* bug#48941: [powerpc64le-linux] libfaketime CLOCK_MONOTONIC test hangs
@ 2021-06-10 4:21 Chris Marusich
2021-06-12 2:56 ` Chris Marusich
0 siblings, 1 reply; 2+ messages in thread
From: Chris Marusich @ 2021-06-10 4:21 UTC (permalink / raw)
To: 48941
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Hi,
On powerpc64le-linux, using Guix commit
7692295f970a292a3f3db31fc21d05efd97dcb25 on top of Debian unstable, the
libfaketime package fails to build because one of its tests hangs. It
appears to hang during the CLOCK_MONOTONIC test:
--8<---------------cut here---------------start------------->8---
Running the test program with no faked time specified
$ LD_PRELOAD=../src/libfaketime.so.1 ./timetest
pthread_cond_timedwait: CLOCK_REALTIME test
(Intentionally sleeping 1 second...)
pthread_cond_timedwait: CLOCK_MONOTONIC test
(Intentionally sleeping 1 second..., see docs about CLOCK_MONOTONIC test)
--8<---------------cut here---------------end--------------->8---
There is no output after that last line. It just sits there. I left it
there for about 24 hours, and it didn't make any progress. I tried with
--cores=1, too, but the problem still occurred. Therefore, it probably
isn't a multithreading issue.
On x86_64-linux Guix, using the aforementioned commit, on top of Fedora
32, the tests pass and the libfaketime builds successfully. Therefore,
this is probably a platform-specific issue.
The README file for libfaketime says:
> CLOCK_MONOTONIC test: Running "make test" performs a series of tests
> after successful compilation of the libfaketime library. On some
> platforms, the "CLOCK_MONOTONIC test" will apparently hang
> forever. If and only if this happens on your platform, add the CFLAG
> -DFORCE_MONOTONIC_FIX to src/Makefile and recompile libfaketime. Do
> not set FORCE_MONOTONIC_FIX on platforms where the test does not
> hang.
In fact, we do set this in Guix, via the (apparently undocumented)
FAKETIME_COMPILE_CFLAGS environment variable:
--8<---------------cut here---------------start------------->8---
(define-public libfaketime
(package
(name "libfaketime")
...
(arguments
'(#:phases (modify-phases %standard-phases
(replace 'configure
(lambda* (#:key outputs #:allow-other-keys)
(let ((out (assoc-ref outputs "out")))
(setenv "CC" "gcc")
(setenv "PREFIX" out)
;; XXX: Without this flag, the CLOCK_REALTIME test hangs
;; indefinitely. See README.packagers for more information.
;; Try removing this for future versions of libfaketime.
(setenv "FAKETIME_COMPILE_CFLAGS" "-DFORCE_MONOTONIC_FIX")
...
--8<---------------cut here---------------end--------------->8---
In spite of this, the test hangs on powerpc64le-linux. Out of
curiosity, I tried NOT setting FAKETIME_COMPILE_CFLAGS, but the behavior
was the same: it still got stuck forever on powerpc64le-linux.
--
Chris
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2021-06-10 4:21 bug#48941: [powerpc64le-linux] libfaketime CLOCK_MONOTONIC test hangs Chris Marusich
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