Re: [GHC] #7970: Thread GC frees roots before thread actually finishes

#7970: Thread GC frees roots before thread actually finishes ---------------------------------+------------------------------------------ Reporter: joeyadams | Owner: simonmar Type: bug | Status: new Priority: high | Milestone: 7.8.1 Component: Runtime System | Version: 7.6.3 Keywords: | Os: Unknown/Multiple Architecture: Unknown/Multiple | Failure: Runtime crash Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: 7170 | ---------------------------------+------------------------------------------ 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/7970#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler