** Changed in: cups (Ubuntu)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1616548
Title:
Cups causes LibreOffice unittests to loop in a sbuild
Status in cups package in Ubuntu:
Fix Committed
Status in sbuild package in Ubuntu:
Incomplete
Status in winff package in Ubuntu:
Fix Committed
Bug description:
When building LibreOffice 1:5.2.0-0ubuntu1 on a xenial host with a
yakkety sbuild, e.g. by:
sbuild -A -d yakkety-amd64 (...).dsc
this loops/busy hangs with unittests. This was working ok up to
5.2.0~rc4 (=final), it is a regression by a LibreOffice dependency,
most likely CUPS, which was updated.
I tried to inject debug symbols by running with a: --chroot-setup-
command and then run something along the lines of:
apt install cups
wget http://launchpadlibrarian.net/278966811/cups-dbgsym_2.2~rc1-4_amd64.ddeb
wget
http://launchpadlibrarian.net/278966816/libcups2-dbgsym_2.2~rc1-4_amd64.ddeb
dpkg -i cups-dbgsym_2.2~rc1-4_amd64.ddeb
dpkg -i libcups2-dbgsym_2.2~rc1-4_amd64.ddeb
before starting the build proper, but I got only marginally better
debug info. The hanging LibreOffice test processes usually have 2-4
child processes. The parent and one of the childs are busy, while the
rest idle.
Here is a stacktrace of the busy child:
Program received signal SIGPIPE, Broken pipe.
0x00002b0a80dd615f in fgetspent (stream=0x11) at fgetspent.c:43
43 in fgetspent.c
(gdb) bt
#0 0x00002b0a80dd615f in fgetspent (stream=0x11) at fgetspent.c:43
#1 0x000000000000001e in ?? ()
#2 0x000055c4976981e0 in ?? ()
#3 0x00002b0a8aff8d20 in ipp_options () from
/usr/lib/x86_64-linux-gnu/libcups.so.2
#4 0x0000000000004002 in ?? ()
#5 0x00002b0a8ada9feb in ppdCollect2 (ppd=0x2b0a8ada9bdf
<cupsGetDestMediaDefault+415>, section=29, min_order=0, choices=0x2b0a8adad6f3
<cupsFileGetConf+467>) at emit.c:145
#6 0x0000000000000000 in ?? ()
Here is a stacktrace of the busy parent:
Thread 3 "CUPSManager cup" received signal SIGPIPE, Broken pipe.
0x00002b0a80dd615f in fgetspent (stream=0x11) at fgetspent.c:43
43 in fgetspent.c
(gdb) bt
#0 0x00002b0a80dd615f in fgetspent (stream=0x11) at fgetspent.c:43
#1 0x000000000000001e in ?? ()
#2 0x000055c4976981e0 in ?? ()
#3 0x00002b0a8aff8d20 in ipp_options () from
/usr/lib/x86_64-linux-gnu/libcups.so.2
#4 0x0000000000004002 in ?? ()
#5 0x00002b0a8ada9feb in ppdCollect2 (ppd=0x2b0a8ada9bdf
<cupsGetDestMediaDefault+415>, section=29, min_order=0, choices=0x2b0a8adad6f3
<cupsFileGetConf+467>) at emit.c:145
#6 0x0000000000000000 in ?? ()
When pressing "c" in gdb to continue, both processes stop very quickly again
with the SIGPIPE.
Venturing a guess: Is the signal handling of CUPS b0rked? As fgetspent reads
the shadow file[1], maybe there are missing permissions or other sandbox issues
that CUPS doesnt handle error cases for properly?
[1] http://linux.die.net/man/3/fgetspent
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