Stefan Wahren <stefan.wahren@xxxxxxxx> writes: > Hi, > > i tried to boot 4.7.0-rc1-next-20160602 with bcm2835_defconfig on a Raspberry Pi > B. > > Unfortunately it crashes with a NULL pointer dereference and many oops > following: > ... > [ 2.209373] vc4-drm soc:gpu: bound 20902000.hdmi (ops vc4_hdmi_ops) > [ 2.228303] vc4-drm soc:gpu: bound 20206000.pixelvalve (ops vc4_crtc_ops) > [ 2.247681] vc4-drm soc:gpu: bound 20207000.pixelvalve (ops vc4_crtc_ops) > [ 2.270300] vc4-drm soc:gpu: bound 20807000.pixelvalve (ops vc4_crtc_ops) > [ 2.288902] vc4-drm soc:gpu: bound 20400000.hvs (ops vc4_hvs_ops) > [ 2.307006] vc4-drm soc:gpu: bound 20c00000.v3d (ops vc4_v3d_ops) > [ 2.325069] fb: switching to vc4drmfb from simple > [ 2.341322] Console: switching to colour dummy device 80x30 > [ 2.350955] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). > [ 2.357821] [drm] No driver support for vblank timestamp query. > [ 2.368495] mmc0: new SDHC card at address 1234 > [ 2.374284] mmcblk0: mmc0:1234 SA32G 29.3 GiB > [ 2.381213] mmcblk0: p1 p2 > [ 2.398018] vc4-drm soc:gpu: failed to allocate buffer with size 9216000 > [ 2.404912] Unable to handle kernel NULL pointer dereference at virtual > address 00000000 > [ 2.413070] pgd = c0004000 > [ 2.415856] [00000000] *pgd=00000000 > [ 2.419501] Internal error: Oops: 80000005 [#1] ARM > [ 2.424425] CPU: 0 PID: 6 Comm: kworker/u2:0 Not tainted > 4.7.0-rc1-next-20160602+ #2 > [ 2.432214] Hardware name: BCM2835 > [ 2.435677] Workqueue: deferwq deferred_probe_work_func > [ 2.440948] task: cb8957c0 ti: cb8b2000 task.ti: cb8b2000 > [ 2.446378] PC is at 0x0 > [ 2.448953] LR is at drm_gem_cma_create+0xf0/0x108 Figure out where in drm_gem_cma_create() you are? -next kernels have been working for me on Pi 2s and 3s, and jumping to a NULL seems surprising for that function.
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