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: 0 PID: 7731 Comm: syz-executor7 Not tainted 4.16.0+ #83
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]
 kmem_cache_alloc+0x136/0xb90 mm/slub.c:2750
 anon_vma_chain_alloc mm/rmap.c:128 [inline]
 __anon_vma_prepare+0xc9/0xb10 mm/rmap.c:182
 anon_vma_prepare include/linux/rmap.h:153 [inline]
 do_huge_pmd_anonymous_page+0x3e8/0x2520 mm/huge_memory.c:679
 create_huge_pmd mm/memory.c:3870 [inline]
 __handle_mm_fault mm/memory.c:4074 [inline]
 handle_mm_fault+0x30ba/0x7ba0 mm/memory.c:4140
 __do_page_fault+0xec4/0x1a10 arch/x86/mm/fault.c:1423
 do_page_fault+0xd3/0x260 arch/x86/mm/fault.c:1500
 page_fault+0x25/0x50 arch/x86/entry/entry_64.S:1151
RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:180
RSP: 0018:ffff880164a7fce0 EFLAGS: 00010202
RAX: ffffffff82b97deb RBX: 0000000020000000 RCX: 0000000000000078
RDX: 0000000000000078 RSI: ffff880164a7fd58 RDI: 0000000020000000
RBP: ffff880164a7fd48 R08: 0000000001080020 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff880164a7fce8 R14: 0000000000000000 R15: ffff880167c4c418
 copy_to_user include/linux/uaccess.h:183 [inline]
 copy_msqid_to_user ipc/msg.c:288 [inline]
 SYSC_msgctl+0x2c2/0x5e0 ipc/msg.c:565
 SyS_msgctl+0x54/0x80 ipc/msg.c:536
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455279
RSP: 002b:00007f06f4475c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000047
RAX: ffffffffffffffda RBX: 00007f06f44766d4 RCX: 0000000000455279
RDX: 0000000020000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000013
R13: 0000000000000408 R14: 00000000006f9160 R15: 0000000000000000

Local variable description: ----success.i.i.i@should_fail
Variable was created at:
 should_fail+0x57/0xab0 lib/fault-inject.c:109
 should_failslab+0x279/0x2a0 mm/failslab.c:32
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