------------[ cut here ]------------
WARNING: CPU: 0 PID: 21474 at net/ipv4/tcp.c:2193 tcp_close+0xced/0x1070 net/ipv4/tcp.c:2193
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 21474 Comm: syz-executor.0 Not tainted 4.9.141+ #1
 ffff8801c204fbc0 ffffffff81b42e79 ffffffff82a38ce0 00000000ffffffff
 ffffffff82ca3800 0000000000000000 0000000000000009 ffff8801c204fc80
 ffffffff813f7125 0000000041b58ab3 ffffffff82e2b62b ffffffff813f6f66
Call Trace:
 [<ffffffff81b42e79>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b42e79>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff813f7125>] panic+0x1bf/0x39f kernel/panic.c:179
 [<ffffffff813f7362>] __warn.cold.8+0x2f/0x2f kernel/panic.c:542
 [<ffffffff810dc02c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff824e662d>] tcp_close+0xced/0x1070 net/ipv4/tcp.c:2193
 [<ffffffff8259329f>] inet_release+0xff/0x1d0 net/ipv4/af_inet.c:434
 [<ffffffff8268b0b0>] inet6_release+0x50/0x70 net/ipv6/af_inet6.c:440
 [<ffffffff8229bdd7>] __sock_release+0xd7/0x260 net/socket.c:605
 [<ffffffff8229bf79>] sock_close+0x19/0x20 net/socket.c:1059
 [<ffffffff81510293>] __fput+0x263/0x700 fs/file_table.c:208
 [<ffffffff815107b5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8113dc4c>] task_work_run+0x10c/0x180 kernel/task_work.c:116
 [<ffffffff81003e49>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 [<ffffffff81003e49>] exit_to_usermode_loop+0x129/0x150 arch/x86/entry/common.c:162
 [<ffffffff81005932>] prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 [<ffffffff81005932>] syscall_return_slowpath arch/x86/entry/common.c:263 [inline]
 [<ffffffff81005932>] do_syscall_64+0x3e2/0x550 arch/x86/entry/common.c:290
 [<ffffffff82817893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..