[SOLVED] Linux kernel 3.9.2-1 bug - hp_wmi dmesg errors (hp nx9420)

My laptop is hp nx9420, the RAM and hard drive are pretty much new and are surely fine, and I'm using 64-bit Arch. The No Execute bit has always been enabled.
Upon upgrading my system, which pulled the kernel package linux-3.9.2-1, and after a reboot, there were problems regarding the boot process and it appears it's a bug connected with hp-wmi. Also, my system can't properly unmount the root partition and reboot/shutdown.
Part of dmesg
[ 6.218925] ------------[ cut here ]------------
[ 6.218982] kernel BUG at net/rfkill/core.c:244!
[ 6.219024] invalid opcode: 0000 [#1] PREEMPT SMP
[ 6.219085] Modules linked in: iTCO_vendor_support mac80211 yenta_socket(+) tg3 hp_wmi(+) snd_hda_intel(+) ptp lpc_ich snd_hda_codec sparse_keymap pps_core cfg80211 microcode snd_hwdep pcmcia_rsrc libphy snd_pcm pcmcia_core pcspkr evdev hp_accel psmouse serio_raw lis3lv02d rfkill input_polldev snd_page_alloc snd_timer fan snd intel_agp intel_gtt soundcore thermal ac wmi video button battery acpi_cpufreq mperf tpm_tis(+) tpm tpm_bios processor sg ext4 crc16 mbcache jbd2 hid_a4tech usbhid hid sd_mod ata_generic pata_acpi ahci libahci ata_piix libata scsi_mod ehci_pci uhci_hcd ehci_hcd usbcore usb_common radeon i2c_algo_bit drm_kms_helper ttm drm i2c_core
[ 6.219946] CPU 0
[ 6.219970] Pid: 134, comm: systemd-udevd Not tainted 3.9.2-1-ARCH #1 Hewlett-Packard HP Compaq nx9420 (RH442ET#ABD)/309F
[ 6.220062] RIP: 0010:[<ffffffffa05897af>] [<ffffffffa05897af>] rfkill_set_hw_state+0x9f/0xb0 [rfkill]
[ 6.220150] RSP: 0018:ffff88007af6fb60 EFLAGS: 00010246
[ 6.220196] RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000018
[ 6.220255] RDX: 0000000000061b00 RSI: 0000000000000001 RDI: 0000000000000000
[ 6.220313] RBP: ffff88007af6fb80 R08: 0000000000016fa0 R09: ffff88007f616fa0
[ 6.220371] R10: ffffea0001e98780 R11: ffffffffa07170ee R12: ffff88007c3bfc10
[ 6.220429] R13: ffff88007c3bfc00 R14: 0000000000000000 R15: ffffffffa0718560
[ 6.220489] FS: 00007f9d419ca780(0000) GS:ffff88007f600000(0000) knlGS:0000000000000000
[ 6.220556] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 6.220604] CR2: 0000000001f7c000 CR3: 000000007af0a000 CR4: 00000000000007f0
[ 6.220663] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 6.220721] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 6.220781] Process systemd-udevd (pid: 134, threadinfo ffff88007af6e000, task ffff88007c3e8860)
[ 6.220850] Stack:
[ 6.220870] 0000000000000000 ffff88007c3bfc10 ffff88007c3bfc00 0000000000000000
[ 6.220954] ffff88007af6fbb0 ffffffffa071a25a 0602122900000022 ffff88007c3bfc10
[ 6.221036] ffffffffa0718428 ffff88007c3bfc00 ffff88007af6fbe0 ffffffff8135978c
[ 6.221120] Call Trace:
[ 6.221151] [<ffffffffa071a25a>] hp_wmi_bios_setup+0x25a/0x3a0 [hp_wmi]
[ 6.221213] [<ffffffff8135978c>] platform_drv_probe+0x3c/0x70
[ 6.221266] [<ffffffff81356d6a>] ? driver_sysfs_add+0x7a/0xb0
[ 6.221325] [<ffffffff81357407>] driver_probe_device+0x87/0x3a0
[ 6.223365] [<ffffffff813577f3>] __driver_attach+0x93/0xa0
[ 6.223365] [<ffffffff81357760>] ? __device_attach+0x40/0x40
[ 6.223365] [<ffffffff81355403>] bus_for_each_dev+0x63/0xa0
[ 6.223365] [<ffffffff81356e8e>] driver_attach+0x1e/0x20
[ 6.223365] [<ffffffff81356a28>] bus_add_driver+0x1f8/0x2b0
[ 6.223365] [<ffffffff81357e81>] driver_register+0x71/0x150
[ 6.223365] [<ffffffff813594e6>] platform_driver_register+0x46/0x50
[ 6.223365] [<ffffffff813595ab>] platform_driver_probe+0x1b/0xa0
[ 6.223365] [<ffffffffa071a55e>] hp_wmi_init+0x1be/0x1fb [hp_wmi]
[ 6.223365] [<ffffffffa071a3a0>] ? hp_wmi_bios_setup+0x3a0/0x3a0 [hp_wmi]
[ 6.223365] [<ffffffff8100210a>] do_one_initcall+0x10a/0x160
[ 6.223365] [<ffffffff810bdac6>] load_module+0x1b46/0x2640
[ 6.223365] [<ffffffff8128da20>] ? ddebug_proc_write+0xf0/0xf0
[ 6.223365] [<ffffffff810be662>] sys_init_module+0xa2/0xf0
[ 6.223365] [<ffffffff814d975d>] system_call_fastpath+0x1a/0x1f
[ 6.223365] Code: 48 ff ff ff 80 7b 24 00 74 d2 41 83 e5 01 45 38 ec 74 c9 48 8d bb a0 03 00 00 e8 ed bb ae e0 5b 41 5c 41 5d 44 89 f0 41 5e 5d c3 <0f> 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66
[ 6.223365] RIP [<ffffffffa05897af>] rfkill_set_hw_state+0x9f/0xb0 [rfkill]
[ 6.223365] RSP <ffff88007af6fb60>
[ 6.269418] ---[ end trace d433dd1cfe38fec2 ]---
This is the pstree upon boot and login, the tee process is suspicious:
systemd
|-dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation
|-login
| `-bash
| `-startx /usr/bin/startx
| `-xinit /home/max/.xinitrc -- /etc/X11/xinit/xserverrc :0 -auth /tmp/serverauth.DAEGu5rgzr
| |-X -nolisten tcp :0 -auth /tmp/serverauth.DAEGu5rgzr vt1
| | `-{X}
| `-openbox
| |-lxterminal
| | |-bash
| | | `-pstree -a
| | |-gnome-pty-helper
| | `-{lxterminal}
| `-tint2
|-systemd-journal
|-systemd-logind
|-systemd-udevd
`-tee /sys/bus/platform/devices/hp-wmi/power/control
And this is my boot parameters from Syslinux:
LABEL arch
MENU LABEL Arch Linux
LINUX ../vmlinuz-linux
APPEND root=/dev/sda1 ro init=/usr/lib/systemd/systemd consoleblank=0 quiet
INITRD ../initramfs-linux.img
I removed the powerdown package thinking it was the culprit, but it isn't.
Currently, I solved this problem by downgrading to an older kernel.
What could possibly be the cause?
Last edited by bjornoslav (2013-06-01 15:10:29)

