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<TITLE>sane-devel: Re: SIGSEGV in sense_handler (scsi_fd=0, result=0x8</TITLE>
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<META NAME="Subject" CONTENT="Re: SIGSEGV in sense_handler (scsi_fd=0, result=0x831d470 "", arg=0x0) at mustek.c:604">
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<H1>Re: SIGSEGV in sense_handler (scsi_fd=0, result=0x831d470 "", arg=0x0) at mustek.c:604</H1>
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<STRONG>From:</STRONG> Henning Meier-Geinitz (<A HREF="mailto:hmg-ml@gmx.de?Subject=Re:%20SIGSEGV%20in%20sense_handler%20(scsi_fd=0,%20result=0x831d470%20"",%20arg=0x0)%20at%20mustek.c:604&In-Reply-To=<20001101212520.D18944@vortex.swb.de>"><EM>hmg-ml@gmx.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Wed Nov 01 2000 - 12:25:20 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0015.html">Yuri Dario: "Re: SANE on OS/2 (Was: new snapscan user)"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0013.html">Henning Meier-Geinitz: "Re: X-Frontends (xscanimage+xcam) and sane-1.0.4"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0002.html">Andreas Klemm: "SIGSEGV in sense_handler (scsi_fd=0, result=0x831d470 "", arg=0x0) at mustek.c:604"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0031.html">Andreas Klemm: "Re: SIGSEGV in sense_handler (scsi_fd=0, result=0x831d470 "", arg=0x0) at mustek.c:604"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0031.html">Andreas Klemm: "Re: SIGSEGV in sense_handler (scsi_fd=0, result=0x831d470 "", arg=0x0) at mustek.c:604"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0066.html">Andreas Klemm: "Re: SIGSEGV in sense_handler (scsi_fd=0, result=0x831d470 "", arg=0x0) at mustek.c:604"</A>
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<P>
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Hi,
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<BR>
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<P>On Wed, Nov 01, 2000 at 03:33:10PM +0100, Andreas Klemm wrote:
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<BR>
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<EM>> xsane and xscanimage core dump after approx. scanning 75% of an image.
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</EM><BR>
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<EM>> I compiled sane and xsane with debugging symbols and below you can
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</EM><BR>
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<EM>> see, what sense code the application got in mustek.c ...
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</EM><BR>
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<P>This is really a high-quality bug report :-) Nearly every information
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<BR>
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I can think of is provided. This is SANE 1.0.3, isn't it? There is a
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<BR>
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bug in the Mustek backend; result and arg aren't checked for NULL
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<BR>
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before they are dereferenced. This bug is fixed in the CVS version of
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<BR>
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SANE and the bugfix will be in SANE 1.0.4. The code at the beginning
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<BR>
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of sense_handler() now is something like this:
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<BR>
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<P> if (!result)
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<BR>
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{
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<BR>
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DBG(5, "sense_handler: no sense buffer\n");
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<BR>
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return SANE_STATUS_IO_ERROR;
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<BR>
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}
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<BR>
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if (!arg)
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<BR>
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DBG(5, "sense_handler: got sense code %02x for fd %d (arg = null)\n",
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<BR>
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result[0], scsi_fd);
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<BR>
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else
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<BR>
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DBG(5, "sense_handler: got sense code %02x for fd %d (arg = %uc)\n",
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<BR>
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result[0], scsi_fd, *(unsigned char*) arg);
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<BR>
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<P>instead of
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<BR>
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<BR>
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DBG(5, "sense_handler: got sense code %02x for fd %d (arg = %uc)\n",
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<BR>
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result[0], scsi_fd, *(unsigned char*) arg);
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<BR>
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<BR>
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I don't know if this is the solution to your problem. Give it a try.
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<BR>
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The segfault happens after a call to stop_scan so the scan should be
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<BR>
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finished at this point.
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<BR>
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<P>If this doesn't help, try a new Mustek-backend from
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<BR>
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<A HREF="http://hmg.home.pages.de/sane/">http://hmg.home.pages.de/sane/</A> .
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<BR>
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<P><EM>> I use the Centronix port on the scanner. Do I need perhaps to terminate
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</EM><BR>
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<EM>> on the 25 pol. connector ???
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</EM><BR>
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<P>That's the end of the SCSI chain so it must be terminated. However, in
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<BR>
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my experience the scanner works without termination if it's the only
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<BR>
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device on the controller.
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<BR>
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<BR>
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<EM>> With the AHA2940U automatic termination and termination on caused
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</EM><BR>
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<EM>> no problem. I already set SCSI speed to 10 MB/sec. and the devices
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</EM><BR>
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<EM>> speed to 5 MB and no sync transfers.
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</EM><BR>
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<P>With some scanners and some SCSI drivers it seems to be necessary to
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<BR>
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deactivate SCSI disconnection but I don't think that's true in this
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<BR>
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case.
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<BR>
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<P><EM>> Do I have a termination problem ???? Any idea ???
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</EM><BR>
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<P>I don't think so but you never know. If scanning doesn't work after
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<BR>
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using the new backend, please try
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<BR>
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<P>SANE_DEBUG_MUSTEK=5 xsane 2>dbg.log
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<BR>
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<P>Scan an image and send the resulting dbg.log to me.
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<BR>
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<P><EM>> Do I need to put a terminator on the Scanner onto the 25 pol adapter
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</EM><BR>
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<EM>> or is the scanner auto terminated ???
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</EM><BR>
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<P>The scanner is not auto terminated.
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<BR>
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<P>Ciao,
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<BR>
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Henning
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<BR>
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<P><PRE>
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--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20SIGSEGV%20in%20sense_handler%20(scsi_fd=0,%20result=0x831d470%20"",%20arg=0x0)%20at%20mustek.c:604&In-Reply-To=<20001101212520.D18944@vortex.swb.de>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0015.html">Yuri Dario: "Re: SANE on OS/2 (Was: new snapscan user)"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0013.html">Henning Meier-Geinitz: "Re: X-Frontends (xscanimage+xcam) and sane-1.0.4"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0002.html">Andreas Klemm: "SIGSEGV in sense_handler (scsi_fd=0, result=0x831d470 "", arg=0x0) at mustek.c:604"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0031.html">Andreas Klemm: "Re: SIGSEGV in sense_handler (scsi_fd=0, result=0x831d470 "", arg=0x0) at mustek.c:604"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0031.html">Andreas Klemm: "Re: SIGSEGV in sense_handler (scsi_fd=0, result=0x831d470 "", arg=0x0) at mustek.c:604"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0066.html">Andreas Klemm: "Re: SIGSEGV in sense_handler (scsi_fd=0, result=0x831d470 "", arg=0x0) at mustek.c:604"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Wed Nov 01 2000 - 14:42:19 PST</EM>
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