Invalid ring order: 0
Closed this issue · 6 comments
talex5 commented
(see QubesOS/qubes-issues#1644)
mirage-firewall sometimes seems to fail to respond to qrexec commands over vchan. On both occasions I saw, the previous vchan-related message in the log (much earlier) was Invalid ring order: 0:
WRN [qubes.rexec] Error setting up vchan (domain 0, port 513): Failure("Invalid ring order: 0")
INF [qubes.rexec] Execute "root:date -s \"Sun 7 Feb 16:22:35 GMT 2016\"\000"
WRN [command] << Unknown command "date -s \"Sun 7 Feb 16:22:35 GMT 2016\""
WRN [qubes.rexec] Error setting up vchan (domain 0, port 514): Failure("Invalid ring order: 0")
INF [qubes.rexec] Execute "root:date -s \"Tue 9 Feb 18:08:35 GMT 2016\"\000"
Need to find out why this happens and why it seems to mess up the next vchan connection.
talex5 commented
Dumping the vchan interface page on error shows it is all zeros:
2016-02-10 12:14.21: INF [qubes.rexec] Execute "root:QUBESRPC qubes.SetDateTime dom0\000"
try_of_order: get_lo: Invalid ring order: 0
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
2016-02-10 12:14.21: WRN [qubes.rexec] Error setting up vchan (domain 0, port 513): Failure("Invalid ring order: 0")
talex5 commented
Possibly related (on resuming laptop from suspend):
2016-02-11 02:03.52: WRN [command] << Unknown command "QUBESRPC qubes.SetMonitorLayout dom0"
ERROR: bind_interdomain failed with rc=-22Page fault at linear address 18001df968, rip fe9d0, regs 000000000021fac8, sp 21fb70, our_sp 000000000021fa90, code 0
RIP: e030:[<00000000000fe9d0>]
RSP: e02b:000000000021fb70 EFLAGS: 00010002
RAX: 00000002fffffffd RBX: 00000000ffffffff RCX: 000000000140e000
RDX: 0000000000000001 RSI: ffffffffffffffff RDI: 00000000ffffffff
RBP: 00000000ffffffff R08: 000000000025f0b0 R09: 000000000021fa60
R10: 000ffffffffff000 R11: 00000000001d7510 R12: 0000000000043e97
R13: 00000000011e79b8 R14: 000000000021fc80 R15: 00000000011e3088
base is 0xffffffff Page fault in pagetable walk (access to invalid memory?).
talex5 commented
-22 is EINVAL from Xen. Possible causes:
- Remote port is invalid
- Remote domain is dying
- Already bound
- Intended for a different domain
marmarek commented
I guess mapping control page failed for some reason.
Check if prior to the connection there is no xenstore entries for vchan. If there is any (with the same port number) it may be used by vchan client, before server writes new ones there.
Does vchan client side wait for server to setup? I see this: https://github.com/mirage/ocaml-vchan/blob/master/lib/endpoint.ml#L445 and https://github.com/mirage/ocaml-vchan/blob/master/lib/xenstore.ml#L53-L60, but I don't know Ocaml enough to understand if those places are even related...
I would debug it by logging actually used ring-ref and even-channel number.
talex5 commented
I think those are the right places. The vchan code is specialised to Xen in https://github.com/mirage/ocaml-vchan/blob/master/xen/vchan_xen.ml:
include Vchan.Endpoint.Make(Events_xen)(Memory_xen)(Vchan.Xenstore.Make(OS.Xs))
so C is Vchan.Xenstore.Make(OS.Xs). If it gets any error trying to read the values, it returns fail Xs_protocol.Eagain, which will wait for the next change to those keys in XenStore and try the code again.
It doesn't happen very often though. I'll add some logging as you suggest...
talex5 commented
Haven't seen this bug for a few years now, so closing.