sorear[m] changed the topic of #riscv to: Matrix users: #riscv:libera.chat will be ending operation NET Jul 25; please test #riscv:catircservices.org as a replacement | RISC-V instruction set architecture | https://riscv.org | Logs: https://libera.irclog.whitequark.org/riscv
<muurkha>
I'm amused at the decision to make a fresh (in-RAM) copy of the qemu executable on every invocation in order to, I guess, avoid depending on a separate qemu executable in the filesystem?
<courmisch>
does it make a copy, or just a mapping though?
<sorear>
write() looks like a copy
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<dh`>
that's... creative
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<unlord>
muurkha: yes correct
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<unlord>
there was no configuration in binfmt_misc since I put this binary in the default location as configured by the host in /proc/sys/fs/binfmt_misc/qemu-riscv64 interpreter
<unlord>
where does the environment variable in .bashrc live?
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<aurel32>
alexghiti: not sure I am encountered that failure, but something that is similar
<aurel32>
i am trying to see if i can reproduce the issue, it's very rare
<aurel32>
at least the symptoms are exactly the same
<aurel32>
it appeared after upgrading from kernel 6.3.7 to kernel 6.4.4, but this could be a statistical outlier and totally unrelated
<aurel32>
and i have the feeling it's even more rare than 3 years ago
<alexghiti>
And it still happens on QEMU right?
<davidlt>
I never had these issues before until ~Fedora 38 time frame.
<alexghiti>
What kernel version is in Fedora 38?
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<davidlt>
v6.4.7 right now
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<aurel32>
and was what the one used before the issue appeared?
<davidlt>
But that's recent, not too many builds on that one.
<davidlt>
Hard to tell right now. I would need to pull logs for X months and do some large bash oneliner to figure it out.
<alexghiti>
And does it happen on qemu? That's important to me as I'm chasing TLB issues on real hardware, that would give some hint :)
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<aurel32>
alexghiti: we are not using QEMU since we got enough Unmatched hardware, so it's difficult to tell
<davidlt>
In Fedora we no longer use QEMU for builders, thus I don't know.
<aurel32>
so same ;-)
<aurel32>
we are going to rollback the buildd having issues to 6.3.7 and see if the issue happens again. But it will likely take a few days to provide an answer here given the issue is rare
<alexghiti>
xypron Did you notice any random build failures like the ones aurel32 and davidlt see?
<xypron>
alexghiti: I have not seen such problems yet.
<aurel32>
xypron: which kernel version do you use?
<aurel32>
alexghiti: the TLB issue you are chasing appeared with kernel 6.4?
<xypron>
alexghiti: 6.2.0-24-generic #24.1-Ubuntu
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<Esmil>
alexghiti: i'm runnincg 6.5-rc3/4 on some of my boards, but haven't seen this issue
<alexghiti>
I'm debugging 6.4.7 yes, but admittedly I'm not sure this is even related. Esmil I can't reproduce the issue I'm debugging on 6.5
<Esmil>
ah ok
<aurel32>
could it be something that is something that is linked with kernel randomization, and thus that you can get or not depending on the luck you have when booting the kernel until you reboot it again?
<alexghiti>
The random offset you disabled is chosen at every fork, that's not KASLR related as we don't have it yet
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<jrtc27>
perhaps MIN_GAP of 128M is too small for GCC?
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<jrtc27>
hm seems not, printed badaddr (tval) isn't close to sp
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