------------[ cut here ]------------
WARNING: CPU: 0 PID: 2260 at net/core/skbuff.c:4353 skb_try_coalesce+0xeb1/0x1270 net/core/skbuff.c:4353
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 2260 Comm: syz-executor415 Not tainted 4.9.125+ #40
 ffff8801b82773d0 ffffffff81af0ae9 ffffffff82838ba0 00000000ffffffff
 0000000000000000 0000000000000000 0000000000001101 ffff8801b8277490
 ffffffff813df095 0000000041b58ab3 ffffffff82c28773 ffffffff813deed6
Call Trace:
 [<ffffffff81af0ae9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81af0ae9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff813df095>] panic+0x1bf/0x39f kernel/panic.c:179
 [<ffffffff813df364>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff810d93cc>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff82250461>] skb_try_coalesce+0xeb1/0x1270 net/core/skbuff.c:4353
 [<ffffffff8246ce79>] tcp_try_coalesce+0x159/0x490 net/ipv4/tcp_input.c:4362
 [<ffffffff8246d2d7>] tcp_queue_rcv+0x127/0x590 net/ipv4/tcp_input.c:4616
 [<ffffffff824834fd>] tcp_data_queue+0x96d/0x38a0 net/ipv4/tcp_input.c:4725
 [<ffffffff8248696d>] tcp_rcv_established+0x53d/0x1ff0 net/ipv4/tcp_input.c:5613
 [<ffffffff826b7ef1>] tcp_v6_do_rcv+0xcd1/0x10e0 net/ipv6/tcp_ipv6.c:1283
 [<ffffffff822317ba>] sk_backlog_rcv include/net/sock.h:871 [inline]
 [<ffffffff822317ba>] __release_sock+0x13a/0x390 net/core/sock.c:2059
 [<ffffffff82237a37>] __sk_flush_backlog+0x27/0x40 net/core/sock.c:2079
 [<ffffffff8246098e>] sk_flush_backlog include/net/sock.h:940 [inline]
 [<ffffffff8246098e>] tcp_sendmsg+0x245e/0x2fd0 net/ipv4/tcp.c:1225
 [<ffffffff82510da3>] inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:770
 [<ffffffff8222361b>] sock_sendmsg_nosec net/socket.c:648 [inline]
 [<ffffffff8222361b>] sock_sendmsg+0xbb/0x110 net/socket.c:658
 [<ffffffff82227680>] SYSC_sendto net/socket.c:1683 [inline]
 [<ffffffff82227680>] SyS_sendto+0x220/0x370 net/socket.c:1651
 [<ffffffff81005fd1>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81005fd1>] do_fast_syscall_32+0x2f1/0x860 arch/x86/entry/common.c:387
 [<ffffffff8278d6e0>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..