<div dir="ltr">With linux-next-2017-12-14, I get a crash when nouveau is loaded by systemd-udevd. [ 12.050625] Unable to handle kernel NULL pointer dereference at virtual address 00000058 [ 12.050627] Mem abort info: [ 12.050628] ESR = 0x96000004 [ 12.050630] Exception class = DABT (current EL), IL = 32 bits [ 12.050631] SET = 0, FnV = 0 [ 12.050632] EA = 0, S1PTW = 0 [ 12.050633] Data abort info: [ 12.050634] ISV = 0, ISS = 0x00000004 [ 12.050635] CM = 0, WnR = 0 [ 12.050637] user pgtable: 4k pages, 48-bit VAs, pgd = 00000000af2ac1b1 [ 12.050639] [0000000000000058] *pgd=0000000000000000 [ 12.050643] Internal error: Oops: 96000004 [#1] SMP [ 12.050644] Modules linked in: dwmac_dwc_qos_eth(+) stmmac_platform stmmac ptp nouveau(+) tegra_drm(+) i2c_algo_bit ttm gpio_keys drm_kms_helper drm drm_panel_orientation_quirks(P) syscopy area sysfillrect sysimgblt fb_sys_fops pps_core host1x [ 12.050665] CPU: 0 PID: 261 Comm: systemd-udevd Tainted: P S 4.15.0-rc3-next-20171214-ARCH-AEDEN+ #3 [ 12.050666] Hardware name: NVIDIA Tegra186 P2771-0000 Development Board (DT) [ 12.050668] pstate: 80000005 (Nzcv daif -PAN -UAO) [ 12.050675] pc : mutex_lock+0x28/0x58 [ 12.050676] lr : mutex_lock+0x1c/0x58 [ 12.050677] sp : ffff00000a33b970 [ 12.050679] x29: ffff00000a33b970 x28: ffff000009527a20 [ 12.050682] x27: ffff8001c5089c00 x26: ffffffffffffffff [ 12.050684] x25: 0000000000000001 x24: 0000000000000001 [ 12.050686] x23: 0000000000000000 x22: 0000000000000000 [ 12.050689] x21: ffff8001c8c5af80 x20: 0000000000000058 [ 12.050691] x19: 0000000000000058 x18: 0000000000000230 [ 12.050693] x17: fffffffffffffff0 x16: ffff7e00071fb300 [ 12.050695] x15: 0000000000000000 x14: ffffffffffffffff [ 12.050697] x13: 0000000000000038 x12: 0000000000000018 [ 12.050700] x11: 0101010101010101 x10: 7f7f7f7f7f7f7f7f [ 12.050702] x9 : 0000000000000000 x8 : ffff8001c8c5b000 [ 12.050704] x7 : 0000000000000000 x6 : 000000000000003f [ 12.050706] x5 : 0000000000000040 x4 : 0000000000000000 [ 12.050708] x3 : 0000000000000004 x2 : 0000000000000000 [ 12.050710] x1 : ffff8001c915b800 x0 : 0000000000000000 [ 12.050713] Process systemd-udevd (pid: 261, stack limit = 0x00000000247b2b64) [ 12.050714] Call trace: [ 12.050717] mutex_lock+0x28/0x58 [ 12.050721] iommu_attach_device+0xac/0xf8 [ 12.050948] nvkm_device_tegra_new+0x260/0x510 [nouveau] [ 12.051166] nouveau_platform_device_create+0x48/0xa8 [nouveau] [ 12.051364] nouveau_platform_probe+0x34/0x80 [nouveau] [ 12.051368] platform_drv_probe+0x60/0xc0 [ 12.051372] driver_probe_device+0x33c/0x4a0 [ 12.051375] __driver_attach+0xdc/0x128 [ 12.051377] bus_for_each_dev+0x5c/0xa8 [ 12.051379] driver_attach+0x30/0x40 [ 12.051381] bus_add_driver+0x218/0x2b8 [ 12.051384] driver_register+0x6c/0x118 [ 12.051385] __platform_driver_register+0x54/0x60 [ 12.051578] nouveau_drm_init+0x164/0x1000 [nouveau] [ 12.051584] do_one_initcall+0x44/0x138 [ 12.051588] do_init_module+0x64/0x1dc [ 12.051590] load_module+0x12f4/0x14b8 [ 12.051592] SyS_finit_module+0xd8/0xf0 [ 12.051594] el0_svc_naked+0x20/0x24 [ 12.051597] Code: 97fffa1e d2800000 d5384101 f9800271 (c85ffe62) [ 12.051600] ---[ end trace 7e15532ee457d321 ]--- [ 12.346156] iommu: Adding device 15220000.display to group 1 [ 12.360735] tegra-dpaux 15040000.dpaux: 15040000.dpaux supply vdd not found, using dummy regulator [ 12.372895] tegra-dpaux 155c0000.dpaux: 155c0000.dpaux supply vdd not found, using dummy regulator [ 12.384763] tegra-sor 15580000.sor: failed to probe output: -517 [ 12.391830] tegra-sor 15580000.sor: failed to probe output: -517 Here's the trace with files and line numbers (via addr2line -pfi): __cmpxchg_case_acq_8 at arch/arm64/include/asm/atomic_ll_sc.h:284 (inlined by) __cmpxchg_acq at arch/arm64/include/asm/cmpxchg.h:140 (inlined by) __mutex_trylock_fast at kernel/locking/mutex.c:143 (inlined by) mutex_lock at kernel/locking/mutex.c:240 iommu_group_device_count at drivers/iommu/iommu.c:673 (inlined by) iommu_attach_device at drivers/iommu/iommu.c:1312 clk_prepare_enable at include/linux/clk.h:646 (inlined by) nvkm_device_tegra_power_up at drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c:37 (inlined by) nvkm_device_tegra_new at drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c:319 nouveau_platform_device_create at drivers/gpu/drm/nouveau/nouveau_drm.c:1193 nouveau_platform_probe at drivers/gpu/drm/nouveau/nouveau_platform.c:44 platform_drv_probe at drivers/base/platform.c:577 really_probe at drivers/base/dd.c:423 (inlined by) driver_probe_device at drivers/base/dd.c:565 __driver_attach at drivers/base/dd.c:799 bus_for_each_dev at drivers/base/bus.c:311 driver_attach at drivers/base/dd.c:819 bus_add_driver at drivers/base/bus.c:668 driver_register at drivers/base/driver.c:166 __platform_driver_register at drivers/base/platform.c:636 nouveau_drm_init at drivers/gpu/drm/nouveau/nouveau_drm.c:1212 do_one_initcall at init/main.c:833 do_init_module at kernel/module.c:3451 load_module at kernel/module.c:3775 SYSC_finit_module at kernel/module.c:3874 (inlined by) SyS_finit_module at kernel/module.c:3850 el0_svc_naked at arch/arm64/kernel/entry.S:937 Serial output is attached which includes rest of dmesg. Thanks, -Anthony</div>