[MinnowBoard] Crash with SPI and general load

[Martin Oldfield]

The bug appears to still exist in the 3.18rc4 kernel, which I compiled with a
(lightly modified) version of the recommended .config. You'll see that the
module list is much shorter, and there's no spi-pxa2xx-pci.

This time I just left the machine running the max-ILI9341-C-Driver-port
example, so the machine wasn't
particularly busy.

I include the log below.

Cheers,
--
M.


[57893.126478] BUG: unable to handle kernel NULL pointer dereference at
000000000000001c
[57893.130348] IP: [<ffffffffa00094fd>] pump_transfers+0x2d/0x6d0
[spi_pxa2xx_platform]
[57893.134213] PGD 72b80067 PUD 5e82f067 PMD 0 
[57893.138043] Oops: 0000 [#1] SMP 
[57893.141862] Modules linked in: i6300esb ie6xx_wdt spidev
low_speed_spidev(O) netconsole lpc_ich mfd_core dw_dmac dw_dmac_core
i2c_designware_platform i2c_designware_core spi_pxa2xx_platform
pwm_lpss_platform pwm_lpss
[57893.150162] CPU: 1 PID: 11 Comm: ksoftirqd/1 Tainted: G           O  
3.18.0-rc4-mjo #4
[57893.154360] Hardware name: Intel Corp. VALLEYVIEW B3 PLATFORM/NOTEBOOK,
BIOS MNW2CRB1.X64.0071.R30.1408131301 08/13/2014
[57893.158673] task: ffff880077f9f290 ti: ffff88007a820000 task.ti:
ffff88007a820000
[57893.163050] RIP: 0010:[<ffffffffa00094fd>]  [<ffffffffa00094fd>]
pump_transfers+0x2d/0x6d0 [spi_pxa2xx_platform]
[57893.167549] RSP: 0018:ffff88007a823d58  EFLAGS: 00010292
[57893.172035] RAX: ffff88003778fc90 RBX: ffff88003778fc30 RCX:
0000000004208040
[57893.176583] RDX: 0000000000000000 RSI: ffff880077f9f290 RDI:
ffff88003778fc30
[57893.181151] RBP: ffff88007a823da8 R08: ffff88007a820000 R09:
0000000000000000
[57893.185725] R10: 0000000000000000 R11: 0000000000000246 R12:
0000000000000000
[57893.190300] R13: ffff88005e82be48 R14: ffffc9000483e000 R15:
ffff88005e82bde8
[57893.194925] FS:  0000000000000000(0000) GS:ffff880079a80000(0000)
knlGS:0000000000000000
[57893.199630] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[57893.204308] CR2: 000000000000001c CR3: 0000000072b71000 CR4:
00000000001007e0
[57893.209020] Stack:
[57893.213682]  ffff88007a823dd8 ffffffff81076204 ffff880079a92bf0
0000000000012b80
[57893.218572]  ffff880077f9f788 ffff88003778fc98 0000000000000000
0000000000000006
[57893.223393]  0000000000000100 ffff880077f9f290 ffff88007a823dc8
ffffffff81049679
[57893.228232] Call Trace:
[57893.232986]  [<ffffffff81076204>] ? pick_next_task_fair+0x744/0x830
[57893.237778]  [<ffffffff81049679>] tasklet_action+0xa9/0xe0
[57893.242532]  [<ffffffff81049a0e>] __do_softirq+0xee/0x280
[57893.247274]  [<ffffffff81049bc0>] run_ksoftirqd+0x20/0x40
[57893.251994]  [<ffffffff810646df>] smpboot_thread_fn+0xff/0x1b0
[57893.256735]  [<ffffffff810645e0>] ? SyS_setgroups+0x150/0x150
[57893.261437]  [<ffffffff81060f9d>] kthread+0xcd/0xf0
[57893.266089]  [<ffffffff81060ed0>] ? kthread_create_on_node+0x180/0x180
[57893.270741]  [<ffffffff8187a82c>] ret_from_fork+0x7c/0xb0
[57893.275360]  [<ffffffff81060ed0>] ? kthread_create_on_node+0x180/0x180
[57893.279992] Code: 89 e5 41 57 41 56 41 55 41 54 53 48 89 fb 48 83 ec 28
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 
[57893.290048] RIP  [<ffffffffa00094fd>] pump_transfers+0x2d/0x6d0
[spi_pxa2xx_platform]
[57893.294989]  RSP <ffff88007a823d58>
[57893.299892] CR2: 000000000000001c
[57893.330023] ---[ end trace 049f42cf22b75750 ]---
[57893.334931] Kernel panic - not syncing: Fatal exception in interrupt
[57893.340112] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range:
0xffffffff80000000-0xffffffff9fffffff)
[57893.345281] drm_kms_helper: panic occurred, switching back to text
console
[57893.350397] ---[ end Kernel panic - not syncing: Fatal exception in
interrupt





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