------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 1 PID: 15357 at lib/refcount.c:25 refcount_warn_saturate+0xff/0x1a0 lib/refcount.c:25
Modules linked in:
CPU: 1 PID: 15357 Comm: syz.7.2079 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: 0000:ffffc90000dd06a8 EFLAGS: 00010246
RAX: cf9086d83e265300 RBX: 0000000000000002 RCX: ffff88802069d940
RDX: 0000000000000100 RSI: 0000000000000101 RDI: 0000000000000000
RBP: ffffc90000dd0808 R08: dffffc0000000000 R09: fffff520001ba039
R10: fffff520001ba039 R11: 1ffff920001ba038 R12: ffff888079141a80
R13: dffffc0000000000 R14: 0000000000000002 R15: 0000000000000000
FS:  000055556d689500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c38e2d4 CR3: 00000000494e0000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000097 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:native_save_fl arch/x86/include/asm/irqflags.h:35 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:106 [inline]
RIP: 0010:lock_is_held_type+0x64/0x190 kernel/locking/lockdep.c:5662
Code: 00 00 00 65 48 8b 1d 5b 00 61 76 83 bb ec 0a 00 00 00 0f 85 df 00 00 00 41 89 f7 49 89 fe 48 c7 04 24 00 00 00 00 9c 8f 04 24 <4c> 8b 2c 24 fa 48 c7 c7 c0 1f 0b 8a e8 4b 0e 00 00 65 ff 05 64 09
RSP: 0000:ffffc90003fffa58 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88802069d940 RCX: cf9086d83e265300
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff8c11bfa0
RBP: 00000000ffffffff R08: dffffc0000000000 R09: fffff9400039b63f
R10: fffff9400039b63f R11: 1ffffd400039b63e R12: ffff888074afd4a8
R13: 1ffff920007fff80 R14: ffffffff8c11bfa0 R15: 00000000ffffffff
 xa_entry include/linux/xarray.h:1182 [inline]
 xas_reload+0x19c/0x470 include/linux/xarray.h:1558
 next_uptodate_page+0x2a5/0x8b0 mm/filemap.c:3259
 next_map_page mm/filemap.c:3296 [inline]
 filemap_map_pages+0xebd/0x1390 mm/filemap.c:3352
 do_fault_around mm/memory.c:4243 [inline]
 do_read_fault mm/memory.c:4258 [inline]
 do_fault mm/memory.c:4392 [inline]
 handle_pte_fault mm/memory.c:4650 [inline]
 __handle_mm_fault mm/memory.c:4785 [inline]
 handle_mm_fault+0x2580/0x43c0 mm/memory.c:4883
 do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1357
 handle_page_fault arch/x86/mm/fault.c:1445 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7f0459f6bc8d
Code: ff 48 83 e8 01 48 89 ee bf 01 00 00 00 48 c1 e0 0e 48 c1 ee 06 48 01 c8 48 89 e9 81 e6 ff 3f 00 00 48 c1 e9 03 83 e1 07 d3 e7 <40> 84 bc 06 20 20 00 00 0f 85 11 fd ff ff e9 c0 fd ff ff e8 7b 2b
RSP: 002b:00007ffffaf5b510 EFLAGS: 00010202
RAX: 000000110c38c000 RBX: 00007f045ade2720 RCX: 0000000000000006
RDX: 0000000000000d30 RSI: 00000000000002b4 RDI: 0000000000000040
RBP: ffffffff8400ad30 R08: 00007f045a2b3038 R09: 00007f045a29f000
R10: 00007f04596fc008 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8400a169 R15: 000000000000116e
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 65 48             	add    %ah,0x48(%rbp)
   5:	8b 1d 5b 00 61 76    	mov    0x7661005b(%rip),%ebx        # 0x76610066
   b:	83 bb ec 0a 00 00 00 	cmpl   $0x0,0xaec(%rbx)
  12:	0f 85 df 00 00 00    	jne    0xf7
  18:	41 89 f7             	mov    %esi,%r15d
  1b:	49 89 fe             	mov    %rdi,%r14
  1e:	48 c7 04 24 00 00 00 	movq   $0x0,(%rsp)
  25:	00
  26:	9c                   	pushf
  27:	8f 04 24             	pop    (%rsp)
* 2a:	4c 8b 2c 24          	mov    (%rsp),%r13 <-- trapping instruction
  2e:	fa                   	cli
  2f:	48 c7 c7 c0 1f 0b 8a 	mov    $0xffffffff8a0b1fc0,%rdi
  36:	e8 4b 0e 00 00       	call   0xe86
  3b:	65                   	gs
  3c:	ff                   	.byte 0xff
  3d:	05                   	.byte 0x5
  3e:	64                   	fs
  3f:	09                   	.byte 0x9