[Bug 1354114] Re: multipath segmentation Fault (libmultipath: update waiter handling)

[Rafael David Tinoco]

It looks like the fix above introduces regressions (actually other new
bugs):

commit 96f81469ff993b6063bb8829d9b336590510466d
Author: Hannes Reinecke <hare at suse.de>
Date:   Mon May 4 16:46:58 2009 +0200

    libmultipath: update waiter handling

    The current 'waiter' structure accesses fields which belong
    to the main 'mpp' structure, which has a totally different
    lifetime. With this patch most of these dependencies are
    removed and the 'waiter' structure can run independently
    of the main 'mpp' structure, reducing the risk of
    use-after-free faults.

    Signed-off-by: Hannes Reinecke <hare at suse.de>

Introduces this problem:

commit c301a3f09203edf91df5a9adf4e32ea2a7238cda
Author: Hannes Reinecke <hare at suse.de>
Date:   Wed May 25 14:40:19 2011 +0200

    Race condition when calling stop_waiter_thread()

    We cannot access the waiter structure from other threads as
    the lifetime is totally different and it might be deleted
    at any time.
    So we better store the pthread id in the calling thread and
    just send a signal to the thread.

    References: bnc#642846

    Signed-off-by: Hannes Reinecke <hare at suse.de>


** Patch removed: "utopic_multipath-tools_0.4.9-3ubuntu9.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/multipath-tools/+bug/1354114/+attachment/4172185/+files/utopic_multipath-tools_0.4.9-3ubuntu9.debdiff

** Patch removed: "trusty_multipath-tools_0.4.9-3ubuntu8.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/multipath-tools/+bug/1354114/+attachment/4172184/+files/trusty_multipath-tools_0.4.9-3ubuntu8.debdiff

** Patch removed: "precise_multipath-tools_0.4.9-3ubuntu5.2.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/multipath-tools/+bug/1354114/+attachment/4172183/+files/precise_multipath-tools_0.4.9-3ubuntu5.2.debdiff

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Title:
  multipath segmentation Fault (libmultipath: update waiter handling)

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