#15136: High CPU when asynchronous exception and unblocking retry on TVar raced -------------------------------------+------------------------------------- Reporter: nshimaza | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.6.1 Component: Runtime System | Version: 8.4.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Runtime crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): Thanks for the small repro! Indeed I am able to easily reproduce this. The racing threads look like this, {{{ Thread 8 (LWP 25960): #0 0x000000000049c0df in stmCommitTransaction () #1 0x00000000004a9de4 in stg_atomically_frame_info () #2 0x0000000000000000 in ?? () Thread 1 (LWP 25948): #0 0x000000000049b290 in lock_tvar () #1 0x000000000049b559 in remove_watch_queue_entries_for_trec () #2 0x000000000049b95b in stmAbortTransaction () #3 0x000000000049984c in raiseAsync () #4 0x0000000000499ba3 in throwToMsg () #5 0x0000000000499e82 in throwTo () #6 0x00000000004a6aac in stg_killThreadzh () #7 0x0000000000000000 in ?? () }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15136#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler