diff --git a/src/lib/core/fiber.c b/src/lib/core/fiber.c
index ee478f336f18dbdacf131ce7c63dc271876c65d0..f6ff1aaa7bb8eadc98417200d43a8adb492227e5 100644
--- a/src/lib/core/fiber.c
+++ b/src/lib/core/fiber.c
@@ -1309,6 +1309,14 @@ fiber_stack_destroy(struct fiber *fiber, struct slab_cache *slabc)
 			 */
 			say_syserror("fiber: Can't put guard page to slab. "
 				     "Leak %zu bytes", (size_t)fiber->stack_size);
+			/*
+			 * Suppress memory leak report for this object.
+			 *
+			 * Works even though it is not a beginning of
+			 * allocation (there is ASAN slab cache allocation
+			 * header).
+			 */
+			LSAN_IGNORE_OBJECT(fiber->stack_slab);
 		} else {
 			slab_put(slabc, fiber->stack_slab);
 		}
diff --git a/src/trivia/util.h b/src/trivia/util.h
index bf4f04e60bc36f757ec275cf93641498feac6a3b..2bf13c181ba8534c8069e0f2cf0062cbd2022da8 100644
--- a/src/trivia/util.h
+++ b/src/trivia/util.h
@@ -827,6 +827,13 @@ illegal_instruction(void)
 }
 #endif
 
+#ifdef ENABLE_ASAN
+# include <sanitizer/lsan_interface.h>
+# define LSAN_IGNORE_OBJECT(ptr) __lsan_ignore_object(ptr)
+#else
+# define LSAN_IGNORE_OBJECT(ptr) ((void)ptr)
+#endif
+
 #if defined(__cplusplus)
 } /* extern "C" */
 #endif /* defined(__cplusplus) */
diff --git a/test/unit/fiber_stack.c b/test/unit/fiber_stack.c
index 462540762c49f1244ae7e9d6fa1aced4c8fb2bd3..9cd9b5319920ccbf7c1050e3654bd5d1c386ba02 100644
--- a/test/unit/fiber_stack.c
+++ b/test/unit/fiber_stack.c
@@ -44,10 +44,6 @@ main_f(va_list ap)
 	 * gh-9026. Stack size crafted to be close to 64k so we should
 	 * hit red zone around stack when writing watermark if bug is not
 	 * fixed.
-	 *
-	 * The test is placed at the beginning because stderr is redirected
-	 * to /dev/null at the end of the test and ASAN diagnostic will
-	 * not be visible if the test will be placed at the end.
 	 */
 	fiber_attr = fiber_attr_new();
 	fiber_attr_setstacksize(fiber_attr, (64 << 10) - 128);
@@ -130,17 +126,9 @@ main_f(va_list ap)
 	inj = errinj(ERRINJ_FIBER_MPROTECT, ERRINJ_INT);
 	inj->iparam = PROT_READ | PROT_WRITE;
 
-	/* On fiber_mprotect() fail we are logging number of bytes to be
-	 * leaked. However, it depends on system page_size (_SC_PAGESIZE).
-	 * On different OS's this parameter may vary. So let's temporary
-	 * redirect stderr to dev/null to make this test stable regardless
-	 * of OS.
-	 */
-	freopen("/dev/null", "w", stderr);
 	fiber_start(fiber);
 	fiber_join(fiber);
 	inj->iparam = -1;
-	freopen("/dev/stderr", "w", stderr);
 
 	used_after = slabc->allocated.stats.used;
 	ok(used_after > used_before, "expected leak detected");