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+
+sh4: ghc randomly segfaults on qemu-sh4-static
+
+Hello!
+
+I am currently in the process of bootstrapping ghc for the Debian sh4 port and ran into a strange problem with qemu-sh4-static which randomly segfaults when running ghc to compile a Haskell source:
+
+root@jessie32:~/ghc-7.8.4/utils/ghc-pwd# ls
+Main.hi  Main.hs  Setup.hs  ghc-pwd.cabal  ghc.mk
+root@jessie32:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
+/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
+qemu: uncaught target signal 11 (Segmentation fault) - core dumped
+Segmentation fault
+root@jessie32:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
+/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
+qemu: uncaught target signal 11 (Segmentation fault) - core dumped
+Segmentation fault
+root@jessie32:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
+/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
+qemu: uncaught target signal 11 (Segmentation fault) - core dumped
+Segmentation fault
+root@jessie32:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
+/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
+qemu: uncaught target signal 11 (Segmentation fault) - core dumped
+Segmentation fault
+root@jessie32:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
+/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
+[1 of 1] Compiling Main             ( Main.hs, Main.o )
+qemu: uncaught target signal 11 (Segmentation fault) - core dumped
+Segmentation fault
+root@jessie32:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
+/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
+[1 of 1] Compiling Main             ( Main.hs, Main.o )
+qemu: uncaught target signal 11 (Segmentation fault) - core dumped
+Segmentation fault
+root@jessie32:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
+/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
+[1 of 1] Compiling Main             ( Main.hs, Main.o )
+Bad interface file: /usr/local/lib/sh4-unknown-linux-gnu-ghc-7.10.3/time/dist-install/build/Data/Time/Format/Parse.hi
+    ghc: panic! (the 'impossible' happened)
+  (GHC version 7.10.3 for sh4-unknown-linux):
+	getSymtabName:unknown known-key unique
+<<details unavailable>>
+
+Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
+
+root@jessie32:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
+/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
+[1 of 1] Compiling Main             ( Main.hs, Main.o )
+Linking Main ...
+root@jessie32:~/ghc-7.8.4/utils/ghc-pwd#
+
+As seen above, compiling a Haskell source code often results in a segfault but simply by retrying to run ghc over and over again, the compile process will eventually succeed and no segfault occurs.
+
+I have created a tarball which contains the sh4 chroot from the example above which also includes ghc, gcc and the source code in question (in /root/ghc-7.8.4/utils/ghc-pwd). To test, it's probably a good idea to replace the qemu-sh4-static binary in /usr/bin with a current git snapshot (which I tried but didn't help).
+
+> http://users.physik.fu-berlin.de/~glaubitz/sid-sh4-sbuild-ghc.tgz
+
+In case anyone wants to try ghc with their own sh4 chroot, here's my version of ghc:
+
+> https://people.debian.org/~glaubitz/sh4-unknown-linux-gnu-ghc-7.10.3.tar.gz
+
+Just extract in the chroot of the sh4 chroot.
+
+Please note, that it might be advisable on sh4 to apply the patches from these two bug reports as otherwise qemu-sh4-static won't work properly on sh4 and misses syscall 186:
+
+> https://bugs.launchpad.net/ubuntu/+source/qemu-linaro/+bug/1254824
+> https://bugs.launchpad.net/qemu/+bug/1516408
+
+The above issue is reproducible with the two patches applied and without. It's also reproducible with both libc6 2.19 and 2.21 in the chroot. Thus, I am currently out of ideas what else to test.
+
+Cheers,
+Adrian
+
+Thank you for the 611 MB tar....
