All of lore.kernel.org
 help / color / mirror / Atom feed
From: "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca>
To: Laibin Qiu <qiulaibin@huawei.com>,
	axboe@kernel.dk,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	linux-block@vger.kernel.org
Cc: john.garry@huawei.com, ming.lei@redhat.com,
	martin.petersen@oracle.com, hare@suse.de,
	akpm@linux-foundation.org, bvanassche@acm.org,
	linux-kernel@vger.kernel.org
Subject: "blk-mq: fix tag_get wait task can't be awakened" causes hangs
Date: Mon, 24 Jan 2022 11:24:24 -0500	[thread overview]
Message-ID: <1643040870.3bwvk3sis4.none@localhost> (raw)
In-Reply-To: 1643040870.3bwvk3sis4.none.ref@localhost

Hi,

Recently on torvalds master, I/O on USB flash drives started hanging 
here:

task:systemd-udevd   state:D stack:    0 pid:  374 ppid:   347 flags:0x00004000
Call Trace:
 <TASK>
 ? __schedule+0x319/0x4a0
 ? schedule+0x77/0xa0
 ? io_schedule+0x43/0x60
 ? blk_mq_get_tag+0x175/0x2b0
 ? mempool_alloc+0x33/0x170
 ? init_wait_entry+0x30/0x30
 ? __blk_mq_alloc_requests+0x1b4/0x220
 ? blk_mq_submit_bio+0x213/0x490
 ? submit_bio_noacct+0x22c/0x270
 ? xa_load+0x48/0x80
 ? mpage_readahead+0x114/0x130
 ? blkdev_fallocate+0x170/0x170
 ? read_pages+0x48/0x1d0
 ? page_cache_ra_unbounded+0xee/0x1f0
 ? force_page_cache_ra+0x68/0xc0
 ? filemap_read+0x18c/0x9a0
 ? blkdev_read_iter+0x4e/0x120
 ? vfs_read+0x265/0x2d0
 ? ksys_read+0x50/0xa0
 ? do_syscall_64+0x62/0x90
 ? do_user_addr_fault+0x271/0x3c0
 ? asm_exc_page_fault+0x8/0x30
 ? exc_page_fault+0x58/0x80
 ? entry_SYSCALL_64_after_hwframe+0x44/0xae
 </TASK>

mount(8) hangs with a similar backtrace, making the device effectively 
unusable. It does not seem to affect NVMe or SATA attached drives. The 
affected drive does not support UAS. I don't currently have UAS drives 
to test with. The default I/O scheduler is set to noop.

I found that reverting 180dccb0dba4 ("blk-mq: fix tag_get wait 
task can't be awakened") appears to resolve the issue.

Let me know what other information is needed.

Cheers,
Alex.

       reply	other threads:[~2022-01-24 16:24 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1643040870.3bwvk3sis4.none.ref@localhost>
2022-01-24 16:24 ` Alex Xu (Hello71) [this message]
2022-01-25  4:08   ` "blk-mq: fix tag_get wait task can't be awakened" causes hangs QiuLaibin
2022-01-25 15:15     ` Alex Xu (Hello71)
2022-01-26 13:38     ` Jens Axboe
2022-01-27  1:24       ` QiuLaibin
2022-01-25 11:38   ` Daniel Palmer

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1643040870.3bwvk3sis4.none@localhost \
    --to=alex_y_xu@yahoo.ca \
    --cc=akpm@linux-foundation.org \
    --cc=andriy.shevchenko@linux.intel.com \
    --cc=axboe@kernel.dk \
    --cc=bvanassche@acm.org \
    --cc=hare@suse.de \
    --cc=john.garry@huawei.com \
    --cc=linux-block@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=martin.petersen@oracle.com \
    --cc=ming.lei@redhat.com \
    --cc=qiulaibin@huawei.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.