[MinnowBoard] Crash with SPI and general load

Fri Nov 14 15:31:55 UTC 2014

I've been driving an SPI LCD display from my MinnowBoard Max and things seem
to work well, except that the machine crashes when it gets busy.

I include the kernel Oops below.

More details:

1. I'm using a locally compiled 3.18rc3 kernel, against which I compiled the
low-speed-spider
    module from
https://github.com/MinnowBoard/minnow-max-extras/tree/master/modules/low-speed-spidev
    to give me entries in /dev

2. The machine was running the example program from 
    https://github.com/MinnowBoard/max-ILI9341-C-Driver-port

3. The machine was also compiling a kernel, and crashed after about an hour
of doing that. I've seen three such crashes now, and whilst I didn't keep
the earlier crash logs, they all mentioned the spi_pxa2xx.

Some questions:

1. Is there anything I can do to help fix this ?

2. There are both spi-pxa2xx-pci and spi-pxa2xx-platform modules: how are
these connected ?

3. Is there any reason that the low-speed-spidev code isn't integrated into
the mainline ?

Thanks in advance,
--
M.

1. 

[23926.099955] BUG: unable to handle kernel NULL pointer dereference at
000000000000001c
[23926.103072] IP: [<ffffffffa0212653>] pump_transfers+0x33/0x6c0
[spi_pxa2xx_platform]
[23926.106170] PGD 731e8067 PUD 7339b067 PMD 0 
[23926.109304] Oops: 0000 [#1] SMP 
[23926.112371] Modules linked in: low_speed_spidev(OE) spidev(E)
netconsole(E) configfs(E) snd_hda_codec_hdmi(E) snd_hda_intel(E)
snd_hda_controller(E) snd_hda_codec(E) snd_hwdep(E) snd_pcm(E)
snd_seq_midi(E) snd_seq_midi_event(E) dm_multipath(E) scsi_dh(E)
snd_rawmidi(E) intel_powerclamp(E) coretemp(E) kvm_intel(E) kvm(E)
crct10dif_pclmul(E) crc32_pclmul(E) ghash_clmulni_intel(E) snd_seq(E)
aesni_intel(E) aes_x86_64(E) snd_seq_device(E) lrw(E) gf128mul(E)
glue_helper(E) ablk_helper(E) cryptd(E) snd_timer(E) joydev(E) snd(E)
lpc_ich(E) spi_pxa2xx_pci(E) soundcore(E) i2c_designware_pci(E)
dw_dmac_pci(E) dw_dmac(E) dw_dmac_core(E) i2c_hid(E) intel_smartconnect(E)
i2c_designware_platform(E) i2c_designware_core(E) rfkill_gpio(E) mac_hid(E)
spi_pxa2xx_platform(E) 8250_dw(E) parport_pc(E) ppdev(E) lp(E) parport(E)
nls_iso8859_1(E) dm_mirror(E) dm_region_hash(E) dm_log(E) hid_generic(E)
usbhid(E) r8169(E) mii(E) hid(E) i915(E) i2c_algo_bit(E) video(E)
drm_kms_helper(E) sdhci_pci(E) sdhci_acpi(E) drm(E) sdhci(E) [last unloaded:
low_speed_spidev]
[23926.139611] CPU: 1 PID: 15 Comm: ksoftirqd/1 Tainted: G           OE 
3.18.0-rc3-mjo #1
[23926.143933] Hardware name: Intel Corp. VALLEYVIEW B3 PLATFORM/NOTEBOOK,
BIOS MNW2CRB1.X64.0071.R30.1408131301 08/13/2014
[23926.148409] task: ffff88007a8bb200 ti: ffff88007a90c000 task.ti:
ffff88007a90c000
[23926.152942] RIP: 0010:[<ffffffffa0212653>]  [<ffffffffa0212653>]
pump_transfers+0x33/0x6c0 [spi_pxa2xx_platform]
[23926.157613] RSP: 0018:ffff88007a90fd58  EFLAGS: 00010247
[23926.162260] RAX: 0000000000000000 RBX: ffff880078502440 RCX:
ffffffff81c4e000
[23926.166943] RDX: ffff8800785024a0 RSI: 0000000000000000 RDI:
ffff880078502440
[23926.171662] RBP: ffff88007a90fda8 R08: ffff88007a90c000 R09:
ffff88007285e400
[23926.176385] R10: 0000000000000000 R11: 0000000000000246 R12:
0000000000000000
[23926.181129] R13: ffff88003585fe48 R14: ffffc9000442a000 R15:
ffff88003585fde8
[23926.185857] FS:  0000000000000000(0000) GS:ffff880079a80000(0000)
knlGS:0000000000000000
[23926.190631] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[23926.195415] CR2: 000000000000001c CR3: 0000000073399000 CR4:
00000000001007e0
[23926.200259] Stack:
[23926.205072]  ffff88007a8bb714 ffffffff81c3db00 ffff88007a8bb200
ffff88007a8bb200
[23926.210016]  ffff88007a90fd98 ffff8800785024a8 0000000000000000
0000000000000006
[23926.214988]  0000000000000100 ffff88007a8bb200 ffff88007a90fdc8
ffffffff8106d035
[23926.219995] Call Trace:
[23926.224969]  [<ffffffff8106d035>] tasklet_action+0xf5/0x100
[23926.229999]  [<ffffffff8106d557>] __do_softirq+0xf7/0x2e0
[23926.235017]  [<ffffffff8106d771>] run_ksoftirqd+0x31/0x50
[23926.240037]  [<ffffffff8108bcb7>] smpboot_thread_fn+0xf7/0x1a0
[23926.245088]  [<ffffffff8108bbc0>] ? SyS_setgroups+0x1a0/0x1a0
[23926.250154]  [<ffffffff81087f34>] kthread+0xd4/0xf0
[23926.255222]  [<ffffffff81087e60>] ? kthread_create_on_node+0x190/0x190
[23926.260342]  [<ffffffff81779ebc>] ret_from_fork+0x7c/0xb0
[23926.265505]  [<ffffffff81087e60>] ? kthread_create_on_node+0x190/0x190
[23926.270695] Code: e5 41 57 41 56 41 55 41 54 53 48 8d 1f 48 8d 64 24 d8
4c 8b a7 e0 00 00 00 4c 8b bf d0 00 00 00 4c 8b 77 38 4c 8b af d8 00 00 00
<41> 8b 44 24 1c 89 45 c8 41 8b 44 24 14 89 45 cc 49 8b 47 50 48 
[23926.281873] RIP  [<ffffffffa0212653>] pump_transfers+0x33/0x6c0
[spi_pxa2xx_platform]
[23926.287378]  RSP <ffff88007a90fd58>
[23926.292815] CR2: 000000000000001c
[23926.324089] ---[ end trace 14b4e65c34f29523 ]---
[23926.329463] Kernel panic - not syncing: Fatal exception in interrupt
[23926.334873] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range:
0xffffffff80000000-0xffffffff9fffffff)
[23926.340437] drm_kms_helper: panic occurred, switching back to text
console
[23926.346043] ---[ end Kernel panic - not syncing: Fatal exception in
interrupt

--
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