bisecting fixing commit since 13d2ce42de8cb98ff952f8de6307f896203854c2
building syzkaller on 821e0b09046a2f972ace26fbdc02aef1116792d4
testing commit 13d2ce42de8cb98ff952f8de6307f896203854c2 with gcc (GCC) 8.1.0
kernel signature: 0d1eb4d40eb02e861a1d16a9c72be1b53462fa620ccd5872ebc53dff2b0c2932
all runs: crashed: KASAN: use-after-free Read in ntfs_iget
testing current HEAD 2263955bf7e71ca8419b64d7a60510aad29002f6
testing commit 2263955bf7e71ca8419b64d7a60510aad29002f6 with gcc (GCC) 8.1.0
kernel signature: 63159727c5aa8ab35b48089dc55200974f913f2f4486b78684feab2839704830
all runs: crashed: KASAN: use-after-free Read in ntfs_iget
revisions tested: 2, total time: 22m46.577688959s (build: 16m14.747786849s, test: 6m1.896519159s)
the crash still happens on HEAD
commit msg: Linux 4.19.170
crash: KASAN: use-after-free Read in ntfs_iget
ntfs: (device loop0): ntfs_read_locked_inode(): Failed with error code -2.  Marking corrupt inode 0x1 as bad.  Run chkdsk.
wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
==================================================================
ntfs: (device loop0): load_system_files(): Failed to load $MFTMirr.  Mounting read-only.  Run ntfsfix and/or chkdsk.
BUG: KASAN: use-after-free in ntfs_read_locked_inode+0x411a/0x51e0 fs/ntfs/inode.c:670
Read of size 8 at addr ffff88807f78d3d5 by task syz-executor.2/9897

CPU: 1 PID: 9897 Comm: syz-executor.2 Not tainted 4.19.170-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+0x17c/0x226 lib/dump_stack.c:118
 print_address_description.cold.6+0x9/0x211 mm/kasan/report.c:256
ntfs: (device loop0): map_mft_record_page(): Mft record 0xa is corrupt.  Run chkdsk.
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:443
ntfs: (device loop0): map_mft_record(): Failed with error code 5.
 ntfs_read_locked_inode+0x411a/0x51e0 fs/ntfs/inode.c:670
 ntfs_iget+0xe6/0x120 fs/ntfs/inode.c:190
ntfs: (device loop0): ntfs_read_locked_inode(): Failed with error code -5.  Marking corrupt inode 0xa as bad.  Run chkdsk.
 load_and_init_mft_mirror fs/ntfs/super.c:1041 [inline]
 load_system_files fs/ntfs/super.c:1786 [inline]
 ntfs_fill_super+0x13e3/0x79d0 fs/ntfs/super.c:2908
ntfs: (device loop0): load_and_init_upcase(): Failed to load $UpCase from the volume. Using default.
 mount_bdev+0x26f/0x330 fs/super.c:1158
 ntfs_mount+0x10/0x20 fs/ntfs/super.c:3065
 mount_fs+0x7f/0x2b0 fs/super.c:1261
 vfs_kern_mount.part.11+0x58/0x3d0 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2469 [inline]
 do_mount+0x376/0x2710 fs/namespace.c:2799
 ksys_mount+0xba/0xe0 fs/namespace.c:3015
 __do_sys_mount fs/namespace.c:3029 [inline]
 __se_sys_mount fs/namespace.c:3026 [inline]
 __x64_sys_mount+0xb9/0x150 fs/namespace.c:3026
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x460c7a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad 89 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 8a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007fe3d28d8a78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fe3d28d8b10 RCX: 0000000000460c7a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fe3d28d8ad0
RBP: 00007fe3d28d8ad0 R08: 00007fe3d28d8b10 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 000000002007dc00

The buggy address belongs to the page:
page:ffffea0001fde340 count:0 mapcount:0 mapping:0000000000000000 index:0x1
flags: 0xfff00000000000()
raw: 00fff00000000000 ffffea0001fde4c8 ffffea0001fde148 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88807f78d280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88807f78d300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88807f78d380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                 ^
 ffff88807f78d400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88807f78d480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready