runtime: unexpected return pc crash on linux-amd64-alpine builder #54306
The revived linux-amd64-alpine builder has flaked twice in its short new lifetime with 'unexpected return pc' crashes during the cgo tests.
Here is a repro case using a gomote (note that if you ssh in, you have to set up your environment manually, and in particular you have to put /workdir/go/bin at the front of PATH and have to set GOROOT_BOOTSTRAP=/workdir/go1.4). Not sure why the environment is so messed up on Alpine. gomote run does not have these problems, only gomote ssh.
You may need to repeat the try.sh a few times depending on how flaky the machine is feeling but most runs get at least one failure.
Here are some failures from that script:
This one did not happen during garbage collection:
Here are the two build dashboard failures:
Perhaps this is Alpine-specific, or perhaps it is musl-related.
There are a few other open 'unexpected return pc' issues.
#35005 is the most interesting one but the repro case is a very large program running under Docker.
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