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From: Tobias Klauser <>
To: Guenter Roeck <>
Cc: Sven Schmidt <>,
	Arnd Bergmann <>,
	Andrew Morton <>,, Ley Foon Tan <>,,
	Sandra Loosemore <>
Subject: Re: nios2 crash/hang in mainline due to 'lib: update LZ4 compressor module'
Date: Tue, 28 Feb 2017 16:53:31 +0100
Message-ID: <> (raw)
In-Reply-To: <>

(adding Sandra Loosemore to Cc due to possible relation to gcc/binutils
for nios2)

On 2017-02-26 at 22:03:38 +0100, Guenter Roeck <> wrote:
> Hi Sven,
> my qemu test for nios2 started failing with commit 4e1a33b105dd ("lib:
> update LZ4 compressor module"). The test hangs early during boot before
> any console output is seen. Reverting the offending patch as well as the
> subsequent lz4 related patches fixes the problem. Disabling CONFIG_RD_LZ4
> and with it other LZ4 options also fixes it (as does adding "return -EINVAL;"
> at the top of the LZ4 decompression code). For reference, bisect log
> is attached.
> I tried with buildroot toolchains using gcc 6.1.0 as well as 6.3.0
> and binutils 2.26.1. Scripts used to run the tests are available at
> Qemu is from qemu mainline or qemu v2.8 with nios2 patches applied.

Looks like this is somehow related to gcc/binutils. Using GCC 4.8.3 and
binutils 2.24.51 (both from from Sourcery CodeBench Lite 2014.05) I can
get a kernel booting on latest master branch. AFAICT, none of the
LZ4_decompress_* functions are called during boot.

However, using a self-built GCC 7.0 (20161127) and binutils 2.27 I can
reproduce the problem you see using the instructions Guenter provided in
the reply to Sven.

I'll try to dig a bit deeper from here on. Any suggestions on what to
look out for wrt the differences between the gcc/binutils version are
welcome of course.


  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 [this message]
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
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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