kern/101926: FBSD 6.1-STABLE crashes under heavy disk (ar0) I/O and
acces to USB device
ohartman at mail.uni-mainz.de
Sat Aug 12 16:10:13 UTC 2006
>Synopsis: FBSD 6.1-STABLE crashes under heavy disk (ar0) I/O and acces to USB device
>Arrival-Date: Sat Aug 12 16:10:11 GMT 2006
>Originator: O. Hartmann
>Release: FreeBSD 6.1-STABLE/AMD64
FreeBSD XXX.XXX.XXX.org 6.1-STABLE FreeBSD 6.1-STABLE #27: Sat Aug 12 14:03:42 UTC 2006 root at XXX.XXX.XXX.org:/usr/obj/usr/src/sys/THOR amd64
FreeBSD 6.1-STABLE/AMD64 crashes sporadically under heavy disk I/O when accessing USB device (simply mounting is enough to crash the box). This behaviour has now been watched in several situations on an AMD64 based box, when doing a lot of disk I/O due to torrent sharing or just doing a filesystem check after a crash: box crashes without message when just mounting an USB backup harddrive or after mounting this USB HD and doing then a lot of disk I/O both on the USB device and the main RAID 0 (ar0) of the box.
It is also very suspicious that doing a lot of disk I/O slows the box down just to be unusuable, reacting very, very slow. This occured after swapping the 'old' SATA disks to new Hitachi T7K250 SATA II HDs.
Do a lot of disk I/O and then just try to mount an USB HD and do disk I/O to this USB HD while box is still under heavy load. It may lead you into a crash.
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