------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 0 PID: 4251 at lib/refcount.c:25 refcount_warn_saturate+0xff/0x1a0 lib/refcount.c:25
Modules linked in:
CPU: 0 PID: 4251 Comm: syz-executor Not tainted 6.1.141-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 a0 d2 be 8a e8 ad 30 45 fd 0f 0b eb e0 e8 f4 1d 79 fd c6 05 fa 72 e2 09 01 48 c7 c7 e0 d1 be 8a e8 91 30 45 fd <0f> 0b eb c4 e8 d8 1d 79 fd c6 05 df 72 e2 09 01 48 c7 c7 40 d2 be
RSP: 0018:ffffc90000007828 EFLAGS: 00010246
RAX: 019837ff88757900 RBX: 0000000000000002 RCX: ffff88807b5bd940
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc90000007990 R08: dffffc0000000000 R09: fffff52000000e95
R10: fffff52000000e95 R11: 1ffff92000000e94 R12: ffff888078039c40
R13: dffffc0000000000 R14: 0000000000000002 R15: ffff888023ddf848
FS:  000055557bd0b500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557bd0b808 CR3: 000000005b68b000 CR4: 00000000003506f0
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:257 [inline]
 tipc_aead_encrypt net/tipc/crypto.c:821 [inline]
 tipc_crypto_xmit+0x17a9/0x2300 net/tipc/crypto.c:1761
 tipc_bearer_xmit_skb+0x242/0x3f0 net/tipc/bearer.c:574
 tipc_disc_timeout+0x568/0x6b0 net/tipc/discover.c:338
 call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
 expire_timers kernel/time/timer.c:1549 [inline]
 __run_timers+0x525/0x7c0 kernel/time/timer.c:1820
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:common_nsleep+0x0/0xa0 kernel/time/posix-timers.c:1270
Code: fd ff 31 c0 5b 41 5e c3 89 d9 80 e1 07 80 c1 03 38 c1 7c e5 49 89 fe 48 89 df e8 4b 46 5f 00 4c 89 f7 eb d5 66 0f 1f 44 00 00 <55> 41 57 41 56 41 54 53 49 89 d6 89 f5 89 fb 49 bc 00 00 00 00 00
RSP: 0018:ffffc90003e27e58 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffff88807b5bded8 RCX: dffffc0000000000
RDX: ffffc90003e27ea0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003e27f10 R08: 0000000000989680 R09: fffff520007c4fbe
R10: fffff520007c4fbe R11: 1ffff920007c4fbc R12: ffffffff8a6e2710
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1314 [inline]
 __se_sys_clock_nanosleep+0x2e6/0x370 kernel/time/posix-timers.c:1291
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f67c43c11e5
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007fffbd74f770 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 0000000000000382 RCX: 00007f67c43c11e5
RDX: 00007fffbd74f7b0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fffbd74f81c R08: 0000000000000000 R09: 000a05a9ae0293a4
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000141
R13: 00000000000927c0 R14: 000000000006ea3b R15: 00007fffbd74f870
 </TASK>
----------------
Code disassembly (best guess):
   0:	fd                   	std
   1:	ff 31                	push   (%rcx)
   3:	c0 5b 41 5e          	rcrb   $0x5e,0x41(%rbx)
   7:	c3                   	ret
   8:	89 d9                	mov    %ebx,%ecx
   a:	80 e1 07             	and    $0x7,%cl
   d:	80 c1 03             	add    $0x3,%cl
  10:	38 c1                	cmp    %al,%cl
  12:	7c e5                	jl     0xfffffff9
  14:	49 89 fe             	mov    %rdi,%r14
  17:	48 89 df             	mov    %rbx,%rdi
  1a:	e8 4b 46 5f 00       	call   0x5f466a
  1f:	4c 89 f7             	mov    %r14,%rdi
  22:	eb d5                	jmp    0xfffffff9
  24:	66 0f 1f 44 00 00    	nopw   0x0(%rax,%rax,1)
* 2a:	55                   	push   %rbp <-- trapping instruction
  2b:	41 57                	push   %r15
  2d:	41 56                	push   %r14
  2f:	41 54                	push   %r12
  31:	53                   	push   %rbx
  32:	49 89 d6             	mov    %rdx,%r14
  35:	89 f5                	mov    %esi,%ebp
  37:	89 fb                	mov    %edi,%ebx
  39:	49                   	rex.WB
  3a:	bc 00 00 00 00       	mov    $0x0,%esp