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MDEV-9733 Server crashes in lf_pinbox_real_free on replication slaves

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don't allocate all the stack, leave some stack for
function calls.

To test I added the following line:
  alloca_size = available_stack_size() - X
at X=4096 or less mysqld crashed, at 8192 mtr test passed.
This commit is contained in:
Sergei Golubchik 2016-03-17 21:29:52 +01:00
parent 0b9fb9aea9
commit fc2c1e4385
1 changed files with 8 additions and 1 deletions
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9
mysys/lf_alloc-pin.c
View file

@ -103,6 +103,12 @@
#include <my_sys.h>
#include <lf.h>
/*
when using alloca() leave at least that many bytes of the stack -
for functions we might be calling from within this stack frame
*/
#define ALLOCA_SAFETY_MARGIN 8192
#define LF_PINBOX_MAX_PINS 65536
static void _lf_pinbox_real_free(LF_PINS *pins);
@ -349,7 +355,8 @@ static void _lf_pinbox_real_free(LF_PINS *pins)
{
int alloca_size= sizeof(void *)*LF_PINBOX_PINS*npins;
/* create a sorted list of pinned addresses, to speed up searches */
if (available_stack_size(&pinbox, *pins->stack_ends_here) > alloca_size)
if (available_stack_size(&pinbox, *pins->stack_ends_here) >
alloca_size + ALLOCA_SAFETY_MARGIN)
{
struct st_harvester hv;
addr= (void **) alloca(alloca_size);