Fedora
qemu package

  1. Bug #1921664
  2. Comment #28

Comment 28 for bug 1921664

Revision history for this message
Christian Ehrhardt  (paelzer) wrote : Re: Coroutines are racy for risc64 emu on arm64 - crash on Assertion

Hmm, thanks for the hint Thomas.

Of the two formerly referenced same-source different result builds:

[1] => built 2021-03-23 in Hirsute => works
[2] => built 2021-04-12 in Hirsute => fails

[1]: https://launchpad.net/ubuntu/+source/qemu/1:5.2+dfsg-9ubuntu1/+build/21196422
[2]: https://launchpad.net/~paelzer/+archive/ubuntu/lp-1921664-testbuilds-rebuildold/+build/21392458

The default flags changed in
  https://launchpad.net/ubuntu/+source/dpkg/1.20.7.1ubuntu4
and according to the build logs both ran with that.
Copy-Pasta from the log:
  dpkg (= 1.20.7.1ubuntu4),
=> In between those we did not switch the LTO default flags

For clarification LTO is the default nowadays and we are not disabling it generally in qemu. So - yes the builds are with LTO, but both the good and the bad one are.

Although looking at versions I see we have:
- good case 10.2.1-23ubuntu2
- bad case 10.3.0-1ubuntu1

So maybe - while it wasn't LTO - something in 10.3 maybe even LTO-since-10.3 is what is broken?

@Tommy - I don't have any of the test systems around anymore, if I'd build you a no-LTO qemu for testing what would you these days need - Hirsute, Impish, ... ?