------------[ cut here ]------------
WARNING: CPU: 0 PID: 8327 at net/ipv4/tcp.c:1661 tcp_recvmsg+0x6f2/0x2d10 net/ipv4/tcp.c:1661()
TCP recvmsg seq # bug: copied 2523058, seq 2A472DE, rcvnxt 2A572A9, fl 80000100
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 8327 Comm: syz-executor.2 Not tainted 4.4.174+ #17
 0000000000000000 70174478b3ac7b45 ffff8801d82bf6c8 ffffffff81aad1a1
 ffff8801d82bf818 ffffffff82835ee0 ffffffff82a85940 000000000000067d
 ffffffff823f3402 ffff8801d82bf7a8 ffffffff813a48c2 0000000041b58ab3
Call Trace:
 [<ffffffff81aad1a1>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81aad1a1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff813a48c2>] panic+0x1b9/0x37b kernel/panic.c:112
 [<ffffffff813a4ab9>] warn_slowpath_common kernel/panic.c:455 [inline]
 [<ffffffff813a4ab9>] warn_slowpath_common.cold+0x20/0x20 kernel/panic.c:435
 [<ffffffff810d394f>] warn_slowpath_fmt+0xbf/0x100 kernel/panic.c:471
 [<ffffffff823f3402>] tcp_recvmsg+0x6f2/0x2d10 net/ipv4/tcp.c:1661
 [<ffffffff824a86ae>] inet_recvmsg+0x23e/0x4d0 net/ipv4/af_inet.c:786
 [<ffffffff821d8d9f>] sock_recvmsg_nosec net/socket.c:740 [inline]
 [<ffffffff821d8d9f>] sock_recvmsg net/socket.c:748 [inline]
 [<ffffffff821d8d9f>] sock_recvmsg+0x8f/0xc0 net/socket.c:743
 [<ffffffff821da5e7>] ___sys_recvmsg+0x257/0x530 net/socket.c:2129
 [<ffffffff821dd5b5>] __sys_recvmsg+0xc5/0x160 net/socket.c:2175
 [<ffffffff822ace5a>] C_SYSC_recvmsg net/compat.c:737 [inline]
 [<ffffffff822ace5a>] compat_SyS_recvmsg+0x2a/0x40 net/compat.c:735
 [<ffffffff8100603d>] do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
 [<ffffffff8100603d>] do_fast_syscall_32+0x32d/0xa90 arch/x86/entry/common.c:397
 [<ffffffff8271a350>] sysenter_flags_fixed+0xd/0x1a
Kernel Offset: disabled
Rebooting in 86400 seconds..