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Date: Sun, 18 Feb 1996 00:57:37 GMT
From: dwmalone@maths.tcd.ie
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Subject: kern/1031: mount can panic system.
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>Number:         1031
>Category:       kern
>Synopsis:       mount can panic system.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Feb 17 17:00:01 PST 1996
>Last-Modified:
>Originator:     David Malone
>Organization:
School of Mathematics, Trinity College, Dublin, Ireland.
>Release:        FreeBSD 2.1-STABLE i386
>Environment:

FreeBSD 2.1, I've tried the stale version and an earlier snapshot.

>Description:

Bad command line arguments to mount will either cause processes to
hang in the kernel or panic the machine. This seems to happen whenever
the device and the directory for the mount point are the same.
The panic says:

ufs_lock: recursive lock not eexpected, pid: whatever

>How-To-Repeat:

This panics our 2.1.0-RELEASE and 2.1.0-951020-SNAP system:

mount /etc /etc

As a normal user you can try :

mkdir /tmp/x
mount -t msdos /tmp/x /tmp/x

This paniced my 2.1.0-951020-SNAP.


>Fix:
	
Be more carefull with what arguements you give mount ?
>Audit-Trail:
>Unformatted: