[Xen-devel] netfont bug

[Sean Dague <japh@xxxxxxxxxx>]

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).

----------- [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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