Re: F14: high temperatures after coming back from hibernate

[Ranjan Maitra]

On Fri, 5 Nov 2010 18:55:19 -0500 Gordon Messmer 
wrote:
> On 11/04/2010 05:40 AM, Ranjan Maitra wrote:
> > I have noticed a strange problem after I come back from hibernate and
> > upgrade in F14 on my Thinkpad T61. The temperatures are off the charts,
> > hitting as high as 95C, and staying there, soon after waking up. The
> > laptop has become unusable, basically. Here is the output of top: the
> > topmost processes. Note that the laptop has 4 GB of memory,
> >
> > 1751 maitra    20   0  422m 2232  964 R 99.7  0.1  22:05.74 pulseaudio
>
> It looks like pulseaudio is in some sort of loop.  I'd attach strace to 
> it and see what it's doing.  The PID is 1751, so you'd do something like:
>
> strace -f -s 256 -p 1751
>
> and cancel with Ctrl+C.  You'll probably notice that there are sections 
> of output that simply repeat.  Send a bit back to the list.  It's hard 
> to say whether or not the problem will be apparent, but that'll be a 
> place to start.
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Hi,

Many thanks for your e-mail. It appears that you are right because the
following loops incessantly, and only when I go into pm-hibernate, not
when I go into pm-suspend.

Here is the necessary output:

% top

PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND           
 1589 maitra     9 -11  422m 2176 1048 R 94.9  0.1   8:48.81 pulseaudio

% strace -f -s 256 -p 1589

The following keeps on scrolling:

[pid  1589] ppoll([{fd=5, events=POLLIN}, {fd=21, events=POLLIN}, {fd=9, events=0}, {fd=4, events=POLLIN}, {fd=20, events=POLLIN}, {fd=26, events=POLLIN}, {fd=31, events=POLLIN|POLLERR|POLLHUP}, {fd=31, events=0}, {fd=30, events=POLLIN}, {fd=29, events=POLLIN}, {fd=22, events=POLLIN}, {fd=25, events=POLLIN}, {fd=16, events=POLLIN}, {fd=19, events=POLLIN}, {fd=15, events=POLLIN|POLLERR|POLLHUP}, {fd=15, events=0}, {fd=14, events=POLLIN}, {fd=13, events=POLLIN}, {fd=7, events=POLLIN}], 19, NULL, NULL, 8) = 1 ([{fd=9, revents=POLLHUP}])

Killing pulseaudio (the process) seems to take care of it, and the
temperature cools.

Once again, I am running the F14-LXDE spin.

Many thanks,
Ranjan

F14: high temperatures after coming back from hibernate

[Gordon Messmer]

On 11/08/2010 07:22 PM, Ranjan Maitra wrote:
> % strace -f -s 256 -p 1589
>
> The following keeps on scrolling:
>
> [pid  1589] ppoll([{fd=5, events=POLLIN}, {fd=21, events=POLLIN},
> {fd=9, events=0}, {fd=4, events=POLLIN}, {fd=20, events=POLLIN},
> {fd=26, events=POLLIN}, {fd=31, events=POLLIN|POLLERR|POLLHUP},
> {fd=31, events=0}, {fd=30, events=POLLIN}, {fd=29, events=POLLIN},
> {fd=22, events=POLLIN}, {fd=25, events=POLLIN}, {fd=16,
> events=POLLIN}, {fd=19, events=POLLIN}, {fd=15,
> events=POLLIN|POLLERR|POLLHUP}, {fd=15, events=0}, {fd=14,
> events=POLLIN}, {fd=13, events=POLLIN}, {fd=7, events=POLLIN}], 19,
> NULL, NULL, 8) = 1 ([{fd=9, revents=POLLHUP}])
>
> Killing pulseaudio (the process) seems to take care of it, and the
> temperature cools.

It's important to be exact here.  That is a single line from the output 
of strace.  Is every single line of output identical?  Do they all end 
with "= 1 ([{fd=9, revents=POLLHUP}])"?

If so, that indicates that pulseaudio has lost connection to something 
which was attached to file descriptor 9.  It's not clear to me where 
this bug is.

First, I would assume that any time that pulseaudio gets HUP on one of 
its fds, it should close that fd and stop polling it.

However, pulseaudio is polling fd 9 with no "events" requested.  In that 
case, I believe that either glibc or Linux (the kernel) is at fault.  No 
events should be returned for that fd.  The documentation isn't 
perfectly clear on what actually happens when no events are specified, 
so this may be a bug or it may not be.