bisecting fixing commit since c196b3a9c83ae3491280b739d231d02b3cb9d041 building syzkaller on f80ce148aeb891e3335fb38ed9b48b005ca76529 testing commit c196b3a9c83ae3491280b739d231d02b3cb9d041 with gcc (GCC) 8.4.1 20210217 kernel signature: 798aa65dc4b45561a39f8671695801d8fd5423a5c0083f89e856d7044d08b08a run #0: crashed: KASAN: use-after-free Read in ntfs_iget run #1: crashed: KASAN: use-after-free Read in ntfs_iget run #2: crashed: KASAN: use-after-free Read in ntfs_iget run #3: crashed: KASAN: use-after-free Read in ntfs_iget run #4: crashed: KASAN: use-after-free Read in ntfs_iget run #5: crashed: KASAN: use-after-free Read in ntfs_iget run #6: crashed: KASAN: use-after-free Read in ntfs_iget run #7: crashed: KASAN: use-after-free Read in ntfs_iget run #8: crashed: KASAN: use-after-free Read in ntfs_iget run #9: crashed: KASAN: use-after-free Read in ntfs_iget run #10: crashed: KASAN: use-after-free Read in ntfs_iget run #11: crashed: KASAN: use-after-free Read in ntfs_iget run #12: crashed: KASAN: use-after-free Read in ntfs_iget run #13: crashed: KASAN: use-after-free Read in ntfs_iget run #14: crashed: KASAN: use-after-free Read in ntfs_iget run #15: crashed: KASAN: use-after-free Read in ntfs_iget run #16: crashed: KASAN: use-after-free Read in ntfs_iget run #17: crashed: KASAN: use-after-free Read in ntfs_iget run #18: crashed: KASAN: use-after-free Read in ntfs_iget run #19: crashed: KASAN: out-of-bounds Read in ntfs_iget testing current HEAD 29c52025152bab4c557d8174da58f1a4c8e70438 testing commit 29c52025152bab4c557d8174da58f1a4c8e70438 with gcc (GCC) 8.4.1 20210217 kernel signature: 2c257aac0c42529eedabc36b1086f62a1607ec15975edb0f76f27a88aa57b86d run #0: crashed: KASAN: use-after-free Read in ntfs_iget run #1: crashed: KASAN: use-after-free Read in ntfs_iget run #2: crashed: KASAN: use-after-free Read in ntfs_iget run #3: crashed: KASAN: use-after-free Read in ntfs_iget run #4: crashed: KASAN: use-after-free Read in ntfs_iget run #5: crashed: KASAN: out-of-bounds Read in ntfs_iget run #6: crashed: KASAN: use-after-free Read in ntfs_iget run #7: crashed: KASAN: use-after-free Read in ntfs_iget run #8: crashed: KASAN: use-after-free Read in ntfs_iget run #9: crashed: KASAN: out-of-bounds Read in ntfs_iget revisions tested: 2, total time: 20m43.407054446s (build: 13m36.963772857s, test: 6m10.035261506s) the crash still happens on HEAD commit msg: Linux 4.14.221 crash: KASAN: out-of-bounds Read in ntfs_iget IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready ntfs: (device loop2): is_boot_sector_ntfs(): Invalid end of sector marker. IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready ================================================================== BUG: KASAN: out-of-bounds in ntfs_read_locked_inode+0x41ad/0x51f0 fs/ntfs/inode.c:677 Read of size 8 at addr ffff888089af73d5 by task syz-executor.2/9646 CPU: 1 PID: 9646 Comm: syz-executor.2 Not tainted 4.14.221-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x14b/0x1e7 lib/dump_stack.c:58 print_address_description.cold.6+0x9/0x1ca mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold.7+0x11a/0x2d3 mm/kasan/report.c:393 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:440 ntfs_read_locked_inode+0x41ad/0x51f0 fs/ntfs/inode.c:677 ntfs_iget+0xda/0x110 fs/ntfs/inode.c:190 load_and_init_mft_mirror fs/ntfs/super.c:1041 [inline] load_system_files fs/ntfs/super.c:1786 [inline] ntfs_fill_super+0x13cf/0x76c0 fs/ntfs/super.c:2908 mount_bdev+0x26f/0x330 fs/super.c:1134 ntfs_mount+0x10/0x20 fs/ntfs/super.c:3065 mount_fs+0x7f/0x270 fs/super.c:1237 vfs_kern_mount.part.9+0x58/0x3c0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x352/0x2af0 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xb1/0xd0 fs/namespace.c:3072 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x466eda RSP: 002b:00007ff199515fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000466eda RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ff199516000 RBP: 00007ff199516040 R08: 00007ff199516040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 00007ff199516000 R15: 000000002007dc00 The buggy address belongs to the page: page:ffffea000226bdc0 count:1 mapcount:0 mapping:ffff8880ac21b848 index:0x68 flags: 0xfff0000004003c(referenced|uptodate|dirty|lru|swapbacked) raw: 00fff0000004003c ffff8880ac21b848 0000000000000068 00000001ffffffff raw: ffffea000226bda0 ffffea000226be20 0000000000000000 ffff8880b5fd4a00 page dumped because: kasan: bad access detected page->mem_cgroup:ffff8880b5fd4a00 Memory state around the buggy address: ffff888089af7280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888089af7300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888089af7380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888089af7400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888089af7480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready