Bug 87772

Summary: halt script segfaults during forced unmounting
Product: [Retired] Red Hat Linux Reporter: Hiroshi Iwatani <hga03630>
Component: util-linuxAssignee: Elliot Lee <sopwith>
Status: CLOSED WORKSFORME QA Contact: Ben Levenson <benl>
Severity: medium Docs Contact:
Priority: medium    
Version: 8.0   
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Hardware: i686   
OS: Linux   
URL: N/A
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2004-08-20 17:38:31 UTC Type: ---
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Description Hiroshi Iwatani 2003-04-02 09:53:26 UTC
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Description of problem:
The reboot/halt process reports a segfault at the /etc/init.d/halt
script line 168 when the user of an unmounted filesystem is
'kernel'. Then, the reboot/halt process hangs indefinitely. We
have no choice but resetting the machine. We believe this might
be caused from the fuser -k -m command at the line 164 of the
script because the command would have killed the 'kernel' process!?
Or, has he entered an infinite loop at the line 154-168?

Version-Release number of selected component (if applicable):
6.95-1

How reproducible:
Always

Steps to Reproduce:
1.Make the remaining user of an unmounted filesystem the 'kernel' process (I
don't know how to do it!).
2.Reboot or halt.
3.
    

Actual Results:  The reboot/halt process indefinitely hangs after reporting a
segfault
at the line 168 of the halt script.


Expected Results:  That the reboot/halt process be normally executed till their
ends.

Additional info:

Sometimes mounted filesystem can't be unmounted because the
umount reports Device Busy and the fuser reports that
current only remaining user of the filesystem is kernel.
I don't know why and how this could happen. If the ramaining
user is the kernel, above phenomenon occurs. This shoud be
a fatal error on the part of the init script.

Comment 1 Bill Nottingham 2003-09-04 01:21:13 UTC
This sounds like mount/umount segfaulting.

Comment 2 Elliot Lee 2003-09-05 17:59:18 UTC
Maybe one filesystem is mounted in a subdirectory of another mounted filesystem, or 
maybe the filesystem is NFS exported.

I need more information on reproducing this problem - anything you can provide would be 
helpful.