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How to configure firefox to handle ENOSPC on fork gracefully?

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firefox.com54
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In case user network namespace are disabled on linux, fork return ENOSPC, as the user network namespaces are exhausted (as the limit is set to 0 [1,2]).

It would be great if there would be a work around for such a situation that user network namespaces are disabled. It would be even better if firefox could handle that situation gracefully and run without `CLONE_NEWNET` automatically.

The output is:

``` [Parent 5699, IPC Launch] WARNING: fork() failed: No space left on device: file /builddir/build/BUILD/firefox-112.0.2/ipc/chromium/src/base/process_util_linux.cc:273 [Parent 5699, IPC I/O Parent] WARNING: Failed to launch tab subprocess: file /builddir/build/BUILD/firefox-112.0.2/ipc/glue/GeckoChildProcessHost.cpp:800 ``` Note that " No space left on device" is wrong, it is about the limit in terms of user network namespaces.

Best, David

[1] https://apptainer.org/docs/admin/main/user_namespace.html#disabling-network-namespaces [2] https://docs.mpcdf.mpg.de/faq/hpc_software.html#why-do-certain-gui-applications-not-work-any-more-on-the-login-nodes-of-hpc-clusters-what-are-the-alternatives

In case user network namespace are disabled on linux, fork return ENOSPC, as the user network namespaces are exhausted (as the limit is set to 0 [1,2]). It would be great if there would be a work around for such a situation that user network namespaces are disabled. It would be even better if firefox could handle that situation gracefully and run without `CLONE_NEWNET` automatically. The output is: ``` [Parent 5699, IPC Launch] WARNING: fork() failed: No space left on device: file /builddir/build/BUILD/firefox-112.0.2/ipc/chromium/src/base/process_util_linux.cc:273 [Parent 5699, IPC I/O Parent] WARNING: Failed to launch tab subprocess: file /builddir/build/BUILD/firefox-112.0.2/ipc/glue/GeckoChildProcessHost.cpp:800 ``` Note that " No space left on device" is wrong, it is about the limit in terms of user network namespaces. Best, David [1] https://apptainer.org/docs/admin/main/user_namespace.html#disabling-network-namespaces [2] https://docs.mpcdf.mpg.de/faq/hpc_software.html#why-do-certain-gui-applications-not-work-any-more-on-the-login-nodes-of-hpc-clusters-what-are-the-alternatives