NOT !! Re: (reiserfs) 2.3.99-pre9-5 fixed deadlocks with ReiserFS

From: Cyrille Chepelov (home) (
Date: Wed May 24 2000 - 17:02:09 EST

On Tue, 23 May 2000, Matt Yourst wrote:

> As you may know, there were some deadlock problems with ReiserFS 3.6.5 and
> kernel >= 2.3.99-pre7-4. I submitted a patch for this problem earlier but it
> also broke the swap-out code in some other cases. Fortunately, whatever was
> originally causing the race condition with ReiserFS and writing out dirty mmaped
> pages now appears to be fixed as of 2.3.99-pre9-5. I have not stress-tested this
> prepatch though, so others might want to confirm this too.

The -pre9 + reiserfs 3.6.5 combo is still definitely *DANGEROUS*.
In particular, this breaks badly when you do a simple
        apt-get dist-upgrade
When that happens, apt gets locked. Calling top, ps, killall, or even
        ls -l /proc/<pid>
gives you a stuck, unkillable process.

strace points its fingers at sys_mlock(), but I don't know how reliable
this is.

This was still quite bearable. But there's worse. Once, I didn't reboot
after I stuck an apt-get (circa pre9-1), and worked with the machine. Next
reboot, bang ! My noffle database was clobbered... with copies of stuff
from /var/lib/dpkg/* (fortunately, it was not the other way around).

(currently, I've got only /var on reiserfs ; I had some plans to move the
other partitions (I've got a really bad pollen, acarians and e2fsck
allergy, the latter being absolutely not seasonal now) ; this will have to
wait for the 3.5.21 bugs to be squashed, I'm afraid was announced

Traces and tests (of new patches) welcome, on request.

        -- Cyrille


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