XFS (loop1): log mount failed
XFS (loop1): Mounting V4 Filesystem
==================================================================
BUG: KASAN: use-after-free in xlog_alloc_log+0x1386/0x14b0 fs/xfs/xfs_log.c:1542
Read of size 8 at addr ffff8880969e9090 by task syz-executor.1/9428

CPU: 0 PID: 9428 Comm: syz-executor.1 Not tainted 5.4.0-next-20191129-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+0x197/0x210 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:638
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
 xlog_alloc_log+0x1386/0x14b0 fs/xfs/xfs_log.c:1542
 xfs_log_mount+0xdc/0x780 fs/xfs/xfs_log.c:653
 xfs_mountfs+0xc35/0x1ca0 fs/xfs/xfs_mount.c:775
 xfs_fc_fill_super+0x84e/0x11c0 fs/xfs/xfs_super.c:1506
 get_tree_bdev+0x414/0x650 fs/super.c:1340
 xfs_fc_get_tree+0x1d/0x30 fs/xfs/xfs_super.c:1550
 vfs_get_tree+0x8e/0x300 fs/super.c:1545
 do_new_mount fs/namespace.c:2822 [inline]
 do_mount+0x135a/0x1b50 fs/namespace.c:3142
 ksys_mount+0xdb/0x150 fs/namespace.c:3351
 __do_sys_mount fs/namespace.c:3365 [inline]
 __se_sys_mount fs/namespace.c:3362 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3362
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45d0ca
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 4d 8c 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 2a 8c fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f54e5ebba88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f54e5ebbb40 RCX: 000000000045d0ca
RDX: 00007f54e5ebbae0 RSI: 0000000020000100 RDI: 00007f54e5ebbb00
RBP: 0000000000000001 R08: 00007f54e5ebbb40 R09: 00007f54e5ebbae0
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003
R13: 00000000004ca9b9 R14: 00000000004e3bb0 R15: 00000000ffffffff

Allocated by task 9428:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_kmalloc mm/kasan/common.c:512 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:485
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:526
 __do_kmalloc mm/slab.c:3656 [inline]
 __kmalloc+0x163/0x770 mm/slab.c:3665
 kmalloc include/linux/slab.h:561 [inline]
 kmem_alloc+0x15b/0x4d0 fs/xfs/kmem.c:21
 kmem_zalloc fs/xfs/kmem.h:68 [inline]
 xlog_alloc_log+0xcc3/0x14b0 fs/xfs/xfs_log.c:1484
 xfs_log_mount+0xdc/0x780 fs/xfs/xfs_log.c:653
 xfs_mountfs+0xc35/0x1ca0 fs/xfs/xfs_mount.c:775
 xfs_fc_fill_super+0x84e/0x11c0 fs/xfs/xfs_super.c:1506
 get_tree_bdev+0x414/0x650 fs/super.c:1340
 xfs_fc_get_tree+0x1d/0x30 fs/xfs/xfs_super.c:1550
 vfs_get_tree+0x8e/0x300 fs/super.c:1545
 do_new_mount fs/namespace.c:2822 [inline]
 do_mount+0x135a/0x1b50 fs/namespace.c:3142
 ksys_mount+0xdb/0x150 fs/namespace.c:3351
 __do_sys_mount fs/namespace.c:3365 [inline]
 __se_sys_mount fs/namespace.c:3362 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3362
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 9428:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 kasan_set_free_info mm/kasan/common.c:334 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:473
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:482
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x2c0 mm/slab.c:3757
 kvfree+0x61/0x70 mm/util.c:603
 kmem_free fs/xfs/kmem.h:61 [inline]
 xlog_alloc_log+0xeaa/0x14b0 fs/xfs/xfs_log.c:1544
 xfs_log_mount+0xdc/0x780 fs/xfs/xfs_log.c:653
 xfs_mountfs+0xc35/0x1ca0 fs/xfs/xfs_mount.c:775
 xfs_fc_fill_super+0x84e/0x11c0 fs/xfs/xfs_super.c:1506
 get_tree_bdev+0x414/0x650 fs/super.c:1340
 xfs_fc_get_tree+0x1d/0x30 fs/xfs/xfs_super.c:1550
 vfs_get_tree+0x8e/0x300 fs/super.c:1545
 do_new_mount fs/namespace.c:2822 [inline]
 do_mount+0x135a/0x1b50 fs/namespace.c:3142
 ksys_mount+0xdb/0x150 fs/namespace.c:3351
 __do_sys_mount fs/namespace.c:3365 [inline]
 __se_sys_mount fs/namespace.c:3362 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3362
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880969e9000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 144 bytes inside of
 1024-byte region [ffff8880969e9000, ffff8880969e9400)
The buggy address belongs to the page:
page:ffffea00025a7a40 refcount:1 mapcount:0 mapping:ffff8880aa000c40 index:0x0
raw: 00fffe0000000200 ffffea0002508b08 ffffea00029bb748 ffff8880aa000c40
raw: 0000000000000000 ffff8880969e9000 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880969e8f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880969e9000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880969e9080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff8880969e9100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880969e9180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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