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

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Date:	Wed, 21 Apr 2010 10:42:45 +0300
From:	Paweł Sikora <pluto@...k.net>
To:	"Yann Droneaud" <yann@...neaud.fr>
Cc:	libc-help@...rceware.org, "Mike Frysinger" <vapier@...too.org>,
	linux-kernel@...r.kernel.org
Subject: Re: mprotect() failed: Cannot allocate memory

Dnia 21-04-2010 o 11:22:19 Yann Droneaud <yann@...neaud.fr> napisał(a):

>> (...)
>> mmap(NULL, 4896, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0)  
>> =
>> 0x7f5fd97df000
>> mprotect(0x7f5fd97df000, 4096, PROT_NONE) = -1 ENOMEM (Cannot allocate  
>> memory)
>
> Have you checked available memory on your system ? Or user limit ?
>
> You test program is going to allocate
>  79 + 1 pages for bm
>  1 + 1 for each double arrays (x 40000)
>
> So in the end your program is allocating 80080 pages, so about
> 312MBytes.
>
> It not that big for a 64bits system.

afaics in gdb, the mprotect fails at i=32756. it's near to 2^15.
maybe some kernel data structures are full?
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