Also reproduced with a vanilla kernel:
[ 11.793548] Kernel BUG at f82f054a [verbose debug info unavailable]
[ 11.793630] invalid opcode: 0000 [#1] PREEMPT SMP
[ 11.793694] Modules linked in: kvm_intel hp_wmi(+) sparse_keymap kvm e100 psmouse arc4 snd_hda_codec_conexant snd_hda_intel mii fan snd_hda_codec yenta_socket lpc_ich iwl3945 evdev snd_hwdep snd_pcm snd_page_alloc snd_timer snd iwlegacy thermal mfd_core mac80211 wmi soundcore battery ac rtc_cmos cfg80211 rfkill pcmcia_rsrc pcmcia_core rng_core cuse fuse nfs lockd sunrpc fscache autofs4 sr_mod cdrom dm_mod ehci_pci uhci_hcd ehci_hcd usbcore ata_piix usb_common ipv6 ext4 sd_mod crc16 mbcache crc_t10dif jbd2 ahci libahci libata cpufreq_ondemand acpi_cpufreq mperf processor freq_table coretemp hwmon
[ 11.794367] Pid: 1577, comm: systemd-udevd Not tainted 3.9.4-AP+ #29 Hewlett-Packard HP 530 Notebook PC(KP477AA#AKB)/30D5
[ 11.794439] EIP: 0060:[<f82f054a>] EFLAGS: 00010246 CPU: 1
[ 11.794476] EIP is at rfkill_set_hw_state+0x7a/0x80 [rfkill]
[ 11.794510] EAX: 00000000 EBX: 00000000 ECX: 00000018 EDX: 00000001
[ 11.794548] ESI: f501940c EDI: f5019400 EBP: c1261a20 ESP: f5353d74
[ 11.794587] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[ 11.794619] CR0: 8005003b CR2: 094768e8 CR3: 35216000 CR4: 000007d0
[ 11.794658] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 11.794696] DR6: ffff0ff0 DR7: 00000400
[ 11.794718] Process systemd-udevd (pid: 1577, ti=f5352000 task=f5952800 task.ti=f5352000)
[ 11.794770] Stack:
[ 11.794778] 00000000 f501940c f5019400 c1261a20 f812e232 f88263c8 00000003 00000f29
[ 11.794863] f501940c f8827014 f5019400 c1263286 f501940c f8827014 f8827014 c1261854
[ 11.794946] f5807fc0 f501940c f8827014 c12632e1 f501940c f8827014 f5019440 c1261a91
[ 11.795030] Call Trace:
[ 11.795048] [<c1261a20>] ? __device_attach+0x30/0x30
[ 11.795081] [<f812e232>] ? hp_wmi_bios_setup+0x232/0x34f [hp_wmi]
[ 11.795121] [<c1263286>] ? platform_drv_probe+0x26/0x50
[ 11.795154] [<c1261854>] ? driver_probe_device+0x54/0x1f0
[ 11.795188] [<c12632e1>] ? platform_match+0x31/0x70
[ 11.795218] [<c1261a91>] ? __driver_attach+0x71/0x80
[ 11.795249] [<c12600cf>] ? bus_for_each_dev+0x3f/0x70
[ 11.795281] [<c1261466>] ? driver_attach+0x16/0x20
[ 11.795311] [<c1261a20>] ? __device_attach+0x30/0x30
[ 11.795342] [<c126112f>] ? bus_add_driver+0x19f/0x250
[ 11.795374] [<c1261fb3>] ? driver_register+0x63/0x130
[ 11.795405] [<c126317f>] ? platform_driver_probe+0xf/0x80
[ 11.795440] [<f812e4e4>] ? hp_wmi_init+0x195/0xcb1 [hp_wmi]
[ 11.795476] [<f812e34f>] ? hp_wmi_bios_setup+0x34f/0x34f [hp_wmi]
[ 11.795515] [<c10011f2>] ? do_one_initcall+0x102/0x150
[ 11.795548] [<c1026ff1>] ? set_memory_ro+0x31/0x40
[ 11.795579] [<c10767bc>] ? set_section_ro_nx+0x5c/0x60
[ 11.795612] [<c1078a42>] ? load_module+0x17f2/0x1de0
[ 11.795645] [<c10790ff>] ? sys_finit_module+0x4f/0x60
[ 11.796769] [<c133c1be>] ? sysenter_do_call+0x12/0x26
[ 11.796769] Code: 00 89 d8 e8 89 ff ff ff 80 7b 14 00 74 dc 89 f8 89 f2 83 e0 01 38 c2 74 d1 8d 83 cc 01 00 00 e8 ad 06 d5 c8 89 e8 5b 5e 5f 5d c3 <0f> 0b 8d 74 26 00 8b 40 78 80 78 f4 00 75 07 f3 c3 90 8d 74 26
[ 11.796769] EIP: [<f82f054a>] rfkill_set_hw_state+0x7a/0x80 [rfkill] SS:ESP 0068:f5353d74
Quite obviously, this is related to HP laptops. Perhaps blacklisting the hp_wmi module could solve it. However, that module might be related to the extra buttons and/or to reporting the state of the hardware rfkill switch...
Last edited by andrej.podzimek (2013-05-31 15:52:03)

