On Thu, Feb 04, 2021 at 03:58:33PM +0100, Christian König wrote: > ? > > What's the background here? > > Christian. > > Am 04.02.21 um 15:57 schrieb Gerd Hoffmann: > > kobject: '(null)' ((____ptrval____)): is not initialized, yet kobject_put() is being called. > > WARNING: CPU: 0 PID: 209 at lib/kobject.c:750 kobject_put+0x3a/0x60 > > [ ... ] > > Call Trace: > > ttm_device_fini+0x133/0x1b0 [ttm] > > qxl_ttm_fini+0x2f/0x40 [qxl] Happens on driver removal. Seen with both qxl and bochs (the later using vram helpers). Testcase: "drmtest --unbind" (https://git.kraxel.org/cgit/drminfo/). static int try_unbind(int card) { char path[256]; char *device, *name; int fd; snprintf(path, sizeof(path), "/sys/class/drm/card%d/device", card); device = realpath(path, NULL); if (device == NULL) { fprintf(stderr, "%s: can't resolve sysfs device path\n", __func__); return -1; } snprintf(path, sizeof(path), "%s/driver/unbind", device); fd = open(path, O_WRONLY); if (fd < 0) { fprintf(stderr, "open %s: %s\n", path, strerror(errno)); return -1; } name = strrchr(device, '/') + 1; write(fd, name, strlen(name)); close(fd); return 0; } take care, Gerd _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
