Subject: kern/4333: Kernel hangs while trying to mount ffs partition
To: None <>
From: Paul Goyette <>
List: netbsd-bugs
Date: 10/24/1997 06:21:46
>Number:         4333
>Category:       kern
>Synopsis:       Kernel hangs while trying to mount ffs partition
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people (Kernel Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Oct 24 06:35:02 1997
>Originator:     Paul Goyette
>Release:        Tues 21 Oct
	Mac IIci, 80MB RAM, sd0 -> Toshiba MK538FB (1.2GB), sd1 -> DEC RZ74C
	(3.6GB), sd2 -> Syquest SQ3270S (270MB removable), st0 -> Exabyte
	8200 (scsi target 4), cd0 -> Toshiba XM3501TA (4x CD-ROM, scsi
	target 6)

	Kernel hangs when trying to mount partition on DEC RZ74C drive (sd1).
	Stack trace and single-stepping indicates that the code at
	_sys_mount + 360 is continuously generating a page fault;  the
	vm_fault() code gets executed, and exits, put the page fault appears
	not to be resolved.

	This problem only occurs on the one disk drive;  mounting partitions
	from the other drives (sd0 and sd2) consistently succeeds.

	Suspicion is that the recent changes to the scsipi code (in the
	area of error handling) may be inconsistent with this disk.  But
	previous code (as of 26 Sept 97) worked with all drives.
	Consistent hang whenever trying to mount any partition on the DEC
	RZ74 drive.