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User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040115

Description of problem:

Running mkisofs, with option '-h' results in a machine hang.

Input and can be either from NFS or local disk.  Input has
to be at least abt. 50 MB large.  Typically, when 95 to 99% 
is done (as says the -v option), the program stalls, and 
consumes 100% CPU.  No extra memory seems to be consumed.
A few seconds later, the machine grinds to a halt completely.
No swapping noise, no disk io.

It does not happen always, but definitely more than 90% of the
time.  Without option '-h', all works perfectly.

An strace reported a 'munmap' as the last syscall.



Version-Release number of selected component (if applicable):
kernel-smp-2.6.5-1.358 and mkisofs-2.01-0.a27.3

How reproducible:
Sometimes

Steps to Reproduce:
1. Choose a directory tree with abt. 50 MB or more.
2. mkisofs -v -h -o rubbish.iso <this_directory_tree>
3. Wait for 95% finished.
4. Hang...
    

Actual Results:  
The machine uses 100% CPU (Which I could see running it on an SMP).
This lasts for a short time (seconds).  Then there's a complete freeze.

Expected Results:  
Mkisofs should have exited normally.  Or if need be crash.  But should
never trigger a machine hang.

Additional info: