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[bug #29953] libdiskfs: multiple calls to diskfs_release_peropen with mu


From: Sergio López
Subject: [bug #29953] libdiskfs: multiple calls to diskfs_release_peropen with mutex already hold
Date: Mon, 24 May 2010 08:57:07 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US) AppleWebKit/532.5 (KHTML, like Gecko) Chrome/4.0.249.30 Safari/532.5

URL:
  <http://savannah.gnu.org/bugs/?29953>

                 Summary: libdiskfs: multiple calls to diskfs_release_peropen
with mutex already hold
                 Project: The GNU Hurd
            Submitted by: k0ro
            Submitted on: Mon 24 May 2010 10:57:06 AM CEST
                Category: Hurd Interfaces
                Severity: 4 - Important
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
         Reproducibility: Every Time
              Size (loc): None
         Planned Release: None
                  Effort: 0.00
Wiki-like text discussion box: 

    _______________________________________________________

Details:

diskfs_release_peropen is called as part of a cleanup operation if
diskfs_create_protid returns an error. This function tries to lock the mutex
of the node related to the peropen structure.

At multiple places in libdiskfs, this call is made with this mutex already
hold, so the current thread (and every other thread that tries to operate with
that node) is blocked forever.

This behaviour is pretty uncommon as diskfs_create_protid only fails in case
that all ports available to the current task have been consumed.




    _______________________________________________________

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  <http://savannah.gnu.org/bugs/?29953>

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