Bug 301098 – [GTK][WPE] bwrapinfo.json file leaks

• Status: NEW
• Component: New Bugs

[Carlos Alberto Lopez Perez]

Each time the browser is started it is leaking bwrapinfo.json files at ${XDG_RUNTIME_DIR}/.flatpak/webkit-${PID}-${ID}

And this can be an issue that can cause ${XDG_RUNTIME_DIR} to become full

This is causing issues for example, on the RPi4 boards running the WPE performance bot CI. 
See:

https://build.webkit.org/#/builders/895/builds/20515
** (MiniBrowser:3724721): WARNING **: 07:59:25.587: Failed to create '/run/user/1906/.flatpak/webkit-3724721-4': No space left on device
** (MiniBrowser:3724721): WARNING **: 07:59:25.587: Failed to make socket file /run/user/1906/wpe/bus-proxy-4BU1E3 for dbus proxy: No space left on device
** (MiniBrowser:3724721): WARNING **: 07:59:25.588: Failed to make socket file /run/user/1906/wpe/a11y-proxy-S0T1E3 for dbus proxy: No space left on device
** (WPEWebProcess:2): WARNING **: 07:59:26.014: Can't connect to a11y bus: Could not connect: No such file or directory
** (MiniBrowser:3724721): WARNING **: 07:59:26.043: Failed to create '/run/user/1906/.flatpak/webkit-3724721-5': No space left on device


A manual inspect via ssh shows thousands of this files that end adding and consuming all the space available there (380M)

bb-wpe-rpi4-perf6-64 ~ # du -hs /run/user/1906/.flatpak
189M	/run/user/1906/.flatpak

bb-wpe-rpi4-perf6-64 ~ # df -h /run/user/1906/.flatpak
Filesystem      Size  Used Avail Use% Mounted on
tmpfs           380M  189M  191M  50% /run/user/1906

bb-wpe-rpi4-perf6-64 ~ # find /run/user/1906/.flatpak -type f -name bwrapinfo.json|wc -l
48162

[Carlos Alberto Lopez Perez]

273334@main added the code to create this bwrapinfo.json files

[Patrick Griffis]

It looks like Flatpak has a lot of logic to deal with this: https://github.com/flatpak/flatpak/blob/main/common/flatpak-instance.c

It involves locking the file at various points, and a garbage collection step.