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Sergei Trofimovich authored
rts/ThreadLabels.c has a global hashtable for each running haskell thread. It's not synchronized across OS threads. Was discovered when ran -debug build of ghc itself as: $ ghc-stage2 -j8 +RTS -A256M -l and glibc detected double-free corruption: #2 in __libc_message (do_abort=do_abort@entry=2, fmt=fmt@entry=0x7fe0bcebf368 "*** Error in `%s': %s: 0x%s ***\n") #3 in malloc_printerr (action=3, str=0x7fe0bcebf4c0 "double free or corruption (fasttop)", ptr=<optimized out>) #4 in _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) #5 in stgFree (p=0x7fe060001820) at rts/RtsUtils.c:108 #6 in freeHashTable (table=0x5929320, freeDataFun=0x36374df <stgFree>) at rts/Hash.c:360 #7 in freeThreadLabelTable () at rts/ThreadLabels.c:37 #8 in hs_exit_ (wait_foreign=rtsFalse) at rts/RtsStartup.c:403 #9 in shutdownHaskellAndExit (n=0, fastExit=0) at rts/RtsStartup.c:481 #10 in hs_main (...) at...
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