hi,
I'm experiencing regular seg-faults of the xcs daemon during vm
shutdown operations (occurring somewhere between 5 and 25 VMs run,
typically).
xen: unstable patched through 2005-03-07
dom0: linux-2.6.10-xen0 / Fedora Core 3
gcc: 3.4.2 20041017 (Red Hat 3.4.2-6.fc3)
vmtools: 0.0.3 I believe, but they report (-V) 0.0.1, which is not
true
(not using xend)
The errors usually seem to occur while running 'vm-shutdown'.
I have been running 'xcs -i' under gdb and found that, at least twice,
the error is at xen/tools/xcs/ctrl_interface.c:143. Here is the output
of one such session (the error is repeatable enough that I should be
able to provide other info if anyone is interested):
Program received signal SIGSEGV, Segmentation fault.
0x080490b9 in ctrl_chan_request_to_read (cc=0x8050a60) at ctrl_interface.c:143
143 return (RING_HAS_UNCONSUMED_REQUESTS(CTRL_RING, &cc->tx_ring));
(gdb) bt
#0 0x080490b9 in ctrl_chan_request_to_read (cc=0x8050a60) at
ctrl_interface.c:143
#1 0x0804a8d7 in handle_ctrl_if () at xcs.c:550
#2 0x0804ae93 in main (argc=2, argv=0xbffffa74) at xcs.c:737
(gdb) print cc
$1 = (control_channel_t *) 0x8050a60
(gdb) print *cc
$2 = {connected = 1, ref_count = 1, type = 0, remote_dom = 26, local_port = 73,
remote_port = 1,
interface = 0xb7ff0800, tx_ring = {rsp_prod_pvt = 0, req_cons = 0, sring =
0xb7ff0800},
rx_ring = {req_prod_pvt = 0, rsp_cons = 0, sring = 0xb7ff0a08}, virq = 0}
(gdb) print *(cc->tx_ring->sring)
Cannot access memory at address 0xb7ff0800
(gdb) up
#1 0x0804a8d7 in handle_ctrl_if () at xcs.c:550
550 while (ctrl_chan_request_to_read(cc))
(gdb) print chan
$4 = 73
(gdb) print cc_list[chan]
$6 = (control_channel_t *) 0x8050a60
rick
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