[powerpc64le-linux] libfaketime CLOCK_MONOTONIC test hangs

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3 participants

Thiago Jung Bauermann
Chris Marusich
Kaelyn

Owner: unassigned

Submitted by: Chris Marusich

Severity: normal

Chris Marusich wrote on 10 Jun 2021 06:21

Recipients:(address . bug-guix@gnu.org)

Message-ID:871r9atkne.fsf@gmail.com

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:

Toggle snippet (8 lines)

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)

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:

Toggle quote (8 lines)

> 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:

Toggle snippet (19 lines)(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")
    ...

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

Chris Marusich wrote on 12 Jun 2021 04:56

Recipients:(address . 48941@debbugs.gnu.org)

Message-ID:87wnqzssdz.fsf@gmail.com

Hi,

Since I'm not sure how to proceed, I've reported this upstream and asked

for help:

https://github.com/wolfcw/libfaketime/issues/335

Chris

Chris Marusich wrote on 21 Jul 2021 07:08

Recipients:(address . 48941@debbugs.gnu.org)(address . guix-devel@gnu.org)

Message-ID:874kco8d9s.fsf@gmail.com

Hi,

I need a little help figuring out how to use gdb in Guix for bug 48941:

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=48941

Here's the situation. A libfaketime test hangs forever. Upstream

suggested I debug it. I'm trying to, but gdb errors out. What am I

doing wrong? It's probably something simple, but I can't see what.

I'll describe what I've done. First, I started a build like so:

./pre-inst-env guix build --keep-failed libfaketime

While the problematic test hung, I found the PID of the test and killed

it. This caused the build to fail, leaving the build environment for me

to play around in.

I entered a pure environment that contains all the things I need to

debug the test (gcc 10.3.0 is currently the default gcc on

core-updates):

./pre-inst-env guix environment --pure libfaketime --ad-hoc gcc-toolchain@10.3.0 gcc-toolchain@10.3.0:debug gdb

In the pure environment, I confirmed I can build and run the hanging

test via the following commands (I added -g in order to get debug

symbols):

make FAKETIME_COMPILE_CFLAGS='-DFORCE_MONOTONIC_FIX -g' CC=gcc PREFIX=/tmp/guix-build-libfaketime-0.9.9.drv-0/myprefix

make FAKETIME_COMPILE_CFLAGS='-DFORCE_MONOTONIC_FIX -g' CC=gcc PREFIX=/tmp/guix-build-libfaketime-0.9.9.drv-0/myprefix test

OK, so I can trigger the hang. Great! Next step, fire up GDB:

Toggle snippet (21 lines)[0] [env] marusich@suzaku:/tmp/guix-build-libfaketime-0.9.9.drv-0/source/test
$ gdb ./timetest
GNU gdb (GDB) 10.2
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "powerpc64le-unknown-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./timetest...
(gdb) 

The debug symbols provided by gcc-toolchain@10.3.0:debug are under

$GUIX_ENVIRONMENT/lib/debug. This is the value of GUIX_ENVIRONMENT:

Toggle snippet (4 lines)

$ echo $GUIX_ENVIRONMENT

/gnu/store/32fjhp30k34fh0g9f1gmgcj8pc5wldq6-profile

By the way, this directory corresponds to glibc 2.33:

Toggle snippet (4 lines)

$ realpath /gnu/store/32fjhp30k34fh0g9f1gmgcj8pc5wldq6-profile/lib/debug

/gnu/store/8akrlhc25d7xvi85gzvginw0vdi4zyg4-glibc-2.33-debug/lib/debug

Let's tell GDB where to find those debug symbols:

(gdb) set debug-file-directory /gnu/store/32fjhp30k34fh0g9f1gmgcj8pc5wldq6-profile/lib/debug

Let's also tell GDB to set the environment variables that upstream

recommended when running the test program:

Toggle snippet (5 lines)

(gdb) set environment LD_PRELOAD=../src/libfaketime.so.1

(gdb) set environment FAKETIME=-10d

(gdb) set environment NO_FAKE_STAT=1

Now run it:

Toggle snippet (10 lines)

(gdb) run

Starting program: /tmp/guix-build-libfaketime-0.9.9.drv-0/source/test/timetest

/bin/sh: /lib/powerpc64le-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by ../src/libfaketime.so.1)

/bin/sh: /lib/powerpc64le-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by /gnu/store/kmblbljiygayhlc5gb02an9imhy90ws9-glibc-2.33/lib/libpthread.so.0)

/bin/sh: /lib/powerpc64le-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by /gnu/store/kmblbljiygayhlc5gb02an9imhy90ws9-glibc-2.33/lib/libdl.so.2)

/bin/sh: /lib/powerpc64le-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by /gnu/store/kmblbljiygayhlc5gb02an9imhy90ws9-glibc-2.33/lib/librt.so.1)

During startup program exited with code 1.

(gdb)

Huh? What happened? I've double checked that I'm using gdb provided by

Guix:

Toggle snippet (4 lines)

$ type -P gdb

/gnu/store/32fjhp30k34fh0g9f1gmgcj8pc5wldq6-profile/bin/gdb

I also tried running gdb by invoking it via that absolute file name, and

it still errored out in the same way.

I'm operating in a --pure environment. All the tools are provided by

Guix. I'm surprised that /bin/sh and /lib are even mentioned above.

If anyone can provide any advice, I'd be very grateful. I'm not sure

how to proceed.

Chris

Kaelyn wrote on 21 Jul 2021 16:31

Recipients:(name . Chris Marusich)(address . cmmarusich@gmail.com)

Message-ID:GijrfHfxGeVNJVWlkkOpscqh2dekCZhqP6OG4ihBNoSCZlxk0evgqhgCT4WEpHdpRsEk_tBHC0rsTHHgl20vhEBt8UJHnsNNglj5-SF4JrI=@protonmail.com

Hi,

??????? Original Message ???????

On Wednesday, July 21st, 2021 at 1:08 AM, Chris Marusich <cmmarusich@gmail.com> wrote:

Toggle quote (132 lines)> Hi,
>
> I need a little help figuring out how to use gdb in Guix for bug 48941:
>
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=48941
>
> Here's the situation. A libfaketime test hangs forever. Upstream
>
> suggested I debug it. I'm trying to, but gdb errors out. What am I
>
> doing wrong? It's probably something simple, but I can't see what.
>
> I'll describe what I've done. First, I started a build like so:
>
> ./pre-inst-env guix build --keep-failed libfaketime
>
> While the problematic test hung, I found the PID of the test and killed
>
> it. This caused the build to fail, leaving the build environment for me
>
> to play around in.
>
> I entered a pure environment that contains all the things I need to
>
> debug the test (gcc 10.3.0 is currently the default gcc on
>
> core-updates):
>
> ./pre-inst-env guix environment --pure libfaketime --ad-hoc gcc-toolchain@10.3.0 gcc-toolchain@10.3.0:debug gdb
>
> In the pure environment, I confirmed I can build and run the hanging
>
> test via the following commands (I added -g in order to get debug
>
> symbols):
>
> make FAKETIME_COMPILE_CFLAGS='-DFORCE_MONOTONIC_FIX -g' CC=gcc PREFIX=/tmp/guix-build-libfaketime-0.9.9.drv-0/myprefix
>
> make FAKETIME_COMPILE_CFLAGS='-DFORCE_MONOTONIC_FIX -g' CC=gcc PREFIX=/tmp/guix-build-libfaketime-0.9.9.drv-0/myprefix test
>
> OK, so I can trigger the hang. Great! Next step, fire up GDB:
>
> --8<---------------cut here---------------start------------->8---
>
> [0] [env] marusich@suzaku:/tmp/guix-build-libfaketime-0.9.9.drv-0/source/test
>
> $ gdb ./timetest
>
> GNU gdb (GDB) 10.2
>
> Copyright (C) 2021 Free Software Foundation, Inc.
>
> License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html
>
> This is free software: you are free to change and redistribute it.
>
> There is NO WARRANTY, to the extent permitted by law.
>
> Type "show copying" and "show warranty" for details.
>
> This GDB was configured as "powerpc64le-unknown-linux-gnu".
>
> Type "show configuration" for configuration details.
>
> For bug reporting instructions, please see:
>
> https://www.gnu.org/software/gdb/bugs/.
>
> Find the GDB manual and other documentation resources online at:
>
> http://www.gnu.org/software/gdb/documentation/.
>
> For help, type "help".
>
> Type "apropos word" to search for commands related to "word"...
>
> Reading symbols from ./timetest...
>
> (gdb)
>
> --8<---------------cut here---------------end--------------->8---
>
> The debug symbols provided by gcc-toolchain@10.3.0:debug are under
>
> $GUIX_ENVIRONMENT/lib/debug. This is the value of GUIX_ENVIRONMENT:
>
> --8<---------------cut here---------------start------------->8---
>
> $ echo $GUIX_ENVIRONMENT
>
> /gnu/store/32fjhp30k34fh0g9f1gmgcj8pc5wldq6-profile
>
> --8<---------------cut here---------------end--------------->8---
>
> By the way, this directory corresponds to glibc 2.33:
>
> --8<---------------cut here---------------start------------->8---
>
> $ realpath /gnu/store/32fjhp30k34fh0g9f1gmgcj8pc5wldq6-profile/lib/debug
>
> /gnu/store/8akrlhc25d7xvi85gzvginw0vdi4zyg4-glibc-2.33-debug/lib/debug
>
> --8<---------------cut here---------------end--------------->8---
>
> Let's tell GDB where to find those debug symbols:
>
> (gdb) set debug-file-directory /gnu/store/32fjhp30k34fh0g9f1gmgcj8pc5wldq6-profile/lib/debug
>
> Let's also tell GDB to set the environment variables that upstream
>
> recommended when running the test program:
>
> --8<---------------cut here---------------start------------->8---
>
> (gdb) set environment LD_PRELOAD=../src/libfaketime.so.1
>
> (gdb) set environment FAKETIME=-10d
>
> (gdb) set environment NO_FAKE_STAT=1
>
> --8<---------------cut here---------------end--------------->8---
>
> Now run it:
>
> --8<---------------cut here---------------start------------->8---
>
> (gdb) run
>
> Starting program: /tmp/guix-build-libfaketime-0.9.9.drv-0/source/test/timetest
>
> /bin/sh: /lib/powerpc64le-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by ../src/libfaketime.so.1) /bin/sh: /lib/powerpc64le-linux-gnu/libc.so.6: version` GLIBC_2.32' not found (required by /gnu/store/kmblbljiygayhlc5gb02an9imhy90ws9-glibc-2.33/lib/libpthread.so.0)

Are you using Guix on a foreign distro? This line looks like your distro's normal libc.so was being used and it was from glibc-2.31 or older. The x86-64 systems I have that run pure Guix don't have any /lib*/ directories. You might try running gdb with LD_LIBRARY_PATH=/gnu/store/kmblbljiygayhlc5gb02an9imhy90ws9-glibc-2.33/lib to have the Guix libc.so picked up before the other one. HTH

Cheers,

Kaelyn

Toggle quote (36 lines)>
> /bin/sh: /lib/powerpc64le-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by /gnu/store/kmblbljiygayhlc5gb02an9imhy90ws9-glibc-2.33/lib/libdl.so.2) /bin/sh: /lib/powerpc64le-linux-gnu/libc.so.6: version` GLIBC_2.32' not found (required by /gnu/store/kmblbljiygayhlc5gb02an9imhy90ws9-glibc-2.33/lib/librt.so.1)
>
> During startup program exited with code 1.
>
> (gdb)
>
> --8<---------------cut here---------------end--------------->8---
>
> Huh? What happened? I've double checked that I'm using gdb provided by
>
> Guix:
>
> --8<---------------cut here---------------start------------->8---
>
> $ type -P gdb
>
> /gnu/store/32fjhp30k34fh0g9f1gmgcj8pc5wldq6-profile/bin/gdb
>
> --8<---------------cut here---------------end--------------->8---
>
> I also tried running gdb by invoking it via that absolute file name, and
>
> it still errored out in the same way.
>
> I'm operating in a --pure environment. All the tools are provided by
>
> Guix. I'm surprised that /bin/sh and /lib are even mentioned above.
>
> If anyone can provide any advice, I'd be very grateful. I'm not sure
>
> how to proceed.
>
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Chris

