Hi Boris, if i boot Raspberry Pi 3 (ARM64, defconfig, linux-next-20171122) with sufficient CMA memory (32 MB), i'll get this warning during boot: [ 7.623510] vc4-drm soc:gpu: bound 3f902000.hdmi (ops vc4_hdmi_ops [vc4]) [ 7.632453] vc4-drm soc:gpu: bound 3f806000.vec (ops vc4_vec_ops [vc4]) [ 7.639707] vc4-drm soc:gpu: bound 3f400000.hvs (ops vc4_hvs_ops [vc4]) [ 7.647364] vc4-drm soc:gpu: bound 3f206000.pixelvalve (ops vc4_crtc_ops [vc4]) [ 7.655451] vc4-drm soc:gpu: bound 3f207000.pixelvalve (ops vc4_crtc_ops [vc4]) [ 7.663415] vc4-drm soc:gpu: bound 3f807000.pixelvalve (ops vc4_crtc_ops [vc4]) [ 7.730580] vc4-drm soc:gpu: bound 3fc00000.v3d (ops vc4_v3d_ops [vc4]) [ 7.743965] [drm] Initialized vc4 0.0.0 20140616 for soc:gpu on minor 0 [ 7.750841] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [ 7.757620] [drm] Driver supports precise vblank timestamp query. [ 7.811775] ------------[ cut here ]------------ [ 7.811780] refcount_t: increment on 0; use-after-free. [ 7.811881] WARNING: CPU: 2 PID: 2188 at lib/refcount.c:153 refcount_inc+0x44/0x50 [ 7.811884] Modules linked in: vc4(+) cfg80211 cec drm_kms_helper smsc95xx usbnet drm rfkill brcmutil bcm2835_rng rng_core bcm2835_dma crc32_ce i2c_bcm2835 pwm_bcm2835 ip_tables x_tables ipv6 [ 7.811950] CPU: 2 PID: 2188 Comm: systemd-udevd Not tainted 4.14.0-next-20171122 #1 [ 7.811953] Hardware name: Raspberry Pi 3 Model B Rev 1.2 (DT) [ 7.811958] task: ffff800036b91c00 task.stack: ffff00000d6f0000 [ 7.811967] pstate: 20000005 (nzCv daif -PAN -UAO) [ 7.811974] pc : refcount_inc+0x44/0x50 [ 7.811981] lr : refcount_inc+0x44/0x50 [ 7.811984] sp : ffff00000d6f3300 [ 7.811988] x29: ffff00000d6f3300 x28: 0000000000000000 [ 7.811996] x27: 0000000000000003 x26: ffff800037107800 [ 7.812004] x25: 0000000000000001 x24: ffff800035afdc00 [ 7.812012] x23: 0000000000000000 x22: ffff800035dfa600 [ 7.812020] x21: ffff800035afd9b0 x20: ffff800035afd9a4 [ 7.812027] x19: 0000000000000000 x18: 0000000000000000 [ 7.812034] x17: 0000000000000001 x16: 0000000000000019 [ 7.812042] x15: 0000000000000001 x14: 00000000fffffff0 [ 7.812049] x13: ffff0000090ae840 x12: ffff000008fa2d50 [ 7.812057] x11: ffff000008fa2000 x10: ffff0000090ad000 [ 7.812064] x9 : 0000000000000000 x8 : ffff0000090b5c2f [ 7.812072] x7 : 0000000000000000 x6 : 000000000015ee00 [ 7.812079] x5 : 0000000000000000 x4 : 0000000000000000 [ 7.812087] x3 : ffffffffffffffff x2 : 0000800030047000 [ 7.812094] x1 : ffff800036b91c00 x0 : 000000000000002b [ 7.812102] Call trace: [ 7.812109] refcount_inc+0x44/0x50 [ 7.812226] vc4_bo_inc_usecnt+0x84/0x88 [vc4] [ 7.812310] vc4_prepare_fb+0x40/0xf0 [vc4] [ 7.812460] drm_atomic_helper_prepare_planes+0x54/0xf0 [drm_kms_helper] [ 7.812543] vc4_atomic_commit+0x88/0x130 [vc4] [ 7.812868] drm_atomic_commit+0x48/0x68 [drm] [ 7.813002] restore_fbdev_mode_atomic+0x1d8/0x1e8 [drm_kms_helper] [ 7.813113] restore_fbdev_mode+0x28/0x160 [drm_kms_helper] [ 7.813223] drm_fb_helper_restore_fbdev_mode_unlocked.part.24+0x28/0x90 [drm_kms_helper] [ 7.813331] drm_fb_helper_set_par+0x54/0xa8 [drm_kms_helper] [ 7.813346] fbcon_init+0x4e8/0x538 [ 7.813357] visual_init+0xb4/0x108 [ 7.813366] do_bind_con_driver+0x1b8/0x3a0 [ 7.813373] do_take_over_console+0x150/0x1d0 [ 7.813380] do_fbcon_takeover+0x6c/0xf0 [ 7.813387] fbcon_event_notify+0x8fc/0x928 [ 7.813399] notifier_call_chain+0x50/0x90 [ 7.813406] __blocking_notifier_call_chain+0x4c/0x90 [ 7.813413] blocking_notifier_call_chain+0x14/0x20 [ 7.813420] fb_notifier_call_chain+0x1c/0x28 [ 7.813426] register_framebuffer+0x1d0/0x2d8 [ 7.813533] __drm_fb_helper_initial_config_and_unlock+0x1e8/0x350 [drm_kms_helper] [ 7.813639] drm_fb_helper_initial_config+0x40/0x58 [drm_kms_helper] [ 7.813747] drm_fbdev_cma_init_with_funcs+0x88/0x158 [drm_kms_helper] [ 7.813855] drm_fbdev_cma_init+0x14/0x28 [drm_kms_helper] [ 7.813943] vc4_kms_load+0xa4/0xf0 [vc4] [ 7.814026] vc4_drm_bind+0x100/0x168 [vc4] [ 7.814038] try_to_bring_up_master+0x144/0x1a8 [ 7.814044] component_master_add_with_match+0x9c/0xe0 [ 7.814128] vc4_platform_drm_probe+0xb4/0xf0 [vc4] [ 7.814137] platform_drv_probe+0x58/0xc0 [ 7.814146] driver_probe_device+0x224/0x308 [ 7.814153] __driver_attach+0xac/0xb0 [ 7.814161] bus_for_each_dev+0x64/0xa0 [ 7.814169] driver_attach+0x20/0x28 [ 7.814177] bus_add_driver+0x108/0x228 [ 7.814184] driver_register+0x60/0xf8 [ 7.814190] __platform_driver_register+0x40/0x48 [ 7.814274] vc4_drm_register+0x38/0x1000 [vc4] [ 7.814283] do_one_initcall+0x38/0x120 [ 7.814295] do_init_module+0x58/0x1b8 [ 7.814304] load_module+0x1fa8/0x2280 [ 7.814311] SyS_finit_module+0xc0/0xd0 [ 7.814318] __sys_trace_return+0x0/0x4 [ 7.814325] ---[ end trace 3348554eb91e19a1 ]--- _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
