Re: [PATCH 2.6.18-rc4 00/10] Kernel memory leak detector 0.9

From: Michal Piotrowski
Date: Fri Aug 18 2006 - 18:47:28 EST

On 18/08/06, Catalin Marinas <catalin.marinas@xxxxxxxxx> wrote:
On 18/08/06, Michal Piotrowski <michal.k.k.piotrowski@xxxxxxxxx> wrote:
> cat /sys/kernel/debug/memleak + LTP + patching repo = oops?
> BUG: unable to handle kernel paging request at virtual address 6b6b6b6b

I got this as well today on an 4-CPU ARM platform. I changed some list
traversal to the RCU variants but forgot to change the list_del/add. I
attach another patch which fixes this (haven't tested it extensively


I just added your "Fix memory leak in vc_resize/vc_allocate" patch to
my series file.

orphan pointer 0xc6110000 (size 12288):
c017480e: <__kmalloc>
c024dda4: <vc_resize>
c020ed9c: <fbcon_startup>
c0251028: <register_con_driver>
c02511e0: <take_over_console>
c020e21e: <fbcon_takeover>
c0212b08: <fbcon_fb_registered>
c0212ce1: <fbcon_event_notify>
orphan pointer 0xf55b0000 (size 8208):
c017480e: <__kmalloc>
c0211bb8: <fbcon_set_font>
c0251b17: <con_font_set>
c0251c7b: <con_font_op>
c0249a97: <vt_ioctl>
c024432e: <tty_ioctl>
c0189fd1: <do_ioctl>
c018a269: <vfs_ioctl>

This is interesting. Is it too large?
orphan pointer 0xfe09f000 (size 4194304):
c016cb9c: <__vmalloc_node>
c016cbb2: <__vmalloc>
c016cbc7: <vmalloc>
fdd3bbe1: <txInit>
fdd23b73: <init_jfs_fs>
c0149fea: <sys_init_module>

A simple way to reproduce:

while true
sudo mount -o loop -t jfs /home/fs-farm/jfs.img /mnt/fs-farm/jfs/
sudo umount /mnt/fs-farm/jfs/

A large collection of false positives :)




Michal K. K. Piotrowski
LTG - Linux Testers Group
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