# NMI watchdog: BUG: soft lockup

**URL:** https://forums.suse.com/t/nmi-watchdog-bug-soft-lockup/35278
**Category:** SLES Virtualization
**Created:** [September 14, 2020, 3:19am UTC](https://forums.suse.com/t/nmi-watchdog-bug-soft-lockup/35278 "2020-09-14T03:19:25Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![yuhuihu](https://avatars.discourse-cdn.com/v4/letter/y/47e85d/32.png) [@yuhuihu](https://forums.suse.com/u/yuhuihu)
#### Post date: [September 14, 2020, 3:19am UTC](https://forums.suse.com/t/nmi-watchdog-bug-soft-lockup/35278/1 "2020-09-14T03:19:25Z")

</div>

I am facing an issue, which is NMI watchdog: BUG: soft lockup. The system hangs up and can not be reached via any terminal and ping command.  
The issue happens in a virtual machine.  
Host CPU information is below

> ```
> # lscpu
> Architecture: x86_64
> CPU op-mode(s): 32-bit, 64-bit
> Byte Order: Little Endian
> CPU(s): 160
> On-line CPU(s) list: 0-159
> Thread(s) per core: 2
> Core(s) per socket: 10
> Socket(s): 8
> NUMA node(s): 8
> Vendor ID: GenuineIntel
> CPU family: 6
> Model: 47
> Stepping: 2
> CPU MHz: 1064.000
> BogoMIPS: 4800.28
> Virtualization: VT-x
> L1d cache: 32K
> L1i cache: 32K
> L2 cache: 256K
> L3 cache: 30720K
> NUMA node0 CPU(s): 1-10,41-50
> NUMA node1 CPU(s): 11-20,51-60
> NUMA node2 CPU(s): 21-30,61-70
> NUMA node3 CPU(s): 31-40,71-80
> NUMA node4 CPU(s): 0,81-89,120-129
> NUMA node5 CPU(s): 90-99,130-139
> NUMA node6 CPU(s): 100-109,140-149
> NUMA node7 CPU(s): 110-119,150-159
> 
> ```

Host virtual machine information is below.

> ```
> # virt-manager --version
> 0.9.4
> 
> ```

Host OS information is below

> ```
> # uname -r
> 3.0.101-0.47.79-default
> # cat /etc/SuSE-release
> SUSE Linux Enterprise Server 11 (x86_64)
> VERSION = 11
> PATCHLEVEL = 3
> 
> ```

Guest CPU information is below. In virt-manager, I selected “Copy host CPU configuration”.  
\> # lscpu

> ```
> Architecture: x86_64
> CPU op-mode(s): 32-bit, 64-bit
> Byte Order: Little Endian
> Address sizes: 42 bits physical, 48 bits virtual
> CPU(s): 4
> On-line CPU(s) list: 0-3
> Thread(s) per core: 1
> Core(s) per socket: 1
> Socket(s): 4
> NUMA node(s): 1
> Vendor ID: GenuineIntel
> CPU family: 6
> Model: 2
> Model name: QEMU Virtual CPU version 1.4.2
> Stepping: 3
> CPU MHz: 2400.084
> BogoMIPS: 4800.16
> Hypervisor vendor: KVM
> Virtualization type: full
> L1d cache: 32K
> L1i cache: 32K
> L2 cache: 4096K
> NUMA node0 CPU(s): 0-3
> Flags: fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pse36 clflush mmx fxsr sse sse2 syscall nx lm rep_good nopl cpuid tsc_known_freq pni cx16 popcnt hypervisor lahf_lm pti
> 
> ```

Guest OS information

> ```
> # uname -r
> 4.12.14-197.37-default
> # lsb-release -a
> LSB Version: n/a
> Distributor ID: SUSE
> Description: SUSE Linux Enterprise Server 15 SP1
> Release: 15.1
> Codename: n/a
> 
> ```

I checked below informatin in guest system.

> ```
> # cat /proc/sys/kernel/tainted
> 0
> # cat /proc/sys/kernel/watchdog
> 1
> # cat /proc/sys/kernel/watchdog_thresh
> 10
> # cat /proc/sys/kernel/nmi_watchdog
> 0
> # cat /proc/sys/kernel/soft_watchdog
> 1
> # cat /proc/sys/kernel/softlockup_panic
> 0
> # cat /proc/sys/kernel/unknown_nmi_panic
> 0
> 
> ```

And I did below update in guest system.

> ```
> # echo 0 > /proc/sys/kernel/watchdog
> # echo 0 > /proc/sys/kernel/soft_watchdog
> # echo 20 > /proc/sys/kernel/watchdog_thresh
> 
> ```

The issue is still there and the challenge is that host OS can not be upgraded to higher SLES version. Could you please advise if any solutions.