Bug 451831

Summary: altivec detection breaks
Product: [Fedora] Fedora Reporter: David Woodhouse <dwmw2>
Component: pixmanAssignee: Adam Jackson <ajax>
Status: CLOSED RAWHIDE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: low Docs Contact:
Priority: low    
Version: rawhideCC: kevin
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OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2008-06-19 17:37:02 UTC Type: ---
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Description David Woodhouse 2008-06-17 17:43:18 UTC 
A bunch of builds in rawhide have got 'stuck' when running doxygen, and strace
showed that it was in an endless loop catching SIGILL...

[pid  1268] --- SIGILL (Illegal instruction) @ 0 (0) ---
[pid  1268] rt_sigreturn(0x4)           = 0
[pid  1268] --- SIGILL (Illegal instruction) @ 0 (0) ---
[pid  1268] rt_sigreturn(0x4)           = 0
[pid  1268] --- SIGILL (Illegal instruction) @ 0 (0) ---

Further investigation tracked it down to the Altivec detection in libpixman. We
don't need to play tricks with catching SIGILL to tell whether the host has
Altivec -- it's in the auxvec. Patch attached.
Comment 1 David Woodhouse 2008-06-17 17:43:19 UTC 
Created attachment 309644 [details]
patch
Comment 2 Kevin Kofler 2008-06-18 01:08:56 UTC 
Builds still fail in current dist-f10, when can we expect a fixed pixman in the 
buildroots?
Comment 3 David Woodhouse 2008-06-18 08:04:03 UTC 
Er, really? I put libburn through yesterday after waiting for the new pixman to
hit the build repo, and it built fine. What package(s) are you still seeing
problems with?

Can you confirm the problem is the same? You can do this in the build system --
see https://www.redhat.com/archives/fedora-devel-list/2008-June/msg00995.html
for an example (don't forget to BR strace/expect/gdb or whatever you use).
Comment 4 Kevin Kofler 2008-06-18 08:06:40 UTC 
kdepimlibs is still getting stuck: 
http://koji.fedoraproject.org/koji/buildinfo?buildID=52836
Comment 5 David Woodhouse 2008-06-18 09:17:21 UTC 
Looks like it was still making progress when it got cancelled. A test build
(doing just the docs, to speed it up) completed successfully:
http://koji.fedoraproject.org/koji/taskinfo?taskID=667766

I'm doing another test build including the binaries now.

I wonder if the builder is just a little slow -- perhaps because it's got a
whole bunch of tasks chewing CPU by taking SIGILL and returning from it over and
over again... :)
Comment 6 David Woodhouse 2008-06-18 11:35:19 UTC 
667953 build (dist-f10, devel:kdepimlibs-4_0_82-1_fc10) completed successfully
Comment 7 Adam Jackson 2008-06-19 17:37:02 UTC 
Fixed pixman appears to be in the buildroot, closing.