EXT4-fs (sda1): changing journal_checksum during remount not supported; ignoring ================================================================== BUG: KASAN: use-after-free in ext4_data_block_valid+0x2d5/0x330 fs/ext4/block_validity.c:211 Read of size 8 at addr ffff8881d1f94750 by task syz-executor4/6122 CPU: 1 PID: 6122 Comm: syz-executor4 Not tainted 4.20.0-rc5+ #362 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+0x244/0x39d lib/dump_stack.c:113 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 ext4_data_block_valid+0x2d5/0x330 fs/ext4/block_validity.c:211 __check_block_validity.constprop.80+0xc1/0x210 fs/ext4/inode.c:402 ext4_map_blocks+0x1021/0x1b50 fs/ext4/inode.c:592 ext4_getblk+0x4f2/0x630 fs/ext4/inode.c:966 ext4_bread+0x95/0x2b0 fs/ext4/inode.c:1016 __ext4_read_dirblock+0x37/0x960 fs/ext4/namei.c:101 htree_dirblock_to_tree+0x13a/0xae0 fs/ext4/namei.c:979 ext4_htree_fill_tree+0x40c/0xd60 fs/ext4/namei.c:1098 ext4_dx_readdir fs/ext4/dir.c:576 [inline] ext4_readdir+0x1ca1/0x3c30 fs/ext4/dir.c:121 iterate_dir+0x48c/0x5d0 fs/readdir.c:51 __do_sys_getdents fs/readdir.c:231 [inline] __se_sys_getdents fs/readdir.c:212 [inline] __x64_sys_getdents+0x29f/0x510 fs/readdir.c:212 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45594b Code: 02 74 b6 31 f6 eb b9 0f 1f 84 00 00 00 00 00 41 57 41 56 48 63 ff 41 55 41 54 b8 4e 00 00 00 55 53 48 89 f3 48 83 ec 08 0f 05 <48> 3d 00 f0 ff ff 77 55 4c 8d 24 06 49 89 c5 4c 39 e6 73 33 90 0f RSP: 002b:00007ffcb8495db0 EFLAGS: 00000202 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 0000000000f57970 RCX: 000000000045594b RDX: 0000000000008000 RSI: 0000000000f57970 RDI: 0000000000000003 RBP: 0000000000f57970 R08: 0000000000000001 R09: 0000000000f56940 R10: 0000000000000000 R11: 0000000000000202 R12: ffffffffffffffd4 R13: 0000000000000016 R14: 0000000000000000 R15: 0000000000000004 Allocated by task 1: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x730 mm/slab.c:3554 add_system_zone+0x2e5/0x5f0 fs/ext4/block_validity.c:85 ext4_setup_system_zone+0x208/0x520 fs/ext4/block_validity.c:169 ext4_fill_super+0x89ee/0xdbb0 fs/ext4/super.c:4384 mount_bdev+0x30c/0x3e0 fs/super.c:1158 ext4_mount+0x34/0x40 fs/ext4/super.c:5893 mount_fs+0xae/0x31d fs/super.c:1261 vfs_kern_mount.part.35+0xdc/0x4f0 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x581/0x31f0 fs/namespace.c:2801 ksys_mount+0x12d/0x140 fs/namespace.c:3017 do_mount_root+0x35/0x1d3 init/do_mounts.c:387 mount_block_root+0x39c/0x6ed init/do_mounts.c:416 mount_root+0x358/0x39f init/do_mounts.c:561 prepare_namespace+0x26c/0x2ab init/do_mounts.c:620 kernel_init_freeable+0x6a1/0x6bf init/main.c:1170 kernel_init+0x11/0x1ae init/main.c:1071 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Freed by task 7975: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x83/0x290 mm/slab.c:3760 ext4_release_system_zone+0x7c/0x110 fs/ext4/block_validity.c:187 ext4_setup_system_zone+0x3ef/0x520 fs/ext4/block_validity.c:151 ext4_remount+0x16fc/0x2980 fs/ext4/super.c:5338 do_remount_sb+0x350/0x7b0 fs/super.c:888 do_remount fs/namespace.c:2290 [inline] do_mount+0x1513/0x31f0 fs/namespace.c:2792 ksys_mount+0x12d/0x140 fs/namespace.c:3017 __do_sys_mount fs/namespace.c:3031 [inline] __se_sys_mount fs/namespace.c:3028 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3028 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8881d1f94738 which belongs to the cache ext4_system_zone of size 40 The buggy address is located 24 bytes inside of 40-byte region [ffff8881d1f94738, ffff8881d1f94760) The buggy address belongs to the page: page:ffffea000747e500 count:1 mapcount:0 mapping:ffff8881d445b600 index:0xffff8881d1f94fb9 flags: 0x2fffc0000000200(slab) raw: 02fffc0000000200 ffff8881d4461e38 ffff8881d4461e38 ffff8881d445b600 raw: ffff8881d1f94fb9 ffff8881d1f94000 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d1f94600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881d1f94680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881d1f94700: fc fc fc fc fc fc fc fb fb fb fb fb fc fc fb fb ^ ffff8881d1f94780: fb fb fb fc fc fb fb fb fb fb fc fc fb fb fb fb ffff8881d1f94800: fb fc fc fb fb fb fb fb fc fc fb fb fb fb fb fc ================================================================== EXT4-fs (sda1): re-mounted. Opts: dioread_nolock,journal_checksum,noblock_validity,noauto_da_alloc,stripe=0x0000000000000000,