| commit | f274eb47c6f76e205a8b3e6df2a18e943b99f454 | [log] [tgz] |
|---|---|---|
| author | Jan Stancek <jstancek@redhat.com> | Fri Feb 21 16:50:13 2020 +0100 |
| committer | Jan Stancek <jstancek@redhat.com> | Tue Feb 25 09:36:18 2020 +0100 |
| tree | 468f0b1abf460a2737f61e0c709f4c77cf0b03ae | |
| parent | 81b38183f1c668959d6325bd6c0e11eac5edd123 [diff] |
lib: fputs() in print_result() is not signal safe
We have tests that use tst_res() from signal handler and current
implementation leads to rare hangs if signal arrives in bad time:
main
tst_run_tcases
fork_testrun
testrun
run_tests
run
tst_res_ -> TINFO from main process
tst_vres_
print_result
fputs
__lll_lock_wait_private
<signal handler called>
tst_res_ -> TINFO from signal handler
tst_vres_
print_result
fputs
__lll_lock_wait_private -> HANGS
One example is timer_settime01, where we have TPASS from main process
and TINFO as response to SIGALRM. SIGALRM happening immediately on older
kernels might be a bug, but that is beside the point of this patch.
Replace fputs() with write() to avoid this hang.
Signed-off-by: Jan Stancek <jstancek@redhat.com>
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Linux Test Project is a joint project started by SGI, OSDL and Bull developed and maintained by IBM, Cisco, Fujitsu, SUSE, Red Hat, Oracle and others. The project goal is to deliver tests to the open source community that validate the reliability, robustness, and stability of Linux.
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Don't run them on production systems. Growfiles, doio, and iogen in particular stress the I/O capabilities of systems and while they should not cause problems on properly functioning systems, they are intended to find (or cause) problems.
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doc/mini-howto-building-ltp-from-git.txt.INSTALL and ./configure --help.Some tests will be disabled if the configure script can not find their build dependencies.
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