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
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail+0x87b/0xab0 lib/fault-inject.c:149
==================================================================
BUG: KMSAN: uninit-value in core_kernel_text kernel/extable.c:77 [inline]
BUG: KMSAN: uninit-value in kernel_text_address+0x248/0x3a0 kernel/extable.c:127
CPU: 1 PID: 3583 Comm: syzkaller413514 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+0x14a/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
 core_kernel_text kernel/extable.c:77 [inline]
 kernel_text_address+0x248/0x3a0 kernel/extable.c:127
 __kernel_text_address+0x34/0xe0 kernel/extable.c:107
 show_trace_log_lvl+0x954/0x1030 arch/x86/kernel/dumpstack.c:175
 show_stack+0xfc/0x150 arch/x86/kernel/dumpstack.c:236
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail+0x87b/0xab0 lib/fault-inject.c:149
 should_failslab+0x279/0x2a0 mm/failslab.c:32
 slab_pre_alloc_hook mm/slab.h:422 [inline]
 slab_alloc_node mm/slub.c:2663 [inline]
 slab_alloc mm/slub.c:2745 [inline]
 __kmalloc_track_caller+0x208/0xcb0 mm/slub.c:4339
 memdup_user+0x7c/0x200 mm/util.c:160
 strndup_user+0x134/0x1f0 mm/util.c:217
 copy_mount_string fs/namespace.c:2746 [inline]
 SYSC_mount+0xc4/0x3d0 fs/namespace.c:3043
 SyS_mount+0x77/0xa0 fs/namespace.c:3035
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x445919
RSP: 002b:00007fae57ea8d78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445919
RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000020000040
RBP: 00000000006dac20 R08: 00000000200004c0 R09: 0000000000000031
R10: 0000000001000000 R11: 0000000000000246 R12: 00007fae57ea8d80
R13: 0030656c69662f2e R14: 0000000000000003 R15: 2f30656c69662f2e

Local variable description: ----buf@kstrtouint_from_user
Variable was created at:
 kstrtouint_from_user+0xa9/0x410 lib/kstrtox.c:405
 proc_fail_nth_write+0xe0/0x330 fs/proc/base.c:1369
==================================================================