[Letux-kernel] omap-gpmc gta04 regression 4.7-rc1

Belisko Marek marek.belisko at gmail.com
Sun Jun 5 11:47:41 CEST 2016


Hi Tony,

we're experiencing crash on gta04 after updating to 4.7-rc1. Crash is:

[    4.045166] Unable to handle kernel NULL pointer dereference at
virtual address 0000006c
[    4.053619] pgd = c0004000
[    4.056457] [0000006c] *pgd=00000000
[    4.060211] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
[    4.065795] Modules linked in:
[    4.069000] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.7.0-rc1-letux+ #351
[    4.076263] Hardware name: Generic OMAP36xx (Flattened Device Tree)
[    4.082824] task: dd8b6d80 ti: dd8b8000 task.ti: dd8b8000
[    4.088470] PC is at of_gpiochip_find_and_xlate+0x4/0x70
[    4.094024] LR is at gpiochip_find+0x3c/0x70
[    4.098510] pc : [<c0423570>]    lr : [<c041f348>]    psr: 20000093
[    4.098510] sp : dd8b9d50  ip : df9adc20  fp : 00000000
[    4.110504] r10: c0a50858  r9 : 00000007  r8 : c042356c
[    4.115936] r7 : dd8b9d80  r6 : 60000013  r5 : c0b5efb8  r4 : dda44800
[    4.122772] r3 : dda44abc  r2 : 00000000  r1 : dd8b9d80  r0 : 00000000
[    4.129608] Flags: nzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM
Segment none
[    4.137145] Control: 10c5387d  Table: 80004019  DAC: 00000051
[    4.143157] Process swapper/0 (pid: 1, stack limit = 0xdd8b8218)
[    4.149444] Stack: (0xdd8b9d50 to 0xdd8ba000)
[    4.153991] 9d40:                                     dda44abc
dda44800 c0b5efb8 c041f348
[    4.162536] 9d60: dd8b9df4 00000000 dd8b9df8 df9c2940 00000000
c04236ac dd8b9d84 dd8b9dfe
[    4.171112] 9d80: dd8b9df4 df9b2cd4 00000002 00000000 00000001
00000000 00000000 00000000
[    4.179656] 9da0: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[    4.188201] 9dc0: 00000000 00000000 00000000 fffffdfb dd8b9df8
00000000 c0730f08 dda61c10
[    4.196746] 9de0: c088c0f6 c0422958 c08e8f80 c0b9b533 ddd75440
00000000 65736572 70672d74
[    4.205291] 9e00: 00736f69 70672d74 00736f69 c0246c14 dd8b6d80
00000007 00000001 ddd75440
[    4.213867] 9e20: 00000001 dda61c10 dda61c10 c088c0f6 00000007
c0422bd0 ffffffff 00000007
[    4.222412] 9e40: ddd75490 dda61c10 c088c0f6 c1364aa4 00000000
c041ecac ddd75480 ddd754d0
[    4.230957] 9e60: dda61c10 dda61c00 c0b7dfcc c0593324 c05932d0
dda61c10 c0b7dfcc c0481c08
[    4.239501] 9e80: dda61c10 c1364a9c 00000000 c047fce8 00000000
dda61c10 dda61c44 c0b7dfcc
[    4.248046] 9ea0: c0b67c60 c0b9e4c0 c0b9e4c0 c047fed8 00000000
c0b7dfcc c047fe50 c047e3b8
[    4.256622] 9ec0: dd899aa4 dda3a1d0 c0b7dfcc 00000000 ddd72180
c047f398 c08e2ef2 dd8b7310
[    4.265167] 9ee0: 00000000 c0b7dfcc c0a3b71c 00000000 c0a6a668
c0480e28 c04816e0 00000006
[    4.273712] 9f00: c0a3b71c c010192c 00000073 dd8b9f28 c0150f40
c03f3694 60000000 ffffffff
[    4.282257] 9f20: 00000051 c0b9e4c0 000000b0 df97c1ae 00000000
c01510d4 c0934738 00000006
[    4.290802] 9f40: 00000006 c093550c 000000b0 c093550c c0a50834
00000006 c0a5084c 00000006
[    4.299377] 9f60: c0a50850 000000b1 c0a6a668 c0b9e4c0 c0b9e4c0
c0a00d78 00000006 00000006
[    4.307922] 9f80: 00000000 c0a00598 00000000 c06ced10 00000000
00000000 00000000 00000000
[    4.316467] 9fa0: 00000000 c06ced18 00000000 c01070d0 00000000
00000000 00000000 00000000
[    4.325012] 9fc0: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[    4.333557] 9fe0: 00000000 00000000 00000000 00000000 00000013
00000000 01000000 00040040
[    4.342132] [<c0423570>] (of_gpiochip_find_and_xlate) from
[<c041f348>] (gpiochip_find+0x3c/0x70)
[    4.351409] [<c041f348>] (gpiochip_find) from [<c04236ac>]
(of_get_named_gpiod_flags+0x70/0x8c)
[    4.360504] [<c04236ac>] (of_get_named_gpiod_flags) from
[<c0422958>] (gpiod_get_index+0x80/0x22c)
[    4.369873] [<c0422958>] (gpiod_get_index) from [<c0422bd0>]
(gpiod_get_array+0x60/0xa8)
[    4.378326] [<c0422bd0>] (gpiod_get_array) from [<c041ecac>]
(devm_gpiod_get_array+0x3c/0x7c)
[    4.387237] [<c041ecac>] (devm_gpiod_get_array) from [<c0593324>]
(mmc_pwrseq_simple_probe+0x54/0xa8)
[    4.396881] [<c0593324>] (mmc_pwrseq_simple_probe) from
[<c0481c08>] (platform_drv_probe+0x50/0xa0)
[    4.406372] [<c0481c08>] (platform_drv_probe) from [<c047fce8>]
(driver_probe_device+0x134/0x29c)
[    4.415649] [<c047fce8>] (driver_probe_device) from [<c047fed8>]
(__driver_attach+0x88/0xac)
[    4.424468] [<c047fed8>] (__driver_attach) from [<c047e3b8>]
(bus_for_each_dev+0x6c/0x90)
[    4.433013] [<c047e3b8>] (bus_for_each_dev) from [<c047f398>]
(bus_add_driver+0xcc/0x1e8)
[    4.441589] [<c047f398>] (bus_add_driver) from [<c0480e28>]
(driver_register+0xac/0xf4)
[    4.449951] [<c0480e28>] (driver_register) from [<c010192c>]
(do_one_initcall+0xac/0x154)
[    4.458526] [<c010192c>] (do_one_initcall) from [<c0a00d78>]
(kernel_init_freeable+0x120/0x1ec)
[    4.467620] [<c0a00d78>] (kernel_init_freeable) from [<c06ced18>]
(kernel_init+0x8/0x110)
[    4.476196] [<c06ced18>] (kernel_init) from [<c01070d0>]
(ret_from_fork+0x14/0x24)
[    4.484100] Code: e5940000 e8bd4010 eaf892e1 e92d4038 (e590c06c)
[    4.490539] ---[ end trace ad1af1376ad53c79 ]---
[    4.495361] note: swapper/0[1] exited with preempt_count 1
[    4.503417] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x0000000b

