice.h:2684 [inline]
dev_shutdown+0xb3/0x440 net/sched/sch_generic.c:1461
unregister_netdevice_many_notify+0xd56/0x2580 net/core/dev.c:12419
unregister_netdevice_many net/core/dev.c:12494 [inline]
unregister_netdevice_queue net/core/dev.c:12308 [inline]
unregister_netdevice_queue+0x30b/0x3c0 net/core/dev.c:12298
unregister_netdevice include/linux/netdevice.h:3409 [inline]
__tun_detach+0x1173/0x1480 drivers/net/tun.c:621
tun_detach drivers/net/tun.c:637 [inline]
tun_chr_close+0xc2/0x220 drivers/net/tun.c:3436
__fput+0x3ff/0xb40 fs/file_table.c:469
task_work_run+0x150/0x240 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
exit_to_user_mode_loop+0x100/0x4a0 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x67c/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1de299c819
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:00007ffff07b3898 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffff07b3980 RCX: 00007f1de299c819
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00000000001d3a6e R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33120000 R11: 0000000000000246 R12: 00007ffff07b39c0
R13: 00007f1de2c15fac R14: 00000000001d3b2c R15: 00007f1de2c15fa0
----------------
Code disassembly (best guess):
0: b8 00 00 00 00 mov $0x0,%eax
5: 00 fc add %bh,%ah
7: ff lcall (bad)
8: df 48 89 fisttps -0x77(%rax)
b: fa cli
c: 48 c1 ea 03 shr $0x3,%rdx
10: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
14: 75 4f jne 0x65
16: 48 8d 3d 42 08 e5 0b lea 0xbe50842(%rip),%rdi # 0xbe5085f
1d: 41 56 push %r14
1f: 48 8b 14 dd 60 30 1b mov -0x73e4cfa0(,%rbx,8),%rdx
26: 8c
27: 4c 89 e6 mov %r12,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 58 pop %rax
30: 83 05 ec c4 da 0b 01 addl $0x1,0xbdac4ec(%rip) # 0xbdac523
37: 48 83 c4 18 add $0x18,%rsp
3b: 5b pop %rbx
3c: 5d pop %rbp
3d: 41 5c pop %r12
3f: 41 rex.B