[Bug testsuite/29726] [gdb] FAIL: gdb.server/connect-with-no-symbol-file.exp: sysroot=: action=delete: connection to GDBserver succeeded

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29726

--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
I tried to reproduce using:
...
$ git diff
diff --git a/gdb/testsuite/gdb.server/connect-with-no-symbol-file.exp
b/gdb/testsuite/gdb.s
erver/connect-with-no-symbol-file.exp
index d45e958a529..d3e9f96f46a 100644
--- a/gdb/testsuite/gdb.server/connect-with-no-symbol-file.exp
+++ b/gdb/testsuite/gdb.server/connect-with-no-symbol-file.exp
@@ -93,12 +93,17 @@ proc connect_no_symbol_file { sysroot action } {
 # Make sure we have the original symbol file in a safe place to copy from.
 gdb_remote_download host $binfile $binfile.bak

-# Start with no executable loaded.
-clean_restart
-
-# Run the test with different permutations.
-foreach_with_prefix sysroot {"" "target:"} {
-    foreach_with_prefix action {"permission" "delete"} {
-       connect_no_symbol_file $sysroot $action
+set n 1000
+for {set i 1} {$i <= $n} {incr i} {
+    # Start with no executable loaded.
+    clean_restart
+
+    with_test_prefix $i {
+       # Run the test with different permutations.
+       foreach_with_prefix sysroot {"" "target:"} {
+           foreach_with_prefix action {"permission" "delete"} {
+               connect_no_symbol_file $sysroot $action
+           }
+       }
     }
 }
...
but that runs into a hang after ~200 iterations:
...
builtin_spawn
/home/vries/gdb_versions/devel/build/gdb/testsuite/../../gdb/../gdbserver/gdbserver
--once localhost:3151
/home/vries/gdb_versions/devel/build/gdb/testsuite/outputs/gdb.server/connect-with-no-symbol-file/connect-with-no-symbol-file^M
spawn of
/home/vries/gdb_versions/devel/build/gdb/testsuite/../../gdb/../gdbserver/gdbserver
--once localhost:3151
/home/vries/gdb_versions/devel/build/gdb/testsuite/outputs/gdb.server/connect-with-no-symbol-file/connect-with-no-symbol-file
failed
ERROR: tcl error sourcing
/home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.server/connect-with-no-symbol-file.exp.
ERROR: Timeout waiting for gdbserver response.
...

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