==================================================================
BUG: KMSAN: uninit-value in do_error_trap+0x39b/0x600 arch/x86/kernel/traps.c:297
CPU: 1 PID: 3568 Comm: syzkaller958196 Not tainted 4.16.0+ #82
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 do_error_trap+0x39b/0x600 arch/x86/kernel/traps.c:297
 do_invalid_op+0x46/0x50 arch/x86/kernel/traps.c:316
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:986
RIP: 0010:kmsan_copy_to_user+0x141/0x160 mm/kmsan/kmsan.c:1213
RSP: 0018:ffff8801aebff968 EFLAGS: 00010202
RAX: ffff8801df02d880 RBX: ffff8801aebffb00 RCX: 0000000000000010
RDX: 00007ffffffff000 RSI: ffff8801aebffb00 RDI: 65732f636f72702f
RBP: ffff8801aebff9b0 R08: 0000000001080020 R09: ffff8801ae3efa24
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000010
R13: 65732f636f72702f R14: 0000000000000000 R15: 00000000b3800071
 copy_to_user include/linux/uaccess.h:184 [inline]
 move_addr_to_user+0x32e/0x530 net/socket.c:227
 ___sys_recvmsg+0x4e2/0x810 net/socket.c:2211
 __sys_recvmmsg+0x54e/0xdb0 net/socket.c:2313
 SYSC_recvmmsg+0x29b/0x3e0 net/socket.c:2394
 SyS_recvmmsg+0x76/0xa0 net/socket.c:2378
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x43ff69
RSP: 002b:00007ffc8d781ec8 EFLAGS: 00000286 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043ff69
RDX: 0000000000000050 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000200001c0 R09: 0000000000000010
R10: 0000000000000002 R11: 0000000000000286 R12: 0000000000401890
R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000

Local variable description: ----wait.i@lock_sock_nested
Variable was created at:
 lock_sock_nested+0x3f/0x2a0 net/core/sock.c:2767
 lock_sock include/net/sock.h:1464 [inline]
 raw_sendmsg+0x27bc/0x3ed0 net/ipv4/raw.c:677
==================================================================
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3568 Comm: syzkaller958196 Tainted: G    B            4.16.0+ #82
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 panic+0x39d/0x940 kernel/panic.c:183
 kmsan_report+0x238/0x240 mm/kmsan/kmsan.c:1083
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 do_error_trap+0x39b/0x600 arch/x86/kernel/traps.c:297
 do_invalid_op+0x46/0x50 arch/x86/kernel/traps.c:316
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:986
RIP: 0010:kmsan_copy_to_user+0x141/0x160 mm/kmsan/kmsan.c:1213
RSP: 0018:ffff8801aebff968 EFLAGS: 00010202
RAX: ffff8801df02d880 RBX: ffff8801aebffb00 RCX: 0000000000000010
RDX: 00007ffffffff000 RSI: ffff8801aebffb00 RDI: 65732f636f72702f
RBP: ffff8801aebff9b0 R08: 0000000001080020 R09: ffff8801ae3efa24
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000010
R13: 65732f636f72702f R14: 0000000000000000 R15: 00000000b3800071
 copy_to_user include/linux/uaccess.h:184 [inline]
 move_addr_to_user+0x32e/0x530 net/socket.c:227
 ___sys_recvmsg+0x4e2/0x810 net/socket.c:2211
 __sys_recvmmsg+0x54e/0xdb0 net/socket.c:2313
 SYSC_recvmmsg+0x29b/0x3e0 net/socket.c:2394
 SyS_recvmmsg+0x76/0xa0 net/socket.c:2378
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x43ff69
RSP: 002b:00007ffc8d781ec8 EFLAGS: 00000286 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043ff69
RDX: 0000000000000050 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000200001c0 R09: 0000000000000010
R10: 0000000000000002 R11: 0000000000000286 R12: 0000000000401890
R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..