__sys_sendmmsg+0x195/0x470 net/socket.c:2553
 __do_sys_sendmmsg net/socket.c:2582 [inline]
 __se_sys_sendmmsg net/socket.c:2579 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2579
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
------------[ cut here ]------------
WARNING: CPU: 0 PID: 15196 at lib/ref_tracker.c:38 spin_unlock_irqrestore include/linux/spinlock.h:404 [inline]
WARNING: CPU: 0 PID: 15196 at lib/ref_tracker.c:38 ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:37
Modules linked in:
CPU: 0 PID: 15196 Comm: syz-executor.3 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 dd 7e a9 f8 4c 8b 3c 24 4c 39 fd 49 8b 07 0f 85 b5 00 00 00 e8 28 20 62 f8 48 8b 74 24 10 4c 89 e7 e8 1b 30 36 00 <0f> 0b e9 c7 97 e8 fa 4c 89 ff e8 ac 7e a9 f8 e9 d4 fe ff ff e8 92
RSP: 0000:ffffc9000575fb28 EFLAGS: 00010206
RAX: 0000000000000100 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000101 RSI: 0000000000000101 RDI: 0000000000000001
RBP: ffff8880743db698 R08: 0000000000000001 R09: ffffffff8ffa2ac7
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880743db650
R13: ffff8880743db698 R14: ffff8880743db698 R15: ffff8880743db698
FS:  0000555555ebe400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d721000 CR3: 0000000025112000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __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+0x45/0xc0 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0033:0x7fcd5bf60034
Code: 00 0f 86 14 01 00 00 4c 8d ab 80 00 00 00 48 89 df 4c 89 ee e8 4d fa ff ff 4d 39 ec 74 40 0f 1f 84 00 00 00 00 00 49 8b 4d 00 <49> 8b 55 f8 49 8d 45 f8 48 39 d1 0f 83 f0 00 00 00 0f 1f 00 48 89
RSP: 002b:00007ffe7ad37d30 EFLAGS: 00000206
RAX: 00007fcd5bd2c130 RBX: 00007fcd5bd29008 RCX: ffffffff8402218a
RDX: ffffffff84021ec8 RSI: 00007fcd5bd2c138 RDI: 00007fcd5bd29010
RBP: 00000000000006cd R08: 00007fcd5bd29128 R09: 000000006ef9a235
R10: 00007ffe7ad37f00 R11: 0000000000000246 R12: 00007fcd5bd2c670
R13: 00007fcd5bd2c140 R14: 00007fcd5c0c4ff8 R15: ffffffff8948b511
 </TASK>