Bug#976922: systemd-bootchart: FTBFS on ppc64el: dh_auto_test: error: make -j160 check VERBOSE=1 returned exit code 2

[Lucas Nussbaum]

On 11/12/20 at 15:08 +0100, Michael Biebl wrote:
> Am 11.12.20 um 09:09 schrieb Lucas Nussbaum:
> > On 10/12/20 at 22:12 +0100, Michael Biebl wrote:
> > > Am 10.12.20 um 22:10 schrieb John Paul Adrian Glaubitz:
> > > > Hi Michael!
> > > > 
> > > > On 12/10/20 8:42 PM, Michael Biebl wrote:
> > > > > ============================================================================
> > > > > Testsuite summary for systemd-bootchart 233
> > > > > ============================================================================
> > > > > # TOTAL: 1
> > > > > # PASS:  1
> > > > > # SKIP:  0
> > > > > # XFAIL: 0
> > > > > # FAIL:  0
> > > > > # XPASS: 0
> > > > > # ERROR: 0
> > > > > ============================================================================
> > > > 
> > > > Did the test machine you used actually have that many cores?
> > > 
> > > No idea
> > 
> > I tried building with SMT off (so the machine only has 20 visible
> > cores). I could reproduce the failure. (I disabled SMT at runtime using
> > ppc64_cpu --smt=off)
> > 
> > It also fails when running 'make check VERBOSE=1' (so it's not caused by
> > parallelism).
> > 
> > It crashes with:
> > (gdb) r -o /tmp/tmp.k64Np1I2cr -n 10 -r -p
> > Starting program: /root/systemd-bootchart-233/systemd-bootchart -o /tmp/tmp.k64Np1I2cr -n 10 -r -p
> > [Thread debugging using libthread_db enabled]
> > Using host libthread_db library "/lib/powerpc64le-linux-gnu/libthread_db.so.1".
> > 
> > Program received signal SIGSEGV, Segmentation fault.
> > 0x0000000100004d04 in svg_ps_bars (interval=<optimized out>, graph_start=2775.3698308829998, ps_first=0x1000505d0, n_cpus=1,
> >      n_samples=10, head=0x100050770, of=0x1000503f0) at src/svg.c:1187
> > 1187	        i = ps->sample->next->sampledata->counter;
> > (gdb) bt
> > #0  0x0000000100004d04 in svg_ps_bars (interval=<optimized out>, graph_start=2775.3698308829998, ps_first=0x1000505d0,
> >      n_cpus=1, n_samples=10, head=0x100050770, of=0x1000503f0) at src/svg.c:1187
> 
> This looks a lot like
> 
> https://github.com/systemd/systemd-bootchart/pull/37
> specifically
> https://github.com/systemd/systemd-bootchart/pull/37/commits/65320230f5fcb02e81df5131a4dc03092558c263
> 
> Could you give this PR a try?

Hi,

This branch fixes the crash.

Lucas