https://bugzilla.novell.com/show_bug.cgi?id=743101 https://bugzilla.novell.com/show_bug.cgi?id=743101#c1 Guy Zelck changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |guy.zelck@telenet.be --- Comment #1 from Guy Zelck 2012-01-24 22:38:11 UTC --- I'm waiting for almost a year now just for opensuse to package a more recent kernel (>= 2.6.38) than the 2.6.37.x of the 11.4 distribution. The bug in 714455 is solved.So, good luck 8-(. Can you vote for my bug, maybe that will draw their attention. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=743101 https://bugzilla.novell.com/show_bug.cgi?id=743101#c3 Steve Revilak changed: What |Removed |Added ---------------------------------------------------------------------------- Priority|P5 - None |P2 - High CC| |steve@srevilak.net --- Comment #3 from Steve Revilak 2012-02-05 03:12:29 UTC --- I'm having a similar problem with 12.1 (i386) on a Lenovo ThinkPad R400. After reboot, one kworker process will completely utilize one core (and occassionally two kworker processes will completely utilize two cores). After 5-10 minutes the kworker processes become idle. uname for this system is Linux mylaptop 3.1.9-1.4-desktop #1 SMP PREEMPT Fri Jan 27 08:55:10 UTC 2012 (efb5ff4) i686 i686 i386 GNU/Linux Unlike comment #1, I see no mention of acpi in /var/log/messages. I'd love to help get this issue resolved, and I'd be happy to provide any additional information. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=743101 https://bugzilla.novell.com/show_bug.cgi?id=743101#c4 Joey Lee changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |NEEDINFO InfoProvider| |aspiers@suse.com --- Comment #4 from Joey Lee 2012-03-15 01:48:55 UTC --- Please kindly provide the following information: #acpidump > acpidump.dat #/var/log/boot.msg #dmesg > dmesg.log Thanks a lot! -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=743101 https://bugzilla.novell.com/show_bug.cgi?id=743101#c6 Steve Revilak changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEEDINFO |NEW InfoProvider|aspiers@suse.com | --- Comment #6 from Steve Revilak 2012-03-27 02:50:35 UTC --- I can provide the information requested in Comment 4. (Note, boot.msg is taken from a different boot than acpidump.dat and dmesg.log; I'd inadvertently collected boot.log instead of boot.msg). -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=743101 https://bugzilla.novell.com/show_bug.cgi?id=743101#c8 --- Comment #8 from Steve Revilak 2012-03-27 02:52:04 UTC --- Created an attachment (id=483344) --> (http://bugzilla.novell.com/attachment.cgi?id=483344) copy of /var/log/boot.msg -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=743101 https://bugzilla.novell.com/show_bug.cgi?id=743101#c10 --- Comment #10 from Michael Chang 2012-03-30 07:13:28 UTC --- Steve, Did you need dock to reproduce it? Just in case that they are similar symptom but complete different root cause. It would be interested to see output of "perf top" when kworker hugs cpu with 100%. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=743101 https://bugzilla.novell.com/show_bug.cgi?id=743101#c11 --- Comment #11 from Steve Revilak 2012-03-31 01:16:03 UTC --- Michael, No, I didn't need a dock to reproduce this condition (high CPU consumption by kworker processes). I agree -- it is possible that I am seeing similar symptoms from a different root cause. I've just installed the perf package, and I will get you a set of ``perf top'' output. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=743101 https://bugzilla.novell.com/show_bug.cgi?id=743101#c13 --- Comment #13 from Steve Revilak 2012-04-03 13:22:51 UTC --- In response to comment 10: I'm providing perf-top.txt. This is a set of "perf top" output, taken while one kworker process was monopolizing a CPU core. In response to comment 12: I am using OpenSUSE 12.1. uname tells me that the kernel is 3.1.9-1.4-desktop. r8192se_pci is the driver for my laptop's RealTEK wireless chipset. I believe this is the kernel oops that you are referring to <4>[ 13.393887] WARNING: at /usr/src/linux-2.6.37.6-0.11/include/linux/netdevice.h:1560 rtl8192_pci_probe+0x370/0x5ee [r8192se_pci]() This is interesting. When using 2.6 kernels (OpenSUSE 11.3 and 11.4), I had to compile the vendor's wireless drivers. When upgrading to OpenSUSE 12.1 (and the 3.1 kernel), the wireless "just worked"; I assumed that RTL8192SE support was added in the 3.1 kernel release. The warning message looks like my 3.1 kernel picking up a driver that was compiled for a 2.6 kernel. I will try blacklisting r8192se_pci and testing again. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=743101 https://bugzilla.novell.com/show_bug.cgi?id=743101#c15 --- Comment #15 from Michael Chang 2012-04-05 04:37:02 UTC --- (In reply to comment #14)

