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BUG: KMSAN: uninit-value in is_valid_bugaddr+0x17f/0x1a0 arch/x86/kernel/traps.c:165
CPU: 0 PID: 5095 Comm: syz-executor6 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
 is_valid_bugaddr+0x17f/0x1a0 arch/x86/kernel/traps.c:165
 report_bug+0x6f/0x880 lib/bug.c:149
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 do_error_trap+0x1aa/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:ffff880167b0f790 EFLAGS: 00010202
RAX: ffff8801d4051d80 RBX: ffff880167b0f808 RCX: 0000000000000010
RDX: 00007ffffffff000 RSI: ffff880167b0f808 RDI: ffff444900000000
RBP: ffff880167b0f7d8 R08: 000000000000008b R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000010
R13: ffff444900000000 R14: 0000000000000000 R15: 0000000000000000
 copy_to_user include/linux/uaccess.h:184 [inline]
 put_cmsg+0x4b5/0x870 net/core/scm.c:240
 packet_recvmsg+0x1b13/0x1cc0 net/packet/af_packet.c:3396
 sock_recvmsg_nosec net/socket.c:803 [inline]
 sock_recvmsg+0x1d0/0x230 net/socket.c:810
 ___sys_recvmsg+0x3fb/0x810 net/socket.c:2205
 __sys_recvmmsg+0x54e/0xdb0 net/socket.c:2313
 SYSC_recvmmsg+0x212/0x3e0 net/socket.c:2389
 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: 0033:0x455259
RSP: 002b:00007f430f274c68 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f430f2756d4 RCX: 0000000000455259
RDX: 0400000000000304 RSI: 0000000020000000 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000495 R14: 00000000006f9e98 R15: 0000000000000000

Local variable description: ----flags.i.i.i.i@enter_lazy_tlb
Variable was created at:
 enter_lazy_tlb+0x30/0x120 arch/x86/mm/tlb.c:352
 context_switch kernel/sched/core.c:2852 [inline]
 __schedule+0x5e6/0x730 kernel/sched/core.c:3446
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