Date: Sun, 28 Oct 2001 09:40:01 -0800 (PST) From: Chris Pockele <chrisp@belgacom.net> To: freebsd-bugs@FreeBSD.org Subject: Re: misc/30168: 4-stable, crash when writing to msdos fs Message-ID: <200110281740.f9SHe1O21729@freefall.freebsd.org>
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The following reply was made to PR misc/30168; it has been noted by GNATS.
From: Chris Pockele <chrisp@belgacom.net>
To: Kris Kennaway <kris@obsecurity.org>
Cc: freebsd-gnats-submit@FreeBSD.org, fs@FreeBSD.org
Subject: Re: misc/30168: 4-stable, crash when writing to msdos fs
Date: Sun, 28 Oct 2001 18:38:06 +0100
> Thanks, that was what's needed. Now to find an msdosfs guru to debug
> this :)
>
> Kris
>
Compiling msdosfs support as a module has solved the problem
for a long time (don't know why, but it didn't crash).
But after doing a cvsup + makeworld today,
it occured again (mounting & reading the msdos partition is ok,
panic when writing).
I searched the GNATS database and i found a few pr's that
seem to describe the same problem.
I applied the following patch from pr i386/28536, and it did
give me the error message (Next free cluster in FSInfo (%u)
exceeds maxcluster (%u)) when trying to mount the partition.
The scandisk programs from win98 and w2k don't report any
errors on the partitions, and Linux can write to them, too.
Should I recompile with unpatched sources and submit another
traceback?
Here's the patch:
/*
* Check and validate (or perhaps invalidate?) the fsinfo
structure? XXX
*/
+ if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster)
{
+ printf ("
+ pmp->pm_nxtfree, pmp->pm_maxcluster);
+ error = EINVAL;
+ goto error_exit;
+ }
/*
* Allocate memory for the bitmap of allocated clusters,
and then
Here are the error messages (with patch applied):
Oct 28 18:33:35 freedaemon /kernel: Next free cluster in FSInfo
(4294967295) exceeds maxcluster (1148401)
Oct 28 18:33:49 freedaemon /kernel: Next free cluster in FSInfo
(4294967295) exceeds maxcluster (1467070)
(there are two msdos partitions which i tried to mount)
Maybe it's because the partitions are bigger than 2 or 8 GB?
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