__sys_sendmsg+0xe5/0x1b0 net/socket.c:2496
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
------------[ cut here ]------------
WARNING: CPU: 1 PID: 3637 at lib/ref_tracker.c:38 spin_unlock_irqrestore include/linux/spinlock.h:404 [inline]
WARNING: CPU: 1 PID: 3637 at lib/ref_tracker.c:38 ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:37
Modules linked in:
CPU: 1 PID: 3637 Comm: syz-executor.0 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:38
Code: 4c 89 ef e8 c3 67 a8 f8 4c 8b 3c 24 4c 39 fd 49 8b 07 0f 85 b5 00 00 00 e8 be 4d 61 f8 48 8b 74 24 10 4c 89 e7 e8 21 4c 36 00 <0f> 0b e9 8d 29 e8 fa 4c 89 ff e8 92 67 a8 f8 e9 d4 fe ff ff e8 78
RSP: 0018:ffffc90000dc0be0 EFLAGS: 00010202
RAX: 0000000000000101 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000102 RSI: 0000000000000102 RDI: 0000000000000001
RBP: ffff888074491c18 R08: 0000000000000001 R09: ffffffff8ffb5b07
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888074491bd0
R13: ffff888074491c18 R14: ffff888074491c18 R15: ffff888074491c18
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0063) knlGS:0000000056d7e380
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7f322bd CR3: 0000000023afe000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __put_net+0x15/0x70 net/core/net_namespace.c:640
 put_net include/net/net_namespace.h:268 [inline]
 put_net_track include/net/net_namespace.h:342 [inline]
 __sk_destruct+0x6d2/0x920 net/core/sock.c:2042
 sk_destruct+0xbd/0xe0 net/core/sock.c:2058
 __sk_free+0xef/0x3d0 net/core/sock.c:2069
 sk_free+0x78/0xa0 net/core/sock.c:2080
 sock_put include/net/sock.h:1912 [inline]
 tcp_write_timer+0x247/0x2b0 net/ipv4/tcp_timer.c:649
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers.part.0+0x67c/0xa30 kernel/time/timer.c:1734
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194
Code: 74 24 10 e8 5a eb 0f f8 48 89 ef e8 12 61 10 f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 <e8> 53 1b 03 f8 65 8b 05 3c a6 b5 76 85 c0 74 0a 5b 5d c3 e8 20 41
RSP: 0018:ffffc900029afc58 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff1b26a71
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff888021aa2f60 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817e0ae8 R11: 0000000000000001 R12: dffffc0000000000
R13: 00000000f7587de0 R14: 0000000000000004 R15: 0000000000000000
 do_wait+0x150/0xce0 kernel/exit.c:1497
 kernel_wait4+0x14c/0x260 kernel/exit.c:1684
 __do_compat_sys_wait4+0x137/0x150 kernel/exit.c:1742
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf6ef6549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f7587d10 EFLAGS: 00000286 ORIG_RAX: 0000000000000072
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00000000f7587de0
RDX: 0000000040000001 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000bb8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	74 24                	je     0x26
   2:	10 e8                	adc    %ch,%al
   4:	5a                   	pop    %rdx
   5:	eb 0f                	jmp    0x16
   7:	f8                   	clc
   8:	48 89 ef             	mov    %rbp,%rdi
   b:	e8 12 61 10 f8       	callq  0xf8106122
  10:	81 e3 00 02 00 00    	and    $0x200,%ebx
  16:	75 25                	jne    0x3d
  18:	9c                   	pushfq
  19:	58                   	pop    %rax
  1a:	f6 c4 02             	test   $0x2,%ah
  1d:	75 2d                	jne    0x4c
  1f:	48 85 db             	test   %rbx,%rbx
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 53 1b 03 f8       	callq  0xf8031b82 <-- trapping instruction
  2f:	65 8b 05 3c a6 b5 76 	mov    %gs:0x76b5a63c(%rip),%eax        # 0x76b5a672
  36:	85 c0                	test   %eax,%eax
  38:	74 0a                	je     0x44
  3a:	5b                   	pop    %rbx
  3b:	5d                   	pop    %rbp
  3c:	c3                   	retq
  3d:	e8                   	.byte 0xe8
  3e:	20                   	.byte 0x20
  3f:	41                   	rex.B