[haiku-bugs] Re: [Haiku] #8275: Deadlocking apps when opening documents
- From: "stippi" <trac@xxxxxxxxxxxx>
- Date: Sun, 04 Mar 2012 09:57:05 -0000
#8275: Deadlocking apps when opening documents
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Reporter: humdinger | Owner: pulkomandy
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: Kits/Locale Kit | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
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Comment (by stippi):
Here is my analysis of the problem. I was observing the same behavior and
searched Trac if this was already reported.
What happens is that StyledEdit has two threads threads running at the
point of the dead-lock, the file panel thread and it's BApplication
thread. During initializaton, the file panel thread wants to translate
some system file name. As can be seen in the stack trace,
MutableLocalRoster calls MakeSureItsLoaded() which in turn looks up an
image symbol. At this point, it has already grabbed the default locale
roster lock. Concurrently, the app is trying to load the text file. In
StyledEdit, this works via translators. As can be seen in the stack trace,
the BTranslationRoster is loading Translator add-ons. At some point, it
also deals with image and add-on functions (load_add_on()). Presumably, it
has at that point grabbed some lock, which the file panel thread also
wants to grab in the get_image() function. So this is a classic dead-lock
situation because of reversed locking order. One thread first grabs the
locale roster lock, then tries to grab an image related lock. The other
thread first grabs the image related lock, then tries to grab the locale
roster lock. Each thread is waiting for the other one to release the
respective lock.
I am just writing this down, since I don't know when I will have time to
look into it more. But the solution seems to be to either not hold the
locale roster lock when ''loading'' locale add-ons, or to make sure the
locking order is always the same.
--
Ticket URL: <http://dev.haiku-os.org/ticket/8275#comment:4>
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