Crash on start Ubuntu 26.04, libQt5WebEngineCore triggers kernel trap [FIXED]

Bugs and issues
1

Running insync start and monitoring journald gives this relevant line before crashing:

kernel: traps: insync[91187] trap int3 ip:7dfa745f56f1 sp:7ffdff961f60 error:0 in libQt5WebEngineCore.so.5[35f56f1,7dfa71000000+74ea000]

Problem began surfacing after 23 Sept 2026. It seems other WebKit related software are also malfunctioning. E.g. Evolution now refuses to render emails (it uses libwebkit2gtk).

2

My apologies for the trouble! Could you please do the following:

  • run insync start --no-daemon
  • email the full output to support@insynchq.com, including the link to this Forums post
  • include your logs.db and out.txt files, which are located in ~/.config/Insync

Thank you!

3

Following a comment in a similar bug reported here ( Crash on Kubuntu 26.04 - #3 by Russell_Stewart ) I’ve tried running fc-cache -fv, first run failed and second succeeded, after which Insync started working again.

I have no idea what caused the font cache to corrupt (I don’t know if it’s Chrome like the other user) and why it only targeted WebKit/WebEngine stuff. But I’m happy the issue is resolved.

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4

Hi @routing6581! Thank you for updating that the second run succeeded. :slight_smile:

5

Good morning.

This issue occurred across three machines running Zorin 18.1 Pro. I can confirm that fc-cache -fv did resolve the issue on all three, and the fc-cache command successfully ran on the first attempt.

Thank you so much for your insight on this one. Our initial diagnosis was taking us in a very different direction.

Appreciated.

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