xl list command hangs

[Praveen Kumar <kpraveen.lkml@gmail.com>]

Hi All,

I am working with latest xen code base ( Unstable branch ). Tried with
no changes / commit from my end, and was facing the hang issue while
running xl list command. I tried doing make world and installing the
packages, but still the problem persists. There we not any specific
logs in xl dmesg when I ran the command.

Has anyone observed this issue ? Please provide pointer how I can
resolve this issue. Thanks in advance.

Below are the snapshot / machine details :


praveen@praveen-Aspire-E5-573G:~$ sudo xl list
Name                                        ID   Mem VCPUs	State
	Time(s)


praveen@praveen-Aspire-E5-573G:~$ ps -ef | grep xl
root      2316  2065  0 23:40 pts/8    00:00:00 sudo xl list
root      2317  2316  0 23:40 pts/8    00:00:00 xl list
praveen   2494  2379  0 23:42 pts/9    00:00:00 grep --color=auto xl

praveen@praveen-Aspire-E5-573G:~$ sudo cat /proc/2317/stack
[<ffffffff814dfa66>] xenbus_dev_request_and_reply+0x26/0x90
[<ffffffff814e1f3b>] xenbus_file_write+0x29b/0x590
[<ffffffff8120e638>] __vfs_write+0x18/0x40
[<ffffffff8120efc9>] vfs_write+0xa9/0x1a0
[<ffffffff8120fc85>] SyS_write+0x55/0xc0
[<ffffffff8183b972>] entry_SYSCALL_64_fastpath+0x16/0x71
[<ffffffffffffffff>] 0xffffffffffffffff

praveen@praveen-Aspire-E5-573G:~/xen$ sudo xl info
host                   : praveen-Aspire-E5-573G
release                : 4.4.0-75-generic
version                : #96-Ubuntu SMP Thu Apr 20 09:56:33 UTC 2017
machine                : x86_64
nr_cpus                : 4
max_cpu_id             : 7
nr_nodes               : 1
cores_per_socket       : 2
threads_per_core       : 2
cpu_mhz                : 2394
hw_caps                :
bfebfbff:77faf3bf:2c100800:00000121:00000001:001c27ab:00000000:00000100
virt_caps              : hvm hvm_directio
total_memory           : 8111
free_memory            : 128
sharing_freed_memory   : 0
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 9
xen_extra              : -rc
xen_version            : 4.9-rc
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64 
xen_scheduler          : credit2
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : Fri May 5 17:09:49 2017 +0200 git:8839be5
xen_commandline        : placeholder sched=credit2
credit2_runqueue=core
cc_compiler            : gcc (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0
20160609
cc_compile_by          : root
cc_compile_domain      : 
cc_compile_date        : Thu May 11 23:35:54 IST 2017
build_id               : 37f8c3a2577cc5321e907ff5be1c9066ecd615b2
xend_config_format     : 4

Regards,

~Praveen.

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