[Xen-devel] Re: blktap2 bug:Assertion 'list_empty(&vreq->next)' failed

[tsk <aixt2006@xxxxxxxxx>]

If a tapdisk2 process segfault, the Dom0 will crash. So the robustness of tapdisk2 process and blktap2 driver is very very important!

Is there any version to solve this problem?

2010/6/28 tsk <aixt2006@xxxxxxxxx>

Hi folks,

Yestoday, I run a testcase, 6 VMs restart every 10 minitues from 11:00 am to 16:30 pm until Dom0 crashed.

 

Assertion 'list_empty(&vreq->next)' failed will lead to tapdisk2 process segfault, then Dom0 crashed!

Jun 27 16:31:05 r02k05014 kernel: device tap775.0 entered promiscuous mode

Jun 27 16:31:05 r02k05014 kernel: eth0: port 13(tap775.0) entering forwarding state

Jun 27 16:31:15 r02k05014 tapdisk2[4341]: Assertion 'list_empty(&vreq->next)' failed, line 1822, file tapdisk-vbd.c

Jun 27 16:31:15 r02k05014 kernel: tapdisk2[4341]: segfault at 0 ip 000000000040a24f sp 00007fff0d8acb70 error 6 in tapdisk2[400000+39000]

Jun 28 18:58:09 r02k05014 syslogd 1.4.1: restart.

Any one who can give me some tips?  

What will lead to   Assertion 'list_empty(&vreq->next)' failed   ?

xm info:

release                : 2.6.31.13

version                : #3 SMP Fri Apr 30 15:10:24 CST 2010

machine                : x86_64

nr_cpus                : 16

nr_nodes               : 2

cores_per_socket       : 4

threads_per_core       : 2

cpu_mhz                : 2266

hw_caps                : bfebfbff:28100800:00000000:00001b40:009ce3bd:00000000:00000001:00000000

virt_caps              : hvm

total_memory           : 24544

free_memory            : 19693

node_to_cpu            : node0:0,2,4,6,8,10,12,14

                         node1:1,3,5,7,9,11,13,15

node_to_memory         : node0:7633

                         node1:12059

node_to_dma32_mem      : node0:2996

                         node1:0

max_node_id            : 1

xen_major              : 4

xen_minor              : 0

xen_extra              : .0

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          : unavailable

xen_commandline        : console=com1,vga com1=115200,8n1 msi=1 dom0_mem=6144M  dom0_max_vcpus=4  dom0_vcpus_pin iommu=off x2apic=off hap=0

cc_compiler            : gcc version 4.1.2 20080704 (Red Hat 4.1.2-46)

cc_compile_by          : root

cc_compile_date        : Wed May 12 19:09:47 CST 2010

xend_config_format     : 4

tsk

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