https://bugzilla.kernel.org/show_bug.cgi?id=206299 --- Comment #8 from Frédéric Pierret (frederic.epitre@xxxxxxxxx) --- We found more information! The previous tests was done with those added lines: --- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/channv50.c +++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/channv50.c @@ -75,13 +75,25 @@ nv50_disp_chan_mthd(struct nv50_disp_chan *chan, int debug) if (debug > subdev->debug) return; + nvkm_warn(subdev, "mthd: %p", mthd); + nvkm_warn(subdev, "mthd->data: %p", mthd->data); + nvkm_warn(subdev, "&mthd->data[0]: %p", &mthd->data[0]); + nvkm_warn(subdev, "mthd->data[0].mthd: %p", mthd->data[0].mthd); for (i = 0; (list = mthd->data[i].mthd) != NULL; i++) { which gaves as crashlog: [ 45.513617] nouveau 0000:26:00.0: disp: chid 73 stat 00001080 reason 1 [PUSHBUFFER_ERR] mthd 0200 data badf5040 code badf5040 [ 45.513633] nouveau 0000:26:00.0: disp: mthd: 00000000dfa55708 [ 45.513638] nouveau 0000:26:00.0: disp: mthd->data: 00000000858af80f [ 45.513641] nouveau 0000:26:00.0: disp: &mthd->data[0]: 00000000858af80f But replacing "%p" by "%lx", it revealed that mthd is NULL: [ 74.753207] nouveau 0000:26:00.0: disp: chid 73 stat 00001080 reason 1 [PUSHBUFFER_ERR] mthd 0200 data badf5040 code badf5040 [ 74.753223] nouveau 0000:26:00.0: disp: mthd: 0 [ 74.753226] nouveau 0000:26:00.0: disp: mthd->data: 10 [ 74.753231] nouveau 0000:26:00.0: disp: &mthd->data[0]: 10 [ 74.753241] BUG: kernel NULL pointer dereference, address: 0000000000000020 [ 74.753244] #PF: supervisor read access in kernel mode That gives some hints! -- You are receiving this mail because: You are watching the assignee of the bug. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
