------------[ cut here ]------------
WARNING: CPU: 0 PID: 12603 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: 0 PID: 12603 Comm: syz-executor.4 Not tainted 4.9.205-syzkaller #0
 ffff8801a7a5f030 ffffffff81b55e6b 0000000000000000 ffffffff82a3b700
 00000000ffffffff 0000000000000000 0000000000000009 ffff8801a7a5f110
 ffffffff813ff051 0000000041b58ab3 ffffffff82e316eb ffffffff813fee71
Call Trace:
 [<000000002b3cee1d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<000000002b3cee1d>] dump_stack+0xcb/0x130 lib/dump_stack.c:56
 [<00000000c410e0f0>] panic+0x1e0/0x3c4 kernel/panic.c:181
EXT4-fs warning (device sda1): ext4_group_extend:1767: can't read last block, resize aborted
 [<000000007ec6e72e>] __warn.cold+0x2f/0x2f kernel/panic.c:547
 [<00000000144ef852>] warn_slowpath_null+0x2d/0x40 kernel/panic.c:590
 [<000000008a9a7941>] skb_try_coalesce+0xeb7/0x1260 net/core/skbuff.c:4398
 [<00000000a9fb8306>] tcp_try_coalesce+0x173/0x4e0 net/ipv4/tcp_input.c:4378
 [<000000001aa4d104>] tcp_queue_rcv+0x129/0x5a0 net/ipv4/tcp_input.c:4630
 [<00000000fb82de13>] tcp_data_queue+0x600/0x3810 net/ipv4/tcp_input.c:4739
EXT4-fs warning (device sda1): ext4_group_extend:1767: can't read last block, resize aborted
 [<000000004ffb1281>] tcp_rcv_established+0x55a/0x20b0 net/ipv4/tcp_input.c:5620
 [<000000008fc9cb28>] tcp_v6_do_rcv+0xcd9/0x10f0 net/ipv6/tcp_ipv6.c:1283
 [<0000000072aa6e57>] sk_backlog_rcv include/net/sock.h:881 [inline]
 [<0000000072aa6e57>] __release_sock+0x138/0x390 net/core/sock.c:2065
 [<000000009c187cac>] release_sock+0x59/0x1c0 net/core/sock.c:2529
 [<0000000076c95a16>] tcp_sendpage net/ipv4/tcp.c:1034 [inline]
 [<0000000076c95a16>] tcp_sendpage+0x6b4/0x18f0 net/ipv4/tcp.c:1019
 [<000000001e546714>] inet_sendpage+0x223/0x520 net/ipv4/af_inet.c:783
 [<00000000888ba760>] kernel_sendpage+0x95/0xf0 net/socket.c:3326
 [<000000006050b061>] sock_sendpage+0x8b/0xc0 net/socket.c:803
 [<000000003f2433c9>] pipe_to_sendpage+0x28d/0x3d0 fs/splice.c:470
 [<00000000dcc2e3ae>] splice_from_pipe_feed fs/splice.c:521 [inline]
 [<00000000dcc2e3ae>] __splice_from_pipe+0x351/0x790 fs/splice.c:645
 [<00000000bf5051e4>] splice_from_pipe+0x108/0x170 fs/splice.c:680
 [<000000004a8845c3>] generic_splice_sendpage+0x3c/0x50 fs/splice.c:851
 [<00000000fb693670>] do_splice_from fs/splice.c:870 [inline]
 [<00000000fb693670>] direct_splice_actor+0x126/0x1a0 fs/splice.c:1037
 [<00000000afaf1364>] splice_direct_to_actor+0x2c8/0x820 fs/splice.c:992
 [<000000008863e6ca>] do_splice_direct+0x1a5/0x260 fs/splice.c:1080
 [<00000000da9bdc21>] do_sendfile+0x503/0xc00 fs/read_write.c:1402
 [<00000000eed9e138>] SYSC_sendfile64 fs/read_write.c:1463 [inline]
 [<00000000eed9e138>] SyS_sendfile64+0x145/0x160 fs/read_write.c:1449
 [<000000002b3fc4ac>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
 [<0000000028094f4d>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..