Your message dated Thu, 8 Feb 2024 13:34:45 +0000
with message-id
<ca+crswmxv8izhwtkw4ugn2wfdgcyfo8f2sj_ep0wclomdac...@mail.gmail.com>
and subject line Re: Bug#1062654: openjdk-17-jre-headless: Segfault in
jspawnhelper
has caused the Debian Bug report #1062654,
regarding openjdk-17-jre-headless: Segfault in jspawnhelper
to be marked as done.
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If this is not the case it is now your responsibility to reopen the
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--
1062654: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1062654
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: openjdk-17-jre-headless
Version: 17.0.10+7-1~deb12u1
Severity: important
In 17.0.10+7-1~deb12u1 from bookworm-security, jspawnhelper segfaults
on startup.
$ /usr/lib/jvm/java-17-openjdk-amd64/lib/jspawnhelper
Segmentation fault
In real applications, this manifests as a failure to spawn subprocesses.
With 17.0.9+9-1~deb12u1 from bookworm, jspawnhelper shows an
informational message when run directly.
$ /usr/lib/jvm/java-17-openjdk-amd64/lib/jspawnhelper
This command is not for general use and should only be run as the
result of a call to
ProcessBuilder.start() or Runtime.exec() in a java application
-- System Information:
Debian Release: 12.4
APT prefers stable-security
APT policy: (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 6.1.0-17-amd64 (SMP w/2 CPU threads; PREEMPT)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8),
LANGUAGE=en_GB:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages openjdk-17-jdk-headless depends on:
ii libc6 2.36-9+deb12u4
ii openjdk-17-jre-headless 17.0.10+7-1~deb12u1
ii zlib1g 1:1.2.13.dfsg-1
openjdk-17-jdk-headless recommends no packages.
Versions of packages openjdk-17-jdk-headless suggests:
pn openjdk-17-demo <none>
pn openjdk-17-source <none>
--- End Message ---
--- Begin Message ---
On Wed, 7 Feb 2024 at 17:12, Sebastian Andrzej Siewior <
[email protected]> wrote:
> You can install the upgrade and then you need to restart everything java
> related that is still running and using the old java version.
>
Thanks for the tip. The relevant change is
https://github.com/openjdk/jdk17u/commit/cd6cb730c934d8e16d4bd8e3342e59e806f158f9,
which causes jspawnhelper to read its argument from argv[1] rather than
whatever the last argument happens to be. There is a corresponding change
in the JVM to pass the FD numbers in argv[1] rather than argv[0]. This
explains why I wasn't able to reproduce the crash in a standalone Java
program.
The segfault when invoking jspawnhelper directly is because argv[1] is used
without first checking that argc >= 2, so when invoked with no arguments
the program reads 1 past the end of argv and then passes the result to
sscanf. Not great, but not a problem in normal usage.
– Will
--- End Message ---
