------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff888084090c90 object type: timer_list hint: rose_t0timer_expiry+0x0/0x560 net/rose/rose_link.c:-1
WARNING: lib/debugobjects.c:632 at debug_print_object lib/debugobjects.c:629 [inline], CPU#0: syz.3.4515/21534
WARNING: lib/debugobjects.c:632 at __debug_check_no_obj_freed lib/debugobjects.c:1116 [inline], CPU#0: syz.3.4515/21534
WARNING: lib/debugobjects.c:632 at debug_check_no_obj_freed+0x405/0x550 lib/debugobjects.c:1146, CPU#0: syz.3.4515/21534
Modules linked in:
CPU: 0 UID: 0 PID: 21534 Comm: syz.3.4515 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:debug_print_object lib/debugobjects.c:629 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:1116 [inline]
RIP: 0010:debug_check_no_obj_freed+0x44a/0x550 lib/debugobjects.c:1146
Code: 89 44 24 20 e8 e7 2c 77 fd 48 8b 44 24 20 4c 8b 4d 00 4c 89 ef 48 c7 c6 40 bb 27 8c 48 c7 c2 c0 c0 27 8c 8b 0c 24 4d 89 f8 50 <67> 48 0f b9 3a 48 83 c4 08 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc
RSP: 0018:ffffc90000007b68 EFLAGS: 00010246
RAX: ffffffff8a965980 RBX: ffffffff9a45b5a8 RCX: 0000000000000000
RDX: ffffffff8c27c0c0 RSI: ffffffff8c27bb40 RDI: ffffffff901bee60
RBP: ffffffff8bcf3ce0 R08: ffff888084090c90 R09: ffffffff8bcf5000
R10: dffffc0000000000 R11: ffffffff81b1e6a0 R12: ffff888084090e00
R13: ffffffff901bee60 R14: ffff888084090000 R15: ffff888084090c90
FS: 00007f38701a26c0(0000) GS:ffff888125467000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1995412000 CR3: 00000000872fa000 CR4: 00000000003526f0
Call Trace:
slab_free_hook mm/slub.c:2623 [inline]
slab_free mm/slub.c:6168 [inline]
kfree+0x13a/0x630 mm/slub.c:6486
rose_neigh_put include/net/rose.h:166 [inline]
rose_timer_expiry+0x4cb/0x600 net/rose/rose_timer.c:183
call_timer_fn+0x192/0x640 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers kernel/time/timer.c:2373 [inline]
__run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385
run_timer_base kernel/time/timer.c:2394 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404
handle_softirqs+0x22a/0x870 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x5f/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+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:194
Code: f7 e8 2d dd f0 f5 f7 c3 00 02 00 00 74 05 e8 a0 34 1c f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 64 9b e2 f5 65 8b 05 0d 40 6a 07 85 c0 74 18 5b 41 5e c3 cc cc
RSP: 0018:ffffc9000cdc7220 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000287 RCX: 0000000080000003
RDX: 0000000000000000 RSI: ffffffff8df209e8 RDI: 0000000000000001
RBP: ffff888026609e80 R08: ffffffff90112cb7 R09: 1ffffffff2022596
R10: dffffc0000000000 R11: fffffbfff2022597 R12: dffffc0000000000
R13: 0000000000000001 R14: ffff88802660a8f8 R15: ffff888026609e94
class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:570 [inline]
try_to_wake_up+0x7be/0x1390 kernel/sched/core.c:4130
wake_up_process kernel/sched/core.c:4374 [inline]
wake_up_q+0x85/0xd0 kernel/sched/core.c:1100
raw_spin_unlock_irqrestore_wake include/linux/sched/wake_q.h:99 [inline]
__mutex_unlock_slowpath+0x6eb/0x7d0 kernel/locking/mutex.c:981
__rtnl_unlock+0x68/0xf0 net/core/rtnetlink.c:143
netdev_run_todo+0x2c9/0xde0 net/core/dev.c:11709
rtnl_unlock net/core/rtnetlink.c:157 [inline]
rtnetlink_rcv_msg+0x785/0xbe0 net/core/rtnetlink.c:6968
netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:721 [inline]
__sock_sendmsg net/socket.c:736 [inline]
____sys_sendmsg+0x972/0x9f0 net/socket.c:2585
___sys_sendmsg+0x2a5/0x360 net/socket.c:2639
__sys_sendmsg net/socket.c:2671 [inline]
__do_sys_sendmsg net/socket.c:2676 [inline]
__se_sys_sendmsg net/socket.c:2674 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2674
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f386f39c799
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:00007f38701a2028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f386f615fa0 RCX: 00007f386f39c799
RDX: 0000000000000000 RSI: 0000200000000200 RDI: 0000000000000009
RBP: 00007f386f432c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f386f616038 R14: 00007f386f615fa0 R15: 00007ffd22c99ce8
----------------
Code disassembly (best guess):
0: 89 44 24 20 mov %eax,0x20(%rsp)
4: e8 e7 2c 77 fd call 0xfd772cf0
9: 48 8b 44 24 20 mov 0x20(%rsp),%rax
e: 4c 8b 4d 00 mov 0x0(%rbp),%r9
12: 4c 89 ef mov %r13,%rdi
15: 48 c7 c6 40 bb 27 8c mov $0xffffffff8c27bb40,%rsi
1c: 48 c7 c2 c0 c0 27 8c mov $0xffffffff8c27c0c0,%rdx
23: 8b 0c 24 mov (%rsp),%ecx
26: 4d 89 f8 mov %r15,%r8
29: 50 push %rax
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 48 83 c4 08 add $0x8,%rsp
33: 4c 8b 6c 24 18 mov 0x18(%rsp),%r13
38: 48 rex.W
39: b9 00 00 00 00 mov $0x0,%ecx
3e: 00 fc add %bh,%ah