------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff88805799a490 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.4.877/10641
Modules linked in:
CPU: 0 UID: 0 PID: 10641 Comm: syz.4.877 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 a2 c3 e4 0b 41 56 48 8b 14 dd 60 74 1b 8c 4c 89 e6 <67> 48 0f b9 3a 58 83 05 3c 83 da 0b 01 48 83 c4 18 5b 5d 41 5c 41
RSP: 0018:ffffc90000007a38 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffffffff8c1b73a0 RSI: ffffffff8c1b6fc0 RDI: ffffffff90e49e40
RBP: 0000000000000001 R08: ffff88805799a490 R09: ffffffff8bb2ba40
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c1b6fc0
R13: ffffffff8bb2ba80 R14: ffffffff8a7e0960 R15: ffffc90000007b38
FS:  00007f9c71bf66c0(0000) GS:ffff88812432b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f7f2ff8 CR3: 0000000043fbf000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:finish_task_switch.isra.0+0x20e/0xb80 kernel/sched/core.c:5155
Code: 49 04 0f 48 85 d2 0f 85 84 06 00 00 85 c0 0f 85 a7 01 00 00 48 89 df e8 20 e5 ff ff e8 4b a9 3a 00 fb 49 8d bc 24 80 16 00 00 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84
RSP: 0018:ffffc9000448f600 EFLAGS: 00000202
RAX: 0000000000009e7f RBX: ffff8880b843b1c0 RCX: 0000000000000040
RDX: 0000000000000000 RSI: ffffffff8de8208a RDI: ffff888032f81680
RBP: ffffc9000448f648 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888032f80000
R13: ffff888020f30000 R14: ffff888020f30000 R15: ffff8880b843c000
 context_switch kernel/sched/core.c:5301 [inline]
 __schedule+0xff6/0x6120 kernel/sched/core.c:6911
 preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7095
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
 _raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:194
 __unix_dgram_recvmsg+0x31a/0xc30 net/unix/af_unix.c:2602
 unix_dgram_recvmsg+0xd0/0x110 net/unix/af_unix.c:2676
 sock_recvmsg_nosec net/socket.c:1143 [inline]
 ____sys_recvmsg+0x5b3/0x640 net/socket.c:2875
 ___sys_recvmsg+0x16a/0x1a0 net/socket.c:2919
 do_recvmmsg+0x301/0x760 net/socket.c:3014
 __sys_recvmmsg net/socket.c:3088 [inline]
 __do_sys_recvmmsg net/socket.c:3111 [inline]
 __se_sys_recvmmsg net/socket.c:3104 [inline]
 __x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3104
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9c7399c819
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:00007f9c71bf6028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f9c73c16090 RCX: 00007f9c7399c819
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000004
RBP: 00007f9c73a32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9c73c16128 R14: 00007f9c73c16090 R15: 00007fff47078ac8
 </TASK>
----------------
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 a2 c3 e4 0b 	lea    0xbe4c3a2(%rip),%rdi        # 0xbe4c3bf
  1d:	41 56                	push   %r14
  1f:	48 8b 14 dd 60 74 1b 	mov    -0x73e48ba0(,%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 3c 83 da 0b 01 	addl   $0x1,0xbda833c(%rip)        # 0xbda8373
  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