[dpdk-dev] [PATCH]librte_eal:add heap lock in malloc_heap_get_stats

["liucheng (J)" <liucheng11@huawei.com>]

There is no lock in function malloc_heap_get_stats. When we call this function, the elem may free by other thread.

the call stack:
Core was generated by `ovs-vswitchd unix:/usr/var/run/openvswitch/db.sock -vconsole:emer -vsyslog:info'.
Program terminated with signal 11, Segmentation fault.
#0  malloc_heap_get_stats (heap=0x7f3abf08ee1c, socket_stats=socket_stats@entry=0x7ffce811ffc0) at /usr/src/debug/dpdk-16.04/lib/librte_eal/common/malloc_heap.c:198
198                              socket_stats->heap_freesz_bytes += elem->size;
(gdb) bt
#0  malloc_heap_get_stats (heap=0x7f3abf08ee1c, socket_stats=socket_stats@entry=0x7ffce811ffc0) at /usr/src/debug/dpdk-16.04/lib/librte_eal/common/malloc_heap.c:198
#1  0x00007f3abd6d6299 in rte_malloc_get_socket_stats (socket=socket@entry=0, socket_stats=socket_stats@entry=0x7ffce811ffc0) at /usr/src/debug/dpdk-16.04/lib/librte_eal/common/rte_malloc.c:214
......



lib/librte_eal/common/malloc_heap.c | 3 +++
lib/librte_eal/common/malloc_heap.h | 2 +-
2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/librte_eal/common/malloc_heap.c b/lib/librte_eal/common/malloc_heap.c
index 267a4c6..1952ddd 100644
--- a/lib/librte_eal/common/malloc_heap.c
+++ b/lib/librte_eal/common/malloc_heap.c
@@ -189,6 +189,7 @@ malloc_heap_get_stats(const struct malloc_heap *heap,
       socket_stats->heap_freesz_bytes = 0;
       socket_stats->greatest_free_size = 0;
+       rte_spinlock_lock(&heap->lock);
       /* Iterate through free list */
       for (idx = 0; idx < RTE_HEAP_NUM_FREELISTS; idx++) {
                for (elem = LIST_FIRST(&heap->free_head[idx]);
@@ -200,6 +201,8 @@ malloc_heap_get_stats(const struct malloc_heap *heap,
                                   socket_stats->greatest_free_size = elem->size;
                }
       }
+       rte_spinlock_unlock(&heap->lock);
+
       /* Get stats on overall heap and allocated memory on this heap */
       socket_stats->heap_totalsz_bytes = heap->total_size;
       socket_stats->heap_allocsz_bytes = (socket_stats->heap_totalsz_bytes -
diff --git a/lib/librte_eal/common/malloc_heap.h b/lib/librte_eal/common/malloc_heap.h
index 3ccbef0..3b1166f 100644
--- a/lib/librte_eal/common/malloc_heap.h
+++ b/lib/librte_eal/common/malloc_heap.h
@@ -57,7 +57,7 @@ malloc_heap_alloc(struct malloc_heap *heap,  const char *type, size_t size,
                unsigned flags, size_t align, size_t bound);
 int
-malloc_heap_get_stats(const struct malloc_heap *heap,
+malloc_heap_get_stats(struct malloc_heap *heap,
                struct rte_malloc_socket_stats *socket_stats);
 int