Swapfile on ZFS & Deadlock

From: Benjamin Close <Benjamin.Close_at_clearchain.com>
Date: Fri, 15 Jun 2007 23:00:04 +0930
Hi All,
    Whilst running out of memory compiling Xorg (scanPCI is a killer) I 
discovered a quick way to deadlock the system:

dd if=/dev/zero of=somefileonzfs bs=something count=something
mdconfig -a -f something
swapon /dev/md0

Then do something that needs swap.. instant deadlock. The system is 
still responsive but all disk access become hung.

Known issue? If so is there a way we can warn users/prevent users from 
doing it?

Cheers,
    Benjamin
Received on Fri Jun 15 2007 - 11:30:30 UTC

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