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processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Pentium(R) 4 CPU 3.00GHz
stepping : 1
cpu MHz : 2993.106
cache size : 1024 KB
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siblings : 2
core id : 0
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hlt_bug : no
f00f_bug : no
coma_bug : no
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fpu_exception : yes
cpuid level : 5
wp : yes
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processor : 1
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Pentium(R) 4 CPU 3.00GHz
stepping : 1
cpu MHz : 2993.106
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
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hlt_bug : no
f00f_bug : no
coma_bug : no
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fpu_exception : yes
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wp : yes
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stepping : 3
cpu MHz : 695.672
cache size : 256 KB
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hlt_bug : no
sep_bug : no
f00f_bug : no
coma_bug : no
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fpu_exception : yes
cpuid level : 2
wp : yes
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bogomips : 1389.36
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Recently, I purchased a laptop with an Intel i7-3920XM CPU, with the intention of utilizing it for scientific computing (I've become strongly interested in machine learning and artificial neural networks). Supposedly, the CPU has a variable clock speed of 2.90 -- 3.80 GHz, which would be great, but my kernel has throttled it to 1200MHz. I've tried both the cpufreq performance and userspace kernel modules (configured for performance), but the laptop stubbornly refuses to increase the clockspeed more than 1200MHz; I gave up on cpufreq and have uninstalled it. I've read some accounts that it is possible that the Linux kernel may not support my CPU yet --- does anybody know if that is the case? If it is not, can anybody point me to some literature describing how to un-throttle my CPU?
Last edited by deltaecho (2013-03-03 21:59:30)

