------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 1 PID: 8605 at lib/refcount.c:25 refcount_warn_saturate+0xf3/0x1b0 lib/refcount.c:25
Modules linked in:
CPU: 1 PID: 8605 Comm: rm Not tainted 6.6.93-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:refcount_warn_saturate+0xf3/0x1b0 lib/refcount.c:25
Code: 15 0a 01 0f 85 98 00 00 00 e8 39 41 66 fd 5b 41 5e c3 e8 30 41 66 fd c6 05 e1 00 15 0a 01 48 c7 c7 40 0f fc 8a e8 0d a5 30 fd <0f> 0b eb e0 e8 14 41 66 fd c6 05 c6 00 15 0a 01 48 c7 c7 a0 0f fc
RSP: 0018:ffffc900001f0848 EFLAGS: 00010246
RAX: cfb825ea69ab8f00 RBX: 0000000000000002 RCX: ffff88802a0f9e00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc900001f09d0 R08: ffffc900001f0447 R09: 1ffff9200003e088
R10: dffffc0000000000 R11: fffff5200003e089 R12: ffff88802fbf1d40
R13: dffffc0000000000 R14: ffff88802fbf1e94 R15: ffff88806ce1ac00
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc7e34c7eb8 CR3: 00000000613a7000 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:261 [inline]
 tipc_aead_encrypt net/tipc/crypto.c:821 [inline]
 tipc_crypto_xmit+0x17cf/0x2250 net/tipc/crypto.c:1761
 tipc_bearer_xmit_skb+0x246/0x3f0 net/tipc/bearer.c:572
 tipc_disc_timeout+0x581/0x6d0 net/tipc/discover.c:338
 call_timer_fn+0x16e/0x530 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1751 [inline]
 __run_timers+0x52d/0x7d0 kernel/time/timer.c:2022
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:212
Code: 00 0f 0b 0f 1f 80 00 00 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d bc 12 c4 0c 48 89 de 5b e9 53 d4 57 00 cc cc cc <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0d 10 23 7e 7e 65 8b 15 11 23 7e
RSP: 0018:ffffc900034b7450 EFLAGS: 00000293
RAX: ffffffff8a53538e RBX: 000000000000000e RCX: 0000000000000000
RDX: ffff88802a0f9e00 RSI: 000000000000000e RDI: 0000000000000002
RBP: ffffc900034b7580 R08: ffff88802a0f9e00 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000000 R12: ffffc900034b7590
R13: dffffc0000000000 R14: ffff88802ecedc00 R15: 0000000000000002
 mas_next_slot+0x5ec/0x980 lib/maple_tree.c:4641
 vma_next include/linux/mm.h:956 [inline]
 validate_mm+0x302/0x420 mm/mmap.c:288
 __split_vma+0xa26/0xb90 mm/mmap.c:2415
 do_vmi_align_munmap+0x377/0x1660 mm/mmap.c:2504
 do_vmi_munmap+0x252/0x2d0 mm/mmap.c:2650
 __mmap_region mm/mmap.c:2700 [inline]
 mmap_region+0x720/0x1f80 mm/mmap.c:2931
 do_mmap+0x8d1/0xfd0 mm/mmap.c:1381
 vm_mmap_pgoff+0x1c0/0x400 mm/util.c:556
 ksys_mmap_pgoff+0x520/0x700 mm/mmap.c:1427
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc7e37aa242
Code: 08 00 04 00 00 eb e2 90 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 33 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5e 5b 5d c3 0f 1f 00 c7 05 46 40 01 00 16 00
RSP: 002b:00007ffd95522358 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fc7e34b7000 RCX: 00007fc7e37aa242
RDX: 0000000000000003 RSI: 0000000000002000 RDI: 00007fc7e34b7000
RBP: 0000000000000812 R08: 0000000000000003 R09: 000000000002c000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffd95522418
R13: 00007fc7e3787ab0 R14: 00007ffd955227d0 R15: 00000fffb2aa446e
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	0f 0b                	ud2
   2:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
   9:	f3 0f 1e fa          	endbr64
   d:	53                   	push   %rbx
   e:	48 89 fb             	mov    %rdi,%rbx
  11:	e8 13 00 00 00       	call   0x29
  16:	48 8b 3d bc 12 c4 0c 	mov    0xcc412bc(%rip),%rdi        # 0xcc412d9
  1d:	48 89 de             	mov    %rbx,%rsi
  20:	5b                   	pop    %rbx
  21:	e9 53 d4 57 00       	jmp    0x57d479
  26:	cc                   	int3
  27:	cc                   	int3
  28:	cc                   	int3
* 29:	f3 0f 1e fa          	endbr64 <-- trapping instruction
  2d:	48 8b 04 24          	mov    (%rsp),%rax
  31:	65 48 8b 0d 10 23 7e 	mov    %gs:0x7e7e2310(%rip),%rcx        # 0x7e7e2349
  38:	7e
  39:	65                   	gs
  3a:	8b                   	.byte 0x8b
  3b:	15                   	.byte 0x15
  3c:	11 23                	adc    %esp,(%rbx)
  3e:	7e                   	.byte 0x7e