------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 1 PID: 8049 at lib/refcount.c:25 refcount_warn_saturate+0xff/0x1a0 lib/refcount.c:25
Modules linked in:
CPU: 1 PID: 8049 Comm: syz-executor Not tainted 5.15.185-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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:ffffc90000dd06a8 EFLAGS: 00010246
RAX: a81be7f16f334e00 RBX: 0000000000000002 RCX: ffff8880758b5940
RDX: 0000000000000100 RSI: 0000000000000100 RDI: 0000000000000000
RBP: ffffc90000dd0808 R08: dffffc0000000000 R09: fffff520001ba039
R10: fffff520001ba039 R11: 1ffff920001ba038 R12: ffff88807aef1a80
R13: dffffc0000000000 R14: 0000000000000002 R15: 0000000000000000
FS:  0000555590104500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d17af354e8 CR3: 000000007df9e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __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_crypto_clone_msg+0x91/0x160 net/tipc/crypto.c:1667
 tipc_crypto_xmit+0x1ac5/0x2560 net/tipc/crypto.c:1728
 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:kernel_wait4+0x1/0x270 kernel/exit.c:1718
Code: df e8 b3 41 75 00 44 8b 03 4c 89 f7 4c 89 fe 4c 89 e2 4c 89 e9 5b 41 5c 41 5d 41 5e 41 5f 5d e9 25 fc ff ff 0f 1f 44 00 00 55 <48> 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec e0 00 00
RSP: 0018:ffffc90003dffd90 EFLAGS: 00000246
RAX: ffffffff81480844 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000040000001 RSI: 00007ffeeb8bf57c RDI: 00000000ffffffff
RBP: ffffc90003dfff10 R08: dffffc0000000000 R09: ffffc90003dffde0
R10: 0000000000000000 R11: 0000000000000008 R12: 1ffff920007bffb8
R13: 0000000000000000 R14: 0000000040000001 R15: dffffc0000000000
 __do_sys_wait4 kernel/exit.c:1779 [inline]
 __se_sys_wait4 kernel/exit.c:1775 [inline]
 __x64_sys_wait4+0x130/0x1e0 kernel/exit.c:1775
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fbc9c67bb97
Code: 89 7c 24 10 48 89 4c 24 18 e8 45 1b 03 00 4c 8b 54 24 18 8b 54 24 14 41 89 c0 48 8b 74 24 08 8b 7c 24 10 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 89 44 24 10 e8 95 1b 03 00 8b 44
RSP: 002b:00007ffeeb8bf510 EFLAGS: 00000293 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 00000000000000ca RCX: 00007fbc9c67bb97
RDX: 0000000040000001 RSI: 00007ffeeb8bf57c RDI: 00000000ffffffff
RBP: 00007ffeeb8bf57c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000001388
R13: 00000000000927c0 R14: 0000000000076da0 R15: 00007ffeeb8bf5d0
 </TASK>
----------------
Code disassembly (best guess):
   0:	df e8                	fucomip %st(0),%st
   2:	b3 41                	mov    $0x41,%bl
   4:	75 00                	jne    0x6
   6:	44 8b 03             	mov    (%rbx),%r8d
   9:	4c 89 f7             	mov    %r14,%rdi
   c:	4c 89 fe             	mov    %r15,%rsi
   f:	4c 89 e2             	mov    %r12,%rdx
  12:	4c 89 e9             	mov    %r13,%rcx
  15:	5b                   	pop    %rbx
  16:	41 5c                	pop    %r12
  18:	41 5d                	pop    %r13
  1a:	41 5e                	pop    %r14
  1c:	41 5f                	pop    %r15
  1e:	5d                   	pop    %rbp
  1f:	e9 25 fc ff ff       	jmp    0xfffffc49
  24:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  29:	55                   	push   %rbp
* 2a:	48 89 e5             	mov    %rsp,%rbp <-- trapping instruction
  2d:	41 57                	push   %r15
  2f:	41 56                	push   %r14
  31:	41 55                	push   %r13
  33:	41 54                	push   %r12
  35:	53                   	push   %rbx
  36:	48 83 e4 e0          	and    $0xffffffffffffffe0,%rsp
  3a:	48                   	rex.W
  3b:	81                   	.byte 0x81
  3c:	ec                   	in     (%dx),%al
  3d:	e0 00                	loopne 0x3f