Unable to emerge gcc and many packages

atrix · n00b Joined: 25 Jun 2016 Posts: 30

An old issue I was facing back in March has resurfaced. Several packages will "hang" during compilation (100% CPU usage on a single core and will not progress further). I made a post back then and did quite a bit of troubleshooting trying to narrow down the root cause, but was unable to - https://forums.gentoo.org/viewtopic-t-1148318-view-previous.html . Ultimately, I rebuilt my system in a stage 3 chroot and copied it to my actual system and things were working as expected up until December.

All of the symptoms described in my previous post are suddenly present again - no I/O, no strace output, no overutilization of memory/swapping, nothing in kernel logs. The same problematic packages will not build unless I remove -O optimization in gcc, and this only works for some packages (opus). Some packages will build with my normal flags, many will not.

GCC appears to be the culprit here, and I am unable to upgrade, downgrade, or rebuild the current version of both gcc 11 and gcc 12. When attempting to emerge any version of gcc, progress stops and f951 is using 100% of a single core. Another example is libtool, the build hangs and cc1 uses 100% of a single core.

I've tried restoring gcc from several different backups but see the same behavior. I've also pulled gcc from stage3, same result. My understanding is that gcc builds the tools needed to build itself in a "clean" environment after using some low level tools to build an environment for itself, presumably f951 (fortran?), so not seeing a difference between older versions that used to work and from stage3 was surprising to me. I don't understand gcc enough to know what I'm missing and am assuming it has to do with something that was upgraded in late November or early December, but I'm unable to downgrade a handful of packages to test due to the issue with gcc, so I'm stuck on this one and am unable to update my system. This is a list of packages emerged around the time I believe the problem started (https://dpaste.com/5VSHW4BMS).

I can restore from backup, but since this is the second instance of this occurring I'm really hoping to determine why it's happened again so I know how to deal with this going forward.

SessionID removed by NeddySeagoon

NeddySeagoon · Posted: Mon Jan 16, 2023 11:05 am Post subject:

atrix,

Post your

atrix · n00b Joined: 25 Jun 2016 Posts: 30

Sure thing.

emerge --info:

NeddySeagoon · Posted: Mon Jan 16, 2023 7:11 pm Post subject:

atrix,

With only 4G RAM,

atrix · n00b Joined: 25 Jun 2016 Posts: 30

Thanks Neddy,

Those MAKEOPTS are there because I typically use distcc, but I've changed this to '-j2' and am using your recommended CFLAGS to simplify things. This is an Odroid N2+

I don't see anything from OOM in dmesg, but will keep an eye on this.

I've restored gcc (11), glibc, binutils and texinfo from stage3 quickpkg binaries. I selected gcc 11 in eselect/gcc-config. Emerging opus failed with "C compiler cannot create executables." I emerged binutils, then opus again and did not encounter the error but am getting stuck on

NeddySeagoon · Posted: Mon Jan 16, 2023 9:06 pm Post subject:

atrix,

The configure.log file may be useful when it gets stuck.

Ahh ... check your system time. Some configure scripts check that the files they have just generated are newer than the input files.
If they are not, configure runs again ... and again .... until they are.

On a Pi, the system time starts at 01-Jan-70, so you have over a 53 year wait for that to resolve itself.
Its possible to provoke a similar effect if the system clock was fast, then gets stepped back.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

atrix · n00b Joined: 25 Jun 2016 Posts: 30

Would the configure.log be in /var/log/portage? Or is this the configure portion of the build log?

I was hoping my time was off after reading your comment, but sadly, no, all looks good there..

I don't know what other packages would come into play here after reviewing https://wiki.gentoo.org/wiki/Project:Toolchain. I've restored everything listed here from stage3. Maybe time to start restoring packages in @system?

NeddySeagoon · Posted: Mon Jan 16, 2023 9:35 pm Post subject:

atrix,

It's in the packages /work/ dir somewhere near the top. In /var/tmp/portage/....
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

atrix · n00b Joined: 25 Jun 2016 Posts: 30

Thank you. I haven't found anything telling yet, and some packages make it past the configure stage, but I'm continuing to test with different packages until I can make some more sense of what's going on. I'm shooting blindly with quickpkg from stage3 now, no luck yet...

atrix · n00b Joined: 25 Jun 2016 Posts: 30

Found the issue. You were right, Neddy. Rebuilding gmp with the safe/vanilla CFLAGS you suggested appears to have fixed this. I'm going to upgrade @world overnight and will report back if anything gets stuck, but I haven't been able to reproduce the issue on any of the previously problematic packages after rebuilding gmp. Thanks for your help with this.