8:49 a.m.
----- Original Message -----
Hi,
for me crash failed to debug xen environments with:
crash: invalid structure member offset: domain_is_paused_by_controller
FILE: xen_hyper.c LINE: 1255 FUNCTION:
xen_hyper_store_domain_context()
[/usr/bin/crash] error trace: 546170 => 545bc9 => 545a81 => 510fd0
510fd0: OFFSET_verify+224
545a81: xen_hyper_store_domain_context+1265
545bc9: xen_hyper_refresh_domain_context_space+153
546170: xen_hyper_domain_init+864
The problem is a change of an item in struct domain in xen version 4.2
I tried to fix the problem for me so I can debug the old and the newer
xen versions. I'm not sure this was the right way to fix this.
Thanks.
Dietmar.
Your patch looks reasonable. I have two *very* minor nits:
(1) Put the new domain_controller_pause_count at the end of the xen_hyper_offset_table.
In the fairly unlikely event that somebody has an extension module for xen
debugging, it will break unless recompiled.
(2) In xen_hyper_dump_xen_hyper_offset_table(), display both the old and new offsets.
That fact that one or the other shows -1 would be more helpful than not showing it.
Note that these suggestions apply to the mainline offset[] table and the
dump_offset_table()
function.
Thanks,
Dave
diff -pNaur crash-7.1.0-org/xen_hyper.c crash-7.1.0/xen_hyper.c
--- crash-7.1.0-org/xen_hyper.c 2015-02-06 19:44:11.000000000 +0100
+++ crash-7.1.0/xen_hyper.c 2015-03-10 13:57:48.000000000 +0100
@@ -218,7 +218,12 @@ xen_hyper_domain_init(void)
XEN_HYPER_MEMBER_OFFSET_INIT(domain_is_polling, "domain",
"is_polling");
XEN_HYPER_MEMBER_OFFSET_INIT(domain_is_dying, "domain",
"is_dying");
+ /*
+ * In Xen 4.2 is_paused_by_controller changed to
+ * controller_pause_count.
+ */
XEN_HYPER_MEMBER_OFFSET_INIT(domain_is_paused_by_controller, "domain",
"is_paused_by_controller");
+ XEN_HYPER_MEMBER_OFFSET_INIT(domain_controller_pause_count, "domain",
"controller_pause_count");
XEN_HYPER_MEMBER_OFFSET_INIT(domain_is_shutting_down, "domain",
"is_shutting_down");
XEN_HYPER_MEMBER_OFFSET_INIT(domain_is_shut_down, "domain",
"is_shut_down");
XEN_HYPER_MEMBER_OFFSET_INIT(domain_vcpu, "domain", "vcpu");
@@ -1269,9 +1274,15 @@ xen_hyper_store_domain_context(struct xe
*(dp + XEN_HYPER_OFFSET(domain_is_polling))) {
dc->domain_flags |= XEN_HYPER_DOMS_polling;
}
- if (*(dp + XEN_HYPER_OFFSET(domain_is_paused_by_controller))) {
+ if (XEN_HYPER_VALID_MEMBER(domain_is_paused_by_controller) &&
+ *(dp + XEN_HYPER_OFFSET(domain_is_paused_by_controller))) {
dc->domain_flags |= XEN_HYPER_DOMS_ctrl_pause;
}
+ if (XEN_HYPER_VALID_MEMBER(domain_controller_pause_count) &&
+ *(dp + XEN_HYPER_OFFSET(domain_controller_pause_count))) {
+ dc->domain_flags |= XEN_HYPER_DOMS_ctrl_pause;
+ }
+
if (*(dp + XEN_HYPER_OFFSET(domain_is_dying))) {
dc->domain_flags |= XEN_HYPER_DOMS_dying;
}
diff -pNaur crash-7.1.0-org/xen_hyper_defs.h crash-7.1.0/xen_hyper_defs.h
--- crash-7.1.0-org/xen_hyper_defs.h 2015-02-06 19:44:11.000000000 +0100
+++ crash-7.1.0/xen_hyper_defs.h 2015-03-10 13:52:37.000000000 +0100
@@ -679,6 +679,7 @@ struct xen_hyper_offset_table {
long domain_is_polling;
long domain_is_dying;
long domain_is_paused_by_controller;
+ long domain_controller_pause_count;
long domain_is_shutting_down;
long domain_is_shut_down;
long domain_vcpu;
diff -pNaur crash-7.1.0-org/xen_hyper_dump_tables.c
crash-7.1.0/xen_hyper_dump_tables.c
--- crash-7.1.0-org/xen_hyper_dump_tables.c 2015-02-06 19:44:11.000000000
+0100
+++ crash-7.1.0/xen_hyper_dump_tables.c 2015-03-10 14:00:20.000000000 +0100
@@ -784,8 +784,14 @@ xen_hyper_dump_xen_hyper_offset_table(ch
}
XEN_HYPER_PRI(fp, len, "domain_is_dying: ", buf, flag,
(buf, "%ld\n", xen_hyper_offset_table.domain_is_dying));
- XEN_HYPER_PRI(fp, len, "domain_is_paused_by_controller: ", buf, flag,
- (buf, "%ld\n", xen_hyper_offset_table.domain_is_paused_by_controller));
+ if (XEN_HYPER_VALID_MEMBER(domain_is_paused_by_controller)) {
+ XEN_HYPER_PRI(fp, len, "domain_is_paused_by_controller: ", buf, flag,
+ (buf, "%ld\n", xen_hyper_offset_table.domain_is_paused_by_controller));
+ }
+ if (XEN_HYPER_VALID_MEMBER(domain_controller_pause_count)) {
+ XEN_HYPER_PRI(fp, len, "domain_controller_pause_count: ", buf, flag,
+ (buf, "%ld\n", xen_hyper_offset_table.domain_controller_pause_count));
+ }
XEN_HYPER_PRI(fp, len, "domain_is_shutting_down: ", buf, flag,
(buf, "%ld\n", xen_hyper_offset_table.domain_is_shutting_down));
XEN_HYPER_PRI(fp, len, "domain_is_shut_down: ", buf, flag,
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