[Bug 278293] www/qt6-webengine and www/chromium: both fail to build on stable/14 with similar error when poudriere has USE_TMPFS=all set

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278293

Sam May <ag at eitilt.life> changed:

           What    |Removed                     |Added
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                 CC|                            |ag at eitilt.life

--- Comment #11 from Sam May <ag at eitilt.life> ---
This is definitely something to do with Poudriere's specific builder jail setup
in our configs.  I have the same failure when building with the usual commands,
however when I ask poudriere to keep the jail around ("-I") in order to collect
the ktrace requested, the snapshot generator actually succeeds on the manual
invocation.  That makes reproduction rather difficult...

Since my combination of hardware/ccache/etc. lets me get back to the failure in
~15m (~30m if I have it save the wrkdir) rather than Marek's several hours, I'm
in a better spot to iterate on the problem.  I can confirm that USE_TMPFS=no
per the title and comment #4 doesn't resolve things, and will keep poking
around to see what I can turn up -- next step is to try to hack into the
Poudriere scripts themselves to cause a dirty shutdown on failure to have the
/same/ jail environment to work from rather than the doctored form -I and -i
provide.

Side note: Bug #256411 seems to be a previous iteration of this bug, and
further evidence that it's somehow transient even for the same person. 
Hopefully I get some concrete progress before it mysteriously clears up for me
as well.

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