Thiago Jung Bauermann wrote on 22 Jul 2021 20:35

Recipients:

Message-ID:8085623.jmDMpusFku@popigai

Hello,

Em quarta-feira, 21 de julho de 2021, às 11:31:25 -03, Kaelyn escreveu:

Toggle quote (5 lines)> Hi,
> 
> ??????? Original Message ???????
> 
> On Wednesday, July 21st, 2021 at 1:08 AM, Chris Marusich 

<cmmarusich@gmail.com> wrote:

Toggle quote (19 lines)> > Now run it:
> > 
> > --8<---------------cut here---------------start------------->8---
> > 
> > (gdb) run
> > 
> > Starting program:
> > /tmp/guix-build-libfaketime-0.9.9.drv-0/source/test/timetest
> > 
> > /bin/sh: /lib/powerpc64le-linux-gnu/libc.so.6: version `GLIBC_2.33' not
> > found (required by ../src/libfaketime.so.1) /bin/sh:
> > /lib/powerpc64le-linux-gnu/libc.so.6: version` GLIBC_2.32' not found
> > (required by
> > /gnu/store/kmblbljiygayhlc5gb02an9imhy90ws9-glibc-2.33/lib/libpthread.
> > so.0)
> Are you using Guix on a foreign distro? This line looks like your
> distro's normal libc.so was being used and it was from glibc-2.31 or
> older.

GDB uses the shell to launch the debugged program. That is probably where

‘/bin/sh’ is entering the picture here. I don’t know whether that has any

relation to your foreign distro’s libc being used.

The output of `help run` in GDB mentions that the shell is specified by the

‘$SHELL’ environment variable. Perhaps you have that set?

One way to see if this is the problem is to use the GDB command

`set startup-with-shell off` to make it launch the debugged program without

the shell.

Toggle quote (5 lines)

> The x86-64 systems I have that run pure Guix don't have any

> /lib*/ directories. You might try running gdb with

> LD_LIBRARY_PATH=/gnu/store/kmblbljiygayhlc5gb02an9imhy90ws9-glibc-2.33/l

> ib to have the Guix libc.so picked up before the other one. HTH

Another alternative worth trying is the ‘--container’ option to ‘guix 
environment’, to completely isolate GDB from the foreign distro. You might 
want to add the coreutils package to the ‘--ad-hoc’ list so that you can 
get amenities such as an ls command. :-)

-- 
Thanks,
Thiago

Chris Marusich wrote on 23 Jul 2021 07:34

Recipients:(name . Kaelyn)(address . kaelyn.alexi@protonmail.com)

Message-ID:87v9511tla.fsf@gmail.com

Hi Kaelyn,

Thank you for the reply.

Kaelyn <kaelyn.alexi@protonmail.com> writes:

Toggle quote (7 lines)

> Are you using Guix on a foreign distro? This line looks like your

> distro's normal libc.so was being used and it was from glibc-2.31 or

> older. The x86-64 systems I have that run pure Guix don't have any

> /lib*/ directories. You might try running gdb with

> LD_LIBRARY_PATH=/gnu/store/kmblbljiygayhlc5gb02an9imhy90ws9-glibc-2.33/lib

> to have the Guix libc.so picked up before the other one. HTH

Yes, I'm using Guix on a foreign distro.  It isn't clear to me what is
trying to access the /lib directories.  That's what I'm trying to figure
out.  In a --pure environment using only Guix-built tools, one would
expect that I would not have to set LD_LIBRARY_PATH.  However, if I
can't figure it out, that's another trick I can try.

-- 
Chris

Chris Marusich wrote on 23 Jul 2021 08:01

Recipients:(name . Thiago Jung Bauermann)(address . bauermann@kolabnow.com)

Message-ID:87r1fp1sc9.fsf@gmail.com

Thiago Jung Bauermann <bauermann@kolabnow.com> writes:

Toggle quote (11 lines)> GDB uses the shell to launch the debugged program. That is probably where
> ‘/bin/sh’ is entering the picture here. I don’t know whether that has any 
> relation to your foreign distro’s libc being used.
>
> The output of `help run` in GDB mentions that the shell is specified by the 
> ‘$SHELL’ environment variable. Perhaps you have that set?
>
> One way to see if this is the problem is to use the GDB command
> `set startup-with-shell off` to make it launch the debugged program without 
> the shell.

