[Xen-users] Remus: Xen 4.2.1 with Debian 6.0 does not work

["D K" <daniel-knobe@xxxxxx>]

First of all I describe the system I used, where the error occures:

Network:

PC1 IP: 129.217.43.54 --------- Router --------- PC2 IP: 129.217.43.51

Hardware:

PC1 and PC2 have a Intel Core2 Quad CPU Q9550

Software:

OS: Debian 6.0

Dom0 Kernel: Jeremys 2.6.32.57 with the following config: http://pgb.game-host.org/xen/config

Xen: Version 4.2.-testing from mercurial

Guest:

Config: http://pgb.game-host.org/xen/debian.cfg

Erroranalysis:

1. Getting the vm started on PC1 with the following command works fine:

   xl create debian.cfg

2. Remus does not:
   

   xl remus <domid> 129.217.43.51

Segmentation fault

xc: error: read_exact_timed failed (select returned 0): Internal error

xc: error: Error reading QEMU signature (110 = Connection timed out): Internal error

xc: error: error buffering image tail, finishing: Internal error

migration target: Remus Failover for domain 3

This message was send from PC2 and is shown on PC1.

3. The next step is to run xl in the GNU Debugger, which reports the error in more detail:

Program received signal SIGSEGV, Segmentation fault.

0xb7e4bf4e in ?? () from /lib/i686/nosegneg/libc.so.6

xc: error: read_exact_timed failed (select returned 0): Internal error

xc: error: Error reading QEMU signature (110 = Connection timed out): Internal error

xc: error: error buffering image tail, finishing: Internal error

migration target: Remus Failover for domain 3

4. libc debugsymbols are missing. I installed them and run gdb again:

Program received signal SIGSEGV, Segmentation fault.

malloc_consolidate (av=<value optimized out>) at malloc.c:5139

5139 malloc.c: Datei oder Verzeichnis nicht gefunden.

in malloc.c

xc: error: read_exact_timed failed (select returned 0): Internal error

xc: error: Error reading QEMU signature (110 = Connection timed out): Internal error

xc: error: error buffering image tail, finishing: Internal error

migration target: Remus Failover for domain 3

5. Getting backtrace:

#0 0xb7e4bfea in malloc_consolidate (av=<value optimized out>)

at malloc.c:5145

#1 0xb7e4e21d in _int_malloc (av=<value optimized out>,

bytes=<value optimized out>) at malloc.c:4373

#2 0xb7e506f3 in *__GI___libc_malloc (bytes=1012) at malloc.c:3661

#3 0xb7f9e011 in datacopier_readable (egc=0xbffff2bc, ev=0x806a92c, fd=21,

events=1, revents=1) at libxl_aoutils.c:144

#4 0xb7fa3072 in afterpoll_internal (egc=0xbffff2bc,

poller=<value optimized out>, nfds=6, fds=0x806bb10, now=...)

at libxl_event.c:948

#5 0xb7fa3e1b in eventloop_iteration (egc=<value optimized out>,

poller=0x806a688) at libxl_event.c:1368

#6 0xb7fa448f in libxl__ao_inprogress (ao=0x806a768,

file=0xb7fb09cc "libxl.c", line=728,

func=0xb7fb2c4f "libxl_domain_remus_start") at libxl_event.c:1614

#7 0xb7f842bf in libxl_domain_remus_start (ctx=0x806a030, info=0xbffff3c4,

domid=2, send_fd=10, recv_fd=11, ao_how=0x0) at libxl.c:728

#8 0x0805045e in main_remus (argc=3, argv=0xbffff4f8) at xl_cmdimpl.c:6776

#9 0x0804d2be in main (argc=4, argv=0xbffff4f4) at xl.c:267

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