linux-kernel - Re: [PATCH] edac: mpc85xx: implement "remove" for mpc85xx_pci_err

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Message-ID: <20161116100824.rhskztzqjpislml4@pd.tnic>
Date:   Wed, 16 Nov 2016 11:08:24 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     yanjiang.jin@...driver.com
Cc:     morbidrsa@...il.com, mchehab@...nel.org, york.sun@....com,
        scottwood@....com, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org, jinyanjing@...il.com
Subject: Re: [PATCH] edac: mpc85xx: implement "remove" for
 mpc85xx_pci_err_driver

On Wed, Nov 16, 2016 at 02:26:14PM +0800, yanjiang.jin@...driver.com wrote:
> From: Yanjiang Jin <yanjiang.jin@...driver.com>
> 
> Tested on a T4240QDS board.
> 
> If we execute the below steps without this patch:
> 
> 1. modprobe mpc85xx_edac [The first insmod, everything is well.]
> 2. modprobe -r mpc85xx_edac
> 3. modprobe mpc85xx_edac [insmod again, error happens.]
> 
> We would get the below error:

Looks ok to me, I'd let the people who are more knowledgeable of
mpc85xx_edac chime in here...

> BUG: recent printk recursion!
> Oops: Kernel access of bad area, sig: 11 [#48]
> PREEMPT SMP NR_CPUS=24 CoreNet Generic
> Modules linked in: mpc85xx_edac edac_core softdog [last unloaded: mpc85xx_edac]
> CPU: 5 PID: 14773 Comm: modprobe Tainted: G D C 4.8.3-rt2
> task: c0000005cdc40d40 task.stack: c0000005c8814000
> NIP: c0000000005c5b60 LR: c0000000005c895c CTR: c0000000005c8940
> REGS: c0000005c8816e20 TRAP: 0300 Tainted: G D C (4.8.3-rt2-WR9.0.0.0_preempt-rt)
> MSR: 0000000080029000 <CE,EE,ME> CR: 28222828 XER: 20000000
> DEAR: 80000000005392d8 ESR: 0000000000000100 SOFTE: 0
> GPR00: c0000000005c8844 c0000005c88170a0 c0000000011db400 c000000001220496
> GPR04: c000000001220838 c000000001220838 04ffffff000affff 80000000005392d8
> GPR08: c0000000005cb400 c0000000005c8940 fffffffffffffffe 80000000004c9108
> GPR12: c000000000bdad80 c00000003fff7300 000000000000fff1 c000000000d1c7f0
> GPR16: 0000000000000001 000000000000003f c0000005c8817c20 c000000000bed4e0
> GPR20: 0000000000000000 c0000000011fdaa0 0000000000000002 80000000004ccafe
> GPR24: c0000005c8817390 0000000000000025 c000000001220458 0000000000000020
> GPR28: 00000000000003e0 c000000001220838 80000000004ccafe c000000001220496
> NIP [c0000000005c5b60] .string+0x20/0xa0
> LR [c0000000005c895c] .vsnprintf+0x1ac/0x490
> Call Trace:
> [c0000005c88170a0] [c0000000005c8844] .vsnprintf+0x94/0x490 (unreliable)
> [c0000005c8817170] [c0000000005c8c58] .vscnprintf+0x18/0x70
> [c0000005c88171f0] [c0000000000d5920] .vprintk_emit+0x120/0x600
> [c0000005c88172c0] [c000000000bdae44] .printk+0xc4/0xe0
> [c0000005c8817340] [80000000004c6f5c] .edac_pci_add_device+0x2fc/0x350 [edac_core]
> [c0000005c88173e0] [8000000000759d64] .mpc85xx_pci_err_probe+0x344/0x550 [mpc85xx_edac]
> [c0000005c88174c0] [c0000000006952b4] .platform_drv_probe+0x84/0x120
> [c0000005c8817550] [c000000000692294] .driver_probe_device+0x2f4/0x3d0
> [c0000005c88175f0] [c00000000069248c] .__driver_attach+0x11c/0x120
> [c0000005c8817680] [c00000000068f034] .bus_for_each_dev+0x94/0x100
> [c0000005c8817720] [c000000000691624] .driver_attach+0x34/0x50
> [c0000005c88177a0] [c000000000690e88] .bus_add_driver+0x1b8/0x310
> [c0000005c8817840] [c000000000693404] .driver_register+0x94/0x170
> [c0000005c88178c0] [c0000000006954b0] .__platform_register_drivers+0xa0/0x150
> [c0000005c8817980] [800000000075b51c] .mpc85xx_mc_init+0x60/0xd0 [mpc85xx_edac]
> [c0000005c8817a00] [c000000000001a68] .do_one_initcall+0x68/0x1e0
> [c0000005c8817ae0] [c000000000bdb2e8] .do_init_module+0x88/0x24c
> [c0000005c8817b80] [c00000000011961c] .load_module+0x1e3c/0x2840
> [c0000005c8817d20] [c00000000011a320] .SyS_finit_module+0x100/0x130
> [c0000005c8817e30] [c000000000000698] system_call+0x38/0xe8
> Instruction dump:
> 4ba71abd 60000000 7ffff214 4bffff20 2ba50fff 7ca72b78 7cca0734 7c852378
> 40dd0030 2faa0000 394affff 41de0014 <89070000> 38e70001 2fa80000 40fe002c
> ---[ end trace 0000000000000031 ]---

... but please send a v2 without all those hex addresses and offsets as
they're completely meaningless outside of your kernel. I.e., something like:

Call Trace:
 .vsnprintf
 .vscnprintf
 .vprintk_emit
 .printk
 ...

is much more readable. The registers above are not really useful too.
I think you should leave only the gist of the oops so that it is
recognizable by others.

Thanks.

-- 
Regards/Gruss,
    Boris.

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