------------[ 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: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] panic+0x1bf/0x39f kernel/panic.c:179 [] __warn.cold.8+0x2f/0x2f kernel/panic.c:542 [] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585 [] tcp_close+0xced/0x1070 net/ipv4/tcp.c:2193 [] inet_release+0xff/0x1d0 net/ipv4/af_inet.c:434 [] inet6_release+0x50/0x70 net/ipv6/af_inet6.c:440 [] __sock_release+0xd7/0x260 net/socket.c:605 [] sock_close+0x19/0x20 net/socket.c:1059 [] __fput+0x263/0x700 fs/file_table.c:208 [] ____fput+0x15/0x20 fs/file_table.c:244 [] task_work_run+0x10c/0x180 kernel/task_work.c:116 [] tracehook_notify_resume include/linux/tracehook.h:191 [inline] [] exit_to_usermode_loop+0x129/0x150 arch/x86/entry/common.c:162 [] prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] [] syscall_return_slowpath arch/x86/entry/common.c:263 [inline] [] do_syscall_64+0x3e2/0x550 arch/x86/entry/common.c:290 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Kernel Offset: disabled Rebooting in 86400 seconds..