------------[ cut here ]------------
WARNING: CPU: 1 PID: 10467 at net/core/skbuff.c:4330 skb_try_coalesce+0xfc3/0x1600 net/core/skbuff.c:4330
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 10467 Comm: syz-executor2 Not tainted 4.9.87-gfc8bd0f #58
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d47e7058 ffffffff81d95bd9 ffffffff83a480c0 ffff8801d47e7130
 ffffffff83ee1200 ffffffff82f0dcd3 0000000000000009 ffff8801d47e7120
 ffffffff8142f7e1 0000000041b58ab3 ffffffff8418b890 ffffffff8142f625
Call Trace:
 [<ffffffff81d95bd9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d95bd9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8142f7e1>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff81131334>] __warn+0x1c4/0x1e0 kernel/panic.c:542
 [<ffffffff8113159c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff82f0dcd3>] skb_try_coalesce+0xfc3/0x1600 net/core/skbuff.c:4330
 [<ffffffff832407e3>] tcp_try_coalesce+0x153/0x4a0 net/ipv4/tcp_input.c:4347
 [<ffffffff8324be5d>] tcp_queue_rcv+0x12d/0x790 net/ipv4/tcp_input.c:4582
 [<ffffffff8325c1f4>] tcp_data_queue+0x8b4/0x4050 net/ipv4/tcp_input.c:4691
 [<ffffffff83260078>] tcp_rcv_established+0x6e8/0x2070 net/ipv4/tcp_input.c:5560
 [<ffffffff834cc4ed>] tcp_v6_do_rcv+0x40d/0x1380 net/ipv6/tcp_ipv6.c:1283
 [<ffffffff82ee769b>] sk_backlog_rcv include/net/sock.h:871 [inline]
 [<ffffffff82ee769b>] __release_sock+0x12b/0x390 net/core/sock.c:2059
 [<ffffffff82ee7959>] release_sock+0x59/0x1c0 net/core/sock.c:2520
 [<ffffffff83235e6f>] tcp_sendpage+0xb8f/0x1950 net/ipv4/tcp.c:1034
 [<ffffffff832f4287>] inet_sendpage+0x2d7/0x500 net/ipv4/af_inet.c:787
 [<ffffffff82ed936d>] kernel_sendpage+0x8d/0xe0 net/socket.c:3315
 [<ffffffff82ed944c>] sock_sendpage+0x8c/0xc0 net/socket.c:789
 [<ffffffff8160e7a4>] pipe_to_sendpage+0x264/0x320 fs/splice.c:470
 [<ffffffff81611b83>] splice_from_pipe_feed fs/splice.c:521 [inline]
 [<ffffffff81611b83>] __splice_from_pipe+0x323/0x730 fs/splice.c:645
 [<ffffffff816140d9>] splice_from_pipe+0xf9/0x160 fs/splice.c:680
 [<ffffffff81614180>] generic_splice_sendpage+0x40/0x50 fs/splice.c:851
 [<ffffffff8160e4e5>] do_splice_from fs/splice.c:870 [inline]
 [<ffffffff8160e4e5>] direct_splice_actor+0x125/0x180 fs/splice.c:1037
 [<ffffffff8160faac>] splice_direct_to_actor+0x2cc/0x800 fs/splice.c:992
 [<ffffffff81610187>] do_splice_direct+0x1a7/0x270 fs/splice.c:1080
 [<ffffffff815730cb>] do_sendfile+0x54b/0xd30 fs/read_write.c:1393
 [<ffffffff81575021>] SYSC_sendfile64 fs/read_write.c:1448 [inline]
 [<ffffffff81575021>] SyS_sendfile64+0xd1/0x160 fs/read_write.c:1440
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b6b53>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..