----- Original Message ----
From: Matt Domsch <Matt_Domsch@xxxxxxxx>
To: Community support for Fedora users <users@xxxxxxxxxxxxxxxxxxxxxxx>
Sent: Mon, April 12, 2010 1:28:37 PM
Subject: Re: What is in include/linux/kernel.h line 158
On Sat, Apr 10, 2010 at 01:29:08PM -0700, Antonio Olivares wrote:
> Dear folks,
>
> I have encountered this so called sleeping function several times in a good while (kernel 2.6.27, 2.6.29, 2.6.30, 2.6.31, 2.6.32) Fedora based kernels and compiled kernels from kernel.org,
>
> I am asking this because I see this again and again. I would like to know what is in there so if I can do something about it, or just live with it since it appears to be harmless, but anyhow it is annoying :(
>
> BUG: sleeping function called from invalid context at include/linux/kernel.h:158
> in_atomic(): 0, irqs_disabled(): 1, pid: 9713, name: slmodemd
> Pid: 9713, comm: slmodemd Tainted: P 2.6.32.10-90.fc12.i686.PAE #1
> Call Trace:
> [<c043372f>] __might_sleep+0xca/0xd1
> [<c05c6c3a>] might_fault+0x19/0x20
> [<c05c6d8e>] copy_to_user+0x34/0x10a
> [<fe2b32ca>] amrmo_read+0x50/0x66 [slamr]
> [<fe2b327a>] ? amrmo_read+0x0/0x66 [slamr]
> [<c04e15fc>] vfs_read+0x82/0xe1
> [<c04e9d17>] ? path_put+0x1a/0x1d
> [<c04e16f9>] sys_read+0x40/0x62
> [<c040907b>] sysenter_do_call+0x12/0x28
The source code to the slamr module (amrmo_read() function) is not
present in Fedora or kernel.org. The BUG message is complaining that
something (the amrmo_read() function) has disabled interrupts (the
irqs_disabled(): 1 part of the message), while at the same time
calling a function (copy_to_user()) which can sleep (the process could
be unscheduled or mapped out at the moment copy_to_user() is called),
so you could wind up deadlocked (interrupts off so nothing to wake the
scheduler back up).
This is a bug in the slamr driver.
Thanks,
Matt
--
Matt Domsch
Technology Strategist
Dell | Office of the CTO
--
Thank you Matt. Yair from linmodems.org mailing list explained it carefully. I guess there is no choice but to live with it :(
Smartlink no longer makes modems, but is still closed source, can't win them all :(
Regards,
Antonio
--
users mailing list
users@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe or change subscription options:
https://admin.fedoraproject.org/mailman/listinfo/users
Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
