sd 0:0:1:0: [sg0] tag#1099 CDB[10]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 anon_vma_prepare include/linux/rmap.h:153 [inline]
 do_huge_pmd_anonymous_page+0x3e8/0x2520 mm/huge_memory.c:679
sd 0:0:1:0: [sg0] tag#1099 CDB[20]: 00 00 00 00
 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
==================================================================
BUG: KMSAN: uninit-value in show_trace_log_lvl+0xda4/0x1030 arch/x86/kernel/dumpstack.c:203
CPU: 0 PID: 6555 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+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
 show_trace_log_lvl+0xda4/0x1030 arch/x86/kernel/dumpstack.c:203
 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_generic_unrolled+0x86/0xc0 arch/x86/lib/copy_user_64.S:65
RSP: 0018:ffff88016113faa0 EFLAGS: 00010202
RAX: ffffffff82b97c02 RBX: 0000000020000000 RCX: 0000000000000007
RDX: 0000000000000000 RSI: 0000000020000000 RDI: ffff88016113fb98
RBP: ffff88016113fb20 R08: 0000000001080020 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88016113faa8
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000038
 copy_from_user include/linux/uaccess.h:171 [inline]
 vlan_ioctl_handler+0xce/0x17f0 net/8021q/vlan.c:513
 sock_ioctl+0x9c6/0xbf0 net/socket.c:1059
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0xaf0/0x2440 fs/ioctl.c:686
 SYSC_ioctl+0x1d2/0x260 fs/ioctl.c:701
 SyS_ioctl+0x54/0x80 fs/ioctl.c:692
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455259
RSP: 002b:00007f8f77e5ac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8f77e5b6d4 RCX: 0000000000455259
RDX: 0000000020000000 RSI: 0800000000008982 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000014
R13: 000000000000018e R14: 00000000006f55f0 R15: 0000000000000000

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:293 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:521
 update_stack_state+0x9e2/0xa40 arch/x86/kernel/unwind_frame.c:261
 unwind_next_frame+0x618/0xe50 arch/x86/kernel/unwind_frame.c:329
 show_trace_log_lvl+0xb49/0x1030 arch/x86/kernel/dumpstack.c:212
 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
 copy_user_generic_unrolled+0x86/0xc0 arch/x86/lib/copy_user_64.S:65
 copy_from_user include/linux/uaccess.h:171 [inline]
 vlan_ioctl_handler+0xce/0x17f0 net/8021q/vlan.c:513
 sock_ioctl+0x9c6/0xbf0 net/socket.c:1059
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0xaf0/0x2440 fs/ioctl.c:686
 SYSC_ioctl+0x1d2/0x260 fs/ioctl.c:701
 SyS_ioctl+0x54/0x80 fs/ioctl.c:692
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Local variable description: ----c.i.i.i.i@d_alloc_parallel
Variable was created at:
 d_alloc_parallel+0xcc/0x22e0 fs/dcache.c:2469
 lookup_slow+0x1a0/0x760 fs/namei.c:1617
==================================================================