+
+The behavior is a little bit different on my system:
+
+root@Quad:~# ls
+ghc-7.8.4			  ghc_7.8.4-9~bpo8+1.dsc
+ghc_7.8.4-9~bpo8+1.debian.tar.xz  ghc_7.8.4.orig.tar.xz
+root@Quad:~# cd ghc-7.8.4/utils/ghc-p
+ghc-pkg/ ghc-pwd/ 
+root@Quad:~# cd ghc-7.8.4/utils/ghc-p
+ghc-pkg/ ghc-pwd/ 
+root@Quad:~# cd ghc-7.8.4/utils/ghc-pwd/
+root@Quad:~/ghc-7.8.4/utils/ghc-pwd# ls
+Main  Main.hi  Main.hs	Main.o	Setup.hs  ghc-pwd.cabal  ghc.mk
+root@Quad:~/ghc-7.8.4/utils/ghc-pwd# ghc Main
+Main     Main.hi  Main.hs  Main.o   
+root@Quad:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
+root@Quad:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
+root@Quad:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
+root@Quad:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
+root@Quad:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
+root@Quad:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
+ghc: pthread_mutex_lock.c:80: __pthread_mutex_lock: Assertion `mutex->__data.__owner == 0' failed.
+qemu: uncaught target signal 6 (Aborted) - core dumped
+Aborted (core dumped)
+
+The emulated "tas.b" instruction is not atomic, this is why sometimes the locking fails...
+
+
+Interestingly, cmake also seems to crash in a similar way:
+
+- Log: https://buildd.debian.org/status/fetch.php?pkg=apt-cacher-ng&arch=sh4&ver=0.8.8-1&stamp=1450985460
+- Log: https://buildd.debian.org/status/fetch.php?pkg=texworks&arch=sh4&ver=0.5~svn1363-6%2Bb1&stamp=1450992669
+- Log: https://buildd.debian.org/status/fetch.php?pkg=x265&arch=sh4&ver=1.8-6&stamp=1450995672
+- Log: https://buildd.debian.org/status/fetch.php?pkg=libwebsockets&arch=sh4&ver=1.6.0-2&stamp=1450997039
+
+Maybe those are related?
+
+Just tested with the latest git snapshot of qemu, still no improvement:
+
+...
+checking for gfind... no
+checking for find... /usr/bin/find
+checking for sort... /usr/bin/sort
+checking for GHC Git commit id... given 4986837f8168cacf95c24fecc84d7b36c47f3c11
+checking version of ghc... 8.0.1
+ghc: pthread_mutex_lock.c:81: __pthread_mutex_lock: Assertion `mutex->__data.__owner == 0' failed.
+qemu: uncaught target signal 6 (Aborted) - core dumped
+ghc: pthread_mutex_lock.c:81: __pthread_mutex_lock: Assertion `mutex->__data.__owner == 0' failed.
+qemu: uncaught target signal 6 (Aborted) - core dumped
+ghc: pthread_mutex_lock.c:81: __pthread_mutex_lock: Assertion `mutex->__data.__owner == 0' failed.
+qemu: uncaught target signal 6 (Aborted) - core dumped
+Bootstrapping GHC is a cross compiler. This probably isn't going to work
+checking build system type... sh4-unknown-linux-gnu
+checking host system type... sh4-unknown-linux-gnu
+checking target system type... sh4-unknown-linux-gnu
+Build platform inferred as: sh4-unknown-linux
+Host platform inferred as: sh4-unknown-linux
+Target platform inferred as: sh4-unknown-linux
+GHC build  : sh4-unknown-linux
+GHC host   : sh4-unknown-linux
+GHC target : sh4-unknown-linux
+configure: Building in-tree ghc-pwd
+(hangs here)
+
+The QEMU project is currently considering to move its bug tracking to
+another system. For this we need to know which bugs are still valid
+and which could be closed already. Thus we are setting older bugs to
+"Incomplete" now.
+
+If you still think this bug report here is valid, then please switch
+the state back to "New" within the next 60 days, otherwise this report
+will be marked as "Expired". Or please mark it as "Fix Released" if
+the problem has been solved with a newer version of QEMU already.
+
+Thank you and sorry for the inconvenience.
+
+
+[Expired for QEMU because there has been no activity for 60 days.]
+