Public bug reported:
[Impact]
* Builds and autpkgtests frequently fail due to failing tst-getrandom
probably due to insufficient source of entropy on Launchpad. This causes
extra work by requiring retriggering failing builds and autopkgtests.
[Test Case]
* Observe tst-getrandom tests being marked XFAIL in build logs.
[Regression Potential]
* The fix does not change run-time behaviour of glibc, just ignores a
test. This lets potential breakages in getrandom()'s implementation or
in kernel's random source being undetected, but the test results can
still be observed in the logs if needed and the random implementation is
also most likely exercised in other tests, too.
[Other Info]
The issue can be reproduced locally in a built glibc package tree
without haveged or any other good entropy source installed:
rbalint@gaia:~/projects/deb/build-area/glibc-2.31$ for i in $(seq 1000); do
./build-tree/amd64-libc/stdlib/tst-getrandom; done
Timed out: killed the child process
Termination time: 2020-08-12T21:05:28.234517252
Last write to standard output: 2020-08-12T21:05:04.069616637
Timed out: killed the child process
Termination time: 2020-08-12T21:05:48.337084141
Last write to standard output: 2020-08-12T21:05:28.069616637
Timed out: killed the child process
Termination time: 2020-08-12T21:06:08.439695563
Last write to standard output: 2020-08-12T21:05:48.069616637
Timed out: killed the child process
Termination time: 2020-08-12T21:06:28.542962616
Last write to standard output: 2020-08-12T21:06:08.069616637
Timed out: killed the child process
...
With haveged installed the tests pass quickly and without error:
rbalint@gaia:~/projects/deb/build-area/glibc-2.31$ for i in $(seq 1000); do
./build-tree/amd64-libc/stdlib/tst-getrandom; done
rbalint@gaia:~/projects/deb/build-area/glibc-2.31$
An other way of fixing the issue would be installing better entropy
sources in the build and autopkgtest infrastructure.
** Affects: auto-package-testing
Importance: Undecided
Status: New
** Affects: glibc (Ubuntu)
Importance: Undecided
Status: New
** Also affects: auto-package-testing
Importance: Undecided
Status: New
** Description changed:
[Impact]
- * Builds and autpkgtests frequently fail due to failing tst-getrandom
+ * Builds and autpkgtests frequently fail due to failing tst-getrandom
probably due to insufficient source of entropy on Launchpad. This causes
extra work by requiring retriggering failing builds and autopkgtests.
[Test Case]
* Observe tst-getrandom tests being marked XFAIL in build logs.
[Regression Potential]
* The fix does not change run-time behaviour of glibc, just ignores a
test. This lets potential breakages in getrandom()'s implementation or
in kernel's random source being undetected, but the test results can
still be observed in the logs if needed and the random implementation is
also most likely exercised in other tests, too.
[Other Info]
The issue can be reproduced locally in a built glibc package tree
without haveged or any other good entropy source installed:
rbalint@gaia:~/projects/deb/build-area/glibc-2.31$ for i in $(seq 1000); do
./build-tree/amd64-libc/stdlib/tst-getrandom; done
Timed out: killed the child process
Termination time: 2020-08-12T21:05:28.234517252
Last write to standard output: 2020-08-12T21:05:04.069616637
Timed out: killed the child process
Termination time: 2020-08-12T21:05:48.337084141
Last write to standard output: 2020-08-12T21:05:28.069616637
Timed out: killed the child process
Termination time: 2020-08-12T21:06:08.439695563
Last write to standard output: 2020-08-12T21:05:48.069616637
Timed out: killed the child process
Termination time: 2020-08-12T21:06:28.542962616
Last write to standard output: 2020-08-12T21:06:08.069616637
Timed out: killed the child process
...
With haveged installed the tests pass quickly and without error:
rbalint@gaia:~/projects/deb/build-area/glibc-2.31$ for i in $(seq 1000); do
./build-tree/amd64-libc/stdlib/tst-getrandom; done
rbalint@gaia:~/projects/deb/build-area/glibc-2.31$
+
+ An other way of fixing the issue would be installing better entropy
+ sources in the build and autopkgtest infrastructure.
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https://bugs.launchpad.net/bugs/1891403
Title:
glibc tests needs more entropy causing tst-getrandom failures
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