linux-kernel - Re: Crash with kfree(null) on MacBook? kobject_set_name

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Date:	Sun, 10 Apr 2011 19:15:58 +0200
From:	Rafał Miłecki <zajec5@...il.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andy Botting <andy@...ybotting.com>
Subject: Re: Crash with kfree(null) on MacBook? kobject_set_name_vargs

W dniu 10 kwietnia 2011 19:14 użytkownik Rafał Miłecki
<zajec5@...il.com> napisał:
> I'm writing new axi bus driver and one of the early testers reported
> it crashing for him. Andy is using MacBook and backtrace+debugging
> pretty clearly point to kfree being called on null string.
>
> The most interesting part of code is:
> axi_info("[axi_register_cores][%d] current name: %s\n", i, core->dev.kobj.name);
> axi_info("[axi_register_cores][%d] calling dev_set_name with %d, %d
> for 0x%03X\n", i, 0/*bus->busnumber*/, dev_id, core->id.id);
> err = dev_set_name(&core->dev, "axi%d:%d", 0/*bus->busnumber*/, dev_id);
> axi_info("[axi_register_cores][%d] dev_set_name result: %d\n", i, err);
>
> The result is:
> [axi_register_cores][1] current name: (null)
> [axi_register_cores][1] calling dev_set_name with 0, 0 for 0x812
> BUG: unable to handle kernel paging request at ffffeba400000000
> IP: [<ffffffff8108c4d4>] kfree+0x2a/0x8a
>
> Whole code: http://pastie.org/1779473
> Whole result: http://pastie.org/1779416
>
> Can you help me with this issue, please? On my machine everything goes fine:
> [axi_register_cores][1] current name: (null)
> [axi_register_cores][1] calling dev_set_name with 0, 0 for 0x812
> [axi_register_cores][1] dev_set_name result: 0
> [axi_register_cores][1] Register dev for core 0x812
>
> bcopeland on #linux-wireless suggested turning on SLAB or SLUB. Is
> this going to provide some interesting info?

Link to kobject_set_name_vargs for lazy ;)
http://lxr.free-electrons.com/source/lib/kobject.c#L215

-- 
Rafał
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