tests: Add gem_fd_exhaustion

Exhausts the system limit on open files and then tries to create
a new shmem-backed gem object. Linus Torvalds reported that this
blows up on a null obj->base.filp, but I can't reproduce this here:

http://lists.freedesktop.org/archives/intel-gfx/2014-January/038433.html

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/tests/.gitignore b/tests/.gitignore
index 1e52c2f..7377275 100644 (file)
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -35,6 +35,7 @@ gem_exec_blt
 gem_exec_faulting_reloc
 gem_exec_lut_handle
 gem_exec_nop
+gem_fd_exhaustion
 gem_fenced_exec_thrash
 gem_fence_thrash
 gem_flink

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 74ea1b5..a8c0c96 100644 (file)
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -85,6 +85,7 @@ TESTS_progs = \
        gem_exec_big \
        gem_exec_blt \
        gem_exec_lut_handle \
+       gem_fd_exhaustion \
        gem_gtt_cpu_tlb \
        gem_gtt_hog \
        gem_gtt_speed \

diff --git a/tests/gem_fd_exhaustion.c b/tests/gem_fd_exhaustion.c
new file mode 100644 (file)
index 0000000..77faff2
--- /dev/null
+++ b/tests/gem_fd_exhaustion.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Daniel Vetter <daniel.vetter@ffwll.ch>
+ *
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/resource.h>
+#include <sys/time.h>
+#include <fcntl.h>
+#include <limits.h>
+#include "drmtest.h"
+
+
+#define FD_ARR_SZ 100
+int fd_arr[FD_ARR_SZ];
+
+igt_simple_main
+{
+       int fd, i;
+       struct rlimit rlim;
+       unsigned nofile_rlim;
+       FILE *file_max = fopen("/proc/sys/fs/file-max", "r");
+       igt_assert(fscanf(file_max, "%u", &nofile_rlim) == 1);
+       fclose(file_max);
+
+       printf("System limit for open files is %u\n", nofile_rlim);
+
+       igt_assert(getrlimit(RLIMIT_NOFILE, &rlim) == 0);
+       rlim.rlim_cur = nofile_rlim;
+       rlim.rlim_max = nofile_rlim;
+       igt_assert(setrlimit(RLIMIT_NOFILE, &rlim) == 0);
+
+       fd = drm_open_any();
+
+       igt_assert(open("/dev/null", O_RDONLY) >= 0);
+
+       for (i = 0; ; i++) {
+               int tmp_fd = open("/dev/null", O_RDONLY);
+               uint32_t handle;
+
+               if (tmp_fd >= 0 && i < FD_ARR_SZ)
+                       fd_arr[i] = tmp_fd;
+
+               handle = gem_create(fd, 4096);
+               if (handle)
+                       gem_close(fd, handle);
+
+
+               if (!handle || tmp_fd < 0) {
+                       printf("fd exhaustion after %i rounds.\n", i);
+                       break;
+               }
+       }
+
+       /* free a few fd so that the exit handlers can at least run. */
+       for (i = 0; i < FD_ARR_SZ; i++)
+               close(fd_arr[i]);
+
+       close(fd);
+}