------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 1 PID: 5318 at lib/refcount.c:25 refcount_warn_saturate+0xff/0x1a0 lib/refcount.c:25
Modules linked in:
CPU: 1 PID: 5318 Comm: kworker/1:18 Not tainted 5.15.185-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events pwq_unbound_release_workfn
RIP: 0010:refcount_warn_saturate+0xff/0x1a0 lib/refcount.c:25
Code: 09 01 48 c7 c7 40 6b 59 8a e8 dd 27 bb 05 0f 0b eb e0 e8 04 42 9c fd c6 05 ae 8f 79 09 01 48 c7 c7 80 6a 59 8a e8 c1 27 bb 05 <0f> 0b eb c4 e8 e8 41 9c fd c6 05 93 8f 79 09 01 48 c7 c7 e0 6a 59
RSP: 0018:ffffc90000dd0848 EFLAGS: 00010246
RAX: 425f9e4853c60b00 RBX: 0000000000000002 RCX: ffff888028a51dc0
RDX: 0000000000000100 RSI: 0000000000000101 RDI: 0000000000000000
RBP: ffffc90000dd09b0 R08: dffffc0000000000 R09: fffff520001ba06d
R10: fffff520001ba06d R11: 1ffff920001ba06c R12: ffff888079603500
R13: dffffc0000000000 R14: 0000000000000002 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7bbb466630 CR3: 00000000630af000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__refcount_add include/linux/refcount.h:-1 [inline]
__refcount_inc include/linux/refcount.h:250 [inline]
refcount_inc include/linux/refcount.h:267 [inline]
get_net include/net/net_namespace.h:252 [inline]
tipc_aead_encrypt net/tipc/crypto.c:832 [inline]
tipc_crypto_xmit+0x1949/0x2560 net/tipc/crypto.c:1772
tipc_bearer_xmit_skb+0x228/0x3c0 net/tipc/bearer.c:574
tipc_disc_timeout+0x568/0x6b0 net/tipc/discover.c:338
call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451
expire_timers kernel/time/timer.c:1496 [inline]
__run_timers+0x525/0x7c0 kernel/time/timer.c:1767
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
handle_softirqs+0x328/0x820 kernel/softirq.c:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:preempt_schedule_irq+0xac/0x150 kernel/sched/core.c:6780
Code: 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 70 bf 01 00 00 00 e8 7f b5 a7 f7 e8 1a 37 d4 f7 fb bf 01 00 00 00 cf b5 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc900025879c0 EFLAGS: 00000282
RAX: 425f9e4853c60b00 RBX: 0000000000000000 RCX: 425f9e4853c60b00
RDX: dffffc0000000000 RSI: ffffffff8a0b11c0 RDI: 0000000000000001
RBP: ffffc90002587a60 R08: dffffc0000000000 R09: fffffbfff1ff361e
R10: fffffbfff1ff361e R11: 1ffffffff1ff361d R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920004b0f38
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:681
RIP: 0010:lockdep_unregister_key+0x4ae/0x500 kernel/locking/lockdep.c:6334
Code: 48 3b 84 24 80 00 00 00 75 39 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 1e e1 44 08 41 f7 c4 00 02 00 00 74 8b fb 84 db <75> 8a eb 9b 0f 0b e9 58 ff ff ff 0f 0b e9 c4 fe ff ff 0f 0b e9 11
RSP: 0018:ffffc90002587b20 EFLAGS: 00000246
RAX: 425f9e4853c60b00 RBX: 0000000000000000 RCX: 425f9e4853c60b00
RDX: 0000000000000001 RSI: ffffffff8a0b1fc0 RDI: ffffffff8a59a740
RBP: ffffc90002587bf0 R08: dffffc0000000000 R09: fffffbfff1fe9739
R10: fffffbfff1fe9739 R11: 1ffffffff1fe9738 R12: 0000000000000206
R13: ffff8880601ec929 R14: ffffffff8ff4b018 R15: 1ffff920004b0f68
wq_unregister_lockdep kernel/workqueue.c:3518 [inline]
pwq_unbound_release_workfn+0x262/0x2b0 kernel/workqueue.c:3756
process_one_work+0x863/0x1000 kernel/workqueue.c:2310
worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
----------------
Code disassembly (best guess):
0: 44 24 20 rex.R and $0x20,%al
3: f6 44 24 21 02 testb $0x2,0x21(%rsp)
8: 74 0b je 0x15
a: 0f 0b ud2
c: 48 f7 03 08 00 00 00 testq $0x8,(%rbx)
13: 74 70 je 0x85
15: bf 01 00 00 00 mov $0x1,%edi
1a: e8 7f b5 a7 f7 call 0xf7a7b59e
1f: e8 1a 37 d4 f7 call 0xf7d4373e
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 cf b5 ff ff call 0xffffb5fe <-- trapping instruction
2f: 48 c7 44 24 40 00 00 movq $0x0,0x40(%rsp)
36: 00 00
38: 9c pushf
39: 8f 44 24 40 pop 0x40(%rsp)
3d: 8b .byte 0x8b
3e: 44 rex.R
3f: 24 .byte 0x24