linux-kernel - Re: mprotect() failed: Cannot allocate memory

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Date:	Wed, 21 Apr 2010 12:42:40 +0300
From:	Paweł Sikora <pluto@...k.net>
To:	"Peter Zijlstra" <peterz@...radead.org>
Cc:	libc-help@...rceware.org, linux-kernel@...r.kernel.org
Subject: Re: mprotect() failed: Cannot allocate memory

Dnia 21-04-2010 o 13:16:50 Peter Zijlstra <peterz@...radead.org>  
napisał(a):

> On Wed, 2010-04-21 at 01:05 +0200, Paweł Sikora wrote:
>> hi,
>>
>> i'm trying to debug an ugly application with ElectricFence.
>> in fact, on x86-64 box with 8GB ram and 16GB swap i'm getting following  
>> error:
>>
>> "ElectricFence Exiting: mprotect() failed: Cannot allocate memory"
>>
>> the program has been compiled with gcc-4.5, glibc-2.11.1, kernel-2.6.32.
>> did you ever come across such (kernel/glibc) limitations?
>>
>> here's a simple testcase which triggs -ENOMEM in mprotect().
>
> You probably depleted the max map count, see:
>   /proc/sys/vm/max_map_count

yes, that is the clue :)

the limit in /proc/sys/vm/max_map_count was set to 65530.
with `echo 128000 > /proc/sys/vm/max_map_count` the testcase passes.

thanks for hint.
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