[Bug 1905651] Re: Tests cannot call g_error

[Thomas Huth]

The QEMU project is currently moving its bug tracking to another system.
For this we need to know which bugs are still valid and which could be
closed already. Thus we are setting the bug state to "Incomplete" now.

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Thank you and sorry for the inconvenience.


** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1905651

Title:
  Tests cannot call g_error

Status in QEMU:
  Incomplete

Bug description:
  I stumbled on this writing a new test, using tests/qtest/e1000e-test.c
  as a template.

  g_error() causes SIGTRAP, not SIGABRT, and thus the abort handler doesn't get 
run.
  This in turn means qemu is not killed, which hangs the test because the 
tap-driver.pl script hangs waiting for more input.
  There are a few tests that call g_error().

  The SIGABRT handler explicitly kills qemu, e.g.:

  qos-test.c:
      qtest_add_abrt_handler(kill_qemu_hook_func, s);

  ref:
  
https://git.qemu.org/?p=qemu.git;a=blob;f=tests/qtest/libqtest.c;h=e49f3a1e45f4cd96279241fdb2bbe231029ab922;hb=HEAD#l272

  But not unexpectedly there's no such handler for SIGTRAP.

  Apply this patch to trigger a repro:

  diff --git a/tests/qtest/e1000e-test.c b/tests/qtest/e1000e-test.c
  index fc226fdfeb..e83ace1b5c 100644
  --- a/tests/qtest/e1000e-test.c
  +++ b/tests/qtest/e1000e-test.c
  @@ -87,6 +87,9 @@ static void e1000e_send_verify(QE1000E *d, int 
*test_sockets, QGuestAllocator *a
       /* Wait for TX WB interrupt */
       e1000e_wait_isr(d, E1000E_TX0_MSG_ID);

  +    g_message("Test g_error hang ...");
  +    g_error("Pretend something timed out");
  +
       /* Check DD bit */
       g_assert_cmphex(le32_to_cpu(descr.upper.data) & dsta_dd, ==, dsta_dd);

  Then:

  configure
  make
  make check-qtest-i386

  check-qtest-i386 will take awhile. To repro faster:

  $ grep qtest-i386/qos-test Makefile.mtest
  .test.name.229 := qtest-i386/qos-test
  $ make run-test-229
  Running test qtest-i386/qos-test
  ** Message: 18:40:49.821: Test g_error hang ...

  ** (tests/qtest/qos-test:3820728): ERROR **: 18:40:49.821: Pretend something 
timed out
  ERROR qtest-i386/qos-test - Bail out! FATAL-ERROR: Pretend something timed out

  At this point things are hung because tap-driver.pl is still waiting
  for input because qemu is still running.

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