Thank you for this suggestion. When I ran "set startup-with-shell off",

gdb successfully launched the program.

It seems something in the Guix-built software is trying to run /bin/sh.

Perhaps there is stray hard-coded path in GDB or something that needs to

be fixed... In any case, I'm glad I can continue debugging!

Toggle quote (10 lines)>> The x86-64 systems I have that run pure Guix don't have any
>> /lib*/ directories. You might try running gdb with
>> LD_LIBRARY_PATH=/gnu/store/kmblbljiygayhlc5gb02an9imhy90ws9-glibc-2.33/l
>> ib to have the Guix libc.so picked up before the other one. HTH
>
> Another alternative worth trying is the ‘--container’ option to ‘guix 
> environment’, to completely isolate GDB from the foreign distro. You might 
> want to add the coreutils package to the ‘--ad-hoc’ list so that you can 
> get amenities such as an ls command. :-)

When I tried "--container", gdb successfully launched the program. So

it's another viable work-around for the gdb issue.

As for the actual libfaketime bug, when it hung I pressed Control+C, and

here's the backtrace at that point:

Toggle snippet (7 lines)

(gdb) backtrace

#0 0x00007ffff7eccba0 in __futex_abstimed_wait_common64 (futex_word=0x7ffff7aaf1c0, expected=<optimized out>, clockid=<optimized out>, abstime=0x0, private=<optimized out>, cancel=<optimized out>) at ../sysdeps/nptl/futex-internal.c:74

#1 0x00007ffff7eb9934 in __pthread_clockjoin_ex (threadid=140737348563184, thread_return=0x7fffffffe2d0, clockid=<optimized out>, abstime=<optimized out>, block=<optimized out>) at pthread_join_common.c:102

#2 0x00007ffff7eb9684 in __pthread_join (threadid=<optimized out>, thread_return=<optimized out>) at pthread_join.c:24

#3 0x0000000010001784 in main (argc=1, argv=0x7fffffffe718) at timetest.c:146

Here's the entire session in which I built the problematic test and

debugged it, including a full back trace with local variables:

