Complete lock up's on heavy floppy reads.

Nils Rennebarth (nils@nus.pan-net.de)
Fri, 26 Apr 1996 12:51:11 +0200 (MET DST)


Description:
I can reproducibly and reliably lock up my complete machine by reading=20
the contents of 3.5" floppies and comparing this to the files on the=20
harddisk.

Writing floppies appears to be no problem.

Hardware:
ASUS PC/I 486 SP3G motherboard, 16MB RAM, two NEC D3845 1GB Harddisks,
using NRC 53c810 SCSI controller.

Software:
a.out system (debian) with libc-4.6.27 (latest stable a.out),
Kernel 1.3.92 to 1.3.95, floppy compiled in the kernel, a mostly standa=
rd=20
configuration, a few modules loaded:
Module: #pages: Used by:
teles 14
isdn 15 [teles]
bsd_comp 1
slip 2
ppp 5 [bsd_comp]
slhc 2 [isdn ppp]
3c509 2
lp 2
binfmt_elf 2
nfs 11
isofs 5
msdos 6 <<<<<<<----- could it be this one??

This does not happen with 1.2.13

Detailed description:
I made a series of demo-copies on floppy disks. A set of floppies=20
consists of five disks, the first a mixture of different files, the res=
t=20
all with a single file filling up the whole floppy.

Writing these files using
mount /floppy # /floppy is in /etc/fstab, a msdos filesystem
cp -a source_directory/* /floppy
umount /floppy
causes no problem whatsoever. I wrote more than twenty floppies this wa=
y=20
yesterday.

Reading the floppies (write protected now) using either
mount /floppy
diff -r /floppy source_directory

or
mtype a:bigfile | cmp source_directory/bigfile

will lock up the machine on at least every third try, often the first o=
ne=20
will do already. The mouse freezes (always running X), no pings from a=20
remote system work, console-changing keys stop working, no disk activit=
y,=20
floppy light stays on until I press the reset button.

No traces of the crash whatsoever in the system logs. The crash seems=20
unrelated to system load and disk activity.

PLEASE HELP!! Am I the only one with this problem?

I'll try to make msdos compiled in, see if that makes any difference=20
(That was a change I made about two weeks ago, and did not heavyly use=20
floppy reads since then) Other ideas?=20

--
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61=20
>>I'd also be interested in the comparison [of Linux] | 37083 G=F6tting=
en
>>with a cisco router. I assume a factor of about ten.| ++49-551-71626
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