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Bug 2175017 - deadlock while reading amd maps
Summary: deadlock while reading amd maps
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: autofs
Version: 8.7
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Ian Kent
QA Contact: Kun Wang
URL:
Whiteboard:
Depends On:
Blocks: 2177998 2179753
TreeView+ depends on / blocked
 
Reported: 2023-03-02 21:29 UTC by Frank Sorenson
Modified: 2023-09-29 04:25 UTC (History)
7 users (show)

Fixed In Version: autofs-5.1.4-102.el8_8
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 2177998 2179753 (view as bug list)
Environment:
Last Closed: 2023-05-31 02:40:56 UTC
Type: Bug
Target Upstream Version:
Embargoed:
pm-rhel: mirror+

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-150534 0 None None None 2023-03-02 21:31:39 UTC

Description Frank Sorenson 2023-03-02 21:29:44 UTC 
Created attachment 1947589 [details]
core file of deadlocked automount process

Description of problem:

A deadlock can occur while reading amd maps, leading to hung automount process.



Version-Release number of selected component (if applicable):

autofs-5.1.4-88



How reproducible:

Unknown


Steps to Reproduce:

the 'reproducer' in bz2139504 can sometimes hit this deadlock


Actual results:

deadlock leads to unresponsive automount process

Expected results:

no deadlock



Additional info:

core file attached
Comment 3 Ian Kent 2023-03-03 08:07:17 UTC 
(In reply to Frank Sorenson from comment #0)
> Created attachment 1947589 [details]
> core file of deadlocked automount process
> 
> Description of problem:
> 
> A deadlock can occur while reading amd maps, leading to hung automount
> process.
> 
> 
> 
> Version-Release number of selected component (if applicable):
> 
> autofs-5.1.4-88
> 
> 
> 
> How reproducible:
> 
> Unknown
> 
> 
> Steps to Reproduce:
> 
> the 'reproducer' in bz2139504 can sometimes hit this deadlock

I think the reproducer may be encountering this problem more than you realise.

The way I discovered it was running the reproducer and terminating the test
before error conditions started occurring then waiting for the mounts to expire.
Fairly often I would see the mounts one level below the top level not able to
expire away, something I've started seeing for a while now, and looking at back
traces showed there was actually a deadlock occurring. Something I have missed
completely while working on this problem so far.

Ian
Comment 9 Ian Kent 2023-03-12 23:32:51 UTC 
I have a scratch build at
https://brew-task-repos.engineering.redhat.com/repos/scratch/ikent/autofs/5.1.4/101.el8/

It's just patch cleanups, mostly descriptions/spelling.
Please use this for testing.
Comment 10 Ian Kent 2023-03-12 23:36:04 UTC 
Kun,

Could you test this please, as in comment #5 we need that for the
exception review before this Thursday.
Comment 50 Red Hat Bugzilla 2023-09-29 04:25:10 UTC 
The needinfo request[s] on this closed bug have been removed as they have been unresolved for 120 days
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