EXT4-fs (sda1): Unrecognized mount option "" or missing value
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BUG: KASAN: use-after-free in memset include/linux/string.h:332 [inline]
BUG: KASAN: use-after-free in __ext4_expand_extra_isize.isra.0+0x10b/0x1c0 fs/ext4/inode.c:5832
Write of size 32735 at addr ffff8881aac8b0a0 by task syz-executor.5/9071

CPU: 0 PID: 9071 Comm: syz-executor.5 Not tainted 4.14.150+ #0
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xca/0x134 lib/dump_stack.c:53
 print_address_description+0x60/0x226 mm/kasan/report.c:187
 __kasan_report.cold+0x1a/0x41 mm/kasan/report.c:316
 memset+0x20/0x40 mm/kasan/common.c:113
 memset include/linux/string.h:332 [inline]
 __ext4_expand_extra_isize.isra.0+0x10b/0x1c0 fs/ext4/inode.c:5832
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5884 [inline]
 ext4_mark_inode_dirty+0x471/0x7f0 fs/ext4/inode.c:5960
 ext4_dirty_inode+0x6c/0x90 fs/ext4/inode.c:5994
 __mark_inode_dirty+0x69c/0x1080 fs/fs-writeback.c:2141
 generic_update_time+0x1b0/0x270 fs/inode.c:1650
 update_time fs/inode.c:1666 [inline]
 file_update_time+0x269/0x390 fs/inode.c:1882
 ext4_page_mkwrite+0x1d9/0x1030 fs/ext4/inode.c:6145
 do_page_mkwrite+0xd9/0x2f0 mm/memory.c:2383
 do_shared_fault mm/memory.c:3698 [inline]
 do_fault mm/memory.c:3763 [inline]
 handle_pte_fault mm/memory.c:3989 [inline]
 __handle_mm_fault+0x1054/0x2700 mm/memory.c:4113
 handle_mm_fault+0x2f1/0x6da mm/memory.c:4150
 __do_page_fault+0x477/0xbb0 arch/x86/mm/fault.c:1420
 page_fault+0x42/0x50 arch/x86/entry/entry_64.S:1122
RIP: 80000000:0x7fbd682c3008
RSP: 30412bf5:00000000000003f9 EFLAGS: 0075bfa8

The buggy address belongs to the page:
page:ffffea0006ab22c0 count:2 mapcount:0 mapping:ffff8881d9ab8950 index:0x429
flags: 0x400000000000203a(referenced|dirty|lru|active|private)
raw: 400000000000203a ffff8881d9ab8950 0000000000000429 00000002ffffffff
raw: ffffea00070e9d60 ffffea0006ab3b20 ffff8881c45842a0 ffff8881da81aa80
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8881da81aa80

Memory state around the buggy address:
 ffff8881aac92f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881aac92f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881aac93000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8881aac93080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881aac93100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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