EXT4-fs (sda1): re-mounted. Opts: ,errors=continue
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BUG: KASAN: use-after-free in memset include/linux/string.h:329 [inline]
BUG: KASAN: use-after-free in __ext4_expand_extra_isize.isra.13+0x108/0x1b0 fs/ext4/inode.c:5780
Write of size 56598 at addr ffff88019a1295a0 by task syz-executor3/11097

CPU: 1 PID: 11097 Comm: syz-executor3 Not tainted 4.14.78+ #27
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xb9/0x11b lib/dump_stack.c:53
 print_address_description+0x60/0x22b mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report.cold.6+0x11b/0x2dd mm/kasan/report.c:409
 memset+0x1f/0x40 mm/kasan/kasan.c:285
 memset include/linux/string.h:329 [inline]
 __ext4_expand_extra_isize.isra.13+0x108/0x1b0 fs/ext4/inode.c:5780
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5832 [inline]
 ext4_mark_inode_dirty+0x46c/0x7e0 fs/ext4/inode.c:5908
 ext4_dirty_inode+0x71/0xa0 fs/ext4/inode.c:5942
 __mark_inode_dirty+0x108/0x1060 fs/fs-writeback.c:2097
 mark_inode_dirty include/linux/fs.h:2028 [inline]
 generic_write_end+0x187/0x250 fs/buffer.c:2217
 ext4_da_write_end+0x3d3/0xc10 fs/ext4/inode.c:3194
 generic_perform_write+0x294/0x430 mm/filemap.c:3048
 __generic_file_write_iter+0x345/0x540 mm/filemap.c:3162
 ext4_file_write_iter+0x4f6/0xe20 fs/ext4/file.c:264
 call_write_iter include/linux/fs.h:1782 [inline]
 new_sync_write fs/read_write.c:471 [inline]
 __vfs_write+0x417/0x5c0 fs/read_write.c:484
 vfs_write+0x17f/0x4d0 fs/read_write.c:546
 SYSC_write fs/read_write.c:593 [inline]
 SyS_write+0xc2/0x1a0 fs/read_write.c:585
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x457569
RSP: 002b:00007f1d3227ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 00000000fffffe38 RSI: 0000000020000080 RDI: 0000000000000005
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1d3227f6d4
R13: 00000000004c57f5 R14: 00000000004d93d0 R15: 00000000ffffffff

The buggy address belongs to the page:
page:ffffea0006684a40 count:2 mapcount:0 mapping:ffff8801d9aa8950 index:0x431
flags: 0x4000000000001074(referenced|dirty|lru|active|private)
raw: 4000000000001074 ffff8801d9aa8950 0000000000000431 00000002ffffffff
raw: ffffea0006b54660 ffffea000669fc20 ffff8801d51fe690 ffff8801da81aa80
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8801da81aa80

Memory state around the buggy address:
 ffff88019a130f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88019a130f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88019a131000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88019a131080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88019a131100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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