[bug #35263] libobjc2 can enter a deadlock during dtable initialization

[Morten Hustveit]

Follow-up Comment #5, bug #35263 (project gnustep):

To assist with reproducing the second test case, I have created a virtual
machine image (630 MB bzip2) containing Debian sid, GNUstep from SVN and the
test case.  Here is how you download and run the image:

On the host computer:

  1. wget http://www.ping.uio.no/~mortehu/gnustep-test.img.bz2 -O- | bunzip2 >
gnustep-test.img

  2. sudo -E kvm -drive if=virtio,file=gnustep-test.img,media=disk -smp 2

On the virtual machine:

  1. Log in as "user" (no password)

  2. while true; do ./libobjc2-deadlock-2; echo -n .; done

Some observations:

  * When I dropped the "-smp 2" option to kvm, the test case deadlocked on 20
out of 20 runs

  * With the "-smp 2" option, the test case can take several hundred runs
between each deadlock on my computer

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  <http://savannah.gnu.org/bugs/?35263>

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