runny6play wrote:
Meyithi wrote:
CPU frequency scaling is enabled by default, 1200MHz is fine for your processor as it's lowest frequency I have the 3960x and it's lowest frequency is 1200MHz as well.
You should just leave things as they are, if you can actually feel sluggish performance ( I don't with 6 cores @ 1200MHz) you can try this:- https://wiki.archlinux.org/index.php/Cp … erformance
Which will liven things up a bit at the cost of more battery juice.
EDIT/ compile something and whilst compiling
cat /proc/cpuinfo | grep MHz
to see what's reported at full load, but be aware it still may not report correctly due to turbo.
deltaecho wrote:Recently, I purchased a laptop with an Intel i7-3920XM CPU, with the intention of utilizing it for scientific computing (I've become strongly interested in machine learning and artificial neural networks). Supposedly, the CPU has a variable clock speed of 2.90 -- 3.80 GHz, which would be great, but my kernel has throttled it to 1200MHz. I've tried both the cpufreq performance and userspace kernel modules (configured for performance), but the laptop stubbornly refuses to increase the clockspeed more than 1200MHz; I gave up on cpufreq and have uninstalled it. I've read some accounts that it is possible that the Linux kernel may not support my CPU yet --- does anybody know if that is the case? If it is not, can anybody point me to some literature describing how to un-throttle my CPU?
I would agree with you if that was what the argument was about. I said the same thing about i7z as you just did, which is why i suggested it. as I understand it. your telling him 1.2 Ghz is an acceptable min and i would agree.How i am interperting his thread is 2.90 Ghz is his base. 3.80 Ghz is his max turbo. His CPU under 100 % load will not rise above 1.2 Ghz despite his stock clock is actually 2.90 Ghz. I can honestly say that this is the more likely story because my i7 did the same thing. on battery the max it would clock up to while runing /dev/urandom > /dev/null was 1.2 Ghz, while on Ac it would even turbo correctly. by unloading the module. my proccessor would clock as expected 800 mhz min 3.4 max turbo. and if you look he even used the performance governor to try to increase the clock
Ya, really the OP did not tell us 'how' he was reading his CPU speed....
deltaecho wrote:Recently, I purchased a laptop with an Intel i7-3920XM CPU, with the intention of utilizing it for scientific computing (I've become strongly interested in machine learning and artificial neural networks). Supposedly, the CPU has a variable clock speed of 2.90 -- 3.80 GHz, which would be great, but my kernel has throttled it to 1200MHz. I've tried both the cpufreq performance and userspace kernel modules (configured for performance), but the laptop stubbornly refuses to increase the clockspeed more than 1200MHz; I gave up on cpufreq and have uninstalled it. I've read some accounts that it is possible that the Linux kernel may not support my CPU yet --- does anybody know if that is the case? If it is not, can anybody point me to some literature describing how to un-throttle my CPU?
runny6play: If deltaecho is also seeing these same slow speeds in i7z then both you and he should look into your BIOS settings. For sure this would be a BIOS setting on a ThinkPad. "If on battery....slow... if on AC...fast".
Yes, it is the Linux Kernel that is no "Reporting" the correct speed. This is a known bug. However, there is nothing wrong with your CPU. It is running at High Speed.. Like this is the read out from my Kernel at idle...
[user@archtop:~]% sudo cat /proc/cpuinfo | grep MHz
[sudo] password for user:
cpu MHz : 1200.000
cpu MHz : 1200.000
cpu MHz : 2901.000
cpu MHz : 1200.000
The BEST way to test your CPU is, again i7z then compile some code... Like change the MAKEFLAGS="-j4" to -j1 for 1 thread, -j2 for 2 threads.... and so on. Compiling software will push your CPU all the way up.
When testing like this, i7z will show on 1 thread my CPU runs at 3.6GHz, on all 4 threads it runs at 3.4GHz, as it should. However, /proc/cpuinfo will only say wacky stuff like cpu MHz: 1200.000 cpu MHz: 2901.000
Last edited by hunterthomson (2012-11-26 09:28:13)

OEM12c agents high CPU usage alerts fix (leap second Linux kernel bug)

Just throwing this out here in case anyone else spent the weekend pulling their hair out and hasn't resolved this yet.
Due to the leap second that occurred at midnight UTC going into July 1st, most of my OEM 12c BP1 agents on Linux servers went haywire, taking up 100%+ CPU on monitored servers. This appears to be due to a bug triggered by the leap second.
The following seems to fix the issue without requiring a server reboot.
as root:
/etc/init.d/ntp stop
date `date +"%m%d%H%M%C%y.%S"`
/etc/init.d/ntp start
as OEM agent user:
$AGENT_HOME/bin/emctl stop agent ; $AGENT_HOME/bin/emctl start agent
I didn't discover the fix, but I've confirmed it works.
Edited by: BrianP on Jul 2, 2012 11:53 AM -- subject changed to note this is a Linux kernel bug, not a Java bug... kernel bug causes software using futexes (like Java) to spin and timeout repeatedly

See MOS note "Enterprise Manager Management Agent or OMS CPU Use Is Excessive on or around July 1, 2012 [ID 1472651.1]" for more information on this issue. Oracle notes it may occur from versions 10.2.0.5 through 12.1.0.1.0.
See also "Leap Second Hang - CPU Can Be Seen at 100% [ID 1472421.1]" and bug 14264454.
Thanks abulloch for getting the note out there!

[SOLVED] Linux 3.10.6 and brcmsmac: kernel panic

Hi!
I'm using latest linux kernel 3.10.6, on my laptop. I have a broadcom wifi card.
Cutting long story short, as soon as I start *anything* that uses my connection (opening chromium or issuing a "pacman -Syu"), i have a kernel panic.
The camera shot is not very good, but here it is: http://postimg.org/image/633skv3jx/full/ . As you can read last lines talk about brcmsmac.
Never had this kind of problem before upgrading to 3.10.6.
Any hint?
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Last edited by nierro (2013-09-04 07:35:32)

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ff:02.3 Host bridge: Intel Corporation Core Processor Reserved (rev 02)

[Solved]The linux kernel with build in bootloader?

