Bug 1010392 - prelink causes python and others to crash on s390x
prelink causes python and others to crash on s390x
Product: Fedora
Classification: Fedora
Component: prelink (Show other bugs)
s390x Unspecified
unspecified Severity unspecified
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Assigned To: Jakub Jelinek
Fedora Extras Quality Assurance
Depends On: 1013801
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Reported: 2013-09-20 12:57 EDT by Richard Sandiford
Modified: 2015-02-18 06:14 EST (History)
2 users (show)

See Also:
Fixed In Version: prelink-0.5.0-3.el7
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2015-02-18 06:14:01 EST
Type: Bug
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
Suggested fix (518 bytes, patch)
2013-09-20 12:57 EDT, Richard Sandiford
no flags Details | Diff

  None (edit)
Description Richard Sandiford 2013-09-20 12:57:44 EDT
Created attachment 800574 [details]
Suggested fix

Description of problem:

  The prelinker causes several programs to crash on s390x.  The problem
  is that an R_390_IRELATIVE relocation for a memcpy IPLT in libc gets
  added to the conflict list as a normal R_390_64 relocation.  The IPLT
  then ends up calling the ifunc resolver rather than a real memcpy

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


Steps to Reproduce:

  From an un-prelinked state:

    $ sudo prelink /usr/bin/python
    $ python
    Segmentation fault (core dumped)
    $ sudo prelink -u /usr/bin/python
    $ python
    Python 2.7.5 (default, Aug 27 2013, 05:19:42)
    [GCC 4.8.1 20130603 (Red Hat 4.8.1-1)] on linux2
    Type "help", "copyright", "credits" or "license" for more information.

The attached patch fixes things for me.
Comment 1 Jakub Jelinek 2013-09-30 16:07:32 EDT
Looks correct, committed as r207 to prelink SVN.  Will try to add a testcase tomorrow.
Comment 2 Jakub Jelinek 2013-10-01 05:19:51 EDT
I've also committed s390 and s390x additions to testsuite/ifunc.h, with r207 reverted all the ifunc* tests FAIL on s390x, with r207 they all pass.
Comment 3 Jakub Jelinek 2013-10-05 11:20:39 EDT
There was a similar bug to this in s390 31-bit support, committed as r209.
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