This is the mail archive of the mailing list for the glibc project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

[Bug nscd/13594] Crash if nscd is not running in __nscd_get_mapping

law at redhat dot com changed:

           What    |Removed                     |Added
                 CC|                            |law at redhat dot com

--- Comment #7 from law at redhat dot com 2012-03-27 18:19:34 UTC ---
Based on just reading the code, I wonder if a one thread is mucking up
hst_map_handle.mapped behind the back of nscd_get_mapping.

nscd_get_nl_timestamp doesn't bother to grab the hst_map_handle lock and calls
into nscd_get_mapping which could potentially change hst_map_handle.mapped to

If this occurs after another thread had passed the NO_MAPPING check in
nscd_get_map_ref, but hasn't yet hit the atomic_decrement_val in
nscd_get_mapping then it could cause the failure mode reported in this report
(and several others across various distros, upstream kde and possibly

That would also explain why the patch in c#2 works as well as the lack of

Vladimir/Paulo: I don't have a way to reproduce the problem here, but I could
pass along a patch to y'all if you're interested in testing my theory.

Configure bugmail:
------- You are receiving this mail because: -------
You are on the CC list for the bug.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]