First of let me apologize if I'm making no sense at all. This isn't really my area of expertise.
I just recently stumbled upon some rather interesting "news" about the linux kernel developers working to implement a an EFI/GTP (I think) bootloader in the kernel it self. I would very much like to know if this is actually true, I'd like to learn more and follow the development, but I haven't been able to find any relevant information, appart from the incomplete mailing list I stumbled upon.
I suspect that I'm simply using the wrong search parameters. Again, it's not like I know too much about what I'm doing.
In any case, if you have even the slightest idea what I'm talking about, please do guide me in the right direction.
Best regards.
Last edited by zacariaz (2012-03-01 20:02:04)

Gusar wrote:
litemotiv wrote:I was mainly thinking about a way to boot straight into Arch from rEFIt without chainloading grub/syslinux first.
Thanks to the info and links the.ridikulus.rat provided, I've now learned a bit more about this stuff (I'm probably still missing a lot ). Basically, rEFIt is a manager that launches bootloaders. With EFI_STUB, the kernel is it's own bootloader, so what you say is indeed possible - start linux from rEFIt without going through grub/syslinux. Well, it would be possible if there wasn't for one huge problem - rEFIt doesn't allow passing options, which is needed in this case. But that's where rEFIt's fork (rEFInd) comes into play.
Further, there are patches on the kernel mailing list that will make it possible for an EFI_STUB kernel to read options from a file. Then not even rEFInd will be needed. Strictly speaking it isn't needed even now, but you need to type the options manually on the efi shell, which isn't very convenient. Fun stuff all this, innit? . It's a whole new crazy world.
Cool, thanks for the pro-active research!

[Solved] Worth buying the book? Linux Kernel Internals

Dear Arch Community,
Yesterday I succesfully installed arch on my old laptop for testing purposes, and it's been great.
But I find that I simply lack a tad of knowledge about the internals (seeing I want to work towards LFS, and I'm comming from xubuntu with i3wm) so I installed Arch.
To go deeper into linux, I figured a book would be another resource, together with the arch wiki.
However, the only book (yes, i'd like a physical book for this one) I'm able to find only handles linux kernel version 2.6. We're at about 3.2/3.3 now.
source: http://www.amazon.com/Understanding-Lin … 0596005652
My question to you is; how much changes are there? Is it worth buying the book, or should I wait a little for the next Linux Kernel Internals book to come out (if there is any planned)
Thanks for any information,
Kind regards,
MatRoo
:wq
Last edited by MatRoo (2013-03-23 12:59:37)

weirddan455 wrote:
You don't really need to know the internals of the kernel for any of that stuff. LFS is just following a really long guide consisting mostly of compiling packages. I did it once a few years back on a virtual machine. The most you'll need to know about the kernel is how to configure and compile it. LAMP doesn't really touch the kernel at all. In fact you can run Apache, MySQL, and PHP on a Windows box and the configuration doesn't change all that much.
For most things all you need to know is the kernel is a big blob of code that makes your hardware work. I'm not trying to dissuade you from learning however, that's always a positive thing so if kernel internals are what you're interested in then read up but unless you're doing something really low level or help contribute to the kernel I'm not seeing much practical use. If you do webdev, it may be a better use of your time to learn some more PHP or MySQL instead.
I know i dont have to, but I'd like to know what's happening under the hood when I'm doing my stuff.
The original questions stays :-) Is it worth buying the book if I want to know the internals, since the book only covers 2.6, and we're a tad past version 2.6.
Thanks for your reply in any case tough :-)

Linux: Kernel Preemption, To Enable Or Not To Enable

The default 2.6.4 Arch Linux kernel .config has 'CONFIG_PREEMPT=y'.
Not everyone has been happy with kernel preemption, however. There is an interesting discussion of this under the title "Linux: Kernel Preemption, To Enable Or Not To Enable at http://kerneltrap.org/node/view/2702
The text of the article is repeated here:
"A recent bug report on the lkml complained of significant performance degradation from enabling CONFIG_PREEMPT, kernel preemption. 2.6 kernel maintainer Andrew Morton [interview] pointed out that such degradation from enabling kernel preemption is not normal, instead likely from it triggering a bug. However, an interesting conversation on the merits of kernel preemption followed.
Andrea Arcangeli, author of the 2.4 virtual memory subsystem, bluntly suggested, "keep preempt turned off always, it's useless. Preempt just wastes cpu with tons of branches in fast paths that should take one cycle instead." Andrew Morton noted, "preempt is overrated." However, he went on to point out that kernel preemption has been very useful in detecting locking bugs. He added, "it has been demonstrated that preempt improves the average latency. But not worst-case, because those paths tend to be under spinlock."
Robert Love [interview] replied directly to Andrea's comments saying, "I think you are really blowing the overhead of kernel preemption out of proportion," going on to agree with Andrew's statements. He further explained:
"I also feel you underestimate the improvements kernel preemption gives. Yes, the absolute worst case latency probably remains because it tends to occur under lock (although, it is now easier to pinpoint that latency and work some magic on the locks). But the variance of the latency goes way down, too. We smooth out the curve. And these are differences that matter."
There is more discussion and feedback with the article (including the original bug report).

