------------[ cut here ]------------ ODEBUG: free active (active state 0) object: ffff88803c484890 object type: timer_list hint: rose_t0timer_expiry+0x0/0x150 include/linux/skbuff.h:2928 WARNING: lib/debugobjects.c:629 at debug_print_object+0x18e/0x2a0 lib/debugobjects.c:629, CPU#1: syz.9.7623/31016 Modules linked in: CPU: 1 UID: 0 PID: 31016 Comm: syz.9.7623 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:629 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 42 cd e5 0b 41 56 48 8b 14 dd 60 0e 1b 8c 4c 89 e6 <67> 48 0f b9 3a 58 83 05 0c 8e db 0b 01 48 83 c4 18 5b 5d 41 5c 41 RSP: 0000:ffffc90006427968 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffffffff8c1b0da0 RSI: ffffffff8c1b09c0 RDI: ffffffff90e3f730 RBP: 0000000000000001 R08: ffff88803c484890 R09: ffffffff8bb2b900 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c1b09c0 R13: ffffffff8bb2b940 R14: ffffffff8a7b5cb0 R15: ffffc90006427a68 FS: 000055559015b500(0000) GS:ffff8880d6445000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3a3eb1 CR3: 000000004168f000 CR4: 0000000000352ef0 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:1116 [inline] debug_check_no_obj_freed+0x4da/0x630 lib/debugobjects.c:1146 slab_free_hook mm/slub.c:2623 [inline] slab_free mm/slub.c:6168 [inline] kfree+0x38f/0x6b0 mm/slub.c:6486 rose_neigh_put include/net/rose.h:166 [inline] rose_timer_expiry+0x53f/0x630 net/rose/rose_timer.c:183 call_timer_fn+0x19a/0x670 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers+0x757/0xb30 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+0x1eb/0x9e0 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+0x56/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0033:0x7fa2d3255178 Code: 89 01 eb 91 48 8b 54 24 08 48 8d 35 67 d9 1d 00 48 8d 3d 6a d9 1d 00 31 c0 e8 e4 ce ff ff 0f 1f 40 00 53 48 8b 1d 28 2c 3c 00 <45> 31 d2 31 c9 48 8b 17 45 31 db 4c 8d 83 00 00 40 00 48 89 d0 0f RSP: 002b:00007ffd01bf97a0 EFLAGS: 00000202 RAX: 0000000000000004 RBX: 0000001b2ed20000 RCX: 00007fa2d36120c0 RDX: 00007fa2d36120e0 RSI: 0000000000000080 RDI: 00007fa2d3615fb0 RBP: 00007fa2d3615fb0 R08: 00007fa2d3615fa0 R09: 0000000000000000 R10: 00007ffd01bf9900 R11: 0000000000000246 R12: 00007fa2d3615fa0 R13: 0000200000000000 R14: 00007ffd01bf97b8 R15: 00007fa2d3615fa0 ---------------- 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 42 cd e5 0b lea 0xbe5cd42(%rip),%rdi # 0xbe5cd5f 1d: 41 56 push %r14 1f: 48 8b 14 dd 60 0e 1b mov -0x73e4f1a0(,%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 0c 8e db 0b 01 addl $0x1,0xbdb8e0c(%rip) # 0xbdb8e43 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