bisecting fixing commit since a1b977b49b66c75e6c51a515f6700371ae720217 building syzkaller on 4a77ae0bdc5cd75ebe88ce7c896aae6bbf457a29 testing commit a1b977b49b66c75e6c51a515f6700371ae720217 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: b3e402e3c14bc141ed49d75b27ea51fe3950e83316773287aad50e97089e13ca all runs: crashed: KASAN: use-after-free Read in ntfs_are_names_equal testing current HEAD b172b44fcb1771e083aad806fa96f3f60e2ddfac testing commit b172b44fcb1771e083aad806fa96f3f60e2ddfac compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: a652959832180bc1f4a1ae531a3173f0313c3edc94cdade50145ed388f15f019 all runs: crashed: KASAN: use-after-free Read in ntfs_are_names_equal revisions tested: 2, total time: 28m37.055836306s (build: 21m29.568148905s, test: 6m38.435214673s) the crash still happens on HEAD commit msg: Linux 4.19.206 crash: KASAN: use-after-free Read in ntfs_are_names_equal IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready ntfs: (device loop0): map_mft_record_page(): Mft record 0x2 is corrupt. Run chkdsk. wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 ================================================================== IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready BUG: KASAN: use-after-free in ntfs_ucsncmp fs/ntfs/unistr.c:156 [inline] BUG: KASAN: use-after-free in ntfs_are_names_equal+0x178/0x1a0 fs/ntfs/unistr.c:75 Read of size 2 at addr ffff8881c9410ee8 by task syz-executor.0/7300 CPU: 0 PID: 7300 Comm: syz-executor.0 Not tainted 4.19.206-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 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:396 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:431 ntfs_ucsncmp fs/ntfs/unistr.c:156 [inline] ntfs_are_names_equal+0x178/0x1a0 fs/ntfs/unistr.c:75 IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready ntfs_attr_find+0x36c/0xb60 fs/ntfs/attrib.c:628 wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 ntfs_external_attr_find fs/ntfs/attrib.c:1107 [inline] ntfs_attr_lookup+0x1077/0x2590 fs/ntfs/attrib.c:1205 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 ntfs_read_locked_attr_inode fs/ntfs/inode.c:1264 [inline] ntfs_attr_iget+0x702/0x2370 fs/ntfs/inode.c:251 ntfs_read_locked_inode+0x24b9/0x5030 fs/ntfs/inode.c:985 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 ntfs_iget+0xe6/0x120 fs/ntfs/inode.c:190 load_system_files fs/ntfs/super.c:1988 [inline] ntfs_fill_super+0x4b4f/0x79c0 fs/ntfs/super.c:2908 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready 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:2492 [inline] do_mount+0x376/0x2630 fs/namespace.c:2822 ksys_mount+0xb1/0xd0 fs/namespace.c:3038 __do_sys_mount fs/namespace.c:3052 [inline] __se_sys_mount fs/namespace.c:3049 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3049 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x466d6a Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6c4ccdefa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000466d6a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f6c4ccdf000 RBP: 00007f6c4ccdf040 R08: 00007f6c4ccdf040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f6c4ccdf000 R15: 000000002007dc00 The buggy address belongs to the page: page:ffffea0007250400 count:2 mapcount:0 mapping:ffff8881e545dc60 index:0x2699 flags: 0x17ffe0000001074(referenced|dirty|lru|active|private) raw: 017ffe0000001074 ffffea00072503c8 ffffea00073876c8 ffff8881e545dc60 raw: 0000000000002699 ffff8881c9a51bd0 00000002ffffffff ffff8881f5222a40 page dumped because: kasan: bad access detected page->mem_cgroup:ffff8881f5222a40 Memory state around the buggy address: ffff8881c9410d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881c9410e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881c9410e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8881c9410f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881c9410f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. __ntfs_warning: 1526 callbacks suppressed ntfs: (device loop5): is_boot_sector_ntfs(): Invalid end of sector marker. ntfs: (device loop4): map_mft_record_page(): Mft record 0x2 is corrupt. Run chkdsk. ntfs: (device loop1): is_boot_sector_ntfs(): Invalid end of sector marker. ntfs: (device loop0): map_mft_record_page(): Mft record 0x1 is corrupt. Run chkdsk. ntfs: (device loop1): map_mft_record_page(): Mft record 0x1 is corrupt. Run chkdsk. ntfs: (device loop4): map_mft_record(): Failed with error code 5. ntfs: (device loop1): map_mft_record(): Failed with error code 5. ntfs: (device loop4): ntfs_read_locked_inode(): Failed with error code -5. Marking corrupt inode 0x2 as bad. Run chkdsk. ntfs: (device loop0): map_mft_record(): Failed with error code 5. ntfs: (device loop4): load_system_files(): Failed to load $LogFile. Will not be able to remount read-write. Mount in Windows. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. __ntfs_error: 1893 callbacks suppressed ntfs: (device loop0): map_mft_record_page(): Mft record 0x2 is corrupt. Run chkdsk. ntfs: (device loop0): map_mft_record(): Failed with error code 5. ntfs: (device loop0): ntfs_read_locked_inode(): Failed with error code -5. Marking corrupt inode 0x2 as bad. Run chkdsk. ntfs: (device loop0): load_system_files(): Failed to load $LogFile. Will not be able to remount read-write. Mount in Windows. ntfs: (device loop4): is_boot_sector_ntfs(): Invalid end of sector marker. ntfs: (device loop0): ntfs_read_locked_attr_inode(): Failed with error code -2 while reading attribute inode (mft_no 0x5, type 0xb0, name_len 4). Marking corrupt inode and base inode 0x5 as bad. Run chkdsk. ntfs: (device loop4): map_mft_record_page(): Mft record 0x1 is corrupt. Run chkdsk. ntfs: (device loop0): ntfs_read_locked_inode(): Failed to get bitmap attribute. ntfs: (device loop4): map_mft_record(): Failed with error code 5. ntfs: (device loop0): ntfs_read_locked_inode(): Failed with error code -2. Marking corrupt inode 0x5 as bad. Run chkdsk. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1. ntfs: volume version 3.1.