------------[ cut here ]------------
WARNING: CPU: 0 PID: 10729 at fs/namespace.c:163 mnt_ns_release+0x15d/0x1c0 fs/namespace.c:163
Modules linked in:
CPU: 0 UID: 0 PID: 10729 Comm: syz-executor Not tainted 6.13.0-rc3-next-20241220-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:mnt_ns_release+0x15d/0x1c0 fs/namespace.c:163
Code: 15 bf 01 00 00 00 89 ee e8 d0 e8 7d ff 85 ed 7e 39 e8 87 e4 7d ff 4c 89 ff 5b 41 5e 41 5f 5d e9 39 be d8 ff e8 74 e4 7d ff 90 <0f> 0b 90 e9 12 ff ff ff e8 66 e4 7d ff 48 89 df be 03 00 00 00 5b
RSP: 0018:ffffc90000007bb8 EFLAGS: 00010246
RAX: ffffffff82413fac RBX: 0000000000000001 RCX: ffff888025d63c00
RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffc90000007e10 R08: ffffffff82413eb2 R09: 1ffffffff285af0b
R10: dffffc0000000000 R11: ffffffff82424530 R12: ffffffff81a6a6d7
R13: ffff88805e4b1858 R14: dffffc0000000000 R15: ffff88805e4b1800
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8dec0a5000 CR3: 00000000525fc000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_do_batch kernel/rcu/tree.c:2546 [inline]
 rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2802
 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561
 __do_softirq kernel/softirq.c:595 [inline]
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5853
Code: 2b 00 74 08 4c 89 f7 e8 0a 13 8b 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc9000c69f8e0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff920018d3f28 RCX: ffff888025d646e0
RDX: dffffc0000000000 RSI: ffffffff8c0aaba0 RDI: ffffffff8c5fed00
RBP: ffffc9000c69fa40 R08: ffffffff942d7857 R09: 1ffffffff285af0a
R10: dffffc0000000000 R11: fffffbfff285af0b R12: 1ffff920018d3f24
R13: dffffc0000000000 R14: ffffc9000c69f940 R15: 0000000000000246
 do_write_seqcount_begin_nested include/linux/seqlock.h:476 [inline]
 do_write_seqcount_begin include/linux/seqlock.h:502 [inline]
 write_seqlock include/linux/seqlock.h:876 [inline]
 mnt_ns_tree_write_lock fs/namespace.c:133 [inline]
 mnt_ns_tree_remove fs/namespace.c:182 [inline]
 free_mnt_ns+0xf2/0x210 fs/namespace.c:3916
 free_nsproxy+0x4d/0x3c0 kernel/nsproxy.c:193
 do_exit+0xa2a/0x28e0 kernel/exit.c:937
 do_group_exit+0x207/0x2c0 kernel/exit.c:1087
 get_signal+0x16b2/0x1750 kernel/signal.c:3017
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8a317847df
Code: Unable to access opcode bytes at 0x7f8a317847b5.
RSP: 002b:00007ffee54894f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: 0000000000000001 RBX: 0000000000000005 RCX: 00007f8a317847df
RDX: 0000000000000001 RSI: 00007ffee5489540 RDI: 0000000000000005
RBP: 00007f8a31802d15 R08: 0000000000000000 R09: 00007ffee5489347
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 00007ffee5489540 R14: 00007f8a324a4620 R15: 0000000000000003
 </TASK>
----------------
Code disassembly (best guess):
   0:	2b 00                	sub    (%rax),%eax
   2:	74 08                	je     0xc
   4:	4c 89 f7             	mov    %r14,%rdi
   7:	e8 0a 13 8b 00       	call   0x8b1316
   c:	f6 44 24 61 02       	testb  $0x2,0x61(%rsp)
  11:	0f 85 85 01 00 00    	jne    0x19c
  17:	41 f7 c7 00 02 00 00 	test   $0x200,%r15d
  1e:	74 01                	je     0x21
  20:	fb                   	sti
  21:	48 c7 44 24 40 0e 36 	movq   $0x45e0360e,0x40(%rsp)
  28:	e0 45
* 2a:	4b c7 44 25 00 00 00 	movq   $0x0,0x0(%r13,%r12,1) <-- trapping instruction
  31:	00 00
  33:	43 c7 44 25 09 00 00 	movl   $0x0,0x9(%r13,%r12,1)
  3a:	00 00
  3c:	43                   	rex.XB
  3d:	c7                   	.byte 0xc7
  3e:	44                   	rex.R
  3f:	25                   	.byte 0x25