------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff88802f53ec90 object type: timer_list hint: rose_t0timer_expiry+0x0/0x350 net/rose/rose_link.c:-1
WARNING: lib/debugobjects.c:615 at 0x0, CPU#0: syz.1.5916/26917
Modules linked in:
CPU: 0 UID: 0 PID: 26917 Comm: syz.1.5916 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:debug_print_object lib/debugobjects.c:612 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
RIP: 0010:debug_check_no_obj_freed+0x44a/0x550 lib/debugobjects.c:1129
Code: 89 44 24 20 e8 c7 de 92 fd 48 8b 44 24 20 4c 8b 4d 00 4c 89 ef 48 c7 c6 a0 cc bf 8b 48 c7 c2 c0 d1 bf 8b 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:ffffc90000007a70 EFLAGS: 00010246
RAX: ffffffff8a3bda60 RBX: ffffffff99a63d40 RCX: 0000000000000000
RDX: ffffffff8bbfd1c0 RSI: ffffffff8bbfcca0 RDI: ffffffff8f8aa470
RBP: ffffffff8b6d24a0 R08: ffff88802f53ec90 R09: ffffffff8b6d3600
R10: dffffc0000000000 R11: ffffffff81ae6210 R12: ffff88802f53ee00
R13: ffffffff8f8aa470 R14: ffff88802f53e000 R15: ffff88802f53ec90
FS:  0000000000000000(0000) GS:ffff8881260b1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3b4f1156c0 CR3: 0000000033c3a000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 slab_free_hook mm/slub.c:2471 [inline]
 slab_free mm/slub.c:6663 [inline]
 kfree+0x13b/0x660 mm/slub.c:6871
 rose_neigh_put include/net/rose.h:166 [inline]
 rose_timer_expiry+0x4cb/0x600 net/rose/rose_timer.c:183
 call_timer_fn+0x16e/0x590 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers kernel/time/timer.c:2373 [inline]
 __run_timer_base+0x61a/0x860 kernel/time/timer.c:2385
 run_timer_base kernel/time/timer.c:2394 [inline]
 run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2404
 handle_softirqs+0x27d/0x850 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0xc9c/0x2390 arch/x86/kernel/unwind_orc.c:-1
Code: 4c 8b 6c 24 50 4c 8b 64 24 10 74 08 48 89 df e8 5a 34 b3 00 4c 89 23 ba 10 00 00 00 4c 89 ef 31 f6 e8 28 36 b3 00 48 8b 14 24 <e9> c5 04 00 00 4c 89 7c 24 28 48 89 5c 24 78 4d 8d 66 08 4d 89 e5
RSP: 0018:ffffc9000410f398 EFLAGS: 00000246
RAX: ffffc9000410f4b8 RBX: ffffc9000410f4a0 RCX: 0000000000000000
RDX: ffffffff90173d46 RSI: 0000000000000000 RDI: ffffc9000410f4c8
RBP: dffffc0000000000 R08: ffffc9000410f4c7 R09: 0000000000000000
R10: ffffc9000410f4b8 R11: fffff52000821e99 R12: ffffc9000410f5b0
R13: ffffc9000410f4b8 R14: ffffc9000410f468 R15: ffffc9000410f4b0
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587
 kasan_save_free_info mm/kasan/kasan.h:406 [inline]
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2540 [inline]
 slab_free mm/slub.c:6663 [inline]
 kmem_cache_free+0x197/0x620 mm/slub.c:6774
 anon_vma_chain_free mm/rmap.c:146 [inline]
 unlink_anon_vmas+0x614/0x670 mm/rmap.c:446
 free_pgtables+0x72b/0x9c0 mm/memory.c:414
 exit_mmap+0x437/0xb20 mm/mmap.c:1291
 __mmput+0x118/0x430 kernel/fork.c:1130
 exit_mm+0x1da/0x2c0 kernel/exit.c:583
 do_exit+0x658/0x2310 kernel/exit.c:961
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1114
 __do_sys_exit_group kernel/exit.c:1125 [inline]
 __se_sys_exit_group kernel/exit.c:1123 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1123
 x64_sys_call+0x2210/0x2210 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0d9f98f749
Code: Unable to access opcode bytes at 0x7f0d9f98f71f.
RSP: 002b:00007fff8a6f9b98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0d9f98f749
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff8a6f9bfc R08: 0000001e8a6f9c8f R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000219
R13: 00000000000927c0 R14: 0000000000094651 R15: 00007fff8a6f9c50
 </TASK>
----------------
Code disassembly (best guess):
   0:	89 44 24 20          	mov    %eax,0x20(%rsp)
   4:	e8 c7 de 92 fd       	call   0xfd92ded0
   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 a0 cc bf 8b 	mov    $0xffffffff8bbfcca0,%rsi
  1c:	48 c7 c2 c0 d1 bf 8b 	mov    $0xffffffff8bbfd1c0,%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