merge revision(s) 56030,56035: [Backport #12711]

	* vm_dump.c (backtrace): use rip in the saved context for the case
	  the SIGSEGV is received when the process is in userland.
	  Note that ip in the stack should be used if the signal is received
	  when it is in kernel (when it is calling syscall) [Bug #12711]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@56308 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 15 insertions, 4 deletions

diff --git a/ChangeLog b/ChangeLog
index f8841f5e4e..044acfb822 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Sat Oct  1 00:57:54 2016  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* vm_dump.c (backtrace): use rip in the saved context for the case
+	  the SIGSEGV is received when the process is in userland.
+	  Note that ip in the stack should be used if the signal is received
+	  when it is in kernel (when it is calling syscall) [Bug #12711]
+
 Sat Oct  1 00:56:19 2016  Aaron Patterson <tenderlove@ruby-lang.org>
 
 	* lib/uri/generic.rb (def check_password): don't include bad password
diff --git a/version.h b/version.h
index 3e988431ad..56843a1a9f 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.2.6"
 #define RUBY_RELEASE_DATE "2016-10-01"
-#define RUBY_PATCHLEVEL 377
+#define RUBY_PATCHLEVEL 378
 
 #define RUBY_RELEASE_YEAR 2016
 #define RUBY_RELEASE_MONTH 10
diff --git a/vm_dump.c b/vm_dump.c
index b33936de96..155bb62d09 100644
--- a/vm_dump.c
+++ b/vm_dump.c
@@ -487,10 +487,14 @@ darwin_sigtramp:
 	unw_set_reg(&cursor, UNW_X86_64_R13, uctx->uc_mcontext->__ss.__r13);
 	unw_set_reg(&cursor, UNW_X86_64_R14, uctx->uc_mcontext->__ss.__r14);
 	unw_set_reg(&cursor, UNW_X86_64_R15, uctx->uc_mcontext->__ss.__r15);
-	ip = *(unw_word_t*)uctx->uc_mcontext->__ss.__rsp;
-	unw_set_reg(&cursor, UNW_REG_IP, ip);
-	trace[n++] = (void *)uctx->uc_mcontext->__ss.__rip;
+	ip = uctx->uc_mcontext->__ss.__rip;
+	if (((char*)ip)[-2] == 0x0f && ((char*)ip)[-1] == 5) {
+	    /* signal received in syscall */
+	    trace[n++] = (void *)ip;
+	    ip = *(unw_word_t*)uctx->uc_mcontext->__ss.__rsp;
+	}
 	trace[n++] = (void *)ip;
+	unw_set_reg(&cursor, UNW_REG_IP, ip);
     }
     while (unw_step(&cursor) > 0) {
 	unw_get_reg(&cursor, UNW_REG_IP, &ip);