RE: [Xen-devel] monitoring all xenstore 'traffic'

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> 
> You must set
> export XENSTORED_TRACE=1
> before starting xend. You can search for XENSTORED_TRACE in
/usr/bin/xend.
> Then a trace file /var/log/xen/xenstored-trace.log is written.
> You will see such lines:
> IN  0x516a70 20081010 08:20:33 GET_DOMAIN_PATH (1 )
> OUT 0x516a70 20081010 08:20:33 GET_DOMAIN_PATH (/local/domain/1 )
> IN  0x5373e0 20081010 08:20:33 READ (/local/domain/1/serial/0/ring-ref
)
> OUT 0x5373e0 20081010 08:20:33 ERROR (ENOENT )
> 

Should xend restart without any problems?
After restarting xend, xenstore-ls just says:

"
tool = ""
 xenstored = ""
vm = ""
Segmentation fault

Message from syslogd@bitvs2 at Fri Nov  7 21:33:34 2008 ...
bitvs2 kernel: invalid opcode: 0000 [3] SMP
"

And this is in dmesg:

"
----------- [cut here ] --------- [please bite here ] ---------
Kernel BUG at drivers/xen/xenbus/xenbus_dev.c:112
invalid opcode: 0000 [4] SMP
CPU 0
Modules linked in: iptable_filter ip_tables ipmi_poweroff ipmi_si
ipmi_devintf ipmi_msghandler tun tcp_diag inet_diag mptctl mptbase
xt_physdev x_tables ppdev parport_pc lp parport button ac battery ipv6
bridge fuse xen_scsibk eeprom sg 8021q netloop loop shpchp pci_hotplug
serial_core pcspkr i2c_nforce2 i2c_core st tsdev evdev xfs dm_mirror
dm_snapshot dm_mod raid1 md_mod ide_generic ide_cd cdrom sata_nv libata
usbhid cciss tg3 generic aic7xxx scsi_transport_spi scsi_mod amd74xx
ohci_hcd ehci_hcd ide_core fan
Pid: 17077, comm: xenstore-ls Not tainted 2.6.18-6-xen-amd64 #1
RIP: e030:[<ffffffff80369201>]  [<ffffffff80369201>]
queue_reply+0x61/0x93
RSP: e02b:ffff88000c9e9e88  EFLAGS: 00010206
RAX: 0000000000001248 RBX: ffff880035abc000 RCX: 0000000000001238
RDX: 0000000000001200 RSI: ffff880035abd239 RDI: ffff880018152048
RBP: ffff880018150000 R08: ffff880018152038 R09: 0000000000000000
R10: ffff880018150024 R11: ffff88003a218770 R12: ffff880018152048
R13: 0000000000001238 R14: ffff880018150024 R15: 0000000000602100
FS:  00002adefe772af0(0000) GS:ffffffff804c3000(0000)
knlGS:0000000000000000
CS:  e033 DS: 0000 ES: 0000
Process xenstore-ls (pid: 17077, threadinfo ffff88000c9e8000, task
ffff88003a218770)
Stack:  0000000000000001  0000000000000000  ffff880018150000
0000000000000001
 ffff880035abc000  ffffffff803695c5  ffff88003a218770  0000000000000004
 0000000000000000  0000000200000000
Call Trace:
 [<ffffffff803695c5>] xenbus_dev_write+0x18a/0x33f
 [<ffffffff80216ac9>] vfs_write+0xce/0x174
 [<ffffffff802172ec>] sys_write+0x45/0x6e
 [<ffffffff8025be4a>] system_call+0x86/0x8b
 [<ffffffff8025bdc4>] system_call+0x0/0x8b


Code: 0f 0b 68 2e e8 41 80 c2 70 00 4c 89 e7 e8 db 5c ef ff 41 58
RIP  [<ffffffff80369201>] queue_reply+0x61/0x93
 RSP <ffff88000c9e9e88>
"

Good thing I'm using my dev machine :)

Thanks

James


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