"5 seconds to fail" Re: 5.0.5-dev-3

[Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>]

On Aug 27,  6:28pm, Axel Beckert wrote:
}
} Hi,
} 
} On Sun, Aug 24, 2014 at 06:39:09PM +0100, Peter Stephenson wrote:
} > I think the only remaining open matter (excluding longer term issues
} > that aren't going to be dealt with immediately) is test failures in
} > some automated tests.
} 
} We again got a few build-failures on the build daemons, but this time
} on different architectures than with 5.0.5-dev-2, namely amd64 (Linux)
} and s390x while kfreebsd-amd64 worked fine this time:
} 
} https://buildd.debian.org/status/package.php?p=zsh&suite=experimental
} 
} On amd64 (aka x86_64) the testsuite was hanging and killed after 150
} minutes:
} https://buildd.debian.org/status/fetch.php?pkg=zsh&arch=amd64&ver=5.0.5-dev-3-1&stamp=1409099297
} 
} On s390x, gcc was killed after 150 minutes of inactivity:
} https://buildd.debian.org/status/fetch.php?pkg=zsh&arch=s390x&ver=5.0.5-dev-3-1&stamp=1409118602


I was able by accident to reproduce this in a foreground build on CentOS.
Can't say for sure it's exactly the same thing, but here's the stack trace
I got:

(gdb) where
#0  0x0086e7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
#1  0x009611ce in __lll_mutex_lock_wait () from /lib/tls/libc.so.6
#2  0x008efc0b in _L_mutex_lock_4191 () from /lib/tls/libc.so.6
#3  0x08010000 in ?? ()
#4  0x00000000 in ?? ()

That's literally all of it, no zsh source files at all, so I suspect
the job has already exited and is a zombie stuck on that mutex.  The
parent "runtests.zsh" script waiting for it has this trace:

(gdb) where
#0  0x0086e7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
#1  0x008afe8c in sigsuspend () from /lib/tls/libc.so.6
#2  0x080b6062 in signal_suspend (sig=17, wait_cmd=0)
    at ../../zsh-5.0/Src/signals.c:375
#3  0x08084b65 in zwaitjob (job=2, wait_cmd=0) at ../../zsh-5.0/Src/jobs.c:1454
#4  0x08084d3e in waitjobs () at ../../zsh-5.0/Src/jobs.c:1499
#5  0x08063753 in execpline (state=0xbfffc8b0, slcode=7170, how=2, last1=0)
    at ../../zsh-5.0/Src/exec.c:1554
#6  0x08062c57 in execlist (state=0xbfffc8b0, dont_change_job=1, exiting=0)
    at ../../zsh-5.0/Src/exec.c:1261
#7  0x0808c54b in execfor (state=0xbfffc8b0, do_exec=0)
    at ../../zsh-5.0/Src/loop.c:164
#8  0x080682ac in execcmd (state=0xbfffc8b0, input=0, output=0, how=18, 
    last1=2) at ../../zsh-5.0/Src/exec.c:3232
#9  0x08063fda in execpline2 (state=0xbfffc8b0, pcode=771, how=18, input=0, 
    output=0, last1=0) at ../../zsh-5.0/Src/exec.c:1691
#10 0x0806337f in execpline (state=0xbfffc8b0, slcode=48130, how=18, last1=0)
    at ../../zsh-5.0/Src/exec.c:1478
#11 0x08062c57 in execlist (state=0xbfffc8b0, dont_change_job=0, exiting=0)
    at ../../zsh-5.0/Src/exec.c:1261
#12 0x080626aa in execode (p=0xb7d1f778, dont_change_job=0, exiting=0, 
    context=0x813c823 "toplevel") at ../../zsh-5.0/Src/exec.c:1070
#13 0x0807d636 in loop (toplevel=1, justonce=0) at ../../zsh-5.0/Src/init.c:185
#14 0x0808094b in zsh_main (argc=4, argv=0xbfffca04)
    at ../../zsh-5.0/Src/init.c:1625
#15 0x0804c0a6 in main (argc=4, argv=0xbfffca04) at ../../zsh-5.0/Src/main.c:93