------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 0 PID: 16115 at lib/refcount.c:25 refcount_warn_saturate+0xff/0x1a0 lib/refcount.c:25
Modules linked in:
CPU: 0 PID: 16115 Comm: rm 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:ffffc90000007688 EFLAGS: 00010246
RAX: b64fe048782b8f00 RBX: 0000000000000002 RCX: ffff88802cc75940
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc900000077e8 R08: dffffc0000000000 R09: fffff52000000e61
R10: fffff52000000e61 R11: 1ffff92000000e60 R12: ffff888055b78000
R13: dffffc0000000000 R14: 0000000000000002 R15: ffff888059464048
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fefc2a23e9c CR3: 000000005cc63000 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_crypto_clone_msg+0x91/0x160 net/tipc/crypto.c:1656
 tipc_crypto_xmit+0x1928/0x2300 net/tipc/crypto.c:1717
 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:instrument_atomic_read include/linux/instrumented.h:72 [inline]
RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
RIP: 0010:folio_memcg_lock+0x18b/0x2e0 mm/memcontrol.c:2116
Code: 48 c7 44 24 60 00 00 00 00 9c 8f 44 24 60 f6 44 24 61 02 0f 85 85 00 00 00 41 f7 c5 00 02 00 00 74 01 fb 4d 8d a7 40 09 00 00 <4c> 89 e7 be 04 00 00 00 e8 58 8e f9 ff 4c 89 e0 48 c1 e8 03 48 b9
RSP: 0018:ffffc900060876a0 EFLAGS: 00000206
RAX: b64fe048782b8f00 RBX: ffffea0000297240 RCX: b64fe048782b8f00
RDX: dffffc0000000000 RSI: ffffffff8a6bffe0 RDI: ffffffff8abf1360
RBP: ffffc90006087778 R08: dffffc0000000000 R09: fffffbfff2117049
R10: fffffbfff2117049 R11: 1ffffffff2117048 R12: ffff888140058940
R13: 0000000000000286 R14: ffffffff81d8c155 R15: ffff888140058000
 page_remove_rmap+0x2e/0xea0 mm/rmap.c:1426
 zap_pte_range mm/memory.c:1453 [inline]
 zap_pmd_range mm/memory.c:1574 [inline]
 zap_pud_range mm/memory.c:1603 [inline]
 zap_p4d_range mm/memory.c:1624 [inline]
 unmap_page_range+0x1149/0x2500 mm/memory.c:1645
 unmap_vmas+0x22c/0x330 mm/memory.c:1730
 exit_mmap+0x1cc/0x8e0 mm/mmap.c:3238
 __mmput+0x118/0x3c0 kernel/fork.c:1200
 exit_mm+0x1e6/0x2c0 kernel/exit.c:565
 do_exit+0x8b9/0x2400 kernel/exit.c:858
 do_group_exit+0x217/0x2d0 kernel/exit.c:1021
 __do_sys_exit_group kernel/exit.c:1032 [inline]
 __se_sys_exit_group kernel/exit.c:1030 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1030
 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: 0033:0x7fefc2b826c5
Code: Unable to access opcode bytes at 0x7fefc2b8269b.
RSP: 002b:00007fffdb5b9238 EFLAGS: 00000202
 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fefc2c83fe8 RCX: 00007fefc2b826c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000000
RBP: 0000000000000001 R08: 00007fffdb5b91c8 R09: 0000000000000000
R10: 00007fffdb5b9060 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fefc2c82680 R15: 00007fefc2c84000
 </TASK>
----------------
Code disassembly (best guess):
   0:	48 c7 44 24 60 00 00 	movq   $0x0,0x60(%rsp)
   7:	00 00
   9:	9c                   	pushf
   a:	8f 44 24 60          	pop    0x60(%rsp)
   e:	f6 44 24 61 02       	testb  $0x2,0x61(%rsp)
  13:	0f 85 85 00 00 00    	jne    0x9e
  19:	41 f7 c5 00 02 00 00 	test   $0x200,%r13d
  20:	74 01                	je     0x23
  22:	fb                   	sti
  23:	4d 8d a7 40 09 00 00 	lea    0x940(%r15),%r12
* 2a:	4c 89 e7             	mov    %r12,%rdi <-- trapping instruction
  2d:	be 04 00 00 00       	mov    $0x4,%esi
  32:	e8 58 8e f9 ff       	call   0xfff98e8f
  37:	4c 89 e0             	mov    %r12,%rax
  3a:	48 c1 e8 03          	shr    $0x3,%rax
  3e:	48                   	rex.W
  3f:	b9                   	.byte 0xb9