syzbot

random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
WARNING: CPU: 1 PID: 4511 at net/ipv4/tcp_input.c:2191 tcp_mark_head_lost+0x8e5/0xa60 net/ipv4/tcp_input.c:2191
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 4511 Comm: syz-executor393 Not tainted 4.17.0-rc2+ #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 panic+0x22f/0x4de kernel/panic.c:184
 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:tcp_mark_head_lost+0x8e5/0xa60 net/ipv4/tcp_input.c:2191
RSP: 0018:ffff8801acf2f4d8 EFLAGS: 00010293
RAX: ffff8801acf6c580 RBX: 0000000000000004 RCX: ffffffff8649528c
RDX: 0000000000000000 RSI: ffffffff86495385 RDI: 0000000000000004
RBP: ffff8801acf2f560 R08: ffff8801acf6c580 R09: ffff8801acf2f910
R10: 00000000022afba7 R11: ffff88021fff8057 R12: 0000000000000003
R13: ffff8801aceab500 R14: dffffc0000000000 R15: 0000000000000001
 tcp_update_scoreboard net/ipv4/tcp_input.c:2201 [inline]
 tcp_fastretrans_alert+0x163c/0x2850 net/ipv4/tcp_input.c:2845
 tcp_ack+0x2c3e/0x5500 net/ipv4/tcp_input.c:3615
 tcp_rcv_state_process+0xc60/0x4f57 net/ipv4/tcp_input.c:5878
 tcp_v4_do_rcv+0x365/0x8c0 net/ipv4/tcp_ipv4.c:1499
 sk_backlog_rcv include/net/sock.h:909 [inline]
 __release_sock+0x12f/0x3a0 net/core/sock.c:2335
 release_sock+0xa4/0x2b0 net/core/sock.c:2850
 inet_shutdown+0x1f7/0x3d0 net/ipv4/af_inet.c:889
 __sys_shutdown+0x154/0x2b0 net/socket.c:1967
 __do_sys_shutdown net/socket.c:1975 [inline]
 __se_sys_shutdown net/socket.c:1973 [inline]
 __x64_sys_shutdown+0x54/0x80 net/socket.c:1973
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440039
RSP: 002b:00007fff5656b1b8 EFLAGS: 00000217 ORIG_RAX: 0000000000000030
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440039
RDX: 0000000000440039 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000010 R09: 0000000000000010
R10: 0000000000000009 R11: 0000000000000217 R12: 0000000000401960
R13: 00000000004019f0 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..