Bug#23251517: SEMISYNC REPLICATION HANGINGmysql-5.5.50

Revert following bug fix:

Bug#20685029: SLAVE IO THREAD SHOULD STOP WHEN DISK IS
FULL
Bug#21753696: MAKE SHOW SLAVE STATUS NON BLOCKING IF IO
THREAD WAITS FOR DISK SPACE

This fix results in a deadlock between slave IO thread
and SQL thread.

(cherry picked from commit e3fea6c6dbb36c6ab21c4ab777224560e9608b53)

2 files changed, 6 insertions, 16 deletions

diff --git a/mysys/errors.c b/mysys/errors.c
index b6064460535..a6e2e300a1f 100644
--- a/mysys/errors.c
+++ b/mysys/errors.c
@@ -15,7 +15,7 @@
 
 #include "mysys_priv.h"
 #include "mysys_err.h"
-#include "m_string.h"
+
 #ifndef SHARED_LIBRARY
 
 const char *globerrs[GLOBERRS]=
@@ -109,7 +109,6 @@ void init_glob_errs()
 */
 void wait_for_free_space(const char *filename, int errors)
 {
-  size_t time_to_sleep= MY_WAIT_FOR_USER_TO_FIX_PANIC;
   if (!(errors % MY_WAIT_GIVE_USER_A_MESSAGE))
   {
     my_printf_warning(EE(EE_DISK_FULL),
@@ -120,15 +119,10 @@ void wait_for_free_space(const char *filename, int errors)
   }
   DBUG_EXECUTE_IF("simulate_no_free_space_error",
                  {
-                   time_to_sleep= 1;
-                 });
-  DBUG_EXECUTE_IF("simulate_io_thd_wait_for_disk_space",
-                 {
-                   time_to_sleep= 1;
+                   (void) sleep(1);
+                   return;
                  });
-
-  (void) sleep(time_to_sleep);
-  DEBUG_SYNC_C("disk_full_reached");
+  (void) sleep(MY_WAIT_FOR_USER_TO_FIX_PANIC);
 }
 
 const char **get_global_errmsgs()
diff --git a/mysys/my_write.c b/mysys/my_write.c
index 2e68a4dcff3..f092420756e 100644
--- a/mysys/my_write.c
+++ b/mysys/my_write.c
@@ -24,7 +24,6 @@ size_t my_write(File Filedes, const uchar *Buffer, size_t Count, myf MyFlags)
 {
   size_t writtenbytes, written;
   uint errors;
-  size_t ToWriteCount;
   DBUG_ENTER("my_write");
   DBUG_PRINT("my",("fd: %d  Buffer: %p  Count: %lu  MyFlags: %d",
 		   Filedes, Buffer, (ulong) Count, MyFlags));
@@ -38,14 +37,11 @@ size_t my_write(File Filedes, const uchar *Buffer, size_t Count, myf MyFlags)
                    { DBUG_SET("+d,simulate_file_write_error");});
   for (;;)
   {
-    ToWriteCount= Count;
-    DBUG_EXECUTE_IF("simulate_io_thd_wait_for_disk_space", { ToWriteCount= 1; });
 #ifdef _WIN32
-    writtenbytes= my_win_write(Filedes, Buffer, ToWriteCount);
+    writtenbytes= my_win_write(Filedes, Buffer, Count);
 #else
-    writtenbytes= write(Filedes, Buffer, ToWriteCount);
+    writtenbytes= write(Filedes, Buffer, Count);
 #endif
-    DBUG_EXECUTE_IF("simulate_io_thd_wait_for_disk_space", { errno= ENOSPC; });
     DBUG_EXECUTE_IF("simulate_file_write_error",
                     {
                       errno= ENOSPC;