------------[ cut here ]------------
WARNING: CPU: 1 PID: 8792 at net/core/skbuff.c:4398 skb_try_coalesce+0xeb7/0x1260 net/core/skbuff.c:4398
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 8792 Comm: syz-executor.1 Not tainted 4.9.202+ #0
 ffff8801cb787030 ffffffff81b55d2b 0000000000000000 ffffffff82a3b700
 00000000ffffffff 0000000000000001 0000000000000009 ffff8801cb787110
 ffffffff813fef21 0000000041b58ab3 ffffffff82e316f3 ffffffff813fed41
Call Trace:
 [<000000006f0a04f9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<000000006f0a04f9>] dump_stack+0xcb/0x130 lib/dump_stack.c:56
 [<000000000f1dc2e4>] panic+0x1e0/0x3c4 kernel/panic.c:181
 [<000000002fa00c94>] __warn.cold+0x2f/0x2f kernel/panic.c:547
 [<00000000497a96cd>] warn_slowpath_null+0x2d/0x40 kernel/panic.c:590
 [<000000007e2e1623>] skb_try_coalesce+0xeb7/0x1260 net/core/skbuff.c:4398
 [<00000000dff58313>] tcp_try_coalesce+0x173/0x4e0 net/ipv4/tcp_input.c:4378
 [<00000000a9447d80>] tcp_queue_rcv+0x129/0x5a0 net/ipv4/tcp_input.c:4630
 [<00000000adb8762c>] tcp_data_queue+0x600/0x3810 net/ipv4/tcp_input.c:4739
 [<00000000da6f6872>] tcp_rcv_established+0x55a/0x20b0 net/ipv4/tcp_input.c:5620
 [<000000003be2f42e>] tcp_v6_do_rcv+0xcd9/0x10f0 net/ipv6/tcp_ipv6.c:1283
 [<00000000747e0b87>] sk_backlog_rcv include/net/sock.h:881 [inline]
 [<00000000747e0b87>] __release_sock+0x138/0x390 net/core/sock.c:2065
 [<00000000434ecc5e>] release_sock+0x59/0x1c0 net/core/sock.c:2529
 [<0000000082801041>] tcp_sendpage net/ipv4/tcp.c:1034 [inline]
 [<0000000082801041>] tcp_sendpage+0x6b4/0x18f0 net/ipv4/tcp.c:1019
 [<000000007145498b>] inet_sendpage+0x223/0x520 net/ipv4/af_inet.c:783
 [<000000000e2bbf2e>] kernel_sendpage+0x95/0xf0 net/socket.c:3326
 [<000000001df139e2>] sock_sendpage+0x8b/0xc0 net/socket.c:803
 [<000000004cf6d59b>] pipe_to_sendpage+0x28d/0x3d0 fs/splice.c:470
 [<000000006bc50cca>] splice_from_pipe_feed fs/splice.c:521 [inline]
 [<000000006bc50cca>] __splice_from_pipe+0x351/0x790 fs/splice.c:645
 [<00000000899cc5bd>] splice_from_pipe+0x108/0x170 fs/splice.c:680
 [<000000000d5c4b19>] generic_splice_sendpage+0x3c/0x50 fs/splice.c:851
 [<00000000c5f7576d>] do_splice_from fs/splice.c:870 [inline]
 [<00000000c5f7576d>] direct_splice_actor+0x126/0x1a0 fs/splice.c:1037
 [<0000000087f6c713>] splice_direct_to_actor+0x2c8/0x820 fs/splice.c:992
 [<0000000013006be0>] do_splice_direct+0x1a5/0x260 fs/splice.c:1080
 [<000000001ff49557>] do_sendfile+0x503/0xc00 fs/read_write.c:1402
 [<000000002d72ceb3>] SYSC_sendfile64 fs/read_write.c:1463 [inline]
 [<000000002d72ceb3>] SyS_sendfile64+0x145/0x160 fs/read_write.c:1449
 [<00000000c6b43518>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
 [<00000000a66c066d>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..