XFS (loop5): Mounting V4 Filesystem
XFS (loop5): empty log check failed
XFS (loop5): log mount/recovery failed: error -5
XFS (loop5): log mount failed
==================================================================
BUG: KCSAN: data-race in blk_stat_add / enqueue_timer

read to 0xffff88812a3fd498 of 8 bytes by interrupt on cpu 1:
 blk_stat_is_active block/blk-stat.h:131 [inline]
 blk_stat_add+0xc9/0x290 block/blk-stat.c:65
 __blk_mq_end_request block/blk-mq.c:549 [inline]
 blk_mq_end_request+0x256/0x2b0 block/blk-mq.c:570
 lo_complete_rq+0x136/0x1a0 drivers/block/loop.c:485
 blk_done_softirq+0x1eb/0x250 block/blk-softirq.c:37
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 run_ksoftirqd+0x46/0x60 kernel/softirq.c:603
 smpboot_thread_fn+0x37d/0x4a0 kernel/smpboot.c:165
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

write to 0xffff88812a3fd498 of 8 bytes by task 13326 on cpu 0:
 hlist_add_head include/linux/list.h:789 [inline]
 enqueue_timer+0x9c/0x210 kernel/time/timer.c:540
 __internal_add_timer+0x4f/0x60 kernel/time/timer.c:553
 internal_add_timer kernel/time/timer.c:595 [inline]
 __mod_timer kernel/time/timer.c:1053 [inline]
 mod_timer+0x303/0x7a0 kernel/time/timer.c:1100
 blk_stat_activate_nsecs block/blk-stat.h:145 [inline]
 rwb_arm_timer+0x98/0xf0 block/blk-wbt.c:349
 wbt_wait+0x190/0x250 block/blk-wbt.c:594
 __rq_qos_throttle+0x47/0x70 block/blk-rq-qos.c:72
 rq_qos_throttle block/blk-rq-qos.h:182 [inline]
 blk_mq_make_request+0x29c/0xf60 block/blk-mq.c:1971
 generic_make_request block/blk-core.c:1064 [inline]
 generic_make_request+0x196/0x740 block/blk-core.c:1006
 submit_bio+0x96/0x3c0 block/blk-core.c:1190
 submit_bio_wait+0xb8/0x100 block/bio.c:972
 blkdev_issue_flush+0x163/0x1c0 block/blk-flush.c:459
 xfs_blkdev_issue_flush+0x2f/0x40 fs/xfs/xfs_super.c:658
 xfs_free_buftarg+0x43/0x60 fs/xfs/xfs_buf.c:1706
 xfs_close_devices+0x123/0x140 fs/xfs/xfs_super.c:683
 xfs_fs_fill_super+0x656/0xe30 fs/xfs/xfs_super.c:1760
 mount_bdev+0x262/0x2d0 fs/super.c:1415
 xfs_fs_mount+0x3e/0x60 fs/xfs/xfs_super.c:1806
 legacy_get_tree+0x7e/0xf0 fs/fs_context.c:647
 vfs_get_tree+0x56/0x1a0 fs/super.c:1545
 do_new_mount fs/namespace.c:2822 [inline]
 do_mount+0x1004/0x14f0 fs/namespace.c:3142
 ksys_mount+0xe8/0x160 fs/namespace.c:3351
 __do_sys_mount fs/namespace.c:3365 [inline]
 __se_sys_mount fs/namespace.c:3362 [inline]
 __x64_sys_mount+0x70/0x90 fs/namespace.c:3362
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13326 Comm: syz-executor.5 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================