Bug 816295 - Pressing ^C while yum is downloading deltas causes pycurl to deadlock
Pressing ^C while yum is downloading deltas causes pycurl to deadlock
Product: Fedora
Classification: Fedora
Component: yum-presto (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Jonathan Dieter
Fedora Extras Quality Assurance
Depends On:
  Show dependency treegraph
Reported: 2012-04-25 14:13 EDT by Garrett Holmstrom
Modified: 2013-02-13 09:55 EST (History)
7 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2013-02-13 09:55:47 EST
Type: Bug
Regression: ---
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Documentation: ---
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
gdb traceback from a deadlocked yum process (35.96 KB, text/plain)
2012-04-25 14:13 EDT, Garrett Holmstrom
no flags Details

  None (edit)
Description Garrett Holmstrom 2012-04-25 14:13:29 EDT
Created attachment 580228 [details]
gdb traceback from a deadlocked yum process

Description of problem:
Pressing ^C while yum downloads deltas seems to cause pycurl to deadlock while waiting on two different locks, neither of which appears to be the GIL.  (I could be wrong about that, though.)  strace says the process is stuck at "futex(0x87dffd0, FUTEX_WAIT_PRIVATE, 0, NULL".  See the attached backtrace for details.

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

How reproducible:
Always, at least on my system

Steps to Reproduce:
1. sudo yum upgrade
2. Press ^C while yum downloads deltas

Actual results:
Yum hangs

Expected results:
Yum changes mirrors
Comment 1 Garrett Holmstrom 2012-05-02 17:12:07 EDT
Reassigning to yum-presto based on yum developers' advice
Comment 2 Mads Kiilerich 2012-07-27 10:27:58 EDT
It is also not possible to interrupt the "rebuilding" phase which I assume don't involve curl and which I would assume used atomic renames for the generated output and thus securely could be interrupted at any point. The problem might thus be broader than described.
Comment 3 Fedora End Of Life 2013-01-16 08:59:08 EST
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Comment 4 Fedora End Of Life 2013-02-13 09:55:51 EST
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