Hi Marc, On Mon, May 24, 2021 at 12:01:27PM +0200, Marc Haber wrote: > Hi, > > when running a current (5.12.6) Linux kernel on a Raspberry Pi 4 which > has KASAN enablen, upon (manual) loading of the vc4 module, the > following appears in dmesg: > > [ 27.713689] rc rc0: vc4 as /devices/platform/soc/fef00700.hdmi/rc/rc0 > [ 27.714408] input: vc4 as /devices/platform/soc/fef00700.hdmi/rc/rc0/input5 > [ 27.717603] debugfs: Directory 'fef00700.hdmi' with parent 'vc4-hdmi-0' already present! > [ 27.722211] vc4-drm gpu: bound fef00700.hdmi (ops vc4_hdmi_ops [vc4]) > [ 27.727765] Registered IR keymap rc-cec > [ 27.728809] rc rc1: vc4 as /devices/platform/soc/fef05700.hdmi/rc/rc1 > [ 27.729550] input: vc4 as /devices/platform/soc/fef05700.hdmi/rc/rc1/input6 > [ 27.736865] debugfs: Directory 'fef05700.hdmi' with parent 'vc4-hdmi-1' already present! > [ 27.740984] vc4-drm gpu: bound fef05700.hdmi (ops vc4_hdmi_ops [vc4]) > [ 27.741704] vc4-drm gpu: bound fe400000.hvs (ops vc4_hvs_ops [vc4]) > [ 27.742757] vc4-drm gpu: bound fe004000.txp (ops vc4_txp_ops [vc4]) > [ 27.744440] vc4-drm gpu: bound fe206000.pixelvalve (ops vc4_crtc_ops [vc4]) > [ 27.745161] vc4-drm gpu: bound fe207000.pixelvalve (ops vc4_crtc_ops [vc4]) > [ 27.746165] vc4-drm gpu: bound fe20a000.pixelvalve (ops vc4_crtc_ops [vc4]) > [ 27.746733] vc4-drm gpu: bound fe216000.pixelvalve (ops vc4_crtc_ops [vc4]) > [ 27.771356] [drm] Initialized vc4 0.0.0 20140616 for gpu on minor 0 > [ 27.827068] Console: switching to colour frame buffer device 160x50 > [ 27.827623] ================================================================== > [ 27.827638] BUG: KASAN: slab-out-of-bounds in vc4_atomic_commit_tail+0x1d4/0x950 [vc4] > [ 27.827822] Read of size 8 at addr ffff2b83c2956540 by task modprobe/499 > > [ 27.827840] CPU: 3 PID: 499 Comm: modprobe Tainted: G C E 5.12.5-zgrpi4 #1 > [ 27.827853] Hardware name: Raspberry Pi 4 Model B Rev 1.2 (DT) > [ 27.827861] Call trace: > [ 27.827865] dump_backtrace+0x0/0x2d0 > [ 27.827891] show_stack+0x24/0x30 > [ 27.827905] dump_stack+0xfc/0x168 > [ 27.827919] print_address_description.constprop.0+0x68/0x2b0 > [ 27.827931] kasan_report+0x1d4/0x270 > [ 27.827947] __asan_load8+0x94/0xd0 > [ 27.827959] vc4_atomic_commit_tail+0x1d4/0x950 [vc4] > [ 27.828116] commit_tail+0x104/0x20c [drm_kms_helper] > [ 27.828192] drm_atomic_helper_commit+0x1cc/0x460 [drm_kms_helper] > [ 27.828265] drm_atomic_commit+0x88/0xa0 [drm] > [ 27.828405] drm_client_modeset_commit_atomic+0x2f8/0x3a0 [drm] > [ 27.828542] drm_client_modeset_commit_locked+0x94/0x230 [drm] > [ 27.828679] drm_fb_helper_pan_display+0x16c/0x3b0 [drm_kms_helper] > [ 27.828753] fb_pan_display+0x130/0x200 > [ 27.828768] bit_update_start+0x3c/0xa0 > [ 27.828782] fbcon_switch+0x61c/0x854 > [ 27.828795] redraw_screen+0x188/0x364 > [ 27.828807] do_bind_con_driver.isra.0+0x458/0x530 > [ 27.828820] do_take_over_console+0x208/0x2f0 > [ 27.828832] do_fbcon_takeover+0x9c/0x130 > [ 27.828845] fbcon_fb_registered+0x154/0x170 > [ 27.828859] register_framebuffer+0x314/0x490 > [ 27.828870] __drm_fb_helper_initial_config_and_unlock+0x568/0x820 [drm_kms_helper] > [ 27.828943] drm_fbdev_client_hotplug+0x20c/0x380 [drm_kms_helper] > [ 27.829015] drm_fbdev_generic_setup+0xe8/0x240 [drm_kms_helper] > [ 27.829087] vc4_drm_bind+0x1d4/0x1f0 [vc4] > [ 27.829240] try_to_bring_up_master+0x260/0x2e0 > [ 27.829259] component_master_add_with_match+0x134/0x184 > [ 27.829270] vc4_platform_drm_probe+0x120/0x170 [vc4] > [ 27.829419] platform_probe+0x98/0x114 > [ 27.829429] really_probe+0x150/0x710 > [ 27.829442] driver_probe_device+0x80/0xf0 > [ 27.829456] device_driver_attach+0x124/0x130 > [ 27.829470] __driver_attach+0xbc/0x190 > [ 27.829483] bus_for_each_dev+0xf0/0x160 > [ 27.829494] driver_attach+0x40/0x50 > [ 27.829507] bus_add_driver+0x1b0/0x2c0 > [ 27.829519] driver_register+0xec/0x21c > [ 27.829533] __platform_driver_register+0x50/0x60 > [ 27.829543] vc4_drm_register+0x54/0x1000 [vc4] > [ 27.829692] do_one_initcall+0xa8/0x350 > [ 27.829705] do_init_module+0xe8/0x3a4 > [ 27.829718] load_module+0x3298/0x3820 > [ 27.829729] __do_sys_finit_module+0x110/0x170 > [ 27.829741] __arm64_sys_finit_module+0x50/0x6c > [ 27.829753] el0_svc_common.constprop.0+0xa0/0x1a0 > [ 27.829767] do_el0_svc+0x90/0xb0 > [ 27.829779] el0_svc+0x20/0x30 > [ 27.829794] el0_sync_handler+0x1a4/0x1b0 > [ 27.829807] el0_sync+0x180/0x1c0 > > [ 27.829821] Allocated by task 499: > [ 27.829829] kasan_save_stack+0x28/0x60 > [ 27.829846] __kasan_kmalloc+0x88/0xb0 > [ 27.829858] kmem_cache_alloc_trace+0x1ec/0x3a4 > [ 27.829870] vc4_hvs_channels_duplicate_state+0x54/0x190 [vc4] > [ 27.830021] drm_atomic_get_private_obj_state+0x14c/0x230 [drm] > [ 27.830160] vc4_atomic_check+0x48/0x740 [vc4] > [ 27.830309] drm_atomic_check_only+0xa44/0xf00 [drm] > [ 27.830447] drm_atomic_commit+0x3c/0xa0 [drm] > [ 27.830583] drm_client_modeset_commit_atomic+0x2f8/0x3a0 [drm] > [ 27.830720] drm_client_modeset_commit_locked+0x94/0x230 [drm] > [ 27.830857] drm_client_modeset_commit+0x40/0x70 [drm] > [ 27.830994] drm_fb_helper_set_par+0x10c/0x180 [drm_kms_helper] > [ 27.831068] fbcon_init+0x3c4/0x88c > [ 27.831086] visual_init+0x154/0x1f0 > [ 27.831098] do_bind_con_driver.isra.0+0x2cc/0x530 > [ 27.831110] do_take_over_console+0x208/0x2f0 > [ 27.831122] do_fbcon_takeover+0x9c/0x130 > [ 27.831135] fbcon_fb_registered+0x154/0x170 > [ 27.831149] register_framebuffer+0x314/0x490 > [ 27.831160] __drm_fb_helper_initial_config_and_unlock+0x568/0x820 [drm_kms_helper] > [ 27.831233] drm_fbdev_client_hotplug+0x20c/0x380 [drm_kms_helper] > [ 27.831305] drm_fbdev_generic_setup+0xe8/0x240 [drm_kms_helper] > [ 27.831377] vc4_drm_bind+0x1d4/0x1f0 [vc4] > [ 27.831530] try_to_bring_up_master+0x260/0x2e0 > [ 27.831543] component_master_add_with_match+0x134/0x184 > [ 27.831554] vc4_platform_drm_probe+0x120/0x170 [vc4] > [ 27.831710] platform_probe+0x98/0x114 > [ 27.831720] really_probe+0x150/0x710 > [ 27.831733] driver_probe_device+0x80/0xf0 > [ 27.831746] device_driver_attach+0x124/0x130 > [ 27.831759] __driver_attach+0xbc/0x190 > [ 27.831772] bus_for_each_dev+0xf0/0x160 > [ 27.831784] driver_attach+0x40/0x50 > [ 27.831796] bus_add_driver+0x1b0/0x2c0 > [ 27.831808] driver_register+0xec/0x21c > [ 27.831821] __platform_driver_register+0x50/0x60 > [ 27.831831] vc4_drm_register+0x54/0x1000 [vc4] > [ 27.831981] do_one_initcall+0xa8/0x350 > [ 27.831992] do_init_module+0xe8/0x3a4 > [ 27.832004] load_module+0x3298/0x3820 > [ 27.832015] __do_sys_finit_module+0x110/0x170 > [ 27.832026] __arm64_sys_finit_module+0x50/0x6c > [ 27.832037] el0_svc_common.constprop.0+0xa0/0x1a0 > [ 27.832051] do_el0_svc+0x90/0xb0 > [ 27.832063] el0_svc+0x20/0x30 > [ 27.832076] el0_sync_handler+0x1a4/0x1b0 > [ 27.832090] el0_sync+0x180/0x1c0 > > [ 27.832102] The buggy address belongs to the object at ffff2b83c2956500 > which belongs to the cache kmalloc-128 of size 128 > [ 27.832111] The buggy address is located 64 bytes inside of > 128-byte region [ffff2b83c2956500, ffff2b83c2956580) > [ 27.832123] The buggy address belongs to the page: > [ 27.832128] page:0000000013b6837e refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x42956 > [ 27.832141] flags: 0x4000000000000200(slab) > [ 27.832160] raw: 4000000000000200 fffffcae0f0a5680 0000001000000002 ffff2b83c0002300 > [ 27.832171] raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 > [ 27.832177] page dumped because: kasan: bad access detected > > [ 27.832185] Memory state around the buggy address: > [ 27.832192] ffff2b83c2956400: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc > [ 27.832201] ffff2b83c2956480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > [ 27.832209] >ffff2b83c2956500: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc > [ 27.832214] ^ > [ 27.832221] ffff2b83c2956580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > [ 27.832229] ffff2b83c2956600: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > [ 27.832234] ================================================================== > [ 27.832239] Disabling lock debugging due to kernel taint > [ 28.373731] vc4-drm gpu: [drm] fb0: vc4drmfb frame buffer device > [ 28.602388] vc4_hdmi fef00700.hdmi: ASoC: error at snd_soc_dai_startup on fef00700.hdmi: -19 > [ 28.610889] vc4_hdmi fef00700.hdmi: ASoC: error at snd_soc_dai_startup on fef00700.hdmi: -19 > [ 28.672737] vc4_hdmi fef00700.hdmi: ASoC: error at snd_soc_dai_startup on fef00700.hdmi: -19 > [ 28.679625] vc4_hdmi fef00700.hdmi: ASoC: error at snd_soc_dai_startup on fef00700.hdmi: -19 > [ 28.689390] vc4_hdmi fef00700.hdmi: ASoC: error at snd_soc_dai_startup on fef00700.hdmi: -19 > [ 28.695457] vc4_hdmi fef00700.hdmi: ASoC: error at snd_soc_dai_startup on fef00700.hdmi: -19 > [ 28.701659] vc4_hdmi fef00700.hdmi: ASoC: error at snd_soc_dai_startup on fef00700.hdmi: -19 > [ 28.747178] vc4_hdmi fef05700.hdmi: ASoC: error at snd_soc_dai_startup on fef05700.hdmi: -19 > [ 28.754082] vc4_hdmi fef05700.hdmi: ASoC: error at snd_soc_dai_startup on fef05700.hdmi: -19 > [ 28.814820] vc4_hdmi fef05700.hdmi: ASoC: error at snd_soc_dai_startup on fef05700.hdmi: -19 > [ 28.816158] vc4_hdmi fef05700.hdmi: ASoC: error at snd_soc_dai_startup on fef05700.hdmi: -19 > [ 28.820460] vc4_hdmi fef05700.hdmi: ASoC: error at snd_soc_dai_startup on fef05700.hdmi: -19 > [ 28.821131] vc4_hdmi fef05700.hdmi: ASoC: error at snd_soc_dai_startup on fef05700.hdmi: -19 > [ 28.821646] vc4_hdmi fef05700.hdmi: ASoC: error at snd_soc_dai_startup on fef05700.hdmi: -19 > > > I have a hunch this shouldnt be there. > > Is this enough data you can work with? If I can of any more help, I'll > be happy to assist. I am just not a hacker or coder. I tried to reproduce it here, but couldn't come up with that error. Can you share a bit more information on the system you're seeing it on? What's your configuration, when does the issue comes up? Thanks! Maxime
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