==================================================================
BUG: KMSAN: uninit-value in __x64_sys_futex+0x1b9/0x200 kernel/futex.c:3555
CPU: 0 PID: 19858 Comm: syz-executor5 Not tainted 4.17.0+ #9
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+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:1125
 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:620
 __x64_sys_futex+0x1b9/0x200 kernel/futex.c:3555
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x455a99
RSP: 002b:00007fbff42adc88 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fbff42ae6d4 RCX: 0000000000455a99
RDX: 000000000000ff6c RSI: 0000000000000001 RDI: 000000000072bec4
RBP: 000000000072bea0 R08: 0000000000000010 R09: 0000000000000000
R10: 00000000200000c0 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c0ef1 R14: 00000000004d0de8 R15: 0000000000000000

Local variable description: ----fragstolen@tcp_rcv_established
Variable was created at:
 tcp_rcv_established+0x8e/0x2bb0 net/ipv4/tcp_input.c:5304
 tcp_v4_do_rcv+0x6d2/0xd90 net/ipv4/tcp_ipv4.c:1477
==================================================================
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 19858 Comm: syz-executor5 Tainted: G    B             4.17.0+ #9
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+0x185/0x1d0 lib/dump_stack.c:113
 panic+0x3d0/0x990 kernel/panic.c:184
 kmsan_report+0x29e/0x2a0 mm/kmsan/kmsan.c:1144
 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:620
 __x64_sys_futex+0x1b9/0x200 kernel/futex.c:3555
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x455a99
RSP: 002b:00007fbff42adc88 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fbff42ae6d4 RCX: 0000000000455a99
RDX: 000000000000ff6c RSI: 0000000000000001 RDI: 000000000072bec4
RBP: 000000000072bea0 R08: 0000000000000010 R09: 0000000000000000
R10: 00000000200000c0 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c0ef1 R14: 00000000004d0de8 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..