kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 4700 Comm: syz-executor4 Not tainted 4.4.167+ #4
task: ffff8801d9358000 task.stack: ffff8801d9080000
RIP: 0010:[<ffffffff823f7159>]  [<ffffffff823f7159>] tcp_sendmsg+0x459/0x2b30 net/ipv4/tcp.c:1165
RSP: 0018:ffff8801d9087928  EFLAGS: 00010206
RAX: 0000000000000011 RBX: 000000007fb29588 RCX: 1ffff1001701430e
RDX: 0000000000000001 RSI: ffffffff823f7138 RDI: 0000000000000089
RBP: ffff8801d9087af0 R08: ffff8801d93588c8 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff831a4978 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8800b80a1600
FS:  0000000000000000(0000) GS:ffff8801db600000(0063) knlGS:00000000f77cfb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007fff6bdf2fe8 CR3: 00000001d5b5a000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d9c08000 ffff8800b80a1628 ffff8801d9358800 fffffbfff0634d24
 ffff8801d9359200 0000000000000001 ffff8800b43fad48 ffff8800b80a1858
 ffff8800b43facfc ffff8800b80a1e1b ffff8800b43fad44 0000000100000246
Call Trace:
 [<ffffffff824a4e33>] inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:755
 [<ffffffff821d1f8b>] sock_sendmsg_nosec net/socket.c:638 [inline]
 [<ffffffff821d1f8b>] sock_sendmsg+0xbb/0x110 net/socket.c:648
 [<ffffffff821d2203>] sock_write_iter+0x223/0x3b0 net/socket.c:847
 [<ffffffff814918d4>] new_sync_write fs/read_write.c:478 [inline]
 [<ffffffff814918d4>] __vfs_write+0x304/0x3e0 fs/read_write.c:491
 [<ffffffff8149339e>] vfs_write+0x17e/0x4e0 fs/read_write.c:538
 [<ffffffff814959d9>] SYSC_write fs/read_write.c:585 [inline]
 [<ffffffff814959d9>] SyS_write+0xd9/0x1c0 fs/read_write.c:577
 [<ffffffff810060fe>] do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
 [<ffffffff810060fe>] do_fast_syscall_32+0x31e/0xa80 arch/x86/entry/common.c:397
 [<ffffffff82717690>] sysenter_flags_fixed+0xd/0x1a
Code: 84 5d 09 00 00 e8 08 01 f1 fe 8b 85 18 ff ff ff 49 8d bc 24 89 00 00 00 48 89 fa 83 e2 07 89 85 f0 fe ff ff 48 89 f8 48 c1 e8 03 <42> 0f b6 04 30 38 d0 7f 08 84 c0 0f 85 2f 20 00 00 41 f6 84 24 
RIP  [<ffffffff823f7159>] tcp_sendmsg+0x459/0x2b30 net/ipv4/tcp.c:1165
 RSP <ffff8801d9087928>
---[ end trace f54909e03b14f15d ]---