S390x build of openjdk crashes with the segmentation fault

[Vladimir Petko]

See https://launchpadlibrarian.net/771962104/buildlog_ubuntu-plucky-s390x.openjdk-23_23.0.2+7~us1-0ubuntu1~ppa2_BUILDING.txt.gz

The issue is present on launchpad builder version of QEMU (jammy):
qemu binaries: 1:6.2+dfsg-2ubuntu6.22
libvirt-daemon-driver-qemu: 8.0.0-1ubuntu7.10

The crash (though different) is present in 1:8.2.2+ds-0ubuntu1.4 (noble).

The issue is not present when testing on actual hardware.
The issue is not present in 1:9.0.2+ds-4ubuntu5.1 (oracular)

[Launchpad Janitor (janitor)]

This bug was fixed in the package openjdk-23 - 23.0.2+7-1ubuntu1

---------------
openjdk-23 (23.0.2+7-1ubuntu1) plucky; urgency=medium

  * d/rules: disable dtrace on jammy armhf (LP: #2091226).
  * d/t/problems.csv: fix typo - remove jdk prefix for
    sun/security/util/Debug/DebugOptions.java.

 -- Vladimir Petko <email address hidden> Fri, 24 Jan 2025 11:58:07 +1300

[Vladimir Petko (vpa1977)]

I have ran build inside jammy qemu vm on jammy host and the build succeeded. Probably there is something specific in the setup of launchpad builders that trigger the issue.

[Frank Heimes (fheimes)]

Hmm, maybe due to kernel differences?
Or maybe because qemu is started in a different way (different options)?

[Vladimir Petko (vpa1977)]

The kernel in build image is:

Kernel: Linux 5.4.0-204-generic #224-Ubuntu SMP Thu Dec 5 13:30:37 UTC 2024 s390x (s390x)

The kernel in qemu image is:
 [ 1.740851] Linux version 5.15.0-130-generic (buildd@bos03-s390x-007) (gcc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0, GNU ld (GNU Binutils for Ubuntu) 2.38) #140-Ubuntu SMP Wed Dec 18 17:58:06 UTC 2024 (Ubuntu 5.15.0-130.140-generic 5.15.168)

Rest of the build environment matches.

Tried with focal cloud image (kernel Linux ubu-vm-08 5.4.0-205-generic #225-Ubuntu SMP Fri Jan 10 22:22:54 UTC 2025 s390x s390x s390x GNU/Linux) - build passes

[Vladimir Petko (vpa1977)]

Rebuilding openjdk using provided lp build image succeeded.

The only difference is kernel versions on host:
 - test host 5.15.130 vs lp host 5.15.122

[Vladimir Petko (vpa1977)]

The issue can be worked around on the builder image by increasing the stack size: https://launchpad.net/~vpa1977/+archive/ubuntu/october-21/+build/30168454

[Vladimir Petko (vpa1977)]

The confusing part is that openjdk-23 started building again without any workarounds.
I will keep this bug around to track rolling them back.

[Vladimir Petko (vpa1977)]

I have got another set of JVM crashes in openjdk-25 during the early access rebuild for April 2025 Security Release[1].

The openjdk packaging uses following vendor CPU flags: "-march=z13 -mtune=z15".
I have reset it to the openjdk default of "-march=z10" and was able to build opendjdk without the issue[2]

[1] https://launchpadlibrarian.net/781025993/buildlog_ubuntu-plucky-s390x.openjdk-25_25~13ea-1~ppa15_BUILDING.txt.gz
[2] https://launchpadlibrarian.net/781211760/buildlog_ubuntu-plucky-s390x.openjdk-25_25~13ea-1~ppa21_BUILDING.txt.gz