Libguestfs - Jul 2023 - nbdkit build failure (was: Re: jplesnik's nbdkit-1.35.5-4.fc39 failed to build)

On Tue, Jul 11, 2023 at 07:31:07PM +0100, Richard W.M. Jones
wrote:
> 
> https://koji.fedoraproject.org/koji/buildinfo?buildID=2230411
> 
> It's a bit of a coincidence that this failed exactly in the Perl test
> & you're upgrading Perl.  On the other hand, it really looks like
it
> might have been a temporary failure.
> 
> Could you resubmit the build?  If it happens again then I'll take a
> closer look.
Thanks for resubmitting this.  It looks as if it failed again:

https://koji.fedoraproject.org/koji/taskinfo?taskID=103238055

& the failure _is_ related to perl (surprisingly), or at least it
fails in the same way.

I will try to have a look at this, but if you would like to file a BZ
then that will ensure that we don't forget about it.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
nbdkit - Flexible, fast NBD server with plugins
https://gitlab.com/nbdkit/nbdkit

On Tue, Jul 11, 2023 at 09:23:35PM +0100, Richard W.M. Jones
wrote:
> On Tue, Jul 11, 2023 at 07:31:07PM +0100, Richard W.M. Jones wrote:
> > 
> > https://koji.fedoraproject.org/koji/buildinfo?buildID=2230411
> > 
> > It's a bit of a coincidence that this failed exactly in the Perl
test
> > & you're upgrading Perl.  On the other hand, it really looks
like it
> > might have been a temporary failure.
> > 
> > Could you resubmit the build?  If it happens again then I'll take
a
> > closer look.
> 
> Thanks for resubmitting this.  It looks as if it failed again:
> 
> https://koji.fedoraproject.org/koji/taskinfo?taskID=103238055
> 
> & the failure _is_ related to perl (surprisingly), or at least it
> fails in the same way.
The next build failure looks identical as well:

https://koji.fedoraproject.org/koji/taskinfo?taskID=103297793

So it seems like this is a problem in the perl plugin (or maybe with
the new version of perl).
> I will try to have a look at this, but if you would like to file a BZ
> then that will ensure that we don't forget about it.
Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-top is 'top' for virtual machines.  Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://people.redhat.com/~rjones/virt-top

It's a crash in Perl code, although called from the nbdkit perl plugin
(C bindings).  Still debugging this ...

Core was generated by `/home/rjones/d/nbdkit/server/nbdkit -U
/tmp/nbdkittPN34a/sock -P /tmp/nbdkittPN'.
Program terminated with signal SIGSEGV, Segmentation fault.

warning: Section `.reg-xstate/150177' in core file too small.
#0  Perl_my_snprintf (buffer=0x7f3a1e5fc630 "p\310_\036:\177", len=32,
    format=0x7f3a1ef7e322 "_<(eval %lu)")
    at /usr/src/debug/perl-5.38.0-499.fc39.x86_64/util.c:5248
Downloading source file /usr/src/debug/perl-5.38.0-499.fc39.x86_64/util.c
5248            WITH_LC_NUMERIC_SET_TO_NEEDED(                                  
[Current thread is 1 (Thread 0x7f3a1e5fd6c0 (LWP 150177))]
(gdb) bt
#0  Perl_my_snprintf (buffer=0x7f3a1e5fc630 "p\310_\036:\177", len=32,
    format=0x7f3a1ef7e322 "_<(eval %lu)")
    at /usr/src/debug/perl-5.38.0-499.fc39.x86_64/util.c:5248
#1  0x00007f3a1ed8545f in Perl_pp_entereval (my_perl=0xcb39c90)
    at /usr/src/debug/perl-5.38.0-499.fc39.x86_64/pp_ctl.c:5107
#2  0x00007f3a1ed2d5e8 in Perl_runops_standard (my_perl=0xcb39c90)
    at /usr/src/debug/perl-5.38.0-499.fc39.x86_64/run.c:41
#3  0x00007f3a1ec73ddc in Perl_eval_sv (my_perl=my_perl at entry=0xcb39c90, 
    sv=sv at entry=0xcb3d2b8, flags=flags at entry=2)
    at /usr/src/debug/perl-5.38.0-499.fc39.x86_64/perl.c:3269
#4  0x00007f3a1ec740e0 in Perl_eval_pv (my_perl=0xcb39c90, p=<optimized
out>,
    croak_on_error=croak_on_error at entry=0)
    at /usr/src/debug/perl-5.38.0-499.fc39.x86_64/perl.c:3359
#5  0x00007f3a1fc9e6ca in callback_defined (
    perl_func_name=perl_func_name at entry=0x7f3a1fca21af "can_write")
    at /home/rjones/d/nbdkit/plugins/perl/perl.c:102
#6  0x00007f3a1fc9f28c in perl_boolean (handle=0xcb7a350, 
    callback_name=0x7f3a1fca21af "can_write", fn_name=0x7f3a1fca21b3
"write")
    at /home/rjones/d/nbdkit/plugins/perl/perl.c:430
#7  0x000000000040e290 in plugin_can_write (c=<optimized out>) at
plugins.c:488
#8  0x00000000004078fe in backend_can_write (c=0x7f3a18000fb0) at backend.c:462
#9  0x0000000000410ea9 in protocol_common_open (
    exportsize=exportsize at entry=0x7f3a1e5fca00, 
    flags=flags at entry=0x7f3a18000e84, 
    exportname=exportname at entry=0x7f3a18000f90 "") at
protocol-handshake.c:103
#10 0x00000000004112ab in finish_newstyle_options (
    exportsize=exportsize at entry=0x7f3a1e5fca00, exportname_in=<optimized
out>,
    exportnamelen=exportnamelen at entry=0) at protocol-handshake-newstyle.c:319
#11 0x00000000004125e1 in negotiate_handshake_newstyle_options ()
    at protocol-handshake-newstyle.c:619
#12 protocol_handshake_newstyle () at protocol-handshake-newstyle.c:985
#13 0x0000000000410e15 in protocol_handshake () at protocol-handshake.c:55
#14 0x000000000040a474 in handle_single_connection (sockin=6, 
    sockout=<optimized out>) at connections.c:180
#15 0x0000000000414baf in start_thread (datav=0xcb2c4f0) at sockets.c:377
#16 0x00007f3a1f68db37 in start_thread (arg=<optimized out>)
    at pthread_create.c:444
#17 0x00007f3a1f714bec in clone3 ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
nbdkit - Flexible, fast NBD server with plugins
https://gitlab.com/nbdkit/nbdkit