------------[ cut here ]------------
WARNING: CPU: 1 PID: 12553 at net/core/skbuff.c:4375 skb_try_coalesce+0xeb1/0x1270 net/core/skbuff.c:4375
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 12553 Comm: syz-executor.4 Not tainted 4.9.141+ #1
 ffff8801cff97060 ffffffff81b42e79 ffffffff82a38ce0 00000000ffffffff
 ffffffff82c6f700 0000000000000001 0000000000000009 ffff8801cff97120
 ffffffff813f7125 0000000041b58ab3 ffffffff82e2b62b ffffffff813f6f66
Call Trace:
 [<ffffffff81b42e79>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b42e79>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff813f7125>] panic+0x1bf/0x39f kernel/panic.c:179
 [<ffffffff813f7362>] __warn.cold.8+0x2f/0x2f kernel/panic.c:542
 [<ffffffff810dc02c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff822cd731>] skb_try_coalesce+0xeb1/0x1270 net/core/skbuff.c:4375
 [<ffffffff824f0db9>] tcp_try_coalesce+0x159/0x490 net/ipv4/tcp_input.c:4362
 [<ffffffff824f1217>] tcp_queue_rcv+0x127/0x590 net/ipv4/tcp_input.c:4614
 [<ffffffff8250743d>] tcp_data_queue+0x96d/0x38a0 net/ipv4/tcp_input.c:4723
 [<ffffffff8250a8ad>] tcp_rcv_established+0x53d/0x1ff0 net/ipv4/tcp_input.c:5604
 [<ffffffff82741b31>] tcp_v6_do_rcv+0xcd1/0x10e0 net/ipv6/tcp_ipv6.c:1283
 [<ffffffff822ae7fa>] sk_backlog_rcv include/net/sock.h:871 [inline]
 [<ffffffff822ae7fa>] __release_sock+0x13a/0x390 net/core/sock.c:2059
 [<ffffffff822aeaa9>] release_sock+0x59/0x1c0 net/core/sock.c:2520
 [<ffffffff824e121f>] tcp_sendpage+0x6bf/0x1910 net/ipv4/tcp.c:1034
 [<ffffffff825968b1>] inet_sendpage+0x221/0x510 net/ipv4/af_inet.c:787
 [<ffffffff822a0313>] kernel_sendpage+0x93/0xf0 net/socket.c:3334
 [<ffffffff822a03fc>] sock_sendpage+0x8c/0xc0 net/socket.c:802
 [<ffffffff815a98c6>] pipe_to_sendpage+0x266/0x330 fs/splice.c:470
 [<ffffffff815ad926>] splice_from_pipe_feed fs/splice.c:521 [inline]
 [<ffffffff815ad926>] __splice_from_pipe+0x316/0x710 fs/splice.c:645
 [<ffffffff815af439>] splice_from_pipe+0xf9/0x170 fs/splice.c:680
 [<ffffffff815af4ec>] generic_splice_sendpage+0x3c/0x50 fs/splice.c:851
 [<ffffffff815a9ab8>] do_splice_from fs/splice.c:870 [inline]
 [<ffffffff815a9ab8>] direct_splice_actor+0x128/0x190 fs/splice.c:1037
 [<ffffffff815ab6c1>] splice_direct_to_actor+0x2c1/0x7e0 fs/splice.c:992
 [<ffffffff815abd83>] do_splice_direct+0x1a3/0x270 fs/splice.c:1080
 [<ffffffff8150d780>] do_sendfile+0x4f0/0xc30 fs/read_write.c:1393
 [<ffffffff8150f864>] SYSC_sendfile64 fs/read_write.c:1454 [inline]
 [<ffffffff8150f864>] SyS_sendfile64+0x144/0x160 fs/read_write.c:1440
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82817893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..