debcrafters-packages team mailing list archive

[Nick Rosbrook <2114514@xxxxxxxxxxxxxxxxxx>]

The immediate cause of the segfault is that in
test_trace_library_read(), we have:

...

        handle = tracecmd_open(TRACECMD_FILE, 0);
        CU_TEST(handle != NULL);
        ret = tracecmd_iterate_events(handle, NULL, 0, read_events, &data);
        CU_TEST(ret == 0);

...

and tracecmd_open() returns NULL. But, CU_TEST() failing is not fatal,
so the tracecmd_iterate_events() call still happens.

However, *why* tracecmd_open() fails (and returns NULL) on s390x only is
not clear. I found *where* it's failing, which is in handle_section():

...

        section->data_offset = lseek(handle->fd, 0, SEEK_CUR);
        if ((section->flags & TRACECMD_SEC_FL_COMPRESS) && in_uncompress_block(handle))
                return -1;

...

Adding --compression none to the relevant trace-cmd invocations does
mask the issue.

-- 
You received this bug notification because you are a member of
Debcrafters packages, which is subscribed to trace-cmd in Ubuntu.
https://bugs.launchpad.net/bugs/2114514

Title:
  trace-cmd: autopkgtest fails on s390x with seg fault

Status in trace-cmd package in Ubuntu:
  Confirmed

Bug description:
  On s390x, the trace-utest is reliably failing with:

  386s ++ pkg-config --cflags --libs libtracecmd
  386s + cc -o utest/trace-utest utest/trace-utest.c utest/tracecmd-utest.c -I/usr/include/trace-cmd -I/usr/include/tracefs -I/usr/include/traceevent -ltracecmd -ltracefs -ltraceevent -lcunit
  388s 
  388s 
  388s      CUnit - A unit testing framework for C - Version 2.1-3
  388s      http://cunit.sourceforge.net/
  388s 
  388s 
  388s Suite: trace-cmd
  388s   Test: Simple record and report ...+ ./utest/trace-utest
  388s In tree trace-cmd executable not found
  435s FAILED
  435s     1. utest/tracecmd-utest.c:337  - ret == 0
  462s   Test: Create a histogram ...passed
  462s   Test: Test convert from v7 to v6 ...passed
  463s   Test: Use libraries to read file .../tmp/autopkgtest.Glw2oK/build.fQe/src/debian/tests/trace-utest: line 19:  3091 Segmentation fault      (core dumped) ./utest/trace-utest
  464s autopkgtest [17:42:38]: test trace-utest: -----------------------]
  464s autopkgtest [17:42:38]: test trace-utest:  - - - - - - - - - - results - - - - - - - - - -
  464s trace-utest          FAIL non-zero exit status 139

  See
  https://objectstorage.prodstack5.canonical.com/swift/v1/AUTH_0f9aae918d5b4744bf7b827671c86842/autopkgtest-
  questing/questing/s390x/t/trace-cmd/20250612_174750_59fc2@/log.gz for
  a full log.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/trace-cmd/+bug/2114514/+subscriptions