Output from "perf top"

i915 seems to be the culprit, get_clock spent cpu much more cycles than others. Take a bit look at the kernel source, get_clock seems to be related with intel gmbus, which is used to display detection/hotplug function based on i2c protocol. Can't tell too much what's going wrong due to lack of knowledge. 1. If you could provide more info related with your connected display would be great .. for eg, did you plug an external monitor when booting ? 2. Try kotd .. form "git log drivers/gpu/drm/i915/intel_i2c.c" seems to have many fixes related with gmbus recently. http://en.opensuse.org/openSUSE:Kernel_of_the_day 3. Possible to blacklist i915 and use runlevel 3 to see if it happen or not? (not sure systemd's step to do this, suppose same with init .. I'll post the step for your reference once I know howto do it on 12.1) Thanks. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=743101 https://bugzilla.novell.com/show_bug.cgi?id=743101#c17 --- Comment #17 from Steve Revilak 2012-04-07 02:51:35 UTC --- Thanks for all of the suggestions; I really appreciate them. You've given me lots of things to test, and I will try to work through the list. Regarding the rtl8192_pci kernel oops, I started by moving all of the 2.6 modules aside: sudo mkdir /modules.OLD sudo mv /lib/modules/2.6.* /modules.OLD/ And verifying that all rtl8192 files are part of my kernel distribution.

find /lib/modules/3.1.9-1.4-desktop/ -name rtl8192\*.ko /lib/modules/3.1.9-1.4-desktop/kernel/drivers/net/wireless/rtlwifi/rtl8192c/rtl8192c-common.ko /lib/modules/3.1.9-1.4-desktop/kernel/drivers/net/wireless/rtlwifi/rtl8192se/rtl8192se.ko /lib/modules/3.1.9-1.4-desktop/kernel/drivers/net/wireless/rtlwifi/rtl8192cu/rtl8192cu.ko /lib/modules/3.1.9-1.4-desktop/kernel/drivers/net/wireless/rtlwifi/rtl8192ce/rtl8192ce.ko /lib/modules/3.1.9-1.4-desktop/kernel/drivers/net/wireless/rtlwifi/rtl8192de/rtl8192de.ko

find /lib/modules/3.1.9-1.4-desktop/ -name rtl8192\*.ko | xargs -n1 rpm -qf kernel-desktop-3.1.9-1.4.1.i586 kernel-desktop-3.1.9-1.4.1.i586 kernel-desktop-3.1.9-1.4.1.i586 kernel-desktop-3.1.9-1.4.1.i586 kernel-desktop-3.1.9-1.4.1.i586

boot.msg still shows the same kernel oops. Next, I added "blacklist r8192se_pci" to /etc/modprobe.d/99-local.conf and rebooted. Upon reboot, my laptop's wireless no longer worked (expected), but it was only a few minutes before kworker started consuming most of one CPU core. Here is "perf top" taken while kworker was monopolizing the CPU. PerfTop: 45 irqs/sec kernel:82.2% exact: 0.0% [1000Hz cycles], (all, 2 CPUs) ------------------------------------------------------------------------------------------- samples pcnt function DSO _______ _____ ______________________ ______________ 597.00 69.5% get_clock [i915] 73.00 8.5% delay_tsc [kernel] 58.00 6.8% read_hpet [kernel] 12.00 1.4% mark_object emacs 9.00 1.0% _raw_spin_lock_irqsave [kernel] 8.00 0.9% acpi_os_read_port [kernel] 7.00 0.8% i8042_interrupt [kernel] 6.00 0.7% strlen libc-2.14.1.so 5.00 0.6% critical_factorization libc-2.14.1.so This occurred in runlevel 5. I'm NOT using any external hardware with my laptop (monitor, keyboard, mouse, etc). Next, I tried booting into runlevel 3, still with rtl9192se_pci blacklisted. cd /etc/systemd/system sudo mv default.target default.target.OLD sudo ln -s /lib/systemd/system/runlevel3.target default.target sudo reboot I used my laptop for several hours in this configuration (I needed to do some writing ... but emacs is happy to work in runlevel 3). The kworker process never monopolized the CPU. Normally, that would have happened at least once. Unfortunately, turning of wireless and X11 does limit the utility of my laptop. Next, I'll try kernel of the day. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=743101 https://bugzilla.novell.com/show_bug.cgi?id=743101#c19 Rafael Wysocki changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |NEEDINFO InfoProvider| |steve@srevilak.net --- Comment #19 from Rafael Wysocki 2012-06-14 20:25:01 UTC --- Good. Would it be practical for you to keep using that kernel going forward? -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=743101 https://bugzilla.novell.com/show_bug.cgi?id=743101#c22 Rafael Wysocki changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |WORKSFORME --- Comment #22 from Rafael Wysocki 2012-06-15 19:13:04 UTC --- Please let me mark this bug as resolved, then. While it would be useful to know which commit fixed the issue for you, I don't think it's worth the time we'd need to spend on finding it. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.