Am Dienstag, 31. Dezember 2013, 13:52:05 schrieb Martin Steigerwald:

Am Dienstag, 31. Dezember 2013, 13:41:22 schrieb Martin Steigerwald:

quoted

Am Samstag, 30. November 2013, 14:53:51 schrieb Martin Steigerwald:

quoted

Just added linux-mmc. And I might git-bisect that at some time, but I do
not intend to do it during my precious weekend. The chances of me
bisecting it increase with workable suggestions on how to cut down the
amount of iterations needed and avoid testing highly experimental
between
3.12 and 3.13-rc1 kernels on a production laptop. I may be willing to
test a patch or two. As I see there seem to have been quite some changes
in MMC subsystem.




Hi!

Just does that on a ThinkPad T520 with:

merkaba:~> lspci -nn | grep MMC
0d:00.0 System peripheral [0880]: Ricoh Co Ltd PCIe SDXC/MMC Host
Controller [1180:e823] (rev 08)

Mouse pointer freezes, no Ctrl-Alt-F1.

It just does that with

Linux version 3.13.0-rc6-tp520 (martin@merkaba) (gcc version 4.8.2 (Debian
4.8.2-10) ) #41 SMP PREEMPT Mon Dec 30 13:39:07 CET 2013

as well.

I missed some important data. Kernel runs with threadirqs:

merkaba:~> cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-3.12.6-tp520
root=UUID=2f5c334d-249b-4c89-95cc-18572f750bd7 ro rootflags=subvol=root
resume=/dev/mapper/merkaba-swap threadirqs i915_enable_rc6=7

Oh, and I see i915_enable_rc6=7. This always worked flawlessly. But maybe
this changed? Cause according to powertop the GPU never entered deeper
sleep states anyway. Maybe this now works (and thus may hang)?

These are values on 3.12.6:
                    |             GPU     |
                    | 
                    | Powered On 96,3%    |
                    | RC6         3,7%    |
                    | RC6p        0,0%    |
                    | RC6pp       0,0%    |

I also attach kernel configs of non working 3.13-rc6 and working 3.12.6
kernels.

Its a ThinkPad T520 with Sandybridge:

merkaba:~> lspci -nn | grep VGA
00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation
Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09)

Debian kernel packages available. But well… optimized for ThinkPad T520, may
not run nicely otherwere.


Please give suggestions on what to try next. Whats comes to mind is tryining
without rc6_enable option and then without threadirq option.

Any other idea?

So there we go:

1) Without kernel options (except resume option) copying works in desktop.

2) But then otherwise as I expected: With just "threadirqs" kernel option it 
hangs. I would have suspected the "i915_enable_rc6" option instead.

3) But only when triggering copy via KDE desktop dolphin´s file manager. I 
tried copying on tty1 again and no hang there. Also again I/O seemed to go on 
after mouse pointer freeze (without Ctrl-Alt-F1) working. kwin ran in 
compositing mode.

4) With just "i915_enable_rc6=7" it works. But since according to powertop 
that option doesn´t give me the benefit of doing into deeper GPU sleep states 
anyway, I removed that one now as well.


So my laptop is on 3.13-rc6 now without any special options and I learned 
again:

Never try to tune the kernel :)

And if still tuning it: First remove any kernel option when facing any issue. 
Sorry for the noise that not adhering to this has caused.


This is second time that threadirqs option caused problems here. Thus CCing 
rt-users mailing list as well.

If wished I compile this all into a bugzilla.kernel.org bug report in a 
concise format as well. But thats for another day :)

Have a good shift into new year if not already in it… otherwise a happy new 
year,
Martin

Ciao,
Martin

quoted

But, only when trying to write a file via desktop environment via dolphin
from KDE in that case. When I am on tty1 it seems to be stable to write to
the SD card. But with dolphin on writing a large few files vom /usr/bin
mouse pointer froze again. But according to harddisk led from ThinkPad
T520
there has been some write activity afterwards. The LED also lits up for
MMC
card accesses. Still after reboot there is none of the copied files
visible
on the FAT32 formatted SD card.

Thus adding Intel gfx and dri devel lists to CC.


This crashing only under GUI might still be a coindidence. I only tried
once. But since the crash usually came almost immediately and it didn´t
crash with reading or writing files on TTY1 and it somehow continued I/O
according to harddisk led instead of seeming to be completely stopped…
well
I can try again to make sure. Would be good to make it crash on TTY1 since
then I might see some kernel output.


Back to 3.12.6 for now. I just tried the same with that kernel and there
the copying just works nice.

I can also report a bug at bugzilla.kernel.org if needed.


May comments about bisecting still applies. I do not feel comfortable with
doing it on this production machine with production data on it… especially
given the major block layer changes. There may be points in history were
the kernel produces data corruption or so.

Thanks,
Martin

quoted

merkaba:~> fdisk -l /dev/mmcblk0

Disk /dev/mmcblk0: 31.4 GB, 31439454208 bytes
255 heads, 63 sectors/track, 3822 cylinders, total 61405184 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

        Device Boot      Start         End      Blocks   Id  System

/dev/mmcblk0p1            8192    61405183    30698496    c  W95 FAT32
(LBA


merkaba:/sys/block/mmcblk0#2> grep . * 2>/dev/null
alignment_offset:0
capability:10
dev:179:0
discard_alignment:0
ext_range:8
force_ro:0
inflight:       0        0
range:8
removable:0
ro:0
size:61405184
stat:     176       33     1672      102        0        0        0
0 0      102      102
uevent:MAJOR=179
uevent:MINOR=0
uevent:DEVNAME=mmcblk0
uevent:DEVTYPE=disk


I do not want to take the time to diagnose this further, especially as
its
one of those nasty "I just lock up and I don´t tell you what went wrong"
kind of bugs. Thats just not a nice way to tell that there has been an
error.


If there is any five or ten minute information gathering task, I am
willing
to provide more information, but right now there is no chance on Earth
that
I will be bisecting while having a long list of more interesting things
to
do than that.


Thus for now I just use 3.12 kernel again. Maybe I will try with some
rc5
or so again.

Ciao,

-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7