------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff88803cb29490 object type: timer_list hint: rose_t0timer_expiry+0x0/0x150 include/linux/skbuff.h:2928
WARNING: lib/debugobjects.c:612 at debug_print_object+0x18e/0x2a0 lib/debugobjects.c:612, CPU#0: syz.5.3535/17857
Modules linked in:
CPU: 0 UID: 0 PID: 17857 Comm: syz.5.3535 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 72 78 ee 0b 41 56 48 8b 14 dd 60 ec 1a 8c 4c 89 e6 <67> 48 0f b9 3a 58 83 05 9c 48 e4 0b 01 48 83 c4 18 5b 5d 41 5c 41
RSP: 0000:ffffc90000007a38 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffffffff8c1aeba0 RSI: ffffffff8c1ae7c0 RDI: ffffffff90e333c0
RBP: 0000000000000001 R08: ffff88803cb29490 R09: ffffffff8bb2c880
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c1ae7c0
R13: ffffffff8bb2c8c0 R14: ffffffff8a6eed50 R15: ffffc90000007b38
FS:  0000555582dd9500(0000) GS:ffff8880d638b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d9f9000 CR3: 00000000548a9000 CR4: 0000000000352ef0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
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:2601 [inline]
 slab_free mm/slub.c:6082 [inline]
 kfree+0x343/0x670 mm/slub.c:6399
 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:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data+0x0/0x90 kernel/kcov.c:246
Code: ce 43 02 12 48 8b 80 48 16 00 00 e9 ca bd 7c 09 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <65> 8b 05 b9 43 02 12 49 89 f8 49 89 f1 49 89 d2 65 48 8b 3d 90 43
RSP: 0000:ffffc9000701fb98 EFLAGS: 00000246

RAX: dffffc0000000000 RBX: ffff88803d6d0e50 RCX: ffffffff824df24c
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffea0001988288
R13: ffff88802a6cedc0 R14: 0000000000000000 R15: 0000000000000000
 folio_mapping+0x10c/0x250 mm/util.c:704
 folio_mark_dirty+0x1a/0x200 mm/page-writeback.c:2759
 fault_dirty_shared_page+0x10b/0x690 mm/memory.c:3611
 do_shared_fault mm/memory.c:5882 [inline]
 do_fault+0x447/0x1a00 mm/memory.c:5928
 do_pte_missing mm/memory.c:4469 [inline]
 handle_pte_fault mm/memory.c:6308 [inline]
 __handle_mm_fault+0x180f/0x2b60 mm/memory.c:6446
 handle_mm_fault+0x36d/0xa20 mm/memory.c:6615
 do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1334
 handle_page_fault arch/x86/mm/fault.c:1474 [inline]
 exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1527
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f53e016c909
Code: dd 00 01 74 a3 83 f9 c0 0f 87 59 fe ff ff 62 e1 fe 28 6f 4e 01 48 29 fe 48 83 c7 3f 49 8d 0c 10 48 83 e7 c0 48 01 fe 48 29 f9 <f3> a4 62 c1 fe 28 7f 00 62 c1 fe 28 7f 48 01 c3 0f 1f 80 00 00 00
RSP: 002b:00007ffd2eb9a448 EFLAGS: 00010206
RAX: 0000001b2d9f4770 RBX: 0000000000006da0 RCX: 0000000000002510
RDX: 0000000000006da0 RSI: 00007f53dfc03898 RDI: 0000001b2d9f9000
RBP: 00007f53e0f45720 R08: 0000001b2d9f4770 R09: 0000000000000002
R10: 0000000000000002 R11: ffffffff81763600 R12: 00007f53dfbff008
R13: 000000000000036d R14: 0000000000000004 R15: 0000000000000004
 </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 72 78 ee 0b 	lea    0xbee7872(%rip),%rdi        # 0xbee788f
  1d:	41 56                	push   %r14
  1f:	48 8b 14 dd 60 ec 1a 	mov    -0x73e513a0(,%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 9c 48 e4 0b 01 	addl   $0x1,0xbe4489c(%rip)        # 0xbe448d3
  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