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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] Domain core-dumping fixes
# HG changeset patch
# User John Levon <john.levon@xxxxxxx>
# Date 1236822336 25200
# Node ID 88b3a560b0fb2a5adca969d9b192220d64dfd105
# Parent e92a56f3581975496d5d9f250823e46493e58548
Domain core-dumping fixes
The code was attempting to use the domain's current number of pages
(info.nr_pages) as a maximum index. We then walk the memory map and can
easily over-write past the end of the nr_pages-sized array, if the
domain has more pages mapped in than earlier (live dump). Restrict
ourselves to the current number of pages.
Also fix the dump core method in xend to actually implement the crash
and live options. In particular this means that xend clients other than
xm now get non-live dumps by default.
Signed-off-by: John Levon <john.levon@xxxxxxx>
diff --git a/tools/libxc/xc_core.c b/tools/libxc/xc_core.c
--- a/tools/libxc/xc_core.c
+++ b/tools/libxc/xc_core.c
@@ -518,7 +518,17 @@ xc_domain_dumpcore_via_callback(int xc_h
if ( sts != 0 )
goto out;
+ /*
+ * Note: this is the *current* number of pages and may change under
+ * a live dump-core. We'll just take this value, and if more pages
+ * exist, we'll skip them. If there's less, then we'll just not use
+ * all the array...
+ *
+ * We don't want to use the total potential size of the memory map
+ * since that is usually much higher than info.nr_pages.
+ */
nr_pages = info.nr_pages;
+
if ( !auto_translated_physmap )
{
/* obtain p2m table */
@@ -770,7 +780,7 @@ xc_domain_dumpcore_via_callback(int xc_h
pfn_start = memory_map[map_idx].addr >> PAGE_SHIFT;
pfn_end = pfn_start + (memory_map[map_idx].size >> PAGE_SHIFT);
- for ( i = pfn_start; i < pfn_end; i++ )
+ for ( i = pfn_start; i < pfn_end && j < nr_pages; i++ )
{
uint64_t gmfn;
void *vaddr;
diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -158,7 +158,7 @@ typedef struct xc_dominfo {
paused:1, blocked:1, running:1,
hvm:1, debugged:1;
unsigned int shutdown_reason; /* only meaningful if shutdown==1 */
- unsigned long nr_pages;
+ unsigned long nr_pages; /* current number, not maximum */
unsigned long shared_info_frame;
uint64_t cpu_time;
unsigned long max_memkb;
diff --git a/tools/python/xen/xend/XendDomain.py
b/tools/python/xen/xend/XendDomain.py
--- a/tools/python/xen/xend/XendDomain.py
+++ b/tools/python/xen/xend/XendDomain.py
@@ -1252,13 +1252,23 @@ class XendDomain:
POWER_STATE_NAMES[DOM_STATE_PAUSED],
POWER_STATE_NAMES[dominfo._stateGet()])
- try:
- log.info("Domain core dump requested for domain %s (%d) "
- "live=%d crash=%d.",
- dominfo.getName(), dominfo.getDomid(), live, crash)
- return dominfo.dumpCore(filename)
- except Exception, ex:
- raise XendError(str(ex))
+ dopause = (not live and dominfo._stateGet() == DOM_STATE_RUNNING)
+ if dopause:
+ dominfo.pause()
+
+ try:
+ try:
+ log.info("Domain core dump requested for domain %s (%d) "
+ "live=%d crash=%d.",
+ dominfo.getName(), dominfo.getDomid(), live, crash)
+ dominfo.dumpCore(filename)
+ if crash:
+ self.domain_destroy(domid)
+ except Exception, ex:
+ raise XendError(str(ex))
+ finally:
+ if dopause and not crash:
+ dominfo.unpause()
def domain_destroy(self, domid):
"""Terminate domain immediately.
diff --git a/tools/python/xen/xend/XendDomainInfo.py
b/tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py
+++ b/tools/python/xen/xend/XendDomainInfo.py
@@ -2036,26 +2036,31 @@ class XendDomainInfo:
@raise: XendError if core dumping failed.
"""
+ if not corefile:
+ this_time = time.strftime("%Y-%m%d-%H%M.%S", time.localtime())
+ corefile = "/var/xen/dump/%s-%s.%s.core" % (this_time,
+ self.info['name_label'], self.domid)
+
+ if os.path.isdir(corefile):
+ raise XendError("Cannot dump core in a directory: %s" %
+ corefile)
+
try:
- if not corefile:
- this_time = time.strftime("%Y-%m%d-%H%M.%S", time.localtime())
- corefile = "/var/xen/dump/%s-%s.%s.core" % (this_time,
- self.info['name_label'], self.domid)
-
- if os.path.isdir(corefile):
- raise XendError("Cannot dump core in a directory: %s" %
- corefile)
-
- self._writeVm(DUMPCORE_IN_PROGRESS, 'True')
- xc.domain_dumpcore(self.domid, corefile)
+ try:
+ self._writeVm(DUMPCORE_IN_PROGRESS, 'True')
+ xc.domain_dumpcore(self.domid, corefile)
+ except RuntimeError, ex:
+ corefile_incomp = corefile+'-incomplete'
+ try:
+ os.rename(corefile, corefile_incomp)
+ except:
+ pass
+
+ log.error("core dump failed: id = %s name = %s: %s",
+ self.domid, self.info['name_label'], str(ex))
+ raise XendError("Failed to dump core: %s" % str(ex))
+ finally:
self._removeVm(DUMPCORE_IN_PROGRESS)
- except RuntimeError, ex:
- corefile_incomp = corefile+'-incomplete'
- os.rename(corefile, corefile_incomp)
- self._removeVm(DUMPCORE_IN_PROGRESS)
- log.exception("XendDomainInfo.dumpCore failed: id = %s name = %s",
- self.domid, self.info['name_label'])
- raise XendError("Failed to dump core: %s" % str(ex))
#
# Device creation/deletion functions
diff --git a/tools/python/xen/xm/main.py b/tools/python/xen/xm/main.py
--- a/tools/python/xen/xm/main.py
+++ b/tools/python/xen/xm/main.py
@@ -1351,22 +1351,10 @@ def xm_dump_core(args):
else:
filename = None
- if not live:
- ds = server.xend.domain.pause(dom, True)
-
- try:
- print "Dumping core of domain: %s ..." % str(dom)
- server.xend.domain.dump(dom, filename, live, crash)
-
- if crash:
- print "Destroying domain: %s ..." % str(dom)
- server.xend.domain.destroy(dom)
- elif reset:
- print "Resetting domain: %s ..." % str(dom)
- server.xend.domain.reset(dom)
- finally:
- if not live and not crash and not reset and ds == DOM_STATE_RUNNING:
- server.xend.domain.unpause(dom)
+ print "Dumping core of domain: %s ..." % str(dom)
+ server.xend.domain.dump(dom, filename, live, crash)
+ if reset:
+ server.xend.domain.reset(dom)
def xm_rename(args):
arg_check(args, "rename", 2)
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