I like preemption. it the "democracy" heaven of processes and threads. This post was interesting, but the point is this bug..?
if the bug is found, who can say that preemption in the kernel is not a good idea?
thanks for posting though ;P

Unable to run PL/SQL Cartridge (OAS 4.0.8.1, Redhat Linux Kernel 2.2, Oracle 8.1.5)

PL/SQL Cartridge server refuses to come up.
Config:
=======
OAS 4.0.8.1 on Redhat Linux Kernel 2.2
Oracle 8.1.5 on Windows NT
Remote access to the database using connect string
The Linux m/c and NT m/c have recommended system requirements and domain registering. I could invoke the procedure from SQL plus and view the HTML contents using owa_util.showpage. Also, I could install PL/SQL Web Toolkit using the same DAD. But Cartridge server just refuses to come up. If anyone has a solution for this, it would be a great help!!
P.S: Attached below is wrb.log
Thanks,
Kiran
Wrb Log Contents
================
02-11-2000 17:27:49 746919 devlinux `Broker` 2231 1 0x10fff `OWS-04764: Unable to bring up cartridge server, type icsawebsite, at devlinux. `
02-11-2000 17:27:50 760451 devlinux `Dispatcher` 2361 1 0x2fff `OWS-04517: Error indicated by broker in getting cartridges of type icsawebsite/ckreddy. `
02-11-2000 17:27:50 860311 devlinux `Dispatcher` 2361 1 0x2fff `OWS-04512: Request 604CD69E9EBF-A5EC-E000-16FAA8C00954 has internal error due to Error 4511. `
02-11-2000 17:31:47 204347 devlinux `Broker` 2231 1 0x10fff `OWS-04764: Unable to bring up cartridge server, type icsawebsite, at devlinux. `

We had the same problem with the PL/SQL cartridge (OWS-04764 ...). We solved our problem with a new kernel. Its important that you have a kernel with symmetric multi-processing support (SMP) enabled, independent if you have a one or two processor machine.
I hope it will help you.
Best regards
Hans Hirter
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by icsanet:
PL/SQL Cartridge server refuses to come up.
Config:
=======
OAS 4.0.8.1 on Redhat Linux Kernel 2.2
Oracle 8.1.5 on Windows NT
Remote access to the database using connect string
The Linux m/c and NT m/c have recommended system requirements and domain registering. I could invoke the procedure from SQL plus and view the HTML contents using owa_util.showpage. Also, I could install PL/SQL Web Toolkit using the same DAD. But Cartridge server just refuses to come up. If anyone has a solution for this, it would be a great help!!
P.S: Attached below is wrb.log
Thanks,
Kiran
Wrb Log Contents
================
02-11-2000 17:27:49 746919 devlinux `Broker` 2231 1 0x10fff `OWS-04764: Unable to bring up cartridge server, type icsawebsite, at devlinux. `
02-11-2000 17:27:50 760451 devlinux `Dispatcher` 2361 1 0x2fff `OWS-04517: Error indicated by broker in getting cartridges of type icsawebsite/ckreddy. `
02-11-2000 17:27:50 860311 devlinux `Dispatcher` 2361 1 0x2fff `OWS-04512: Request 604CD69E9EBF-A5EC-E000-16FAA8C00954 has internal error due to Error 4511. `
02-11-2000 17:31:47 204347 devlinux `Broker` 2231 1 0x10fff `OWS-04764: Unable to bring up cartridge server, type icsawebsite, at devlinux. `<HR></BLOCKQUOTE>
null

MHDDK broken on Linux kernel 4.0

One of the tools that ships with MHDDK is broken on new Linux kernels.
The problem is easy to reproduce:
cd nimhddk_linuxkernel/LinuxKernel/nirlpk
make
sudo make install
gives the following error:
nirlp: 4.0.0-040000-generic kernel not supported
Directly executing nirlp gives the same error. Older kernels (e.g. 3.13) don't have this issue.
Without this tool, none of the examples can even access the board.
This issue will presumably affect all new kernels. Since this tool is binary-only, a fix will have to come from NI.
NI, please provide a fix or workaround for this issue.
Solved!
Go to Solution.

drobson wrote:
Since this tool is binary-only, a fix will have to come from NI.
The MHDDK is 100% source code, scripts, and Makefiles -- all editable text files.
The nirlp file is a bash script, and it includes a check for kernel versions that were tested with the DDK examples. The last time the kernel module was updated was during the Linux 3.6 window. You can change the script to allow for newer kernels, and since you were able to compile the module, it looks hopeful that the module will load and support your devices.
Joe Friedchicken
NI VirtualBench Application Software
Get with your fellow hardware users :: [ NI's VirtualBench User Group ]
Get with your fellow OS users :: [ NI's Linux User Group ] [ NI's OS X User Group ]
Get with your fellow developers :: [ NI's DAQmx Base User Group ] [ NI's DDK User Group ]
Senior Software Engineer :: Multifunction Instruments Applications Group
Software Engineer :: Measurements RLP Group (until Mar 2014)
Applications Engineer :: High Speed Product Group (until Sep 2008)

[solved] stock kernel boot on xen fail

Hi all,
I install the archlinux on xen (http://prgmr.com/xen/) with the formal kernel
when boot the system, I get this error
xc_dom_probe_bzimage_kernel: unknown compression format
Anyone know how to solve it?
Last edited by hongy19 (2011-05-08 13:15:15)