Toggle snippet (195 lines)[0] [env] marusich@suzaku:/tmp/guix-build-libfaketime-0.9.9.drv-0
$ ~/guix-core-updates/pre-inst-env guix environment libfaketime --ad-hoc gcc-toolchain@10.3.0:debug gdb
[0] [env] marusich@suzaku:/tmp/guix-build-libfaketime-0.9.9.drv-0
$ cd source/
[0] [env] marusich@suzaku:/tmp/guix-build-libfaketime-0.9.9.drv-0/source
$ make FAKETIME_COMPILE_CFLAGS='-DFORCE_MONOTONIC_FIX -g' CC=gcc PREFIX=/tmp/guix-build-libfaketime-0.9.9.drv-0/myprefix clean
make  -C src clean
make[1]: Entering directory '/tmp/guix-build-libfaketime-0.9.9.drv-0/source/src'
make[1]: Leaving directory '/tmp/guix-build-libfaketime-0.9.9.drv-0/source/src'
make  -C test clean
make[1]: Entering directory '/tmp/guix-build-libfaketime-0.9.9.drv-0/source/test'
make[1]: Leaving directory '/tmp/guix-build-libfaketime-0.9.9.drv-0/source/test'
[0] [env] marusich@suzaku:/tmp/guix-build-libfaketime-0.9.9.drv-0/source
$ make FAKETIME_COMPILE_CFLAGS='-DFORCE_MONOTONIC_FIX -g' CC=gcc PREFIX=/tmp/guix-build-libfaketime-0.9.9.drv-0/myprefix
make  -C src all
make[1]: Entering directory '/tmp/guix-build-libfaketime-0.9.9.drv-0/source/src'
gcc -o libfaketime.o -c -std=gnu99 -Wall -Wextra -Werror -Wno-nonnull-compare -DFAKE_PTHREAD -DFAKE_STAT -DFAKE_UTIME -DFAKE_SLEEP -DFAKE_TIMERS -DFAKE_INTERNAL_CALLS -fPIC -DPREFIX='"'/tmp/guix-build-libfaketime-0.9.9.drv-0/myprefix'"' -DLIBDIRNAME='"'/lib/faketime'"' -DFORCE_MONOTONIC_FIX -g   libfaketime.c
gcc -o libfaketime.so.1 -Wl,-soname,libfaketime.so.1  -lpthread -Wl,--version-script=libfaketime.map -shared libfaketime.o -ldl -lm -lrt
gcc -o libfaketimeMT.o -c -std=gnu99 -Wall -Wextra -Werror -Wno-nonnull-compare -DFAKE_PTHREAD -DFAKE_STAT -DFAKE_UTIME -DFAKE_SLEEP -DFAKE_TIMERS -DFAKE_INTERNAL_CALLS -fPIC -DPREFIX='"'/tmp/guix-build-libfaketime-0.9.9.drv-0/myprefix'"' -DLIBDIRNAME='"'/lib/faketime'"' -DFORCE_MONOTONIC_FIX -g  -DPTHREAD_SINGLETHREADED_TIME libfaketime.c
gcc -o libfaketimeMT.so.1 -Wl,-soname,libfaketimeMT.so.1  -lpthread -Wl,--version-script=libfaketime.map -shared libfaketimeMT.o -ldl -lm -lrt
gcc -o faketime -std=gnu99 -Wall -Wextra -Werror -Wno-nonnull-compare -DFAKE_PTHREAD -DFAKE_STAT -DFAKE_UTIME -DFAKE_SLEEP -DFAKE_TIMERS -DFAKE_INTERNAL_CALLS -fPIC -DPREFIX='"'/tmp/guix-build-libfaketime-0.9.9.drv-0/myprefix'"' -DLIBDIRNAME='"'/lib/faketime'"' -DFORCE_MONOTONIC_FIX -g   faketime.c  -lpthread -Wl,--version-script=libfaketime.map -lrt
make[1]: Leaving directory '/tmp/guix-build-libfaketime-0.9.9.drv-0/source/src'
[0] [env] marusich@suzaku:/tmp/guix-build-libfaketime-0.9.9.drv-0/source
$ make FAKETIME_COMPILE_CFLAGS='-DFORCE_MONOTONIC_FIX -g' CC=gcc PREFIX=/tmp/guix-build-libfaketime-0.9.9.drv-0/myprefix test
make  -C src all
make[1]: Entering directory '/tmp/guix-build-libfaketime-0.9.9.drv-0/source/src'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory '/tmp/guix-build-libfaketime-0.9.9.drv-0/source/src'
make  -C test all
make[1]: Entering directory '/tmp/guix-build-libfaketime-0.9.9.drv-0/source/test'
gcc -c -std=gnu99 -Wall -DFAKE_STAT -Werror -Wextra -DFORCE_MONOTONIC_FIX -g timetest.c
gcc -o timetest timetest.o -lrt -lpthread
./testframe.sh functests
# Begin Test Suites in functests

# Begin functests/test_exclude_mono.sh
# PLATFORM=linuxlike
out=1763825.60556745 When not faking monotonic time, timestamps should be different ref=1763826.62729077 - ok
# functests/test_exclude_mono.sh summary: 1 succeeded, 0 failed
# End functests/test_exclude_mono.sh - OK

# Begin functests/test_null.sh
out=0 () ref=1627019232 - ok
# functests/test_null.sh summary: 1 succeeded, 0 failed
# End functests/test_null.sh - OK

