Bug 101401 - rpm hang while installing package
rpm hang while installing package
Product: Red Hat Linux Beta
Classification: Retired
Component: rpm (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Jeff Johnson
Mike McLean
Depends On:
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Reported: 2003-07-31 14:19 EDT by Charlie Brady
Modified: 2007-04-18 12:56 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2003-07-31 14:50:29 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Charlie Brady 2003-07-31 14:19:27 EDT
Description of problem:

Hang occurred in Add/remove software widget (python 
SinglePackageWindow.py) on maybe fourth or fifth package installed. strace 

futex(0xbd0d2310, FUTEX_WAIT, 0, NULL

/var/lib/rpm/__db.00{1,2,3} existed. "rpm -qa" (and any other rpm operation)
then hung as well. Killing the process with -9, and removing the __db* files
allowed rpm to function again. 

I don't know whether this was reproducible or not, and I've now wiped the disk.
Comment 1 Charlie Brady 2003-07-31 14:27:35 EDT
It's relevant I'm sure that this was an upgrade from RH8, not a fresh install of
Severn, so the problem could be related to the existing rpm db files.
Comment 2 Jeff Johnson 2003-07-31 14:50:29 EDT
Yes, stale locks need to be manually removed after "kill -9".
There's no practical way to automate stale lock detection because
of races, i.e. detecting existence of locks and processes cannot
be done quickly enough, removing __db* files can/will introduce
windows where locking will not happen correctly. So "kill -9" cleanup
is left to the user as a pathological case.

Upgrade from RHL8 might be relevant, as glibc is changing the pthread
implementation foing from 8 -> 9. I know of no reproducible problems,
but odd corner cases, difficult to reproduce, might very well exist.

If you can reproduce a condition where stale locks are left, please
reopen this bug and I will try to analyze.

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