Bug#1127735: haskell-conduit-extra: FTBFS: autobuilder hangs (randomly)

[Santiago Vila]

Package: src:haskell-conduit-extra
Version: 1.3.8-1
Severity: important
Tags: ftbfs forky sid

Dear maintainer:

During a rebuild of all packages in unstable, this package failed to build.

Below you will find the last part of the build log (probably the most
relevant part, but not necessarily). If required, the full build log
is available here:

https://people.debian.org/~sanvila/build-logs/202602/

Notes:

- Normal build time for this package is around two minutes at most.

- Message "Build killed with signal TERM" is from sbuild, who
detects the build is in stalled state, and aborts the build.

- The failure happens randomly. After some tests, it happened
to me around 10% of the time on machines with 1 CPU and never on
machines with 2 CPUs (after trying 25 times in each case).

- However, it also failed here at least once:

https://buildd.debian.org/status/fetch.php?pkg=haskell-conduit-extra&arch=s390x&ver=1.3.8-1&stamp=1770875697&raw=0

which means:

a) this is not s390x-specific, as it also happened to me on amd64.

b) this is not specific to single-cpu systems, as it also happened
on the s390x autobuilder, which has 2 CPUs.

If you can identify the test which is triggering this, my suggestion
would be to disable it, as it's flaky.


About the archive rebuild: The build was made on virtual machines from AWS,
using sbuild and a reduced chroot with only build-essential packages.

If you cannot reproduce the bug please contact me privately, as I
am willing to provide ssh access to a virtual machine where the bug is
fully reproducible (note: not really in this case because it's random,
but it would be correct to say that I can offer a VM where such
randomness happens).

If this is really a bug in one of the build-depends, please use
reassign and add an affects on src:haskell-conduit-extra, so that this is still
visible in the BTS web page for this package.

Thanks.

--------------------------------------------------------------------------------
[...]
Data.Conduit.Process
  Data.Conduit.Process
    cat [✔]
      +++ OK, passed 100 tests.
    closed stream [✔]
    handles sub-process exit code [✔]
    consumes stdout [✔]
    consumes stderr [✔]
    feeds stdin [✔]
    gracefully handles closed stdin [✔]
    blocking vs non-blocking [✔]
Data.Conduit.Process.Typed
  cat works [✔]
  cat works with withLoggedProcess_ [✔]
  failing process throws [✔]
cat: 'does not exist': No such file or directory
E: Build killed with signal TERM after 60 minutes of inactivity
--------------------------------------------------------------------------------