syzbot

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ODEBUG: free active (active state 0) object: ffff8880527f8890 object type: timer_list hint: rose_t0timer_expiry+0x0/0x150 include/linux/skbuff.h:2927
WARNING: CPU: 1 PID: 17542 at lib/debugobjects.c:612 debug_print_object+0x1a2/0x2b0 lib/debugobjects.c:612
Modules linked in:
CPU: 1 UID: 0 PID: 17542 Comm: rm Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:debug_print_object+0x1a2/0x2b0 lib/debugobjects.c:612
Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 54 41 56 48 8b 14 dd 20 f5 f1 8b 4c 89 e6 48 c7 c7 a0 e9 f1 8b e8 6f 53 c9 fc 90 <0f> 0b 90 90 58 83 05 56 79 d1 0b 01 48 83 c4 18 5b 5d 41 5c 41 5d
RSP: 0018:ffffc90000a08a18 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffff817b7ee8
RDX: ffff888026799e40 RSI: ffffffff817b7ef5 RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff8bf1f040
R13: ffffffff8b901fe0 R14: ffffffff8a533a20 R15: ffffc90000a08b18
FS:  00007fe1a565dc80(0000) GS:ffff888124ad2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe1a579cf50 CR3: 0000000056372000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
 debug_check_no_obj_freed+0x4b7/0x600 lib/debugobjects.c:1129
 slab_free_hook mm/slub.c:2461 [inline]
 slab_free mm/slub.c:6619 [inline]
 kfree+0x291/0x6d0 mm/slub.c:6826
 rose_neigh_put include/net/rose.h:166 [inline]
 rose_timer_expiry+0x53f/0x630 net/rose/rose_timer.c:183
 call_timer_fn+0x19a/0x620 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1798 [inline]
 __run_timers+0x6ef/0x960 kernel/time/timer.c:2372
 __run_timer_base kernel/time/timer.c:2384 [inline]
 __run_timer_base kernel/time/timer.c:2376 [inline]
 run_timer_base+0x114/0x190 kernel/time/timer.c:2393
 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403
 handle_softirqs+0x219/0x8e0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:crng_make_state+0x2b5/0x6d0 drivers/char/random.c:394
Code: fc 4d 85 ed 0f 85 cf 01 00 00 e8 d6 2b 8a fc 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 34 27 8a fc 48 85 db 0f 85 59 02 00 00 <48> 83 c4 20 5b 5d 41 5c 41 5d 41 5e 41 5f e9 a8 2b 8a fc e8 a3 2b
RSP: 0018:ffffc9000d8c7c90 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff85332010
RDX: ffff888026799e40 RSI: ffffffff8533201e RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 00000000a2a9d179 R12: ffff8880b85367f0
R13: 0000000000000200 R14: 0000000000000020 R15: 0000000000000027
 get_random_bytes_user+0xe3/0x3c0 drivers/char/random.c:456
 __do_sys_getrandom drivers/char/random.c:1416 [inline]
 __se_sys_getrandom drivers/char/random.c:1390 [inline]
 __x64_sys_getrandom+0x183/0x290 drivers/char/random.c:1390
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe1a57bbed5
Code: ff 0f 1f 40 00 55 ba 01 00 00 00 be 08 00 00 00 b8 3e 01 00 00 53 48 8d 3d 70 23 14 00 48 83 ec 18 c6 05 75 23 14 00 01 0f 05 <48> 89 e3 48 83 f8 08 74 4d 48 89 de bf 01 00 00 00 e8 b5 a4 03 00
RSP: 002b:00007ffc517013f0 EFLAGS: 00000206 ORIG_RAX: 000000000000013e
RAX: ffffffffffffffda RBX: 00000000000001d8 RCX: 00007fe1a57bbed5
RDX: 0000000000000001 RSI: 0000000000000008 RDI: 00007fe1a58fe238
RBP: 0000000000000003 R08: 00007fe1a5a05af8 R09: 0000000000000000
R10: 00007ffc517011e0 R11: 0000000000000206 R12: 00007fe1a56f22e2
R13: 00007fe1a56f23ae R14: 0000000000000001 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	fc                   	cld
   1:	4d 85 ed             	test   %r13,%r13
   4:	0f 85 cf 01 00 00    	jne    0x1d9
   a:	e8 d6 2b 8a fc       	call   0xfc8a2be5
   f:	9c                   	pushf
  10:	5b                   	pop    %rbx
  11:	81 e3 00 02 00 00    	and    $0x200,%ebx
  17:	31 ff                	xor    %edi,%edi
  19:	48 89 de             	mov    %rbx,%rsi
  1c:	e8 34 27 8a fc       	call   0xfc8a2755
  21:	48 85 db             	test   %rbx,%rbx
  24:	0f 85 59 02 00 00    	jne    0x283
* 2a:	48 83 c4 20          	add    $0x20,%rsp <-- trapping instruction
  2e:	5b                   	pop    %rbx
  2f:	5d                   	pop    %rbp
  30:	41 5c                	pop    %r12
  32:	41 5d                	pop    %r13
  34:	41 5e                	pop    %r14
  36:	41 5f                	pop    %r15
  38:	e9 a8 2b 8a fc       	jmp    0xfc8a2be5
  3d:	e8                   	.byte 0xe8
  3e:	a3                   	.byte 0xa3
  3f:	2b                   	.byte 0x2b