==================================================================
BUG: KMSAN: uninit-value in do_error_trap+0x39b/0x600 arch/x86/kernel/traps.c:297
CPU: 1 PID: 6778 Comm: syz-executor6 Not tainted 4.17.0-rc3+ #90
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+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
 do_error_trap+0x39b/0x600 arch/x86/kernel/traps.c:297
 do_invalid_op+0x46/0x50 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:kmsan_copy_to_user+0x141/0x160 mm/kmsan/kmsan.c:1213
RSP: 0018:ffff8801c3d1fa20 EFLAGS: 00010206
RAX: ffff8801454b9d40 RBX: ffff8801c3d1fa78 RCX: 0000000000000028
RDX: 00007ffffffff000 RSI: ffff8801c3d1fa78 RDI: 0030656c696ff62c
RBP: ffff8801c3d1fa68 R08: 0000000001080020 R09: ffff8801c869fa78
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000028
R13: 0030656c696ff62c R14: 0000000000000000 R15: 0000000000000000
 copy_to_user include/linux/uaccess.h:184 [inline]
 inet_gifconf+0x345/0x500 net/ipv4/devinet.c:1211
 dev_ifconf+0x2b3/0x500 net/core/dev_ioctl.c:78
 sock_do_ioctl+0x39b/0x6b0 net/socket.c:971
 sock_ioctl+0x400/0xca0 net/socket.c:1081
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0xaf0/0x2440 fs/ioctl.c:686
 ksys_ioctl fs/ioctl.c:701 [inline]
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x280/0x320 fs/ioctl.c:706
 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x455979
RSP: 002b:00007f6890a90c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6890a916d4 RCX: 0000000000455979
RDX: 0000000020000000 RSI: 0000000000008912 RDI: 0000000000000015
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000018f R14: 00000000006f6608 R15: 0000000000000000

Local variable description: ----key.i.i.i@make_kgid
Variable was created at:
 make_kgid+0x57/0x450 kernel/user_namespace.c:461
 i_gid_write include/linux/fs.h:1476 [inline]
 inode_init_always+0x32e/0xb30 fs/inode.c:147
==================================================================