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Bug 1065456 - Thin pool is not readable while waits for pool resize
Summary: Thin pool is not readable while waits for pool resize
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: lvm2
Version: 7.0
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Joe Thornber
QA Contact: cluster-qe@redhat.com
URL:
Whiteboard:
Depends On:
Blocks: 1119323
TreeView+ depends on / blocked
 
Reported: 2014-02-14 17:03 UTC by Zdenek Kabelac
Modified: 2021-09-03 12:50 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-12-15 07:29:34 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Zdenek Kabelac 2014-02-14 17:03:00 UTC 
Description of problem:

When the data space in thin pool is exhausted and pool waits for resize to get new free space to provision chunk - any try to read a thin volume seems to block as well.

Simple way to reproduce - create some thin LVs -

lvcreate -L10 -V20 -T vg/pool
lvcreate -V20 -T vg/pool

lvol1 & lvol2 should be available as thin volumes.
now fill  thin volume via 'dd'

dd if=/dev/zero of=/dev/vg/lvol1 bs=1M

(this should block waiting on resize when thin pool dmeventd monitoring is disabled (see lvm.conf monitoring option).

In this case any try to read from either lvol2 or lvol1 blocks.

Here is stack trace from blkid /dev/vg/lvol2:

blkid           D ffff88013594c980     0  1703  21936 0x00000000
 ffff8800166e5cd8 0000000000000046 ffff88011d0324c0 ffff8800166e5fd8
 00000000001d3e00 00000000001d3e00 ffff88011d0324c0 ffff8801375d4788
 ffff8800166e5d60 0000000000000082 ffffffff811517c0 ffff8800166e5d50
Call Trace:
 [<ffffffff811517c0>] ? sleep_on_page+0x20/0x20
 [<ffffffff815c65fd>] io_schedule+0x9d/0x140
 [<ffffffff811517ce>] sleep_on_page_killable+0xe/0x40
 [<ffffffff815c6b6b>] __wait_on_bit_lock+0x7b/0xc0
 [<ffffffff8115192a>] __lock_page_killable+0x6a/0x70
 [<ffffffff8109d710>] ? autoremove_wake_function+0x40/0x40
 [<ffffffff81154c98>] generic_file_aio_read+0x4a8/0x750
 [<ffffffff811fd1db>] blkdev_aio_read+0x4b/0x70
 [<ffffffff811bc60a>] do_sync_read+0x5a/0x90
 [<ffffffff811bccce>] vfs_read+0x9e/0x170
 [<ffffffff811bd7cc>] SyS_read+0x4c/0xa0
 [<ffffffff815d4c96>] system_call_fastpath+0x1a/0x1f


dd which is waiting for pool resize:

dd              D ffffffff81a114c0     0  1698   3195 0x00000000
 ffff8800683d7c58 0000000000000046 ffff880135964980 ffff8800683d7fd8
 00000000001d3e00 00000000001d3e00 ffff880135964980 ffff8801373d4788
 ffff88013bf908e8 0000000000000002 ffffffff811517a0 ffff8800683d7cd0
Call Trace:
 [<ffffffff811517a0>] ? wait_on_page_read+0x60/0x60
 [<ffffffff815c65fd>] io_schedule+0x9d/0x140
 [<ffffffff811517ae>] sleep_on_page+0xe/0x20
 [<ffffffff815c6a32>] __wait_on_bit+0x62/0x90
 [<ffffffff8115154f>] wait_on_page_bit+0x7f/0x90
 [<ffffffff8109d710>] ? autoremove_wake_function+0x40/0x40
 [<ffffffff81151661>] filemap_fdatawait_range+0x101/0x1b0
 [<ffffffff81151737>] filemap_fdatawait+0x27/0x30
 [<ffffffff8115374e>] filemap_write_and_wait+0x3e/0x60
 [<ffffffff811fd9af>] __sync_blockdev+0x1f/0x40
 [<ffffffff811fdd01>] __blkdev_put+0x61/0x1b0
 [<ffffffff811fe7d0>] blkdev_put+0x50/0x160
 [<ffffffff811fe998>] blkdev_close+0x28/0x30
 [<ffffffff811bea10>] __fput+0xf0/0x240
 [<ffffffff811bebae>] ____fput+0xe/0x10
 [<ffffffff8107399c>] task_work_run+0xac/0xe0
 [<ffffffff81002de1>] do_notify_resume+0x61/0xa0
 [<ffffffff815d4fa2>] int_signal+0x12/0x17




Version-Release number of selected component (if applicable):
dm thin pool target version 1.10

How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:
Volumes continue to be readable and block only when provisioning should happen.

Additional info:
Comment 2 RHEL Program Management 2014-03-22 06:01:12 UTC 
This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.
Comment 6 RHEL Program Management 2020-12-15 07:29:34 UTC 
After evaluating this issue, there are no plans to address it further or fix it in an upcoming release.  Therefore, it is being closed.  If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.
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