Thanks for your reply. I have changed to use kernel26-xen from aur and it works.
It seems that the stock kernel uses xz to compress bzImage. And pygrub should only support gzip bzImage (https://bugzilla.redhat.com/show_bug.cgi?id=515831) for xen3.x. For xen4.0, lzma and bzip2 are supported
(http://wiki.xensource.com/xenwiki/Xen4.0)
[hongy19@Archlinux linux-2.6.38-ARCH]$ cat .config |grep -i config_kernel
# CONFIG_KERNEL_GZIP is not set
# CONFIG_KERNEL_BZIP2 is not set
# CONFIG_KERNEL_LZMA is not set
CONFIG_KERNEL_XZ=y
# CONFIG_KERNEL_LZO is not set
So I guess the stock kernel could not used with xen right now.
fukawi2 wrote:I'm not sure how prgmr do their Xen, but I'll take a stab that maybe you're using an xz compressed initrd? Try switching to gz
Last edited by hongy19 (2011-05-08 14:04:53)

Glibc question - 'RT using linux kernel aio'

Hello all,
Can anyone give some info about one of the glibc add-ons called 'RT using linux kernel aio'
I've googled alot without success.
Here is libc output in default ArchLinux install
GNU C Library stable release version 2.16, by Roland McGrath et al.
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 4.7.1 20120721 (prerelease).
Compiled on a Linux 3.4.6 system on 2012-07-24.
Available extensions:
crypt add-on version 2.1 by Michael Glad and others
GNU Libidn by Simon Josefsson
Native POSIX Threads Library by Ulrich Drepper et al
BIND-8.2.3-T5B
libc ABIs: UNIQUE IFUNC
For bug reporting instructions, please see:
<http://www.gnu.org/software/libc/bugs.html>.
In Fedora (and others) there is one additional glibc add-on listed:
GNU C Library stable release version 2.15, by Roland McGrath et al.
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 4.7.0 20120507 (Red Hat 4.7.0-5).
Compiled on a Linux 3.4.4 system on 2012-07-03.
Available extensions:
Support for some architectures added on, not maintained in glibc core.
The C stubs add-on version 2.1.2.
crypt add-on version 2.1 by Michael Glad and others
GNU Libidn by Simon Josefsson
Native POSIX Threads Library by Ulrich Drepper et al
BIND-8.2.3-T5B
>> RT using linux kernel aio <<
libc ABIs: UNIQUE IFUNC
For bug reporting instructions, please see:
<http://www.gnu.org/software/libc/bugs.html>.
Any chances we can have this add-on installed ? Or in other words is there any good reasons not to have this add-on ?
Regards,

ZENworks Linux Management is what used to be called Red Carpet - it
does not provide access for other client operating systems. Please
could you repost this in the community chat forum, since it will not
reference any Novell products.
Shaun Pond
Novell Support Connection SysOp

