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From: Guenter Roeck <linux@roeck-us.net>
To: Tobias Klauser <tklauser@distanz.ch>
Cc: Sven Schmidt <4sschmid@informatik.uni-hamburg.de>,
	Sandra Loosemore <sandra@codesourcery.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org, Ley Foon Tan <lftan@altera.com>,
	nios2-dev@lists.rocketboards.org
Subject: Re: nios2 crash/hang in mainline due to 'lib: update LZ4 compressor module'
Date: Thu, 9 Mar 2017 05:20:51 -0800
Message-ID: <4f4fe40b-1e2e-f0b9-37bc-4743fded439d@roeck-us.net> (raw)
In-Reply-To: <20170307124609.GF27998@distanz.ch>

On 03/07/2017 04:46 AM, Tobias Klauser wrote:
[ ... ]

>
> Linux version 4.11.0-rc1-dirty (tobiask@ziws08) (gcc version 7.0.1 20170226 (experimental) (GCC) ) #46 Tue Mar 7 13:40:53 CET 2017
> bootconsole [early0] enabled
> Early console on uart16650 initialized at 0xf8001600
> OF: fdt: Error -11 processing FDT
> Kernel panic - not syncing: setup_cpuinfo: No CPU found in devicetree!
>
> ---[ end Kernel panic - not syncing: setup_cpuinfo: No CPU found in devicetree!
>
> Looks like the in-memory device tree somehow gets corrupted. Not sure
> yet why and how this is linked to the Kconfig options selected but at
> least we now have a possibility to use debug messages earlier on.
>

I think I found the problem. In unflatten_and_copy_device_tree(), with added
debug information:

OF: fdt: initial_boot_params=c861e400, dt=c861f000 size=28874 (0x70ca)

... and then initial_boot_params is copied to dt, which results in corrupted
fdt since the memory overlaps. Looks like the initial_boot_params memory
is not reserved and (re-)allocated by early_init_dt_alloc_memory_arch().

Guenter

  parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-26 21:03 Guenter Roeck
2017-02-27 19:34 ` Sven Schmidt
2017-02-27 20:37   ` Guenter Roeck
2017-02-28 15:53 ` Tobias Klauser
2017-02-28 17:53   ` Sandra Loosemore
2017-02-28 18:14     ` Guenter Roeck
2017-03-01 18:58       ` Sven Schmidt
2017-03-01 19:45         ` Guenter Roeck
2017-03-02 16:38           ` Tobias Klauser
2017-03-03  3:04             ` Guenter Roeck
2017-03-07 12:46               ` Tobias Klauser
2017-03-08  4:12                 ` Guenter Roeck
2017-03-09 13:20                 ` Guenter Roeck [this message]
2017-03-09 14:43                   ` Tobias Klauser
2017-03-09 18:49                     ` Guenter Roeck
2017-03-01 22:50         ` Sandra Loosemore
2017-03-02 13:30           ` Tobias Klauser
2017-02-28 17:57   ` Guenter Roeck

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