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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

Adding xen-devel since this is an xl segfault.

Please can you not send html mail. Plain text is just fine.

On Fri, 2012-11-02 at 12:32 +0000, D K wrote:

> Xen: Version 4.2.-testing from mercurial

Which version exactly ? There was a batch of backports recently which
included some fixes to the ao infrastructure, including a fix for
aoinprogress (which appears in your stack trace).

So please can you try the most recent tip of 4.2-testing.

> 
> 
> 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

Does normal migration work?

>         
> 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 

It seems like there might be more than one issue here, the original
failure and then a failure in the error path too.

[...snip, I don't thin k w needed the whole story, just the resulting
stacktrace...]

Is this backtrace from the sending or the receiving xl?

> #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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