------------[ cut here ]------------
WARNING: CPU: 1 PID: 3643 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: 3643 Comm: syz-executor.1 Not tainted 4.9.194+ #0
 ffff8801708c7030 ffffffff81b67001 0000000000000000 ffffffff82a3b3c0
 00000000ffffffff 0000000000000001 0000000000000009 ffff8801708c7110
 ffffffff813fef3a 0000000041b58ab3 ffffffff82e32f55 ffffffff813fed61
Call Trace:
 [<000000002f58eb15>] __dump_stack lib/dump_stack.c:15 [inline]
 [<000000002f58eb15>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<000000006159c8b7>] panic+0x1d9/0x3bd kernel/panic.c:180
 [<0000000078d23ec5>] __warn.cold+0x2f/0x2f kernel/panic.c:546
 [<00000000790c11c6>] warn_slowpath_null+0x2d/0x40 kernel/panic.c:589
 [<000000005296c6a7>] skb_try_coalesce+0xeb7/0x1260 net/core/skbuff.c:4398
 [<000000008ee31634>] tcp_try_coalesce+0x173/0x4e0 net/ipv4/tcp_input.c:4378
 [<000000001e04fdc6>] tcp_queue_rcv+0x129/0x5a0 net/ipv4/tcp_input.c:4630
 [<000000001610e707>] tcp_data_queue+0x600/0x3810 net/ipv4/tcp_input.c:4739
 [<0000000007fbb854>] tcp_rcv_established+0x55a/0x20b0 net/ipv4/tcp_input.c:5620
 [<00000000314627b3>] tcp_v6_do_rcv+0xcd9/0x10f0 net/ipv6/tcp_ipv6.c:1283
 [<000000008c9e94a2>] sk_backlog_rcv include/net/sock.h:881 [inline]
 [<000000008c9e94a2>] __release_sock+0x138/0x390 net/core/sock.c:2060
 [<00000000444e1d6c>] release_sock+0x59/0x1c0 net/core/sock.c:2524
 [<0000000073c208c4>] tcp_sendpage net/ipv4/tcp.c:1034 [inline]
 [<0000000073c208c4>] tcp_sendpage+0x6b4/0x18f0 net/ipv4/tcp.c:1019
 [<0000000086089472>] inet_sendpage+0x223/0x520 net/ipv4/af_inet.c:783
 [<000000004ede792c>] kernel_sendpage+0x95/0xf0 net/socket.c:3326
 [<0000000054c6bb03>] sock_sendpage+0x8b/0xc0 net/socket.c:803
 [<000000001bc58ad9>] pipe_to_sendpage+0x28d/0x3d0 fs/splice.c:470
 [<000000004406fed0>] splice_from_pipe_feed fs/splice.c:521 [inline]
 [<000000004406fed0>] __splice_from_pipe+0x351/0x790 fs/splice.c:645
 [<000000007b7cf541>] splice_from_pipe+0x108/0x170 fs/splice.c:680
 [<0000000039082150>] generic_splice_sendpage+0x3c/0x50 fs/splice.c:851
 [<00000000efe0f9ca>] do_splice_from fs/splice.c:870 [inline]
 [<00000000efe0f9ca>] direct_splice_actor+0x126/0x1a0 fs/splice.c:1037
 [<00000000f145568d>] splice_direct_to_actor+0x2c8/0x820 fs/splice.c:992
 [<00000000d2544f98>] do_splice_direct+0x1a5/0x260 fs/splice.c:1080
 [<00000000833709d8>] do_sendfile+0x503/0xc00 fs/read_write.c:1402
 [<00000000246c0607>] SYSC_sendfile64 fs/read_write.c:1463 [inline]
 [<00000000246c0607>] SyS_sendfile64+0x145/0x160 fs/read_write.c:1449
 [<00000000d2096d13>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
 [<000000001a283071>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..