gentoo resync : 01.12.2017

1 files changed, 63 insertions, 0 deletions

diff --git a/dev-scheme/guile/files/guile-2.0.14-ia64-fix-crash-thread-context-switch.patch b/dev-scheme/guile/files/guile-2.0.14-ia64-fix-crash-thread-context-switch.patch
new file mode 100644
index 000000000000..c2f136ddd104
--- /dev/null
+++ b/dev-scheme/guile/files/guile-2.0.14-ia64-fix-crash-thread-context-switch.patch
@@ -0,0 +1,63 @@
+From f92888853439a8ded221f3423865c78de2a96a14 Mon Sep 17 00:00:00 2001
+From: Sergei Trofimovich <slyfox@gentoo.org>
+Date: Sun, 5 Nov 2017 09:30:45 +0000
+Subject: ia64: Fix crash in thread context switch.
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Fixes <https://bugs.gnu.org/29151> and <https://bugs.gentoo.org/613986>.
+
+Backtrace looks like that:
+
+  Program terminated with signal SIGSEGV, Segmentation fault.
+  #0  0x200000000014a5c0 in scm_ia64_longjmp (JB=0x6000000000817020, VAL=1) at continuations.c:372
+  372                   t->pending_rbs_continuation->backing_store,
+  [Current thread is 1 (Thread 0x2000000000049340 (LWP 8190))]
+  (gdb) bt
+  #0  0x200000000014a5c0 in scm_ia64_longjmp (JB=0x6000000000817020, VAL=1) at continuations.c:372
+  #1  0x2000000000148e00 in scm_c_abort (vm=0x60000000000edea0, tag=0x6000000000795ba0, n=0, argv=0x60000fffff7f0ce0, cookie=-1) at control.c:239
+  #2  0x2000000000149070 in scm_at_abort (tag=0x6000000000795ba0, args=0x304) at control.c:258
+  (gdb) print t
+  $2 = (scm_i_thread *) 0x6000000000068000
+  (gdb) print t->pending_rbs_continuation
+  $3 = (scm_t_contregs *) 0xffeb
+
+The problem here is the value of 't->pending_rbs_continuation' pointer.
+It's supposed to poin to a register stack pointer or be NULL if not yet
+backed up.
+
+The problem is it is never initialized to NULL at creation time and
+contained garbage on stack. Sometimes people are lucky and have zeros
+on stack and guile works. But sometimes there is something and guile
+crashes.
+
+The fix is trivial: initialize 'pending_rbs_continuation = NULL'
+at thread registration time (the same way other threads are registered).
+
+Reported-by: Matt Turner
+
+* libguile/threads.c (guilify_self_1): Initialize pending_rbs_continuation
+to avoid crash on ia64.
+
+Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
+Signed-off-by: Ludovic Courtès <ludo@gnu.org>
+---
+ libguile/threads.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/libguile/threads.c b/libguile/threads.c
+index 9ceb5b8..770f62c 100644
+--- a/libguile/threads.c
++++ b/libguile/threads.c
+@@ -395,6 +395,7 @@ guilify_self_1 (struct GC_stack_base *base, int needs_unregister)
+   t.base = base->mem_base;
+ #ifdef __ia64__
+   t.register_backing_store_base = base->reg_base;
++  t.pending_rbs_continuation = 0;
+ #endif
+   t.continuation_root = SCM_EOL;
+   t.continuation_base = t.base;
+-- 
+cgit v1.0-41-gc330
+