Bug 10966

Summary:	[REGRESSION] kernel freezes reinitializing SMP CPU
Product:	Platform Specific/Hardware	Reporter:	Cijoml Cijomlovic Cijomlov (cijoml)
Component:	i386	Assignee:	platform_i386
Status:	CLOSED CODE_FIX
Severity:	blocking	CC:	greg
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.26	Subsystem:
Regression:	Yes	Bisected commit-id:
Attachments:	dmidecode_HP_Compaq_6910p_BIOS_F14 dmesg-HP_Compaq_6910p_2.6.26_BIOS_F14

Description Cijoml Cijomlovic Cijomlov 2008-06-23 09:10:47 UTC

Latest working kernel version: 2.6.22?
Earliest failing kernel version: unk
Distribution: Debian testing
Hardware Environment: HP Compaq 6910p, Core2Duo
Software Environment: Debian testing, vanilla 2.6.25.6, i386 kernel
Problem Description:

kernel freezes doing 

echo 0 > /sys/devices/system/cpu/cpu1/online
Everythink is ok, I see only 1 cpu in /proc/cpuinfo
echo 1 > /sys/devices/system/cpu/cpu1/online
Immeditial freeze!

Steps to reproduce:
Write commands

Comment 1 Cijoml Cijomlovic Cijomlov 2008-07-24 12:15:04 UTC

Same error with 2.6.26

Comment 2 Renato S. Yamane 2008-07-25 13:26:56 UTC

Hi Cijoml,
I tested here and can't reproduce freeze as commented by you.

Distribution: Debian Lenny

Hardware Environment: Lenovo 3000 V200

# uname -a
Linux mandachuva 2.6.24-1-686 #1 SMP Thu May 8 02:16:39 UTC 2008 i686 GNU/Linux

# cat /proc/cpuinfo | grep 'model name'
model name      : Intel(R) Core(TM)2 Duo CPU     T7100  @ 1.80GHz
model name      : Intel(R) Core(TM)2 Duo CPU     T7100  @ 1.80GHz

I turn-off and turn-on CPU1 as commented by you and my laptop don't freeze.

Best regards,
Renato S. Yamane
Brazil

Comment 3 Thomas Gleixner 2008-07-28 00:32:25 UTC

Cijoml,

can you please provide a full boot log (dmesg output) of your machine.

Also can you please switch to a text terminal (Alt+F1) and do the online/offline there so you can see whether there is some output from the kernel.

Comment 4 Cijoml Cijomlovic Cijomlov 2008-07-28 02:50:07 UTC

Hello,

I will provide it later, but what is strange I see there:

Misrouted IRQ fixup and polling support enabled
 This may significantly impact system performance

Michal

Comment 5 Cijoml Cijomlovic Cijomlov 2008-07-28 20:45:11 UTC

Created attachment 17019 [details]
dmidecode_HP_Compaq_6910p_BIOS_F14

dmidecode_HP_Compaq_6910p_BIOS_F14

Comment 6 Cijoml Cijomlovic Cijomlov 2008-07-28 20:45:26 UTC

Created attachment 17020 [details]
dmesg-HP_Compaq_6910p_2.6.26_BIOS_F14

dmesg-HP_Compaq_6910p_2.6.26_BIOS_F14

Comment 7 Thomas Gleixner 2008-09-10 13:31:09 UTC

> Misrouted IRQ fixup and polling support enabled
> This may significantly impact system performance

This due to:
Kernel command line: BOOT_IMAGE=Linux ro root=803 irqpoll

Can you please remove the irqpoll option from the kernel commandline ?

Comment 8 Cijoml Cijomlovic Cijomlov 2008-09-10 22:16:12 UTC

I could, but then I get OOSPs asking me to switch it on (MMC/SD card reader)

Comment 9 Cijoml Cijomlovic Cijomlov 2008-09-10 22:22:04 UTC

http://bugzilla.kernel.org/show_bug.cgi?id=10916

This one

Comment 10 Thomas Gleixner 2008-09-11 03:48:18 UTC

well, the question is whether _this_ problem goes away when you remove irqpoll
The nobody cared interrupt is a separate issue.

Comment 11 Cijoml Cijomlovic Cijomlov 2008-09-15 13:33:09 UTC

Well I tried without irqpoll, but I also hit the bug...

Comment 12 Cijoml Cijomlovic Cijomlov 2008-11-10 01:37:51 UTC

Seems fixed in 2.6.27.5