linux-kernel - [REGRESSION] SLAB allocator (on Zynq)

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Date:	Wed, 8 May 2013 12:20:41 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Michal Simek <michal.simek@...inx.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>
CC:	Sören Brinkmann <soren.brinkmann@...inx.com>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-mm@...ck.org>
Subject: [REGRESSION] SLAB allocator (on Zynq)

Hi,

I compiled the latest kernel for Zynq and ran into issues when the SLAB
allocator is selected. Booting crashes early with a NULL pointer
dereference (boot log attached).
Switching to the SLUB allocator resolves the issue (boot log attached).

I tried bisecting the issue with the following result:
	There are only 'skip'ped commits left to test.
	The first bad commit could be any of:
	ca34956b804b7554fc4e88826773380d9d5122a8
	ce8eb6c424c794d7fb4d1a6667d267990ca28072
	2c59dd6544212faa5ce761920d2251f4152f408d
	c601fd6956e92b0eb268d4af754073c76155b99d
	9e5e8deca74603357626471a9b44f05dea9e32b1
	db8450673458e724229e91050ac9a92253b01234
	b1e0541674904db00e17ce646b0a1d54f59136a5
	f97d5f634d3b5133951424fae751db1f339548bd
	7d557b3cb69398d83ceabad9cf147c93a3aa97fd
	9425c58e5445277699ff3c2a87bac1cfebc1b48d
	633b076464da52b3c7bf0f62932fbfc0ea23d8b3
	95a05b428cc675694321c8f762591984f3fd2b1e
	338b2642290ef3193229ece8cfc776ac4fe8869d
	6a67368c36e2c0c2578ba62f6264ab739af08cce
	4d7868e6475d478172581828021bd8a356726679
	6744f087ba2a49f6d6935d9daa0b20a0f03567b5
	7cccd80b4397699902aced1ad3d692d384aaab77
	e33660165c901d18e7d3df2290db070d3e4b46df
	14e50c6a9bc2b283bb4021026226268312ceefdd
	ce6a50263d4ddeba1f0d08f16716a82770c03690
	345046673449b5c35840e5cc34a60059cbec9305
	6286ae97d10ea2b5cd90532163797ab217bfdbdf
	31ba7346f082f3468b8e06b45db475a6e25f01fc
	8a965b3baa89ffedc73c0fbc750006c631012ced
	69df2ac1288b456a95aceadafbf88cd891a577c8
	We cannot bisect more!

The skipped commits failed to compile.

I also attach my kernel config.

	Thanks,
	Sören


View attachment "boot-slab.log" of type "text/plain" (7319 bytes)

View attachment "boot-slub.log" of type "text/plain" (10236 bytes)

View attachment "config-slab" of type "text/plain" (63257 bytes)