------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 1 PID: 4374 at lib/refcount.c:25 refcount_warn_saturate+0xff/0x1a0 lib/refcount.c:25
Modules linked in:
CPU: 1 PID: 4374 Comm: udevd 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:ffffc900001e0828 EFLAGS: 00010246
RAX: fff562a292a19c00 RBX: 0000000000000002 RCX: ffff88802d0abb80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc900001e0990 R08: dffffc0000000000 R09: fffff5200003c095
R10: fffff5200003c095 R11: 1ffff9200003c094 R12: ffff88807b401c40
R13: dffffc0000000000 R14: 0000000000000002 R15: ffff888056220848
FS:  00007fde3129c880(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc644bfef98 CR3: 0000000077335000 CR4: 00000000003506e0
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:strscpy+0x64/0x1c0 lib/string.c:234
Code: 45 31 ed 49 83 ff 08 0f 83 94 00 00 00 4c 01 eb 4d 01 ec 45 31 f6 4d 39 f7 0f 84 ca 00 00 00 4b 8d 3c 34 48 89 f8 48 c1 e8 03 <0f> b6 04 10 84 c0 75 29 43 0f b6 2c 34 4a 8d 3c 33 48 89 f8 48 c1
RSP: 0018:ffffc90004a9f500 EFLAGS: 00000a03
RAX: 1ffff11005a15886 RBX: ffff88801bd6b160 RCX: ffff88802d0abb80
RDX: dffffc0000000000 RSI: ffff88802d0ac430 RDI: ffff88802d0ac435
RBP: 0000000000000064 R08: ffffffff8f7cd048 R09: ffffffff8f7cd058
R10: ffffffff8f7cd050 R11: ffffffff8f7cd043 R12: ffff88802d0ac430
R13: 0000000000000000 R14: 0000000000000005 R15: 0000000000000006
 strscpy include/linux/fortify-string.h:274 [inline]
 __set_page_owner_handle+0x22f/0x3c0 mm/page_owner.c:175
 __set_page_owner+0x41/0x60 mm/page_owner.c:195
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532
 prep_new_page mm/page_alloc.c:2539 [inline]
 get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328
 __alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5614
 alloc_slab_page+0x5d/0x160 mm/slub.c:1794
 allocate_slab mm/slub.c:1939 [inline]
 new_slab+0x87/0x2c0 mm/slub.c:1992
 ___slab_alloc+0xbc6/0x1220 mm/slub.c:3180
 __slab_alloc mm/slub.c:3279 [inline]
 slab_alloc_node mm/slub.c:3364 [inline]
 __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3437
 __do_kmalloc_node mm/slab_common.c:935 [inline]
 __kmalloc+0xa0/0x240 mm/slab_common.c:949
 kmalloc include/linux/slab.h:568 [inline]
 tomoyo_realpath_from_path+0xdf/0x5d0 security/tomoyo/realpath.c:251
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x1fd/0x550 security/tomoyo/file.c:822
 security_inode_getattr+0xcf/0x120 security/security.c:1361
 vfs_getattr+0x26/0x3a0 fs/stat.c:158
 vfs_fstat fs/stat.c:183 [inline]
 __do_sys_newfstat fs/stat.c:447 [inline]
 __se_sys_newfstat fs/stat.c:444 [inline]
 __x64_sys_newfstat+0x102/0x1c0 fs/stat.c:444
 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: 0033:0x7fde30b11ad7
Code: 73 01 c3 48 8b 0d 21 f3 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 05 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 f1 f2 0d 00 f7 d8 64 89 02 b8
RSP: 002b:00007ffd8aad7c88 EFLAGS: 00000207 ORIG_RAX: 0000000000000005
RAX: ffffffffffffffda RBX: 0000559d2bd56af0 RCX: 00007fde30b11ad7
RDX: 0000000000000000 RSI: 00007ffd8aad7cf0 RDI: 0000000000000009
RBP: 0000000000000009 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000207 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000009
 </TASK>
----------------
Code disassembly (best guess):
   0:	45 31 ed             	xor    %r13d,%r13d
   3:	49 83 ff 08          	cmp    $0x8,%r15
   7:	0f 83 94 00 00 00    	jae    0xa1
   d:	4c 01 eb             	add    %r13,%rbx
  10:	4d 01 ec             	add    %r13,%r12
  13:	45 31 f6             	xor    %r14d,%r14d
  16:	4d 39 f7             	cmp    %r14,%r15
  19:	0f 84 ca 00 00 00    	je     0xe9
  1f:	4b 8d 3c 34          	lea    (%r12,%r14,1),%rdi
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	0f b6 04 10          	movzbl (%rax,%rdx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	75 29                	jne    0x5b
  32:	43 0f b6 2c 34       	movzbl (%r12,%r14,1),%ebp
  37:	4a 8d 3c 33          	lea    (%rbx,%r14,1),%rdi
  3b:	48 89 f8             	mov    %rdi,%rax
  3e:	48                   	rex.W
  3f:	c1                   	.byte 0xc1