Sending monitors config to all agents will results in unnecessary work
from some of them, or racy behaviour. Currently, several session agent
sharing the same X session may want to create or modify the same mode
resulting in X errors:
spice-vdagent[2985]: received monitor 0 config 1440x823+0+0
spice-vdagent[2985]: after zeroing: 1, 1
spice-vdagent[2985]: received monitor 0 config 1440x823+0+0
X Error of failed request: BadName (named color or font does not exist)
Major opcode of failed request: 139 (RANDR)
Minor opcode of failed request: 16 (RRCreateMode)
Serial number of failed request: 52
Current serial number in output stream: 52
(gdb) bt
width=1440, height=823) at src/vdagent-x11-randr.c:310
x=0, y=0, width=1440, height=823) at src/vdagent-x11-randr.c:336
mon_config=0x61a020) at src/vdagent-x11-randr.c:662
On server side, the error is triggered when the second RRModeCreateUser is received:
Breakpoint 1, RRModeCreateUser (pScreen=0xb36700, modeInfo=0xbfd7d8, name=0xbfd7f8 "vdagent-0", error=0x7ffff4dcb794) at rrmode.c:146
146 mode = RRModeFindByName(name, modeInfo->nameLength);
(gdb) n
147 if (mode) {
(gdb)
148 *error = BadName;
(gdb)
149 return NULL;
https://bugzilla.redhat.com/show_bug.cgi?id=872633
---
src/vdagentd.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/src/vdagentd.c b/src/vdagentd.c
index a4db935..02e73ca 100644
--- a/src/vdagentd.c
+++ b/src/vdagentd.c
@@ -130,9 +130,9 @@ static void do_client_monitors(struct vdagent_virtio_port *vport, int port_nr,
}
memcpy(mon_config, new_monitors, size);
- /* Send monitor config to currently connected agents */
- udscs_server_write_all(server, VDAGENTD_MONITORS_CONFIG, 0, 0,
- (uint8_t *)mon_config, size);
+ /* Send monitor config to currently active agent */
+ udscs_write(active_session_conn, VDAGENTD_MONITORS_CONFIG, 0, 0,
+ (uint8_t *)mon_config, size);
/* Acknowledge reception of monitors config to spice server / client */
reply.type = VD_AGENT_MONITORS_CONFIG;
--
1.7.11.7
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