[pve-devel] Blacklisting HP hardware watchdog timer module ?

[Alexandre DERUMIER]

So,

I think that we blacklist all hardware watchdog module, we can keep nmi watchdog enabled.

but in the wiki,

we need to add a note:

if you want to use hardware watchdog, you need to disable nmi_watchdog=0
and load hardware watchdog in /etc/modules.


common hardware watchdog are :

intel itco (ich chipset motherboard, almost any intel motherboard since 15years):

/etc/modules
------------
iTCO_wdt
iTCO_vendor_support


dell idrac or generic ipmi:

/etc/modules
------------
ipmi_watchdog


hp lio:

/etc/modules
------------
hpwdt





----- Mail original -----
De: "aderumier" <aderumier at odiso.com>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Jeudi 3 Décembre 2015 06:47:15
Objet: Re: [pve-devel] Blacklisting HP hardware watchdog timer module ?

They are also a "nowatchdog" grub option, to disable nmi watchdog (hard-lockup) & soft-lockup 


https://lkml.org/lkml/2015/3/2/651 

nmi_watchdog=	[KNL,BUGS=X86] Debugging features for SMP kernels 
Format: [panic,][nopanic,][num] 
-			Valid num: 0 
+			Valid num: 0 or 1 
0 - turn nmi_watchdog off 
+			1 - turn nmi_watchdog on 
When panic is specified, panic when an NMI watchdog 
timeout occurs (or 'nopanic' to override the opposite 
default). 
@@ -2460,7 +2461,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 

nousb		[USB] Disable the USB subsystem 

-	nowatchdog	[KNL] Disable the lockup detector (NMI watchdog). 
+	nowatchdog	[KNL] Disable both lockup detectors, i.e. 
+                        soft-lockup and NMI watchdog (hard-lockup). 

nowb		[ARM] 




	

Alexandre Derumier 
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De: "aderumier" <aderumier at odiso.com> 
À: "pve-devel" <pve-devel at pve.proxmox.com> 
Envoyé: Jeudi 3 Décembre 2015 06:24:01 
Objet: Re: [pve-devel] Blacklisting HP hardware watchdog timer module ? 

About nmi watchdog, 

I have it enabled, even if no watchdog module is loaded. 

The only way I have found to disable it is to pass "nmi_watchdog=0" 
to grub. 


cat /proc/sys/kernel/nmi_watchdog to see if it's enable or not. 

(I can't load idrac ipmi_watchdog until it's disable) 


----- Mail original ----- 
De: "lyt_yudi" <lyt_yudi at icloud.com> 
À: "pve-devel" <pve-devel at pve.proxmox.com> 
Envoyé: Mercredi 2 Décembre 2015 20:33:08 
Objet: Re: [pve-devel] Blacklisting HP hardware watchdog timer module ? 





在 2015年12月2日，下午7:08，Dietmar Maurer < dietmar at proxmox.com > 写道： 
I will ship a blacklist for all watchdog modules with newer kernels: 

https://git.proxmox.com/?p=pve-kernel.git;a=commitdiff;h=acea917faa9ef4974f984b9b2dc612e73d22d220 

With latest kernel you can show that blacklist with: 

# cat /lib/modprobe.d/blacklist_pve-kernel-4.2.6-1-pve.conf 




for me. maybe it's can working of the dell r710. 

had a few times, 
——————— 
NMI watchdog: BUG: soft lockup - CPU#5 stuck for 23s! [swapper/5:0] 
——————— 

http://mirrors.myccdn.info/images/dell-r710-bug.txt 

thanks. 


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