[Xen-users] Xen PV boot "hangs" on sysklogd + apache

[Niels Dettenbach <nd@xxxxxxxxxxxx>]

Hiho,


may be someone of you has some idea or experience with this "crazy" effect.

When starting a PV VM (Linux) it boots weel, as long as there is no Apache or 
sysklogd to start, which leads to hang then.

 If i boot into the PV (by going over that daemons) and start sysklogd, it 
seems to start correctly, but the init script could not exit.

The same PV VMs wboot and work well on the old system.

Same happens with different newer and older DomU kernels - so i assume this is 
related to anywhere in:

        - dom0 kernel config
        - XEN HV / dom0 setup

it seems, Debian had a similiar "Bug" within their Dom0 too in the past - no 
idea how far this may be related:
https://serverfault.com/questions/674543/kjournald-and-apache2-hang-on-xen-vps

Possibly someone has an idea about,  a same experience or know what is wrong 
(any kernel config option)?


tech specs:
=========
My new - self build - setup of XEN 4.7.2 (4.8.1-r1 seems not build) with Gentoo 
Linux dom0 should take over PV guests from an older machine with older XEN - 
anything compiled with GCC 5.4.0 (hardened) an AMD64 / core-avx-i.

system is a HP DL580 G8 with 2*6 Core Intel(R) Xeon(R) CPU E7-4809 v2 @ 1.90GHz.


Linux dom0 Kernel: 4.11.4


#xl info
host                   : xenlu1
release                : 4.11.4-syndicat-dom0
version                : #5 SMP Thu Jun 15 18:29:36 CEST 2017
machine                : x86_64
nr_cpus                : 24
max_cpu_id             : 143
nr_nodes               : 2
cores_per_socket       : 6
threads_per_core       : 2
cpu_mhz                : 1895
hw_caps                : 
b7ebfbff:77bee3ff:2c100800:00000001:00000001:00000281:00000000:00000100
virt_caps              : hvm hvm_directio
total_memory           : 65427
free_memory            : 63561
sharing_freed_memory   : 0
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 7
xen_extra              : .2
xen_version            : 4.7.2
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          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          :
xen_commandline        : placeholder com1=115200,8n1 console=com1,vga 
dom0_mem=1024M,max:1024M loglvl=all guest_loglvl=all dom0_max_vcpus=2 
dom0_vcpus_pin noreboot no-bootscrub
cc_compiler            : x86_64-pc-linux-gnu-gcc (Gentoo Hardened 5.4.0-r3 
p1.3, pie-0.6
cc_compile_by          :
cc_compile_domain      : syndicat.com
cc_compile_date        : Thu Jun 15 20:07:49 CEST 2017
build_id               : 3c397c1a85f8249e7da8c4ded0eb4be41a9c3d4e
xend_config_format     : 4


many thanks for any help / idea / hint,



best regards,


Niels.
-- 
 ---
 Niels Dettenbach
 Syndicat IT & Internet
 http://www.syndicat.com
 PGP: https://syndicat.com/pub_key.asc
 ---
 





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