syzbot

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ODEBUG: free active (active state 0) object: ffff88805d773c90 object type: timer_list hint: rose_t0timer_expiry+0x0/0x350
WARNING: CPU: 1 PID: 0 at lib/debugobjects.c:518 debug_print_object lib/debugobjects.c:515 [inline]
WARNING: CPU: 1 PID: 0 at lib/debugobjects.c:518 __debug_check_no_obj_freed lib/debugobjects.c:990 [inline]
WARNING: CPU: 1 PID: 0 at lib/debugobjects.c:518 debug_check_no_obj_freed+0x446/0x540 lib/debugobjects.c:1020
Modules linked in:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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 60 93 1c 8b 48 c7 c6 c0 8f 1c 8b 48 c7 c2 e0 94 1c 8b 8b 0c 24 4d 89 f8 41 55 e8 8e 91 1f fd 48 83 c4 08 <0f> 0b 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc ff df ff 05 b3 f0 59
RSP: 0018:ffffc900001f0a50 EFLAGS: 00010296
RAX: 5d3b50cd457f6b00 RBX: ffffffff9752d258 RCX: ffff88801a273c00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffffff8accac00 R08: ffffc900001f0647 R09: 1ffff9200003e0c8
R10: dffffc0000000000 R11: fffff5200003e0c9 R12: ffff88805d773e00
R13: ffffffff897ac5a0 R14: ffff88805d773000 R15: ffff88805d773c90
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5c85385980 CR3: 00000000763e1000 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:steal_cookie_task kernel/sched/core.c:6361 [inline]
RIP: 0010:sched_core_balance+0xa8c/0xff0 kernel/sched/core.c:6380
Code: 00 48 8b 7c 24 28 e8 c3 be 30 09 e9 53 02 00 00 4c 8b 64 24 20 48 8b 7c 24 30 e8 af be 30 09 e8 0a a3 2e 00 fb 80 7c 24 18 00 <4c> 8b 74 24 50 0f 85 5a 03 00 00 ff c3 83 e3 0f 4c 39 fb 0f 86 50
RSP: 0018:ffffc900001879c0 EFLAGS: 00000246
RAX: 5d3b50cd457f6b00 RBX: 0000000000000000 RCX: 5d3b50cd457f6b00
RDX: dffffc0000000000 RSI: ffffffff8acac9e0 RDI: ffffffff8b1c89a0
RBP: ffffc90000187b48 R08: ffffffff8e8b02af R09: 1ffffffff1d16055
R10: dffffc0000000000 R11: fffffbfff1d16056 R12: ffff88801a257d30
R13: dffffc0000000000 R14: ffff8880b8e3c000 R15: 0000000000000002
 do_balance_callbacks kernel/sched/core.c:5024 [inline]
 __balance_callbacks kernel/sched/core.c:5078 [inline]
 finish_lock_switch kernel/sched/core.c:5134 [inline]
 finish_task_switch+0x395/0x8f0 kernel/sched/core.c:5253
 context_switch kernel/sched/core.c:5384 [inline]
 __schedule+0x155b/0x45a0 kernel/sched/core.c:6700
 schedule_idle+0x4e/0x80 kernel/sched/core.c:6802
 do_idle+0x539/0x590 kernel/sched/idle.c:331
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:401
 start_secondary+0xee/0xf0 arch/x86/kernel/smpboot.c:323
 secondary_startup_64_no_verify+0x179/0x17b
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 48 8b             	add    %cl,-0x75(%rax)
   3:	7c 24                	jl     0x29
   5:	28 e8                	sub    %ch,%al
   7:	c3                   	ret
   8:	be 30 09 e9 53       	mov    $0x53e90930,%esi
   d:	02 00                	add    (%rax),%al
   f:	00 4c 8b 64          	add    %cl,0x64(%rbx,%rcx,4)
  13:	24 20                	and    $0x20,%al
  15:	48 8b 7c 24 30       	mov    0x30(%rsp),%rdi
  1a:	e8 af be 30 09       	call   0x930bece
  1f:	e8 0a a3 2e 00       	call   0x2ea32e
  24:	fb                   	sti
  25:	80 7c 24 18 00       	cmpb   $0x0,0x18(%rsp)
* 2a:	4c 8b 74 24 50       	mov    0x50(%rsp),%r14 <-- trapping instruction
  2f:	0f 85 5a 03 00 00    	jne    0x38f
  35:	ff c3                	inc    %ebx
  37:	83 e3 0f             	and    $0xf,%ebx
  3a:	4c 39 fb             	cmp    %r15,%rbx
  3d:	0f                   	.byte 0xf
  3e:	86                   	.byte 0x86
  3f:	50                   	push   %rax