------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff8880272cf490 object type: timer_list hint: rose_t0timer_expiry+0x0/0x150 include/linux/skbuff.h:2927
WARNING: lib/debugobjects.c:612 at debug_print_object+0x18e/0x2a0 lib/debugobjects.c:612, CPU#1: dhcpcd-run-hook/18520
Modules linked in:
CPU: 1 UID: 0 PID: 18520 Comm: dhcpcd-run-hook Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:debug_print_object+0x19b/0x2a0 lib/debugobjects.c:612
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 f2 0d d2 0b 41 56 48 8b 14 dd 60 47 fa 8b 4c 89 e6 <67> 48 0f b9 3a 58 83 05 9c f5 c7 0b 01 48 83 c4 18 5b 5d 41 5c 41
RSP: 0018:ffffc900006a0a18 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffffffff8bfa46a0 RSI: ffffffff8bfa42c0 RDI: ffffffff90c194c0
RBP: 0000000000000001 R08: ffff8880272cf490 R09: ffffffff8b92b900
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8bfa42c0
R13: ffffffff8b92b940 R14: ffffffff8a662a20 R15: ffffc900006a0b18
FS:  0000000000000000(0000) GS:ffff8880d66db000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f92358bb286 CR3: 00000000336a2000 CR4: 0000000000352ef0
Call Trace:
 <IRQ>
 __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
 debug_check_no_obj_freed+0x4da/0x630 lib/debugobjects.c:1129
 slab_free_hook mm/slub.c:2471 [inline]
 slab_free mm/slub.c:6674 [inline]
 kfree+0x34c/0x690 mm/slub.c:6882
 rose_neigh_put include/net/rose.h:166 [inline]
 rose_timer_expiry+0x53f/0x630 net/rose/rose_timer.c:183
 call_timer_fn+0x19a/0x590 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers+0x757/0xac0 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+0x1ea/0x910 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:unlink_file_vma_batch_process+0x75/0x310 mm/vma.c:1773
Code: c1 ea 03 80 3c 02 00 0f 85 98 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 58 48 8d 7b 50 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 6b 02 00 00 48 8b 43 50 48 89 04 24 48 05 88 01 00 00 48 89
RSP: 0018:ffffc900049a7710 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffff88803838fc00 RCX: ffffffff82614ad6
RDX: 1ffff11007071f8a RSI: ffffffff82603faa RDI: ffff88803838fc50
RBP: 0000000000000005 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffffc900049a7828
R13: ffffc900049a7820 R14: ffff88803bacbcc0 R15: ffff88803bacaa00
 unlink_file_vma_batch_add+0xdc/0x1f0 mm/vma.c:1792
 free_pgtables+0x218/0xbc0 mm/memory.c:415
 exit_mmap+0x3bd/0xae0 mm/mmap.c:1288
 __mmput+0x12a/0x410 kernel/fork.c:1173
 mmput+0x67/0x80 kernel/fork.c:1196
 exec_mmap fs/exec.c:901 [inline]
 begin_new_exec+0x10f0/0x3840 fs/exec.c:1156
 load_elf_binary+0x8f7/0x5110 fs/binfmt_elf.c:1010
 search_binary_handler fs/exec.c:1669 [inline]
 exec_binprm fs/exec.c:1701 [inline]
 bprm_execve fs/exec.c:1753 [inline]
 bprm_execve+0x8fb/0x1620 fs/exec.c:1729
 do_execveat_common.isra.0+0x4dc/0x5b0 fs/exec.c:1859
 do_execve fs/exec.c:1933 [inline]
 __do_sys_execve fs/exec.c:2009 [inline]
 __se_sys_execve fs/exec.c:2004 [inline]
 __x64_sys_execve+0x8e/0xb0 fs/exec.c:2004
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9235801107
Code: Unable to access opcode bytes at 0x7f92358010dd.
RSP: 002b:00007fffd80721b8 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 000055ae3ebcae88 RCX: 00007f9235801107
RDX: 000055ae3ebcaea8 RSI: 000055ae3ebcae88 RDI: 000055ae3ebcaf30
RBP: 000055ae3ebcaf30 R08: 00007fffd8076e24 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 000055ae3ebcaea8
R13: 00007f92359c6e8b R14: 000055ae3ebcaea8 R15: 0000000000000000
 </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 f2 0d d2 0b 	lea    0xbd20df2(%rip),%rdi        # 0xbd20e0f
  1d:	41 56                	push   %r14
  1f:	48 8b 14 dd 60 47 fa 	mov    -0x7405b8a0(,%rbx,8),%rdx
  26:	8b
  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 9c f5 c7 0b 01 	addl   $0x1,0xbc7f59c(%rip)        # 0xbc7f5d3
  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