Red Hat Bugzilla – Bug 995775
mozjs crashes when using non-64k page size (32-bit etc...)
Last modified: 2015-06-29 08:15:46 EDT
Description of problem:
This also causes polkitd to die since it uses mozjs. The bug has to do
with hard coded page sizes at compile time. A fix is available
Which needs to be backported (I'm told it was backported to xulrunner but
mozjs was missed)
Version-Release number of selected component (if applicable):
100%. Use a 4k base page size kernel, run fc19 polkitd -> segfault
Steps to Reproduce:
Any change we can move to mozilla 24 for mozjs on Fedora? It has much better support for multiple page sizes and it should be the next ESR.
(In reply to Gustavo Luiz Duarte from comment #1)
> Any change we can move to mozilla 24 for mozjs on Fedora? It has much better
> support for multiple page sizes and it should be the next ESR.
Someone would have to just dive in and get a new standalone spidermonkey ESR release, and then gjs would have to be ported. I'm not aware of anyone who is likely to do this in the near future, but I'd help review gjs changes if someone wanted to do it.
Is this perhaps what is causing the below?
[306275.869616] traps: polkitd general protection ip:7f646bc139d2 sp:7fff7f560440 error:0 in libmozjs-17.0.so[7f646badc000+3a7000]
[315567.773954] traps: polkitd general protection ip:7fd21433c9d2 sp:7fffd322d030 error:0 in libmozjs-17.0.so[7fd214205000+3a7000]
[324857.905651] traps: polkitd general protection ip:7fef173369d2 sp:7fff68698000 error:0 in libmozjs-17.0.so[7fef171ff000+3a7000]
[333851.798704] traps: polkitd general protection ip:7ffdd4b309d2 sp:7fff1a52cd30 error:0 in libmozjs-17.0.so[7ffdd49f9000+3a7000]
[343143.941242] traps: polkitd general protection ip:7f1d30c139d2 sp:7fff1c27d6c0 error:0 in libmozjs-17.0.so[7f1d30adc000+3a7000]
[353034.214826] traps: polkitd general protection ip:7f393eeb39d2 sp:7fff62bd4190 error:0 in libmozjs-17.0.so[7f393ed7c000+3a7000]
[362326.405240] traps: polkitd general protection ip:7fc6b9c3e9d2 sp:7fff4285f4a0 error:0 in libmozjs-17.0.so[7fc6b9b07000+3a7000]
This is indeed one of the symptoms
A patch named mozbug746112-no-decommit-on-large-pages.patch was added in mozjs17-17.0.0-6 to address this on ppc64, at least that's how I read it. See bz #971519. Unfortunately, this breaks 32bit ppc. Removing the patch makes polkitd stop segfaulting in mozjs17 again on my G3 iBook.
Note that there are a few tests that fails in make check (I just skipped make check to get a working package). I guess someone should have a look at that as well.
Please exclude that patch mozbug746112-no-decommit-on-large-pages.patch on 32bit ppc.
*** Bug 1132537 has been marked as a duplicate of this bug. ***
Ingvar's adivce, also worked for me.
I added a patch for mozjs17-17.0.0-11.fc21 to repair the large page problem on ppc32 (powerpc32-non64k-page.patch) and a further one for the spec-file (mozjs17-spec-ppc.patch), which also skips 'make check'
As already noticed by Ingvar, a few checks fail, if one would perform the check. The building errors of 'make -C js/src check' are in mozfailure.txt
Created attachment 929721 [details]
64k page shifts only on ppc64
Created attachment 929722 [details]
Patch for the spec-file (skips checks on ppc)
Created attachment 929723 [details]
Check failures on powerpc32
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