On Fri, Jun 15, 2007 at 11:00:04PM +0930, Benjamin Close wrote: > 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? Enable DEBUG_VFS_LOCKS and DEBUG_LOCKS, then break to DDB when the deadlock occurs and do 'show lockedvnods'. Kris
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