#2161: finaliser of a ForeignPtr called while references from unreachable threads exist ------------------------------------------+--------------------------------- Reporter: agl | Owner: Type: bug | Status: closed Priority: low | Milestone: 7.6.2 Component: Runtime System | Version: 6.8.2 Resolution: duplicate | Keywords: Os: Unknown/Multiple | Architecture: Unknown/Multiple Failure: Incorrect result at runtime | Difficulty: Unknown Testcase: | Blockedby: Blocking: | Related: ------------------------------------------+--------------------------------- Comment(by marlowsd@…): commit 1ae72ac45e51e63cbf6f3d627d77acc6a36aa0f9 {{{ Author: Simon Marlow Date: Tue Jul 2 12:10:53 2013 +0100 Fix #7970, #2161, unfix #551 Establish the reachability of threads before weak pointers. Hence a deadlocked thread can keep a weak pointer alive and prevent it from being finalized early. However, an reference from the finalizer of a weak pointer will no longer prevent a thread from being considered deadlocked (#551). To keep the thread alive in that situation you need to use a StablePtr. See comments on #7970 and in the code for more details. rts/sm/MarkWeak.c | 100 +++++++++++++++++++++++++++------------------------- 1 files changed, 52 insertions(+), 48 deletions(-) }}} -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/2161#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler