#8275: Loopification breaks profiling ----------------------------------------+---------------------------------- Reporter: jstolarek | Owner: jstolarek Type: bug | Status: new Priority: highest | Milestone: Component: Profiling | Version: 7.7 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Building GHC failed | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: 8298 | Blocked By: | Related Tickets: ----------------------------------------+---------------------------------- Comment (by ezyang): {{{ Program received signal SIGSEGV, Segmentation fault. 0x000000000509dced in enterFunCCS (reg=0x64540d8, ccsfn=0x644496000) at rts/Profiling.c:367 367 if (ccsfn->prevStack == CCS_MAIN) { (gdb) bt #0 0x000000000509dced in enterFunCCS (reg=0x64540d8, ccsfn=0x644496000) at rts/Profiling.c:367 #1 0x000000000095ad66 in s47v_info () #2 0x0000000000000000 in ?? () }}} where `0x644496000` is nonsense memory. My guess is that the nodeReg isn't being restored properly upon the loop back. Some sample code which the loopification triggers on would be helpful for debugging; you will probably be able to figure it out by eyeballing the C--. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8275#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler