Discussion:
vc4_hdmi: NULL pointer deference in 4.17.0-rc1-next-20180419
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Stefan Wahren
2018-04-20 13:05:59 UTC
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Hi,
i noticed on kernelci.org that the boot on RPi 1 B with 4.17.0-rc1-next-20180419 (bcm2835_defconfig) triggered a NULL pointer dereference [1]. But for today [2] there isn't such an issue. I assume this is timing related. Any hints are welcome.

Stefan

[1] - https://storage.kernelci.org/next/master/next-20180419/arm/bcm2835_defconfig/lab-baylibre-seattle/boot-bcm2835-rpi-b.html
[2] - https://storage.kernelci.org/next/master/next-20180420/arm/bcm2835_defconfig/lab-baylibre-seattle/boot-bcm2835-rpi-b.html

[ 1.794308] Unable to handle kernel NULL pointer dereference at virtual address 00000004
[ 1.802407] pgd = c0ba09c3
[ 1.805173] [00000004] *pgd=00000000
[ 1.808763] Internal error: Oops: 5 [#1] ARM
[ 1.813027] Modules linked in:
[ 1.816089] CPU: 0 PID: 48 Comm: kworker/0:2 Not tainted 4.17.0-rc1-next-20180419 #1
[ 1.823816] Hardware name: BCM2835
[ 1.827231] Workqueue: events deferred_probe_work_func
[ 1.832391] PC is at snd_soc_register_card+0x940/0xdc4
[ 1.837531] LR is at refcount_dec_and_test+0x18/0x1c
[ 1.842489] pc : [<c057bc94>] lr : [<c03a4474>] psr: 60000013
[ 1.848743] sp : d971bc70 ip : 00000000 fp : d971bcc4
[ 1.853957] r10: 00000003 r9 : 00000001 r8 : d9725594
[ 1.859172] r7 : d97255ec r6 : 00000000 r5 : d97aa800 r4 : d972541c
[ 1.865688] r3 : 00000000 r2 : cac788dc r1 : d9711824 r0 : 00000000
[ 1.872205] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
[ 1.879328] Control: 00c5387d Table: 00004008 DAC: 00000051
[ 1.885068] Process kworker/0:2 (pid: 48, stack limit = 0x890186d8)
[ 1.891325] Stack: (0xd971bc70 to 0xd971c000)
[ 1.895680] bc60: 00000000 d972549c c0c515ac 00000001
[ 1.903852] bc80: d97254f8 d97254a4 d9725504 00000002 d9556610 d97af680 c0c41248 00000000
[ 1.912024] bca0: d97aeb90 d972541c d9556610 d9556600 c0c41248 c083d3b0 d971bce4 d971bcc8
[ 1.920197] bcc0: c0588efc c057b360 00000000 d9725410 d9556610 d9556610 d971bd24 d971bce8
[ 1.928369] bce0: c045e0ac c0588ec8 00000000 d9724c00 0000000c 00000000 d971bd24 d96cdbc0
[ 1.936540] bd00: d9712840 d9556c10 00000000 d9724c00 014000c0 00000014 d971bd5c d971bd28
[ 1.944712] bd20: c0465488 c045dc80 d9556c10 c045c340 d971bd5c d9724c00 00000000 d9556c10
[ 1.952884] bd40: d96cdb90 00000007 d9712a40 c0c4166c d971bd7c d971bd60 c045624c c0465378
[ 1.961057] bd60: d96cdbc0 d9712a40 d95f5bb8 d96cdb90 d971bdbc d971bd80 c0464fb4 c04561d0
[ 1.969229] bd80: 00000018 c0223a94 d9556a10 c0455f6c d971bdbc d9712a40 c0c41680 c083e1cc
[ 1.977401] bda0: d96cdbc0 c0d38a64 00000007 00000000 d971bddc d971bdc0 c0465120 c0464e48
[ 1.985574] bdc0: c0461f54 d9556a10 c0c41620 c0d38a60 d971bdec d971bde0 c0461f74 c046509c
[ 1.993745] bde0: d971be0c d971bdf0 c046ce2c c0461f60 d9556a10 00000000 c0c41620 c0d38a60
[ 2.001918] be00: d971be44 d971be10 c046b224 c046cdd8 c05564b0 c0554bbc d971be44 00000001
[ 2.010089] be20: d9556a10 c0c41620 d971be90 c0c0be90 00000000 00000008 d971be64 d971be48
[ 2.018261] be40: c046b690 c046b024 00000000 d971be90 c046b5d0 d9556a44 d971be8c d971be68
[ 2.026433] be60: c0469470 c046b5dc d94c659c d96b48b4 d9556a10 d9556a10 c0c41980 00000001
[ 2.034605] be80: d971beb4 d971be90 c046af04 c04693e8 d9556a10 00000001 d9556a10 c0c41980
[ 2.042777] bea0: d9556a10 d9c58200 d971bec4 d971beb8 c046b6f4 c046ae74 d971bee4 d971bec8
[ 2.050949] bec0: c046a23c c046b6e4 d9556a10 c0c417b4 c0c417c8 d9c58200 d971bf0c d971bee8
[ 2.059121] bee0: c046a870 c046a210 d96e1980 c0c417d0 00000000 d9c58200 c0c0be90 00000000
[ 2.067293] bf00: d971bf44 d971bf10 c0133f9c c046a78c c0c145a0 c0c0bea4 c0134b34 d96e1980
[ 2.075465] bf20: 00000000 c0c0be90 c0c145a0 c0c0bea4 d96e1998 00000008 d971bf74 d971bf48
[ 2.083637] bf40: c0134e08 c0133db0 00000000 d96ff540 d96eb400 d971a000 00000000 d96e1980
[ 2.091809] bf60: c0134b34 d94f7e9c d971bfac d971bf78 c01399ec c0134b40 d96ff558 d96ff558
[ 2.099980] bf80: d971bfac d96eb400 c01398ac 00000000 00000000 00000000 00000000 00000000
[ 2.108150] bfa0: 00000000 d971bfb0 c01010e8 c01398b8 00000000 00000000 00000000 00000000
[ 2.116319] bfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 2.124488] bfe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[ 2.132702] [<c057bc94>] (snd_soc_register_card) from [<c0588efc>] (devm_snd_soc_register_card+0x40/0x7c)
[ 2.142276] [<c0588efc>] (devm_snd_soc_register_card) from [<c045e0ac>] (vc4_hdmi_bind+0x438/0x4fc)
[ 2.151332] [<c045e0ac>] (vc4_hdmi_bind) from [<c0465488>] (component_bind_all+0x11c/0x238)
[ 2.159702] [<c0465488>] (component_bind_all) from [<c045624c>] (vc4_drm_bind+0x88/0x138)
[ 2.167885] [<c045624c>] (vc4_drm_bind) from [<c0464fb4>] (try_to_bring_up_master+0x178/0x254)
[ 2.176497] [<c0464fb4>] (try_to_bring_up_master) from [<c0465120>] (component_add+0x90/0x120)
[ 2.185107] [<c0465120>] (component_add) from [<c0461f74>] (vc4_v3d_dev_probe+0x20/0x28)
[ 2.193204] [<c0461f74>] (vc4_v3d_dev_probe) from [<c046ce2c>] (platform_drv_probe+0x60/0xb0)
[ 2.201730] [<c046ce2c>] (platform_drv_probe) from [<c046b224>] (driver_probe_device+0x20c/0x46c)
[ 2.210599] [<c046b224>] (driver_probe_device) from [<c046b690>] (__device_attach_driver+0xc0/0x108)
[ 2.219727] [<c046b690>] (__device_attach_driver) from [<c0469470>] (bus_for_each_drv+0x94/0xa4)
[ 2.228507] [<c0469470>] (bus_for_each_drv) from [<c046af04>] (__device_attach+0x9c/0x138)
[ 2.236767] [<c046af04>] (__device_attach) from [<c046b6f4>] (device_initial_probe+0x1c/0x20)
[ 2.245286] [<c046b6f4>] (device_initial_probe) from [<c046a23c>] (bus_probe_device+0x38/0x90)
[ 2.253893] [<c046a23c>] (bus_probe_device) from [<c046a870>] (deferred_probe_work_func+0xf0/0x140)
[ 2.262942] [<c046a870>] (deferred_probe_work_func) from [<c0133f9c>] (process_one_work+0x1f8/0x368)
[ 2.272075] [<c0133f9c>] (process_one_work) from [<c0134e08>] (worker_thread+0x2d4/0x424)
[ 2.280260] [<c0134e08>] (worker_thread) from [<c01399ec>] (kthread+0x140/0x160)
[ 2.287660] [<c01399ec>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
[ 2.294870] Exception stack(0xd971bfb0 to 0xd971bff8)
[ 2.299916] bfa0: 00000000 00000000 00000000 00000000
[ 2.308085] bfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 2.316252] bfe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 2.322866] Code: 0a000001 e1a00005 eb00331f e595356c (e5932004)
[ 2.329081] ---[ end trace 4a7c976e001c7aa4 ]---

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