[SOLVED] Custom kernel 2.6.17 + ATI drivers

Hi,
I'm trying to get DRI, but can't load fglrx. I've read
http://wiki.archlinux.org/index.php/ATI … om_Kernels and
http://gentoo-wiki.com/HOWTO_ATI_Drivers
and done everything like in those howtos. If I set Driver "fglrx" X won't work. So I've made new kernel with some additional modules:
Device Drivers -->
Graphics support -->
<M> Support for frame buffer devices
<*> Enable firmware EDID
<M> ATI Radeon display support
[*] ODC/I2C for ATI Radeon support
[*] Blacklight & LCD device support --> ...
but the problem is still the same.
Here's some of my configs.
xorg_error.log:
hostname: Unknown host
xauth: creating new authority file /home/piotrek/.serverauth.10922
_XSERVTransSocketOpenCOTSServer: Unable to open socket for inet6
_XSERVTransOpen: transport open failed for inet6/arch:0
_XSERVTransMakeAllCOTSServerListeners: failed to open listener for inet6
X Window System Version 7.1.1
Release Date: 12 May 2006
X Protocol Version 11, Revision 0, Release 7.1.1
Build Operating System: UNKNOWN
Current Operating System: Linux arch 2.6.17 #4 Tue Sep 19 19:12:05 PDT 2006 i686
Build Date: 19 September 2006
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Module Loader present
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Tue Sep 19 23:22:42 2006
(==) Using config file: "/etc/X11/xorg.conf"
(EE) module ABI major version (0) doesn't match the server's version (1)
(EE) Failed to load module "fglrx" (module requirement mismatch, 0)
(EE) No drivers available.
Fatal server error:
no screens found
XIO: fatal IO error 104 (Connection reset by peer) on X server ":0.0"
after 0 requests (0 known processed) with 0 events remaining.
PKGBUILD from abs :
pkgname=ati-fglrx
pkgver=8.28.8
pkgrel=1
pkgdesc="ATI precompiled drivers for r350, r300, r250 and r200 chipsets. Drivers for the Linux kernel."
arch=(i686 x86_64)
url="http://www.ati.com"
license=""
depends=('ati-fglrx-utils')
makedepends=()
conflicts=('ati-drivers-module' 'ati-drivers-arch' 'nvidia')
install=ati-fglrx.install
_kernver=2.6.17
my xorg.conf:
Section "ServerLayout"
Identifier "Default Layout"
Screen 0 "aticonfig Screen 0" 0 0
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
EndSection
Section "Files"
FontPath "/usr/share/X11/fonts/misc"
FontPath "/usr/share/X11/fonts/cyrillic"
FontPath "/usr/share/X11/fonts/100dpi/:unscaled"
FontPath "/usr/share/X11/fonts/75dpi/:unscaled"
FontPath "/usr/share/X11/fonts/Type1"
FontPath "/usr/share/X11/fonts/CID"
FontPath "/usr/share/X11/fonts/100dpi"
FontPath "/usr/share/X11/fonts/75dpi"
FontPath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
FontPath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/CID"
EndSection
Section "Module"
Load "bitmap"
Load "ddc"
Load "dri"
Load "extmod"
Load "freetype"
Load "glx"
Load "int10"
Load "type1"
Load "vbe"
EndSection
Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option    "CoreKeyboard"
Option    "XkbRules" "xorg"
Option    "XkbModel" "pc105"
Option    "XkbLayout" "pl"
Option    "XkbOptions" "ctrl:nocaps"
EndSection
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option    "CorePointer"
Option    "Device" "/dev/input/mice"
Option    "Protocol" "ImPS/2"
Option    "ZAxisMapping" "4 5"
EndSection
Section "Monitor"
Identifier "S/T 77/76BDF"
HorizSync 30.0 - 90.0
VertRefresh 50.0 - 80.0
Option    "DPMS"
EndSection
Section "Monitor"
Identifier "aticonfig Monitor 0"
EndSection
Section "Device"
Identifier "ATI Technologies, Inc. Radeon 9100 (R200 QM)"
Driver "ati"
BusID "PCI:1:0:0"
EndSection
Section "Device"
Identifier "ATI Graphics Adapter 0"
Driver "fglrx"
Option    "(null)"
Option    "VideoOverlay" "on"
Option    "OpenGLOverlay" "off"
BusID "PCI:1:0:0"
EndSection
Section "Screen"
Identifier "Default Screen"
Device "ATI Technologies, Inc. Radeon 9100 (R200 QM)"
Monitor "S/T 77/76BDF"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1280x1024" "1024x768" "800x600" "640x480"
EndSubSection
EndSection
Section "Screen"
Identifier "aticonfig Screen 0"
Device "ATI Graphics Adapter 0"
Monitor "aticonfig Monitor 0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
Section "DRI"
Mode 0666
EndSection
I'm using xorg 11R7.0-1, ati-fglrx-utils 8.27.10-3, and my own package ati-fglrx-kickass 8.28.8-1

As mouse may have noticed, from the log:
# (EE) fglrx(0): [agp] unable to acquire AGP, error "xf86_ENODEV"
# (EE) fglrx(0): cannot init AGP
# (II) fglrx(0): [drm] removed 1 reserved context for kernel
# (II) fglrx(0): [drm] unmapping 8192 bytes of SAREA 0x2000 at 0xb7710000
# (WW) fglrx(0): ***********************************************
# (WW) fglrx(0): * DRI initialization failed! *
# (WW) fglrx(0): * (maybe driver kernel module missing or bad) *
# (WW) fglrx(0): * 2D acceleraton available (MMIO) *
# (WW) fglrx(0): * no 3D acceleration available *
# (WW) fglrx(0): ********************************************* *
That's your problem. Ensure you have both agp drivers loaded - there's agpgart and your board-specific drivers too. They both need to be loaded _before_ the fglrx kernel module.
To figure out which modules they are, run lsmod | grep agp and put both of them into the /etc/rc.conf MODULES array, before fglrx. If fglrx isn't in that array, put it there too, after the agp modules.
-=edit=- as for the aiglx thing, don't worry about it. It's harmless - I get the same message in my logs and everything works fine. -=/edit=-

Nikal linux kernel 2.6.11.8 build fails

I am trying to install nidaqmxbase-1.5.0-f2, but the install keeps failing. I tried installing with a stock FC3 kernel, but the build has failed. I have since tried again after building a stock linux 2.6.11.8 kernel, but I get the same error message. The "warning: `packed' attribute ignored" in particular is one I haven't seen before.
Attachments:
nikal.log.txt ‏5 KB

myric wrote:
I am trying to install nidaqmxbase-1.5.0-f2, but the install keeps failing. I tried installing with a stock FC3 kernel, but the build has failed. I have since tried again after building a stock linux 2.6.11.8 kernel, but I get the same error message. The "warning: `packed' attribute ignored" in particular is one I haven't seen before.
I found the answer to my question in another thread:
http://forums.ni.com/ni/board/message?board.id=250&message.id=11286&requireLogin=False
It appears that NI-KAL doesn't like the 2.6.10+ linux kernel due to a change in the API. Both the kernels I tried were 2.6.10 plus.
Perhaps in the next release if nidaqmxbase the latest kernel will be supported? Hint, hint, pretty-please from a paying customer. ;-)

[SOLVED] Linux kernel 3.9.2-1 bug - hp_wmi dmesg errors (hp nx9420)

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