[Expired for sane-backends (Ubuntu) because there has been no activity
for 60 days.]
** Changed in: sane-backends (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1557812
Title:
SEGFAULT when reinitializing a scanner
Status in sane-backends package in Ubuntu:
Expired
Bug description:
I have Canon Lide 220. I have libsane from Xenial (1.0.25) compiled
with debuild. If I initialize the scanner with sane_open(), then
immediately de-initialize it with sane_close(), and then sane_open()
again, sane_start() will crash after that. The crash happens in
genesys_low.c/sanei_genesys_generate_gamma_buffer() line #1240:
value=dev->sensor.gamma_table[GENESYS_RED][i];
The issue is that if I reinitialize the scanner, its gamma table is
lost (dev->sensor.gamma_table). After reinitializing sane_start()
tries to use non-initialized gamma table and crashes. Possible
WORKAROUND, NOT A FIX:
In genesys_low.c/sanei_genesys_asic_init() line #1378 find and comment
out the following code:
if (dev->already_initialized && !cold)
{
DBG (DBG_info, "%s: already initialized, nothing to do\n",
__FUNCTION__);
return SANE_STATUS_GOOD;
}
So it becomes
/* if (dev->already_initialized && !cold)
{
DBG (DBG_info, "%s: already initialized, nothing to do\n",
__FUNCTION__);
return SANE_STATUS_GOOD;
}
*/
After this ugly hack sane will reinitialize the gamma table every
time, and the application will not crash. Sample C++ app is attached.
Simply compile and run with Lide 220 connected.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: libsane 1.0.25+git20150528-1ubuntu2
ProcVersionSignature: Ubuntu 3.13.0-66.108-generic 3.13.11-ckt27
Uname: Linux 3.13.0-66-generic i686
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: i386
CurrentDesktop: KDE
Date: Tue Mar 15 17:36:02 2016
InstallationDate: Installed on 2015-10-24 (144 days ago)
InstallationMedia: Kubuntu 14.04.3 LTS "Trusty Tahr" - Beta i386 (20150805)
SourcePackage: sane-backends
UpgradeStatus: No upgrade log present (probably fresh install)
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