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BUG: KMSAN: uninit-value in prefetch_freepointer mm/slub.c:276 [inline]
BUG: KMSAN: uninit-value in slab_alloc_node mm/slub.c:2730 [inline]
BUG: KMSAN: uninit-value in slab_alloc mm/slub.c:2745 [inline]
BUG: KMSAN: uninit-value in __kmalloc_track_caller+0x770/0xcb0 mm/slub.c:4339
CPU: 1 PID: 9023 Comm: syz-executor7 Not tainted 4.16.0+ #87
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:683
 prefetch_freepointer mm/slub.c:276 [inline]
 slab_alloc_node mm/slub.c:2730 [inline]
 slab_alloc mm/slub.c:2745 [inline]
 __kmalloc_track_caller+0x770/0xcb0 mm/slub.c:4339
 kmemdup+0x95/0x140 mm/util.c:118
 shmem_symlink+0x3bc/0xbb0 mm/shmem.c:3260
 vfs_symlink+0x635/0x850 fs/namei.c:4105
 SYSC_symlinkat+0x374/0x840 fs/namei.c:4132
 SyS_symlinkat+0x55/0x80 fs/namei.c:4112
 SYSC_symlink+0x74/0x90 fs/namei.c:4145
 SyS_symlink+0x46/0x70 fs/namei.c:4143
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x4556a7
RSP: 002b:0000000000a3eab8 EFLAGS: 00000217 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 0000000000000052 RCX: 00000000004556a7
RDX: 0000000000000000 RSI: 00000000004badea RDI: 0000000000a3f7b0
RBP: 0000000000000013 R08: 0000000000000000 R09: 0000000001fd0940
R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000000013
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000001380

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
 kmsan_slab_alloc+0x11/0x20 mm/kmsan/kmsan.c:321
 slab_post_alloc_hook mm/slab.h:445 [inline]
 slab_alloc_node mm/slub.c:2737 [inline]
 slab_alloc mm/slub.c:2745 [inline]
 __kmalloc_track_caller+0x957/0xcb0 mm/slub.c:4339
 kvasprintf+0x165/0x340 lib/kasprintf.c:25
 kasprintf+0x1b9/0x1f0 lib/kasprintf.c:59
 memcg_create_kmem_cache+0x31d/0x730 mm/slab_common.c:644
 memcg_kmem_cache_create_func+0xa8/0x2c0 mm/memcontrol.c:2181
 process_one_work+0x12c6/0x1f60 kernel/workqueue.c:2113
 worker_thread+0x113c/0x24f0 kernel/workqueue.c:2247
 kthread+0x539/0x720 kernel/kthread.c:239
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:406
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