Bug 91381 - (SCSI PPA)kernel-2.4.20-6 zip ppa can't mount drives
Summary: (SCSI PPA)kernel-2.4.20-6 zip ppa can't mount drives
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: kernel   
(Show other bugs)
Version: 9
Hardware: i586
OS: Linux
Target Milestone: ---
Assignee: Arjan van de Ven
QA Contact: Brian Brock
: 91001 91171 97177 (view as bug list)
Depends On:
TreeView+ depends on / blocked
Reported: 2003-05-22 02:40 UTC by Robert Crisler
Modified: 2007-04-18 16:53 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2004-09-30 15:40:58 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Robert Crisler 2003-05-22 02:40:31 UTC
Description of problem:
Possible Zip drive bug with kernel-2.4.20-13.9.i586.rpm
Think there might be a bug with the above kernel. When mounting a zip
drive, (an ancient parallel port zip drive at that), get an invalid block
device error along with unable to read partition table. Went back to
kernel-2.4.20-6 and have no problems. 

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
Actual results:

Expected results:

Additional info:

Comment 1 Lon Hohberger 2003-05-22 18:12:29 UTC
Giving to someone on the kernel team.

Comment 2 Alan Cox 2003-06-08 13:29:10 UTC
*** Bug 91171 has been marked as a duplicate of this bug. ***

Comment 3 Alan Cox 2003-06-08 13:41:33 UTC
*** Bug 91001 has been marked as a duplicate of this bug. ***

Comment 4 chrisw 2003-06-12 21:32:34 UTC
I am pasting this from another response i got from my post about 
the external zip drive problem..maybe this will help you guys out.

PLEASE read the following about what was discovered by a fellow redhat user:

Progress! I think :-) I looked into this and the problem seems to be in the
kernel source file '/usr/src/linux-2.4/drivers/scsi/scsi_error.c'. A line was
added between the 2.4.20-8 and 2.4.20-13.9 kernel versions.

In the file starting at line 464 we have:

        /* Last chance to have valid sense data */
        if (!scsi_sense_valid(SCpnt))
                memcpy((void *) SCpnt->sense_buffer,

        if (scsi_result != &scsi_result0[0] && scsi_result != NULL)

         * When we eventually call scsi_finish, we really wish to complete
         * the original request, so let's restore the original data. (DB)
        memcpy((void *) SCpnt->cmnd, (void *) SCpnt->data_cmnd,
        SCpnt->result = saved_result;
        SCpnt->request_buffer = SCpnt->buffer;
        SCpnt->request_bufflen = SCpnt->bufflen;
        SCpnt->use_sg = SCpnt->old_use_sg;
        SCpnt->cmd_len = SCpnt->old_cmd_len;
        SCpnt->sc_data_direction = SCpnt->sc_old_data_direction;
        SCpnt->underflow = SCpnt->old_underflow;
==>     memset(SCpnt->sense_buffer, 0, sizeof(SCpnt->sense_buffer));

The last line was added. I removed this line and rebuilt the kernel, and the zip
drive worked fine. Put it back in, and the drive fails again.

As can be seen the first part of this code snippet states that if the sense data
is invalid then it tries to set it valid using a memcpy. This however gets
overwritten (it seems) by the added memset. Since the intermediate statements
seem to be just assignments and not subroutine/function calls, so the value of
the sense buffer has not (I assume!) been changed since the initial memcpy.

To me this then looks wrong. The sense buffer is set, then overwritten (I think
I read that setting values to 0 make it invalid). From then onwards it seems
that the scsi error handler cannot resolve the 'problem' with the drive so
eventually takes it offline. Of course why the zip drive has invalid sense data
to start with is beyond me, but the 'Last chance' to correct it obviously works
since the zip drive works okay in the 2.4.20-8 kernel. Likewise I assume the
memset was added for a reason, so just removing it will probably break something
else! :-) I could not tell from the kernel changelog why the change was made.

I think this is as far as I can go with this. I hope the RedHat people can make
more sense of it for us :-)

Comment 5 chrisw 2003-06-12 21:34:56 UTC
i am using the IMM module for the zip drive. the above mentioned post i had 
previously posted the person was also using the imm module..

Comment 6 Caeies 2003-06-14 15:02:40 UTC
*** Bug 97177 has been marked as a duplicate of this bug. ***

Comment 7 chrisw 2003-06-19 15:07:21 UTC
I have checked the scsi_error.c file from the redhat kernel with the 
scsi_error.c file of the tar.gz kernel package from www.kernel.org
and the line commented out that is mentioned above IS NOT in the tar.gz kernel 
file from www.kernel.org.

so for some reason redhat has added that line in that file...
i dont think its a bug ...but redhat has some sort of reason why
they added that line....so i think im going to comment out the line so i can 
use my zip drive.

Comment 8 Alan Cox 2003-06-22 13:15:04 UTC
Reverting the line seems correct. It was fixing a bug but that bug seems to
actually be in a different driver not the core.

Comment 9 chrisw 2003-06-24 21:11:56 UTC
since commenting the line out and recompiling my kernel, my system
has been up and running with no problems for 1 week now...
Just wanted to give an update on my progress..So I believe 
that the line should be taken out of upcoming kernels to fix
this problem...It might also help with the other zip problems
also...be it IDE and also with the SMP problems that I 
have read on bugzilla about this problem

Would you agree Alan?

Comment 10 Bugzilla owner 2004-09-30 15:40:58 UTC
Thanks for the bug report. However, Red Hat no longer maintains this version of
the product. Please upgrade to the latest version and open a new bug if the problem

The Fedora Legacy project (http://fedoralegacy.org/) maintains some older releases, 
and if you believe this bug is interesting to them, please report the problem in
the bug tracker at: http://bugzilla.fedora.us/

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