XFS (loop1): Mounting V4 Filesystem
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BUG: KASAN: use-after-free in xlog_alloc_log+0x102b/0x11f0 fs/xfs/xfs_log.c:1471
Read of size 8 at addr ffff8880a922bbd0 by task syz-executor.1/11610

CPU: 0 PID: 11610 Comm: syz-executor.1 Not tainted 5.2.0+ #28
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+0x1d8/0x2f8 lib/dump_stack.c:113
 print_address_description+0x75/0x5b0 mm/kasan/report.c:351
 __kasan_report+0x14b/0x1c0 mm/kasan/report.c:482
 kasan_report+0x26/0x50 mm/kasan/common.c:612
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
 xlog_alloc_log+0x102b/0x11f0 fs/xfs/xfs_log.c:1471
 xfs_log_mount+0xc6/0x750 fs/xfs/xfs_log.c:576
 xfs_mountfs+0xcc4/0x1d50 fs/xfs/xfs_mount.c:811
 xfs_fs_fill_super+0x1035/0x1480 fs/xfs/xfs_super.c:1729
 mount_bdev+0x31c/0x440 fs/super.c:1346
 xfs_fs_mount+0x34/0x40 fs/xfs/xfs_super.c:1803
 legacy_get_tree+0xf9/0x1a0 fs/fs_context.c:661
 vfs_get_tree+0x8f/0x360 fs/super.c:1476
 do_new_mount fs/namespace.c:2792 [inline]
 do_mount+0x1813/0x2730 fs/namespace.c:3112
 ksys_mount+0xcc/0x100 fs/namespace.c:3321
 __do_sys_mount fs/namespace.c:3335 [inline]
 __se_sys_mount fs/namespace.c:3332 [inline]
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3332
 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c26a
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:00007f2c05750a88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f2c05750b40 RCX: 000000000045c26a
RDX: 00007f2c05750ae0 RSI: 0000000020000000 RDI: 00007f2c05750b00
RBP: 0000000000000001 R08: 00007f2c05750b40 R09: 00007f2c05750ae0
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000004
R13: 00000000004c88f7 R14: 00000000004df540 R15: 00000000ffffffff

Allocated by task 11610:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:487
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:501
 __do_kmalloc mm/slab.c:3655 [inline]
 __kmalloc+0x254/0x340 mm/slab.c:3664
 kmalloc include/linux/slab.h:557 [inline]
 kmem_alloc+0x5a0/0x6a0 fs/xfs/kmem.c:19
 kmem_zalloc fs/xfs/kmem.h:73 [inline]
 xlog_alloc_log+0x488/0x11f0 fs/xfs/xfs_log.c:1413
 xfs_log_mount+0xc6/0x750 fs/xfs/xfs_log.c:576
 xfs_mountfs+0xcc4/0x1d50 fs/xfs/xfs_mount.c:811
 xfs_fs_fill_super+0x1035/0x1480 fs/xfs/xfs_super.c:1729
 mount_bdev+0x31c/0x440 fs/super.c:1346
 xfs_fs_mount+0x34/0x40 fs/xfs/xfs_super.c:1803
 legacy_get_tree+0xf9/0x1a0 fs/fs_context.c:661
 vfs_get_tree+0x8f/0x360 fs/super.c:1476
 do_new_mount fs/namespace.c:2792 [inline]
 do_mount+0x1813/0x2730 fs/namespace.c:3112
 ksys_mount+0xcc/0x100 fs/namespace.c:3321
 __do_sys_mount fs/namespace.c:3335 [inline]
 __se_sys_mount fs/namespace.c:3332 [inline]
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3332
 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 11610:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 __kasan_slab_free+0x12a/0x1e0 mm/kasan/common.c:449
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:457
 __cache_free mm/slab.c:3425 [inline]
 kfree+0x115/0x200 mm/slab.c:3756
 kvfree+0x47/0x50 mm/util.c:413
 kmem_free fs/xfs/kmem.h:66 [inline]
 xlog_alloc_log+0x1069/0x11f0 fs/xfs/xfs_log.c:1473
 xfs_log_mount+0xc6/0x750 fs/xfs/xfs_log.c:576
 xfs_mountfs+0xcc4/0x1d50 fs/xfs/xfs_mount.c:811
 xfs_fs_fill_super+0x1035/0x1480 fs/xfs/xfs_super.c:1729
 mount_bdev+0x31c/0x440 fs/super.c:1346
 xfs_fs_mount+0x34/0x40 fs/xfs/xfs_super.c:1803
 legacy_get_tree+0xf9/0x1a0 fs/fs_context.c:661
 vfs_get_tree+0x8f/0x360 fs/super.c:1476
 do_new_mount fs/namespace.c:2792 [inline]
 do_mount+0x1813/0x2730 fs/namespace.c:3112
 ksys_mount+0xcc/0x100 fs/namespace.c:3321
 __do_sys_mount fs/namespace.c:3335 [inline]
 __se_sys_mount fs/namespace.c:3332 [inline]
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3332
 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a922bb40
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 144 bytes inside of
 1024-byte region [ffff8880a922bb40, ffff8880a922bf40)
The buggy address belongs to the page:
page:ffffea0002a48a80 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea00020c0588 ffffea00027fdc88 ffff8880aa400c40
raw: 0000000000000000 ffff8880a922a040 0000000100000007 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a922ba80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880a922bb00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff8880a922bb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff8880a922bc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a922bc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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