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[GH-ISSUE #67] --private fails on linux-ck kernel (Arch Linux) #39

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opened 2026-05-05 04:50:07 -06:00 by gitea-mirror · 2 comments

gitea-mirror commented

2026-05-05 04:50:07 -06:00

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Originally created by @netblue30 on GitHub (Sep 24, 2015).
Original GitHub issue: https://github.com/netblue30/firejail/issues/67

Imported form reddit: https://www.reddit.com/r/linux/comments/3lt0p1/firejail_a_security_sandbox_for_mozilla_firefox/cvb3qo1

Originally created by @netblue30 on GitHub (Sep 24, 2015). Original GitHub issue: https://github.com/netblue30/firejail/issues/67 Imported form reddit: https://www.reddit.com/r/linux/comments/3lt0p1/firejail_a_security_sandbox_for_mozilla_firefox/cvb3qo1

gitea-mirror

2026-05-05 04:50:07 -06:00

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gitea-mirror commented

2026-05-05 04:50:16 -06:00

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@dosy4ev commented on GitHub (Sep 24, 2015):

I use stock archlinux kernel (4.1.6-1-ARCH at this moment) and I have this bug too.
So this isn't ck kernel specific.

--private works fine for some other app i've tried (pcmanfm, mc).

Output of firejail --noprofile --private firefox:

Parent pid 30062, child pid 30063
Child process initialized

(process:1): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed

parent is shutting down, bye...

After that firefox just starts as usual.

Firefox version is Mozilla Firefox 40.0.3. Firejail version is firejail version 0.9.30.

@dosy4ev commented on GitHub (Sep 24, 2015): I use stock archlinux kernel (`4.1.6-1-ARCH` at this moment) and I have this bug too. So this isn't ck kernel specific. `--private` works fine for some other app i've tried (pcmanfm, mc). Output of `firejail --noprofile --private firefox`: ``` Parent pid 30062, child pid 30063 Child process initialized (process:1): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed parent is shutting down, bye... ``` After that firefox just starts as usual. Firefox version is `Mozilla Firefox 40.0.3`. Firejail version is `firejail version 0.9.30`.

gitea-mirror commented

2026-05-05 04:50:20 -06:00

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@netblue30 commented on GitHub (Sep 26, 2015):

I think I know what's going on! It is Firefox imposing a single process instance in the system.

By default, the browser uses a single process to handle multiple windows. When you start the browser, if another Firefox process is already running, the existing process opens a new tab or a new window.

Make sure Firefox is not already running when you start it in Firejail sandbox, otherwise you end up with a new window running outside the sandbox. Chromium has the same problem, and quite a number of other programs, most notably file managers.

I'll close the bug for now, we can always reopen it if necessary.

@netblue30 commented on GitHub (Sep 26, 2015): I think I know what's going on! It is Firefox imposing a single process instance in the system. By default, the browser uses a single process to handle multiple windows. When you start the browser, if another Firefox process is already running, the existing process opens a new tab or a new window. Make sure Firefox is not already running when you start it in Firejail sandbox, otherwise you end up with a new window running outside the sandbox. Chromium has the same problem, and quite a number of other programs, most notably file managers. I'll close the bug for now, we can always reopen it if necessary.

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Reference: github-starred/firejail#39

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