syzbot

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ODEBUG: free active (active state 0) object: ffff88805dcf8090 object type: timer_list hint: rose_t0timer_expiry+0x0/0x350
WARNING: CPU: 1 PID: 13135 at lib/debugobjects.c:518 debug_print_object lib/debugobjects.c:515 [inline]
WARNING: CPU: 1 PID: 13135 at lib/debugobjects.c:518 __debug_check_no_obj_freed lib/debugobjects.c:990 [inline]
WARNING: CPU: 1 PID: 13135 at lib/debugobjects.c:518 debug_check_no_obj_freed+0x446/0x540 lib/debugobjects.c:1020
Modules linked in:
CPU: 1 PID: 13135 Comm: modprobe Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:debug_print_object lib/debugobjects.c:515 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:990 [inline]
RIP: 0010:debug_check_no_obj_freed+0x446/0x540 lib/debugobjects.c:1020
Code: 4c 8b 4d 00 48 c7 c7 a0 8a 1c 8b 48 c7 c6 00 87 1c 8b 48 c7 c2 20 8c 1c 8b 8b 0c 24 4d 89 f8 41 55 e8 3e 56 20 fd 48 83 c4 08 <0f> 0b 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc ff df ff 05 73 8d 5a
RSP: 0018:ffffc900001f0a50 EFLAGS: 00010296
RAX: b1ef02b863f01600 RBX: ffffffff974d6e90 RCX: ffff888028e80000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffffff8accab20 R08: ffffc900001f0647 R09: 1ffff9200003e0c8
R10: dffffc0000000000 R11: fffff5200003e0c9 R12: ffff88805dcf8200
R13: ffffffff89791d80 R14: ffff88805dcf8000 R15: ffff88805dcf8090
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f904473fe9c CR3: 000000000cf32000 CR4: 00000000003506e0
Call Trace:
 <IRQ>
 slab_free_hook mm/slub.c:1786 [inline]
 slab_free_freelist_hook+0xd2/0x1a0 mm/slub.c:1837
 slab_free mm/slub.c:3830 [inline]
 __kmem_cache_free+0xba/0x1e0 mm/slub.c:3843
 rose_neigh_put include/net/rose.h:166 [inline]
 rose_timer_expiry+0x4c6/0x5f0 net/rose/rose_timer.c:183
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x542/0x800 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x10/0x60 kernel/kcov.c:216
Code: 89 fb e8 13 00 00 00 48 8b 3d fc c8 03 0d 48 89 de 5b e9 93 57 57 00 cc cc cc f3 0f 1e fa 48 8b 04 24 65 48 8b 0d 90 a2 7c 7e <65> 8b 15 91 a2 7c 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75
RSP: 0018:ffffc90004d1fd38 EFLAGS: 00000246
RAX: ffffffff8151d1e6 RBX: 0000000000003da8 RCX: ffff888028e80000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90004d1bda8
RBP: ffffc90004d1feb0 R08: ffffffff8e8ad9ef R09: 1ffffffff1d15b3d
R10: dffffc0000000000 R11: fffffbfff1d15b3e R12: dffffc0000000000
R13: 1ffff110051d00aa R14: ffffc90004d18000 R15: ffff888028e80668
 stack_not_used include/linux/sched/task_stack.h:109 [inline]
 check_stack_usage kernel/exit.c:778 [inline]
 do_exit+0x1a66/0x2460 kernel/exit.c:918
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
 __do_sys_exit_group kernel/exit.c:1035 [inline]
 __se_sys_exit_group kernel/exit.c:1033 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1033
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f904489e6c5
Code: Unable to access opcode bytes at 0x7f904489e69b.
RSP: 002b:00007ffec369f9a8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f904499ffe8 RCX: 00007f904489e6c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000001
RBP: 0000000000000001 R08: 00007ffec369f938 R09: 0000000000000000
R10: 00007ffec369f7d0 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f904499e680 R15: 00007f90449a0000
 </TASK>
----------------
Code disassembly (best guess):
   0:	89 fb                	mov    %edi,%ebx
   2:	e8 13 00 00 00       	call   0x1a
   7:	48 8b 3d fc c8 03 0d 	mov    0xd03c8fc(%rip),%rdi        # 0xd03c90a
   e:	48 89 de             	mov    %rbx,%rsi
  11:	5b                   	pop    %rbx
  12:	e9 93 57 57 00       	jmp    0x5757aa
  17:	cc                   	int3
  18:	cc                   	int3
  19:	cc                   	int3
  1a:	f3 0f 1e fa          	endbr64
  1e:	48 8b 04 24          	mov    (%rsp),%rax
  22:	65 48 8b 0d 90 a2 7c 	mov    %gs:0x7e7ca290(%rip),%rcx        # 0x7e7ca2ba
  29:	7e
* 2a:	65 8b 15 91 a2 7c 7e 	mov    %gs:0x7e7ca291(%rip),%edx        # 0x7e7ca2c2 <-- trapping instruction
  31:	81 e2 00 01 ff 00    	and    $0xff0100,%edx
  37:	74 11                	je     0x4a
  39:	81 fa 00 01 00 00    	cmp    $0x100,%edx
  3f:	75                   	.byte 0x75