RE: [Xen-devel] netfont bug

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> I've been doing a lot of dm-userspace smash testing, and appear to
have
> uncovered an unrelated netfront bug.  The following just showed up 3
guests
> during initial boot (xendomains called on boot).

Just to confirm, this was definitely during domain creation rather than
restoring from a saved image? (which I think xendomains has an option to
do)

It might be interesting to print out requeue_idx in netfront.c just to
check that it's not thinking it needs to do ring recovery.

Thanks,
Ian
 
> ----------- [cut here ] --------- [please bite here ] ---------
> Kernel BUG at drivers/xen/netfront/netfront.c:709
> invalid opcode: 0000 [1] SMP
> CPU 0
> Modules linked in:
> Pid: 8, comm: xenwatch Not tainted 2.6.16.13-xen #1
> RIP: e030:[<ffffffff8024c3a6>]
> <ffffffff8024c3a6>{network_alloc_rx_buffers+495}
> RSP: e02b:ffff8800004e1df8  EFLAGS: 00010082
> RAX: 0000000000000000 RBX: ffff88002f39dd80 RCX: 000000000002f29c
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000001040
> RBP: ffff880000618500 R08: 0000000000000000 R09: 000000000002d352
> R10: 0000000000000000 R11: 0000000000000000 R12: ffff880031e0d838
> R13: ffff880000618628 R14: 0000000000000208 R15: ffff88000061dda0
> FS:  00002acc8a46e720(0000) GS:ffffffff8046d000(0000)
> knlGS:0000000000000000
> CS:  e033 DS: 0000 ES: 0000
> Process xenwatch (pid: 8, threadinfo ffff8800004e0000, task
> ffff880000636100)
> Stack: ffff880000618000 00008800004e1ed8 000000dc00000100
ffff8800007f1f68
>        00000000000000dc 0000002400636318 ffff880000636100
ffff8800006457e0
>        0000000000000001 ffff880000618000
> Call Trace: <ffffffff8024c909>{backend_changed+456}
>        <ffffffff802407be>{xenwatch_thread+0}
> <ffffffff8014095e>{keventd_create_kthread+0}
>        <ffffffff8023fdd9>{xenwatch_handle_callback+21}
> <ffffffff802408eb>{xenwatch_thread+301}
>        <ffffffff80140d39>{autoremove_wake_function+0}
> <ffffffff8014095e>{keventd_create_kthread+0}
>        <ffffffff802407be>{xenwatch_thread+0}
> <ffffffff80140c02>{kthread+212}
>        <ffffffff8010b8ce>{child_rip+8}
> <ffffffff8014095e>{keventd_create_kthread+0}
>        <ffffffff80140b2e>{kthread+0} <ffffffff8010b8c6>{child_rip+0}
> 
> Code: 0f 0b 68 13 94 30 80 c2 c5 02 4c 63 e2 48 8d bd 80 15 00 00
> RIP <ffffffff8024c3a6>{network_alloc_rx_buffers+495} RSP
<ffff8800004e1df8>
> 
> Dom0 == Fedora Core 5
> 
> 
> root@nibbler:~> xm info
> host                   : nibbler.ltc.ibm.com
> release                : 2.6.16.13-xen
> version                : #1 SMP Thu Aug 24 16:19:01 EDT 2006
> machine                : x86_64
> nr_cpus                : 4
> nr_nodes               : 1
> sockets_per_node       : 2
> cores_per_socket       : 1
> threads_per_core       : 2
> cpu_mhz                : 3600
> hw_caps                : bfebfbff:20000800:00000000:00000180:0000659d
> total_memory           : 8190
> free_memory            : 4671
> xen_major              : 3
> xen_minor              : 0
> xen_extra              : -unstable
> xen_caps               : xen-3.0-x86_64
> xen_pagesize           : 4096
> platform_params        : virt_start=0xffff800000000000
> xen_changeset          : Thu Aug 24 14:16:22 2006 -0500
11223:e94865fc87a5
> cc_compiler            : gcc version 4.1.1 20060525 (Red Hat 4.1.1-1)
> cc_compile_by          : root
> cc_compile_domain      : (none)
> cc_compile_date        : Thu Aug 24 16:19:05 EDT 2006
> xend_config_format     : 2
> 
>       -Sean
> 
> --
> Sean Dague
> IBM Linux Technology Center                     email: japh@xxxxxxxxxx
> Open Hypervisor Team                           alt: sldague@xxxxxxxxxx

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