------------[ cut here ]------------
WARNING: CPU: 1 PID: 26796 at net/ipv4/tcp.c:2193 tcp_close+0xd1e/0x10b0 net/ipv4/tcp.c:2193
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 26796 Comm: syz-executor.0 Not tainted 4.9.189+ #3
 ffff8801c5077b90 ffffffff81b65c01 0000000000000000 ffffffff82a3b1c0
 00000000ffffffff 0000000000000001 0000000000000009 ffff8801c5077c70
 ffffffff813feb5a 0000000041b58ab3 ffffffff82e3260d ffffffff813fe981
Call Trace:
 [<000000000fd968d2>] __dump_stack lib/dump_stack.c:15 [inline]
 [<000000000fd968d2>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<00000000af5519ce>] panic+0x1d9/0x3bd kernel/panic.c:180
 [<00000000dbc762bb>] __warn.cold+0x2f/0x2f kernel/panic.c:546
 [<00000000b6cf84ad>] warn_slowpath_null+0x2d/0x40 kernel/panic.c:589
 [<00000000cdff8bd4>] tcp_close+0xd1e/0x10b0 net/ipv4/tcp.c:2193
 [<000000004bb75dfe>] inet_release+0xf2/0x1c0 net/ipv4/af_inet.c:430
 [<00000000fcac3779>] inet6_release+0x53/0x80 net/ipv6/af_inet6.c:455
 [<000000005a36c229>] __sock_release+0xd3/0x2c0 net/socket.c:605
 [<00000000dd62aa36>] sock_close+0x1b/0x30 net/socket.c:1060
 [<00000000496be85e>] __fput+0x274/0x720 fs/file_table.c:208
 [<000000007d83396e>] ____fput+0x16/0x20 fs/file_table.c:244
 [<000000009794b2c1>] task_work_run+0x108/0x180 kernel/task_work.c:116
 [<00000000d06b722f>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 [<00000000d06b722f>] exit_to_usermode_loop+0x13b/0x160 arch/x86/entry/common.c:163
 [<0000000085b99341>] prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 [<0000000085b99341>] syscall_return_slowpath arch/x86/entry/common.c:266 [inline]
 [<0000000085b99341>] do_syscall_64+0x3ab/0x5c0 arch/x86/entry/common.c:293
 [<00000000efa9972e>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..