[SSI-devel] [ ssic-linux-Bugs-1764324 ] Badness in sk_del_node_init at include/net/sock.h:343

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Bugs item #1764324, was opened at 2007-07-31 13:27
Message generated for change (Comment added) made by hughesj
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Category: Process Management
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Badness in sk_del_node_init at include/net/sock.h:343

Initial Comment:
Hi,

On debian 1.9.3 when i start up my applications which involve heavy shared memory usage and network usage i constantly get this on the non-init-nodes until they freeze:

Badness in sk_del_node_init at include/net/sock.h:343
 [<c01068be>] dump_stack+0x1e/0x30
 [<c0412de9>] __unix_remove_socket+0x69/0x70
 [<c0413204>] unix_release_sock+0x24/0x300
 [<c041384a>] unix_release+0x3a/0x90
 [<c039bdc9>] sock_release+0x79/0xc0
 [<c039ca44>] sock_close+0x34/0x50
 [<c016c791>] __fput+0x121/0x140
 [<c016c669>] fput+0x19/0x20
 [<c016acf7>] filp_close+0x57/0x90
 [<c016ad9e>] sys_close+0x6e/0x90
 [<c010596b>] syscall_call+0x7/0xb


There was someone here http://www.ussg.iu.edu/hypermail/linux/kernel/0411.2/0735.html
had experienced the same on SELinux.

-niklas


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Comment By: John Hughes (hughesj)
Date: 2007-08-02 10:40

Message:
Logged In: YES 
user_id=166336
Originator: NO

1. If you're using my repository just apt-get-install
kernel-image-2.6.11-ssi-686-smp to get 2.6.11 (ssi 1.9.3 prerelease)
2. You're using Unix domain sockets?
3. SYSV shared memory?

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Comment By: Nobody/Anonymous (nobody)
Date: 2007-08-02 07:21

Message:
Logged In: NO 

Hi,

I guess it is an error I get when a process using a socket tries to
migrate, or at least it is related to it somehow.

Easily reproduced on my system but I dont know any easy general way to
reproduce it.

The applications I use consist of perl-scripts controlling daemons that
capture pictures and other daemons analyzing them and writing pictures to
disk. One capturing daemon can easily use a block of 100M shared memory and
the analyzing daemons analyzes the data in the same space.

I will see if there is something I can do on application level, eg. to
have daemons started on different nodes to even out load and then not
allowing migrating. I will also try the 2.6.11 kernel. I just couldnt yet
figure out how to do it but I will soon.


I also get lots of these errors:
kernel: reop_export_path: Can't export unlinked file /SYSV7a6d2001
(deleted)


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Comment By: John Hughes (hughesj)
Date: 2007-07-31 15:08

Message:
Logged In: YES 
user_id=166336
Originator: NO

I assume you're talking about the repository at
www.atlantech.com/~john/openssi-debian-1.9.3?

Could you try with the 2.6.11 kernel?

You say "heavy shared memory usage and network usage" any way of
quantifying that?

Any simple recepie for duplicating the problem?



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Comment By: Nobody/Anonymous (nobody)
Date: 2007-07-31 14:58

Message:
Logged In: NO 

Hi,

Made some more research. This comes when a process tries to migrate and
sometimes it comes in relation to 
reop_export_path: Can't export unlinked file /SYSV6d2012 (deleted)


This is on debian sarge, openssi 1.9.3 debs, kernel 2.6.10

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