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List:       uclinux-dev
Subject:    [uClinux-dev] malloc() bug
From:       Amit Shah <shahamit () gmx ! net>
Date:       2003-05-30 10:12:50
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Hi all,

I'm porting uClinux and uClibc to a new arch.. this is a system with 2MB memory.

When I keep doing some malloc()s from a userspace program, I get the following bug:


5: successfully allocated one chunk of size 65536 
do_mmap: 
Process blocks 1: 000060fc: 00000000 -> 000cb620: 000cb640 (131072 @00120000 #1) 
 -> 000cb5c0: 000cb5e0 (131072 @00140000 #1) -> 000cb560: 000cb580 (131072 @0016 
0000 #1) -> 000cb500: 000cb520 (131072 @00180000 #1) -> 000cb4a0: 000cb4c0 (1310 
72 @001a0000 #1) -> 000cb440: 000cb460 (4096 @00007000 #1) -> 000cb3e0: 000cb400 
 (131072 @001c0000 #1) -> 000cb380: 000cb3a0 (131072 @001e0000 #1) -> 000cb320: 
000cb340 (32768 @000b0000 #1). 
Kernel BUG in file buffer.c: function __put_unused_buffer_head: line 1142! 
Kernel panic: BUG!

The system has already allocated 5*64k chunks.

If I increase the chunk size to 128 or 256, I don't see this bug (it is
reporducible with 64k size), the kernel doesn't allocate RAM, even if it
has free memory. A dump of such a situation is produced below:

Allocation of length 135168 from process 1 failed
Buffer memory:       12kB
Cache memory:       48kB
Free pages:         316kB (     0kB HighMem)
Zone:DMA freepages:     0kB min:     0kB low:     0kB high:     0kB
Zone:Normal freepages:   316kB min:    80kB low:   160kB high:   240kB
Zone:HighMem freepages:     0kB min:     0kB low:     0kB high:     0kB
( Active: 15, inactive: 0, free: 79 )
= 0kB)
3*4kB 4*8kB 1*16kB 0*32kB 0*64kB 0*128kB 1*256kB 0*512kB 0*1024kB 0*2048kB = 316
kB)
= 0kB)
Kernel panic: Out of memory and no killable processes...

(No killable process, 'cos this is my init)

Any suggestions to these problems?

Thanks,
Amit.
-- 
Amit Shah
http://amitshah.nav.to/

A: No.
Q: Should I include quotations after my reply?

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