[Qemu-devel] [Bug 1527765] Re: sh4: ghc randomly segfaults on qemu-sh4-static

[Laurent Vivier]

Thank you for the 611 MB tar....

The behavior is a little bit different on my system:

address@hidden:~# 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
address@hidden:~# cd ghc-7.8.4/utils/ghc-p
ghc-pkg/ ghc-pwd/ 
address@hidden:~# cd ghc-7.8.4/utils/ghc-p
ghc-pkg/ ghc-pwd/ 
address@hidden:~# cd ghc-7.8.4/utils/ghc-pwd/
address@hidden:~/ghc-7.8.4/utils/ghc-pwd# ls
Main  Main.hi  Main.hs  Main.o  Setup.hs  ghc-pwd.cabal  ghc.mk
address@hidden:~/ghc-7.8.4/utils/ghc-pwd# ghc Main
Main     Main.hi  Main.hs  Main.o   
address@hidden:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
address@hidden:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
address@hidden:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
address@hidden:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
address@hidden:~/ghc-7.8.4/utils/ghc-pwd# ghc Main.hs
address@hidden:~/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...

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https://bugs.launchpad.net/bugs/1527765

Title:
  sh4: ghc randomly segfaults on qemu-sh4-static

Status in QEMU:
  New

Bug description:
  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:

  address@hidden:~/ghc-7.8.4/utils/ghc-pwd# ls
  Main.hi  Main.hs  Setup.hs  ghc-pwd.cabal  ghc.mk
  address@hidden:~/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
  address@hidden:~/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
  address@hidden:~/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
  address@hidden:~/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
  address@hidden:~/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
  address@hidden:~/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
  address@hidden:~/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

  address@hidden:~/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 ...
  address@hidden:~/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 this tarball into the root directory 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 amd64 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

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