# Begin functests/test_true.sh
# functests/test_true.sh summary: 1 succeeded, 0 failed
# End functests/test_true.sh - OK

# Begin functests/test_walkone.sh
# PLATFORM=linuxlike
out=1 (secs since Epoch) - ok
out=2 (secs since Epoch) - ok
out=4 (secs since Epoch) - ok
out=8 (secs since Epoch) - ok
out=16 (secs since Epoch) - ok
out=32 (secs since Epoch) - ok
out=64 (secs since Epoch) - ok
out=128 (secs since Epoch) - ok
out=256 (secs since Epoch) - ok
out=512 (secs since Epoch) - ok
out=1024 (secs since Epoch) - ok
out=2048 (secs since Epoch) - ok
out=4096 (secs since Epoch) - ok
out=8192 (secs since Epoch) - ok
out=16384 (secs since Epoch) - ok
out=32768 (secs since Epoch) - ok
out=65536 (secs since Epoch) - ok
out=131072 (secs since Epoch) - ok
out=262144 (secs since Epoch) - ok
out=524288 (secs since Epoch) - ok
out=1048576 (secs since Epoch) - ok
out=2097152 (secs since Epoch) - ok
out=4194304 (secs since Epoch) - ok
out=8388608 (secs since Epoch) - ok
out=16777216 (secs since Epoch) - ok
out=33554432 (secs since Epoch) - ok
out=67108864 (secs since Epoch) - ok
out=134217728 (secs since Epoch) - ok
out=268435456 (secs since Epoch) - ok
out=536870912 (secs since Epoch) - ok
out=1073741824 (secs since Epoch) - ok
# functests/test_walkone.sh summary: 31 succeeded, 0 failed
# End functests/test_walkone.sh - OK

# Test Suites summary: 4 succeeded, 0 failed
# End Test Suites - OK

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)
^Cmake[1]: *** [Makefile:19: test] Interrupt
make: *** [Makefile:11: test] Interrupt

