[haiku-bugs] Re: [Haiku] #5138: PANIC: remove page 0x82868278 from cache 0xd19e7680: page still has mappings!
- From: "bonefish" <trac@xxxxxxxxxxxx>
- Date: Wed, 20 Jan 2010 09:18:17 -0000
#5138: PANIC: remove page 0x82868278 from cache 0xd19e7680: page still has
mappings!
---------------------------+------------------------------------------------
Reporter: mmadia | Owner: bonefish
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: System/Kernel | Version: R1/Development
Keywords: | Blockedby:
Platform: All | Blocking: 5216
---------------------------+------------------------------------------------
Comment(by bonefish):
Probably fixed in r35195.
Fortunately today an ASSERT() I introduced a few days ago was triggered
while running a Haiku build. It showed the race condition due to the now
fixed missing locking in action. The pages of the kernel stack for a new
userland thread were just being incorrectly mapped into a heap area. After
continuing I got the "page has still mappings" panic() in the undertaker.
Since a page in that area was not mapped correctly its wired_count
wouldn't be decremented, thus leading to the panic().
Matt, please give the new revision a whirl with a configuration likely to
reproduce the bug (i.e. no tracing) and close the ticket, if you can't
reproduce it anymore.
--
Ticket URL: <http://dev.haiku-os.org/ticket/5138#comment:26>
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