during trying to lookup for gpio in pwrseq_simple node.

I did some investigation and some lines above I can see:

[    0.820983] omap-gpmc 6e000000.gpmc: GPMC revision 5.0
[    0.821319] gpmc_mem_init: disabling cs 0 mapped at 0x0-0x1000000
[    0.821411] gpiochip_find_base: found new base at 508
[    0.821441] gpio gpiochip6: gpiodev_add_to_list adding: omap-gpmc
[    0.821502] gpio gpiochip6: (omap-gpmc): added GPIO chardev (254:6)
[    0.825042] gpiochip_setup_dev: registered GPIOs 508 to 511 on
device: gpiochip6 (omap-gpmc)
[    0.825286] omap-gpmc 6e000000.gpmc: cannot request GPMC CS 0
[    0.825317] omap-gpmc 6e000000.gpmc: failed to probe DT children
[    0.829620] omap-gpmc: probe of 6e000000.gpmc failed with error -16

negative return code comes from: allocated_resource (in gpmc_cs_request)

I add some debug functions to gpiolib and it turns out that omap-gpmc
gpio's are added to list of gpio chips but because probe of gpmc
failed then pointer to dt node is null and then it fails in
of_gpiochip_find_and_xlate with null pointer access. Any idea what can
cause this or do you have other report that booting doesn't work? Many
thanks.

BR,

marek


-- 
as simple and primitive as possible
-------------------------------------------------
Marek Belisko - OPEN-NANDRA
Freelance Developer

Ruska Nova Ves 219 | Presov, 08005 Slovak Republic
Tel: +421 915 052 184
skype: marekwhite
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