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[RFC/PATCH] Extend gdb_core_cmd to allow "Cannot access memory..." messages


While hacking the coredump_filter patch, I noticed that, when you load a
corefile on GDB and receive a "Cannot access memory at address..."
message, gdb_core_cmd will fail and return -1, which means that some
fatal error happened.

Unfortunately, this kind of message does not mean that the user cannot
continue debugging with the corefile; it meant that some memory region
(sometimes not important) was inaccessible.  Given that
gcore_create_callback, nowadays, will dump memory regions if they don't
have the 'read' permission set (but have any other permission set), this
kind of error can be expected sometimes.

I would like to propose this patch to be applied, which will allow the
test to continue even if this message is triggered.  I was not sure
wether I should use a "pass" or "xfail" there, so I chose the second
(which makes more sense to me).


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2015-03-24  Sergio Durigan Junior  <>

	* lib/gdb.exp (gdb_core_cmd): Handle "Cannot access memory at
	address..." message.

diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index f274b64..48b50b5 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -3573,7 +3573,7 @@ proc gdb_gcore_cmd {core test} {
 # -1 - core file failed to load
 proc gdb_core_cmd { core test } {
-    global gdb_prompt
+    global gdb_prompt hex
     gdb_test_multiple "core $core" "$test" {
 	-re "\\\[Thread debugging using \[^ \r\n\]* enabled\\\]\r\n" {
@@ -3591,6 +3591,10 @@ proc gdb_core_cmd { core test } {
 	    fail "$test (incomplete note section)"
 	    return 0
+	-re "Cannot access memory at address $hex\r\n$gdb_prompt $" {
+	    pass "$test (could not access some memory regions)"
+	    return 0
+	}
 	-re "Core was generated by .*\r\n$gdb_prompt $" {
 	    pass "$test"
 	    return 1

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