On Fri, 17 May, 2013 at 8:45 AM, Christian Kastner <deb...@kvr.at>
wrote:
On 2013-05-16 09:47, Simon McVittie wrote:
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ACK
On 16/05/13 07:00, Christian Kastner wrote:
Would it be possible to include [a fix for libdbus-related
thread-safety problems in colord] in the next Wheezy point
release (7.0.1)?
I suspect the necessary changes to be rather too large for a stable
update, given that the changelog describes it as a "rewrite".
However, a
necessary first step would be for people who reliably get this
crash to
confirm that 0.1.31 actually fixes it.
I will try to confirm this over the weekend, but I too doubt that a
rewrite will be accepted into a point release.
It looks as though a less intrusive fix for wheezy might be to drop
the
"full" SANE plugin and instead backport the udev-based
cd-plugin-scanner
module added by commit ebf3e961, which can detect local scanners
but not
networked ones:
+# If we should use SANE to add scanner and camera devices.
+#
+# If SANE support is installed then this will allow colord to
manage
+# all scanners that SANE can detect, including remote scanners.
+#
+# If this is disabled then colord will only detect locally
connected
+# scanners.
Another possibility for a "lightweight" workaround would be to set
UseSANE to false in the default configuration file, which would
result
in colour correction for screens and printers but not scanners.
I haven't had any response to the upstream libsane bug I opened
querying
some code used by colord-sane that uses threads but does not look
thread-safe
(<https://alioth.debian.org/tracker/index.php?func=detail&aid=313921&group_id=30186&atid=410366>).
Adding a call to dbus_threads_init_default() early in colord-sane's
main() can't hurt, either.
This was done in colord 0.1.21-2 (and fixed for !Linux in -3); it fixes
the dbus crash, but this leaves the
fd-leak-resulting-in-100%-CPU-use-in-select() bug.
Probably the best thing to do is to pull in 0.1.21-4. That has a number
of miscellaneous fixes, and a rework of colord-sane that avoids all the
problems. I should probably have pushed this past the freeze.
Although that's a significant patch, it might be reasonable for a point
release as the existing colord-sane is broken everywhere, so it's
difficult to make things worse.
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