divide error: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
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Modules linked in:
CPU: 0 PID: 9311 Comm: syz-executor7 Not tainted 4.9.42-g02f29ab #24
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801aa18e000 task.stack: ffff8801cab40000
RIP: 0010:[<ffffffff83260fe2>]  [<ffffffff83260fe2>] __tcp_select_window+0x432/0x510 net/ipv4/tcp_output.c:2499
RSP: 0018:ffff8801cab47988  EFLAGS: 00010212
RAX: 0000000000000480 RBX: 0000000000000480 RCX: ffffc900008b7000
RDX: 0000000000000000 RSI: 0000000000000480 RDI: ffff8801d61a28e5
RBP: ffff8801cab479b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 1ffff10039568eea R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801d61a2040
FS:  00007fe0cf051700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020936000 CR3: 00000001aa6d0000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 000000008123b60d ffff8801d61a2040 0000000000000000 ffff8801d61a2170
 0000000000000480 ffff8801d61a2040 ffff8801cab479e8 ffffffff8321a4ce
 ffff8801d61a2170 0000000000000000 dffffc0000000000 ffff8801d61a2170
Call Trace:
 [<ffffffff8321a4ce>] tcp_cleanup_rbuf+0x43e/0x4f0 net/ipv4/tcp.c:1468
 [<ffffffff8321fd92>] tcp_recvmsg+0xd92/0x2810 net/ipv4/tcp.c:1937
 [<ffffffff832e4986>] inet_recvmsg+0x306/0x4c0 net/ipv4/af_inet.c:784
 [<ffffffff82ec81a9>] sock_recvmsg_nosec net/socket.c:737 [inline]
 [<ffffffff82ec81a9>] sock_recvmsg+0xc9/0x110 net/socket.c:744
 [<ffffffff82ec9ab2>] SYSC_recvfrom+0x1f2/0x320 net/socket.c:1721
 [<ffffffff82ece030>] SyS_recvfrom+0x40/0x50 net/socket.c:1694
 [<ffffffff838a5a05>] entry_SYSCALL_64_fastpath+0x23/0xc6
Code: fe 89 d8 44 29 e8 44 39 e0 7d 18 44 39 e3 7c 13 e8 d4 90 10 fe 45 39 f5 0f 84 b5 00 00 00 44 89 e3 eb be e8 c1 90 10 fe 89 d8 99 <41> f7 fd 89 c3 41 0f af dd eb ab e8 ae 90 10 fe 44 89 f1 f7 d9 
RIP  [<ffffffff83260fe2>] __tcp_select_window+0x432/0x510 net/ipv4/tcp_output.c:2499
 RSP <ffff8801cab47988>
---[ end trace 7a3e10c31fe0bd0e ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
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Kernel Offset: disabled
Rebooting in 86400 seconds..