------------[ cut here ]------------
WARNING: CPU: 1 PID: 22962 at net/core/skbuff.c:4247 skb_try_coalesce+0xeb9/0x1270 net/core/skbuff.c:4247()
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 22962 Comm: syz-executor.2 Not tainted 4.4.174+ #4
 0000000000000000 23c9a9c2c5332b1a ffff8801b3d07090 ffffffff81aad1a1
 0000000000000000 ffffffff82835ee0 ffffffff82a525e0 0000000000001097
 ffffffff821fb519 ffff8801b3d07170 ffffffff813a48c2 0000000041b58ab3
Call Trace:
 [<ffffffff81aad1a1>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81aad1a1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff813a48c2>] panic+0x1b9/0x37b kernel/panic.c:112
audit: type=1400 audit(1572210572.087:337): avc:  denied  { read } for  pid=22955 comm="syz-executor.3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
 [<ffffffff813a4ab9>] warn_slowpath_common kernel/panic.c:455 [inline]
 [<ffffffff813a4ab9>] warn_slowpath_common.cold+0x20/0x20 kernel/panic.c:435
 [<ffffffff810d3aaa>] warn_slowpath_null+0x2a/0x30 kernel/panic.c:492
 [<ffffffff821fb519>] skb_try_coalesce+0xeb9/0x1270 net/core/skbuff.c:4247
 [<ffffffff8240fc2c>] tcp_try_coalesce+0x17c/0x510 net/ipv4/tcp_input.c:4288
 [<ffffffff824100e7>] tcp_queue_rcv+0x127/0x6f0 net/ipv4/tcp_input.c:4539
 [<ffffffff824148bb>] tcp_data_queue+0x64b/0x3a90 net/ipv4/tcp_input.c:4650
 [<ffffffff82422a99>] tcp_rcv_established+0x599/0x2070 net/ipv4/tcp_input.c:5538
 [<ffffffff8264b3f4>] tcp_v6_do_rcv+0xdb4/0x11d0 net/ipv6/tcp_ipv6.c:1267
 [<ffffffff821e5e40>] sk_backlog_rcv include/net/sock.h:875 [inline]
 [<ffffffff821e5e40>] __release_sock net/core/sock.c:2024 [inline]
 [<ffffffff821e5e40>] release_sock+0x170/0x500 net/core/sock.c:2477
 [<ffffffff823f9bb1>] tcp_sendpage net/ipv4/tcp.c:1034 [inline]
 [<ffffffff823f9bb1>] tcp_sendpage+0x641/0x17c0 net/ipv4/tcp.c:1022
 [<ffffffff824aa083>] inet_sendpage+0x223/0x520 net/ipv4/af_inet.c:772
 [<ffffffff821d81b5>] kernel_sendpage+0x95/0xf0 net/socket.c:3320
 [<ffffffff821d829b>] sock_sendpage+0x8b/0xc0 net/socket.c:793
 [<ffffffff81530f1d>] pipe_to_sendpage+0x28d/0x3d0 fs/splice.c:724
 [<ffffffff81533b6e>] splice_from_pipe_feed fs/splice.c:776 [inline]
 [<ffffffff81533b6e>] __splice_from_pipe+0x37e/0x7a0 fs/splice.c:901
 [<ffffffff81536be8>] splice_from_pipe+0x108/0x170 fs/splice.c:936
 [<ffffffff81536c8c>] generic_splice_sendpage+0x3c/0x50 fs/splice.c:1109
 [<ffffffff81530c16>] do_splice_from fs/splice.c:1128 [inline]
 [<ffffffff81530c16>] direct_splice_actor+0x126/0x1a0 fs/splice.c:1294
 [<ffffffff8153252e>] splice_direct_to_actor+0x2ce/0x850 fs/splice.c:1247
 [<ffffffff81532c55>] do_splice_direct+0x1a5/0x260 fs/splice.c:1337
 [<ffffffff8149a2fd>] do_sendfile+0x4ed/0xba0 fs/read_write.c:1229
 [<ffffffff8149c317>] SYSC_sendfile64 fs/read_write.c:1290 [inline]
 [<ffffffff8149c317>] SyS_sendfile64+0x137/0x150 fs/read_write.c:1276
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Kernel Offset: disabled
Rebooting in 86400 seconds..