bisecting fixing commit since 3e968c9f1401088abc9a19ae6ff571644d37a355
building syzkaller on 676bd07e7e80f8a270af7f0276443c68f4a99e25
testing commit 3e968c9f1401088abc9a19ae6ff571644d37a355 with gcc (GCC) 8.1.0
kernel signature: 58a5cdacd395644a1c874e64dbdf482e905cd833de95714c5cc1192c0abf8c4d
run #0: crashed: KASAN: use-after-free Read in ntfs_read_locked_inode
run #1: crashed: KASAN: use-after-free Read in __ntfs_write_inode
run #2: crashed: KASAN: use-after-free Read in ntfs_read_locked_inode
run #3: crashed: KASAN: use-after-free Read in ntfs_read_locked_inode
run #4: crashed: KASAN: use-after-free Read in ntfs_read_locked_inode
run #5: crashed: KASAN: use-after-free Read in ntfs_read_locked_inode
run #6: crashed: KASAN: use-after-free Read in ntfs_read_locked_inode
run #7: crashed: KASAN: use-after-free Read in ntfs_read_locked_inode
run #8: crashed: KASAN: use-after-free Read in ntfs_read_locked_inode
run #9: crashed: KASAN: use-after-free Read in ntfs_read_locked_inode
testing current HEAD 0a679e13ea30f85a1aef0669ee0c5a9fd7860b34
testing commit 0a679e13ea30f85a1aef0669ee0c5a9fd7860b34 with gcc (GCC) 8.1.0
kernel signature: e33f89c9ab9d25d3f7add443f75b5b956bafe196c3721e533707d8a8884be88e
run #0: crashed: KASAN: use-after-free Read in ntfs_read_locked_inode
run #1: crashed: KASAN: use-after-free Read in ntfs_read_locked_inode
run #2: crashed: KASAN: use-after-free Read in ntfs_read_locked_inode
run #3: crashed: KASAN: use-after-free Read in ntfs_read_locked_inode
run #4: crashed: KASAN: use-after-free Read in __ntfs_write_inode
run #5: crashed: KASAN: use-after-free Read in __ntfs_write_inode
run #6: crashed: KASAN: use-after-free Read in ntfs_read_locked_inode
run #7: crashed: KASAN: use-after-free Read in ntfs_read_locked_inode
run #8: crashed: KASAN: use-after-free Read in ntfs_read_locked_inode
run #9: crashed: KASAN: use-after-free Read in ntfs_read_locked_inode
revisions tested: 2, total time: 20m39.51116555s (build: 13m36.581791422s, test: 6m4.034806077s)
the crash still happens on HEAD
commit msg: Merge branch 'for-5.6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
crash: KASAN: use-after-free Read in ntfs_read_locked_inode
ntfs: (device loop3): ntfs_read_locked_inode(): Failed with error code -5.  Marking corrupt inode 0xa as bad.  Run chkdsk.
ntfs: (device loop3): load_and_init_upcase(): Failed to load $UpCase from the volume. Using default.
ntfs: volume version 3.1.
ntfs: (device loop3): map_mft_record_page(): Mft record 0x2 is corrupt.  Run chkdsk.
==================================================================
BUG: KASAN: use-after-free in ntfs_read_locked_inode+0x4429/0x52a0 fs/ntfs/inode.c:644
Read of size 8 at addr ffff8881bae0a2e8 by task syz-executor3/4449

CPU: 0 PID: 4449 Comm: syz-executor3 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x12f/0x187 lib/dump_stack.c:118
 print_address_description.constprop.8+0x3b/0x60 mm/kasan/report.c:374
 __kasan_report.cold.11+0x1b/0x32 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:641
 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/generic_report.c:145
 ntfs_read_locked_inode+0x4429/0x52a0 fs/ntfs/inode.c:644
 ntfs_iget+0xe6/0x120 fs/ntfs/inode.c:176
 load_and_init_quota fs/ntfs/super.c:1392 [inline]
 load_system_files+0x55fa/0x6530 fs/ntfs/super.c:2103
 ntfs_fill_super+0x12a6/0x2d40 fs/ntfs/super.c:2894
 mount_bdev+0x27b/0x340 fs/super.c:1417
 ntfs_mount+0x10/0x20 fs/ntfs/super.c:3051
 legacy_get_tree+0x103/0x1f0 fs/fs_context.c:622
 vfs_get_tree+0x8b/0x2d0 fs/super.c:1547
 do_new_mount fs/namespace.c:2822 [inline]
 do_mount+0x1285/0x1b70 fs/namespace.c:3107
 __do_sys_mount fs/namespace.c:3316 [inline]
 __se_sys_mount fs/namespace.c:3293 [inline]
 __x64_sys_mount+0x169/0x1c0 fs/namespace.c:3293
 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457e5a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 dd 8f fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 ba 8f fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007fd00854dbb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000000 RCX: 0000000000457e5a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fd00854dc00
RBP: 000000000000005a R08: 0000000020077a00 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 000000000000066c R14: 00000000006fcac0 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0006eb8280 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 ffffea0006eb82c8 ffffea0006eb8248 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881bae0a180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881bae0a200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881bae0a280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                          ^
 ffff8881bae0a300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881bae0a380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================