Bug#876440: haskell-http-link-header: workaround to fix FTBFS on ppc64el/ppc64/powerpc

[Frédéric Bonnard]

Package: src:haskell-http-link-header
Version: 1.0.3-3
Tags: patch pending
User: debian-powerpc at lists.debian.org
Usertags: ppc64el 

--

Dear maintainer,

I see that the package fails to build ppc64el (but also powerpc/ppc64).
Running the build several times, I see it can fails differently and
especially during the compilation, so not sure about this particular
package being the cause.
There are some traces in dmesg like :
[124845.158532] ghc_worker[37823]: unhandled signal 11 at 38426c883c4c03dc nip 38426c883c4c03dc lr 00003fff713ae134 code 30003
[125617.514575] ghc_worker[42842]: unhandled signal 11 at 0000000000000009 nip 00003fff79f3b7f0 lr 00003fff7211e134 code 30001
[125727.370133] ghc_worker[43624]: unhandled signal 11 at 5100003fffa5c2cc nip 5100003fffa5c2cc lr 00003fff9cdce134 code 30003
[126077.784174] ghc_worker[47413]: unhandled signal 11 at 0000000000000000 nip 00003fffa2fc8034 lr 00003fffa2fce134 code 30001
...
and looking at ghc's upstream, I see this bug opened :
https://ghc.haskell.org/trac/ghc/ticket/12537

On my side I can see :
$ gdb  /usr/lib/ghc/bin/ghc /tmp/core.ghc_worker.52783.forge.1506076822
...
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/powerpc64le-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/lib/ghc/bin/ghc -B/usr/lib/ghc --make -no-link -fbuilding-cabal-package -O'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x384264ac3c4c02e4 in ?? ()
[Current thread is 1 (Thread 0x3eff1f7ff1a0 (LWP 52814))]
(gdb) bt
#0  0x384264ac3c4c02e4 in ?? ()
#1  0x00003fff79a5e134 in stg_atomicModifyMutVarzh () from /usr/lib/ghc/bin/../rts/libHSrts_thr-ghc8.0.2.so
#2  0x00003fff79a2f424 in ?? () from /usr/lib/ghc/bin/../rts/libHSrts_thr-ghc8.0.2.so
#3  0x00003fff79a30ea8 in ?? () from /usr/lib/ghc/bin/../rts/libHSrts_thr-ghc8.0.2.so
#4  0x00003fff79a3eb64 in ?? () from /usr/lib/ghc/bin/../rts/libHSrts_thr-ghc8.0.2.so
#5  0x00003fff798e80dc in start_thread () from /lib/powerpc64le-linux-gnu/libpthread.so.0
#6  0x00003fff79681508 in clone () from /lib/powerpc64le-linux-gnu/libc.so.6

I don't know haskell at all, but as the above ticket mentioned problem
due to parallel build and atomic operations on Power, I think we have
a similar issue.
I tried forcing the build with -j1 which didn't break so far while
looping on the build of the package.
So here is a patch that can workaround that ghc issue on Power for now.

Regards.
F.
-------------- next part --------------
diff -Nru haskell-http-link-header-1.0.3/debian/changelog haskell-http-link-header-1.0.3/debian/changelog
--- haskell-http-link-header-1.0.3/debian/changelog	2017-07-20 22:03:40.000000000 +0200
+++ haskell-http-link-header-1.0.3/debian/changelog	2017-09-22 11:40:05.000000000 +0200
@@ -1,3 +1,11 @@
+haskell-http-link-header (1.0.3-3.1) unstable; urgency=medium
+
+  * Non-maintainer upload.
+  * debian/rules : disable parallel build on powerpc/ppc64el/ppc64 while
+    waiting for fix of https://ghc.haskell.org/trac/ghc/ticket/12537
+
+ -- Frédéric Bonnard <frediz at linux.vnet.ibm.com>  Fri, 22 Sep 2017 09:40:05 +0000
+
 haskell-http-link-header (1.0.3-3) unstable; urgency=medium
 
   * debian/patches/59c4bf5c8b2cffb7b293bbc034310914a6c3bd20.patch:
diff -Nru haskell-http-link-header-1.0.3/debian/rules haskell-http-link-header-1.0.3/debian/rules
--- haskell-http-link-header-1.0.3/debian/rules	2017-06-24 05:32:06.000000000 +0200
+++ haskell-http-link-header-1.0.3/debian/rules	2017-09-22 11:40:05.000000000 +0200
@@ -14,4 +14,10 @@
 # Dh_Haskell.sh, so just point it to a writable HOME for now.
 export HOME=$(CURDIR)/debian/cabalconfig
 
+# workaround to prevent some random failures on power while waiting for :
+# https://ghc.haskell.org/trac/ghc/ticket/12537
+ifneq (,$(findstring $(DEB_HOST_ARCH), powerpc ppc64 ppc64el))
+DEB_SETUP_GHC_CONFIGURE_ARGS += --ghc-options="-j1"
+endif
+
 check-ghc-stamp: export LC_ALL := C.UTF-8
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