[130] [env] marusich@suzaku:/tmp/guix-build-libfaketime-0.9.9.drv-0/source
$ cd test/
[0] [env] marusich@suzaku:/tmp/guix-build-libfaketime-0.9.9.drv-0/source/test
$ gdb ./timetest
GNU gdb (GDB) 10.2
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "powerpc64le-unknown-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./timetest...
(gdb) set debug-file-directory /gnu/store/32fjhp30k34fh0g9f1gmgcj8pc5wldq6-profile/lib/debug
(gdb) add-auto-load-safe-path /gnu/store/kmblbljiygayhlc5gb02an9imhy90ws9-glibc-2.33/lib/libthread_db-1.0.so
(gdb) set environment LD_PRELOAD=../src/libfaketime.so.1
(gdb) set environment FAKETIME=-10d
(gdb) set environment NO_FAKE_STAT=1
(gdb) set startup-with-shell off
(gdb) run
Starting program: /tmp/guix-build-libfaketime-0.9.9.drv-0/source/test/timetest
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/gnu/store/kmblbljiygayhlc5gb02an9imhy90ws9-glibc-2.33/lib/libthread_db.so.1".
[New Thread 0x7ffff7aaf0f0 (LWP 2140545)]
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)
^C
Thread 1 "timetest" received signal SIGINT, Interrupt.
0x00007ffff7eccba0 in __futex_abstimed_wait_common64 (futex_word=0x7ffff7aaf1c0, expected=<optimized out>, clockid=<optimized out>, abstime=0x0, private=<optimized out>, cancel=<optimized out>) at ../sysdeps/nptl/futex-internal.c:74
74      ../sysdeps/nptl/futex-internal.c: No such file or directory.
(gdb) backtrace
#0  0x00007ffff7eccba0 in __futex_abstimed_wait_common64 (futex_word=0x7ffff7aaf1c0, expected=<optimized out>, clockid=<optimized out>, abstime=0x0, private=<optimized out>, cancel=<optimized out>) at ../sysdeps/nptl/futex-internal.c:74
#1  0x00007ffff7eb9934 in __pthread_clockjoin_ex (threadid=140737348563184, thread_return=0x7fffffffe2d0, clockid=<optimized out>, abstime=<optimized out>, block=<optimized out>) at pthread_join_common.c:102
#2  0x00007ffff7eb9684 in __pthread_join (threadid=<optimized out>, thread_return=<optimized out>) at pthread_join.c:24
#3  0x0000000010001784 in main (argc=1, argv=0x7fffffffe718) at timetest.c:146
(gdb) backtrace -full
#0  0x00007ffff7eccba0 in __futex_abstimed_wait_common64 (futex_word=0x7ffff7aaf1c0, expected=<optimized out>, clockid=<optimized out>, abstime=0x0, private=<optimized out>, cancel=<optimized out>) at ../sysdeps/nptl/futex-internal.c:74
        r4 = 265
        r7 = 0
        _arg5 = 0
        _arg2 = <optimized out>
        r5 = 2140545
        r8 = 4294967295
        _arg6 = 4294967295
        _arg3 = <optimized out>
        r0 = 221
        r3 = -512
        r6 = 0
        _arg4 = <optimized out>
        _arg1 = <optimized out>
        sc_cancel_oldtype = 0
        sc_ret = <optimized out>
        clockbit = <optimized out>
        err = <optimized out>
        op = <optimized out>
#1  0x00007ffff7eb9934 in __pthread_clockjoin_ex (threadid=140737348563184, thread_return=0x7fffffffe2d0, clockid=<optimized out>, abstime=<optimized out>, block=<optimized out>) at pthread_join_common.c:102
        ret = <optimized out>
        _buffer = {__routine = 0x7ffff7eb97d0 <cleanup>, __arg = 0x7ffff7aaf518, __canceltype = -6000, __prev = 0x0}
        tid = <optimized out>
        pd = 0x7ffff7aaf0f0
        self = <optimized out>
        result = 0
        pd_result = <optimized out>
#2  0x00007ffff7eb9684 in __pthread_join (threadid=<optimized out>, thread_return=<optimized out>) at pthread_join.c:24
No locals.
#3  0x0000000010001784 in main (argc=1, argv=0x7fffffffe718) at timetest.c:146
        now = 140737488347536
        tb = {time = 140737354082104, millitm = 1, timezone = 0, dstflag = 0}
        tv = {tv_sec = 140737354081200, tv_usec = 1}
        ts = {tv_sec = 140737354092312, tv_nsec = 0}
        timerid1 = 0x0
        timerid2 = 0x7ffff7f313ca
        sev = {sigev_value = {sival_int = -134273224, sival_ptr = 0x7ffff7ff2738}, sigev_signo = -1358151624, sigev_notify = 0, _sigev_un = {_pad = {-7632, 32767, 1140867716, 32767, -134571396, 32767, -134251008, 32767, -7888, 32767,
              -135299328, 32767}, _tid = -7632, _sigev_thread = {_function = 0x7fffffffe230, _attribute = 0x7fff44004284}}}
        its = {it_interval = {tv_sec = 140737488347536, tv_nsec = 140737353288760}, it_value = {tv_sec = 140737488347512, tv_nsec = 7737577984389116719}}
        mask = {__val = {4294967297, 140737488347472, 1, 0, 1, 140737354081200, 140737488347648, 0, 384, 140737353252608, 140737350926336, 140737350298984, 140737354086848, 0, 4294967295, 7883960601630828079}}
        sa = {__sigaction_handler = {sa_handler = 0x31325f6d68735f65, sa_sigaction = 0x31325f6d68735f65}, sa_mask = {__val = {215624265780, 9, 0, 140737354076688, 0, 0, 0, 0, 0, 0, 1392, 140737353287368, 140737353293872,
              140737353482696, 140737353288760, 140737353481312}}, sa_flags = -134274128, sa_restorer = 0x7fffffffe2b0}
        buf = {st_dev = 140733797368452, st_ino = 140737353809984, st_nlink = 140737354104320, st_mode = 4294959792, st_uid = 32767, st_gid = 4294959992, __pad2 = 32767, st_rdev = 268633376, st_size = 0, st_blksize = 0,
          st_blocks = 140737354076688, st_atim = {tv_sec = 140737488347824, tv_nsec = 140737488348952}, st_mtim = {tv_sec = 1, tv_nsec = 8}, st_ctim = {tv_sec = 0, tv_nsec = 140737352442432}, __glibc_reserved4 = 140737488347904,
          __glibc_reserved5 = 8, __glibc_reserved6 = 268442956}
        thread = 140737348563184
        ret = 0x7fffffffe300
        timer_getoverrun_timerid1 = -7816
        timer_getoverrun_timerid2 = 32767
(gdb)

I'll forward this information to upstream and ask if they need more.
I'll also let them know which version of the libraries (e.g., glibc) are
being used, since they said it might help to know.

-- 
Chris

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