Re: [Xen-devel] help on debugging kernel module in Xen

["Lily Huang" <ushuanglily@xxxxxxxxx>]

Hi Brendan,

You are right. After I lift the breakpoint a little bit (to sys_open), the breakpoint works. 

But now the domU kept complaining after I did "target remote 127.0.0.1:9999
" and then "br sys_open":

/************************************************?
BUG: soft lockup detected on CPU#0!

Pid: 0, comm:              swapper
EIP: 0061:[<c01013a7>] CPU: 0
EIP is at 0xc01013a7
 EFLAGS: 00000346    Not tainted  (2.6.16.33-xenU #12)
EAX: 00000000 EBX: 00000001 ECX: 00000000 EDX: 00000000
ESI: 00000001 EDI: c0354000 EBP: c0355f84 DS: 007b ES: 007b
CR0: 8005003b CR2: b7f77000 CR3: 1d633000 CR4: 00000640
 [<c0105bb3>] show_trace+0x13/0x20
 [<c0103390>] show_regs+0x190/0x1e0
 [<c013cf48>] softlockup_tick+0x88/0xa0
 [<c0126d45>] do_timer+0x215/0x440
 [<c010858c>] timer_interrupt+0x1bc/0x6a0
 [<c013d09f>] handle_IRQ_event+0x3f/0xd0
 [<c013d1be>] __do_IRQ+0x8e/0xf0
 [<c0106efd>] do_IRQ+0x1d/0x30
 [<c025d2d1>] evtchn_do_upcall+0xa1/0xe0
 [<c0105309>] hypervisor_callback+0x3d/0x48
 [<c01039df>] xen_idle+0x2f/0x60
 [<c0103a82>] cpu_idle+0x72/0xc0
 [<c0102035>] rest_init+0x35/0x40
 [<c035656a>] start_kernel+0x2ea/0x3a0
 [<c010006f>] 0xc010006f

/********************************************************/

What's wrong? Looks like I am really doomed to run into so many weird problems. :(

lily

On 1/12/07, Brendan Cully < brendan@xxxxxxxxx> wrote:

On Friday, 12 January 2007 at 16:10, Lily Huang wrote:
> Oh. I found that gdbserver printed out some error messages:
>
> unsupported xc_ptrace request PTRACE_SETFPXREGS
> unsupported xc_ptrace request PTRACE_SETFPREGS
>
> Are they the reason why the breakpoint does not work?

no, those are fairly harmless.

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