XFS (loop1): empty log check failed XFS (loop1): log mount/recovery failed: error -5 XFS (loop1): log mount failed XFS (loop1): Mounting V4 Filesystem ================================================================== BUG: KASAN: use-after-free in xlog_alloc_log+0x1266/0x1380 fs/xfs/xfs_log.c:1478 Read of size 8 at addr ffff8880926bc990 by task syz-executor.1/27844 CPU: 0 PID: 27844 Comm: syz-executor.1 Not tainted 5.2.0-rc7-next-20190701 #26 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351 __kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482 kasan_report+0x12/0x17 mm/kasan/common.c:614 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 xlog_alloc_log+0x1266/0x1380 fs/xfs/xfs_log.c:1478 xfs_log_mount+0xdc/0x780 fs/xfs/xfs_log.c:580 xfs_mountfs+0xdb9/0x1be0 fs/xfs/xfs_mount.c:815 xfs_fs_fill_super+0xcca/0x16e0 fs/xfs/xfs_super.c:1742 mount_bdev+0x304/0x3c0 fs/super.c:1346 xfs_fs_mount+0x35/0x40 fs/xfs/xfs_super.c:1816 legacy_get_tree+0x108/0x220 fs/fs_context.c:661 vfs_get_tree+0x8e/0x390 fs/super.c:1476 do_new_mount fs/namespace.c:2791 [inline] do_mount+0x138c/0x1c00 fs/namespace.c:3111 ksys_mount+0xdb/0x150 fs/namespace.c:3320 __do_sys_mount fs/namespace.c:3334 [inline] __se_sys_mount fs/namespace.c:3331 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3331 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c21a Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 9d 8d 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 7a 8d fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007f9e5afe9a88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f9e5afe9b40 RCX: 000000000045c21a RDX: 00007f9e5afe9ae0 RSI: 0000000020000000 RDI: 00007f9e5afe9b00 RBP: 0000000000000001 R08: 00007f9e5afe9b40 R09: 00007f9e5afe9ae0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003 R13: 00000000004c888d R14: 00000000004df4a0 R15: 00000000ffffffff Allocated by task 27844: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:503 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x163/0x770 mm/slab.c:3665 kmalloc include/linux/slab.h:556 [inline] kmem_alloc+0xd2/0x200 fs/xfs/kmem.c:24 kmem_zalloc fs/xfs/kmem.h:73 [inline] xlog_alloc_log+0xbf4/0x1380 fs/xfs/xfs_log.c:1420 xfs_log_mount+0xdc/0x780 fs/xfs/xfs_log.c:580 xfs_mountfs+0xdb9/0x1be0 fs/xfs/xfs_mount.c:815 xfs_fs_fill_super+0xcca/0x16e0 fs/xfs/xfs_super.c:1742 mount_bdev+0x304/0x3c0 fs/super.c:1346 xfs_fs_mount+0x35/0x40 fs/xfs/xfs_super.c:1816 legacy_get_tree+0x108/0x220 fs/fs_context.c:661 vfs_get_tree+0x8e/0x390 fs/super.c:1476 do_new_mount fs/namespace.c:2791 [inline] do_mount+0x138c/0x1c00 fs/namespace.c:3111 ksys_mount+0xdb/0x150 fs/namespace.c:3320 __do_sys_mount fs/namespace.c:3334 [inline] __se_sys_mount fs/namespace.c:3331 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3331 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 27844: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x2c0 mm/slab.c:3757 kvfree+0x61/0x70 mm/util.c:488 kmem_free fs/xfs/kmem.h:66 [inline] xlog_alloc_log+0xea9/0x1380 fs/xfs/xfs_log.c:1480 xfs_log_mount+0xdc/0x780 fs/xfs/xfs_log.c:580 xfs_mountfs+0xdb9/0x1be0 fs/xfs/xfs_mount.c:815 xfs_fs_fill_super+0xcca/0x16e0 fs/xfs/xfs_super.c:1742 mount_bdev+0x304/0x3c0 fs/super.c:1346 xfs_fs_mount+0x35/0x40 fs/xfs/xfs_super.c:1816 legacy_get_tree+0x108/0x220 fs/fs_context.c:661 vfs_get_tree+0x8e/0x390 fs/super.c:1476 do_new_mount fs/namespace.c:2791 [inline] do_mount+0x138c/0x1c00 fs/namespace.c:3111 ksys_mount+0xdb/0x150 fs/namespace.c:3320 __do_sys_mount fs/namespace.c:3334 [inline] __se_sys_mount fs/namespace.c:3331 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3331 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880926bc900 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 144 bytes inside of 1024-byte region [ffff8880926bc900, ffff8880926bcd00) The buggy address belongs to the page: page:ffffea000249af00 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0xffff8880926bc480 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00026f9688 ffffea0002171b88 ffff8880aa400c40 raw: ffff8880926bc480 ffff8880926bc000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880926bc880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880926bc900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880926bc980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880926bca00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880926bca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================