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Description of problem: In our Cockpit tests on RHEL/CentOS 8, the (Python) bridge often triggers this assertion in libsystemd when using the inotify API.


Version-Release number of selected component (if applicable):

systemd-239-76.el8.x86_64.rpm


How reproducible: Always


Steps to Reproduce:

We often see this in Cockpit's integration tests, e.g. in [1], with a full journal [2]. But this can be reproduced/investigated in a more accessible way with our systemd_ctypes library:

  git clone https://github.com/allisonkarlitskaya/systemd_ctypes
  # disable the test skip
  sed -i '/crashes on RHEL 8 systemd/d' systemd_ctypes/test/test_pathwatch.py

  podman run -it --rm -v ./systemd_ctypes:/src -w /src quay.io/centos/centos:stream8

Inside the container:

  dnf install -y python3-pip python3-dbus dbus-daemon systemd-libs; pip3 install tox
  tox -e py3 -- -sv -k testRootDirectoryIdentity

Actual results:

crashes with

  Assertion 'sz <= d->buffer_filled' failed at ../src/libsystemd/sd-event/sd-event.c:3229, function event_inotify_data_drop(). Aborting.


Expected results: Works, like on RHEL 9 and Fedora.


Additional info:

[1] https://cockpit-logs.us-east-1.linodeobjects.com/pull-18860-20230531-072427-a3d937fe-centos-8-stream-pybridge/log.html#264
[2] https://cockpit-logs.us-east-1.linodeobjects.com/pull-18860-20230531-072427-a3d937fe-centos-8-stream-pybridge/TestIPA-testClientCertAuthentication-centos-8-stream-127.0.0.2-2501-FAIL.log.gz

>  # disable the test skip
>  sed -i '/crashes on RHEL 8 systemd/d' test/test_pathwatch.py

Sorry, of course that needs to happen in the checkout dir:

  sed -i '/crashes on RHEL 8 systemd/d' systemd_ctypes/test/test_pathwatch.py

fix merged to github main branch -> https://github.com/redhat-plumbers/systemd-rhel8/pull/396

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (systemd bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:7097