RE: Linux-2.4.5 and Reiserfs, oops!

RE: Linux-2.4.5 and Reiserfs, oops!

[Chris Rankin]

Hi,

Thanks for the patch; I successfully unmounted my reiserfs USB Zip 250
MB disc. However, the box then locked up hard when I unmounted an NFS
mount and tried to switch to another virtual console.

Chris

RE: Linux-2.4.5 and Reiserfs, oops!

[Alexander Viro]

On Sat, 26 May 2001, Chris Rankin wrote:

> Hi,
> 
> Thanks for the patch; I successfully unmounted my reiserfs USB Zip 250
> MB disc. However, the box then locked up hard when I unmounted an NFS
> mount and tried to switch to another virtual console.

That's... interesting. With that patch changes to fs/super.c should make
no difference whatsoever.

OK, can you reproduce NFS lockup on 2.4.5-pre5 (without that patch)
and on 2.4.5-pre3 (ditto)? 

There were NFS changes in -pre4 and -pre5 and umount ones in -pre6. The
latter need the patch I've posted, so vanilla -pre5 and -pre3 are the
first candidates for checking.

Re: Linux-2.4.5 and Reiserfs, oops!

[Chris Rankin]

> That's... interesting. With that patch changes to fs/super.c should make
> no difference whatsoever.
> 
> OK, can you reproduce NFS lockup on 2.4.5-pre5 (without that patch)
> and on 2.4.5-pre3 (ditto)? 
> 
> There were NFS changes in -pre4 and -pre5 and umount ones in -pre6. The
> latter need the patch I've posted, so vanilla -pre5 and -pre3 are the
> first candidates for checking.

Well the first thing I checked was vanilla 2.4.5, and I managed to
bring that down hard too. It has nothing at all to do with reiserfs,
but may be related to USB instead. I have been able to reproduce the
problem by doing the following:

a) Booting with X on vc/2
b) Logging into vc/6 instead
c) Mounting a filesystem on my USB Zip drive
d) Unmounting the filesystem again
e) Unmounting the NFS mount
f) Executing "rmmod -a" twice to clean out the now-unused modules
(e.g. sd_mod, scsi_mod, usb-storage)
g) Trying to switch back to vc/2
h) Oops!

2.4.4 seems OK; I guess I'll have to build those -pre kernels now.

Chris

Re: Linux-2.4.5 and Reiserfs, oops!

[Alexander Viro]

On Sat, 26 May 2001, Chris Rankin wrote:

> Well the first thing I checked was vanilla 2.4.5, and I managed to
> bring that down hard too. It has nothing at all to do with reiserfs,
> but may be related to USB instead. I have been able to reproduce the
> problem by doing the following:
> 
> a) Booting with X on vc/2
> b) Logging into vc/6 instead
> c) Mounting a filesystem on my USB Zip drive
> d) Unmounting the filesystem again
> e) Unmounting the NFS mount
> f) Executing "rmmod -a" twice to clean out the now-unused modules
> (e.g. sd_mod, scsi_mod, usb-storage)
> g) Trying to switch back to vc/2
> h) Oops!
> 
> 2.4.4 seems OK; I guess I'll have to build those -pre kernels now.

Interesting. See Pete's posting in thread about USB problems - it
may be related.

Re: Linux-2.4.5 and Reiserfs, oops!

[Chris Rankin]

I have now reproduced the lockup in 2.4.4, having passed the
additional boot parameters "nmi_watchdog=1 noapic".

To be more specific, it happens when switching from a vc running a
text console to the vc running X. I'm thinking that maybe the umount
NFS is a coincidence / red herring.

Chris

My video card is a Matrox G400 AGP 32MB with TV-OUT, and I'm not using
the frame buffer driver.

> On Sat, 26 May 2001, Chris Rankin wrote:
> 
> > Hi,
> > 
> > Thanks for the patch; I successfully unmounted my reiserfs USB Zip 250
> > MB disc. However, the box then locked up hard when I unmounted an NFS
> > mount and tried to switch to another virtual console.
> 
> That's... interesting. With that patch changes to fs/super.c should make
> no difference whatsoever.
> 
> OK, can you reproduce NFS lockup on 2.4.5-pre5 (without that patch)
> and on 2.4.5-pre3 (ditto)? 
> 
> There were NFS changes in -pre4 and -pre5 and umount ones in -pre6. The
> latter need the patch I've posted, so vanilla -pre5 and -pre3 are the
> first candidates for checking.
>