Commit 7ed97ad4 authored by David Ahern's avatar David Ahern Committed by Arnaldo Carvalho de Melo

perf kvm: Fix segfault with report and mixed guestmount use

Using the guestmount option on record:
    $ perf kvm --guest --host --guestmount=/tmp/guest-mount record -ag

But not the subsequent report:
    $ perf kvm report

causes a SEGFAULT in the usual place:
(gdb) bt
0  0x0000000000470356 in machine__mmap_name (self=0x0, bf=0x7fffffffbdb0 " z\370\367\377\177", size=
    4096) at util/map.c:712
1  0x00000000004453e8 in perf_event__process_kernel_mmap (tool=0x7fffffffde10, event=0x7ffff7f87e38,
    machine=0x0) at util/event.c:550
2  0x00000000004458c9 in perf_event__process_mmap (tool=0x7fffffffde10, event=0x7ffff7f87e38, sample=
    0x7fffffffd2a0, machine=0x0) at util/event.c:656
3  0x00000000004733e0 in perf_session_deliver_event (session=0x91aca0, event=0x7ffff7f87e38, sample=
    0x7fffffffd2a0, tool=0x7fffffffde10, file_offset=7736) at util/session.c:979
...

The MMAP events in this case already contain the full path to the
module. No need to require it for the report path to.
Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1341241977-71535-1-git-send-email-dsahern@gmail.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 207b5792
...@@ -669,25 +669,26 @@ struct machine *machines__find(struct rb_root *self, pid_t pid) ...@@ -669,25 +669,26 @@ struct machine *machines__find(struct rb_root *self, pid_t pid)
struct machine *machines__findnew(struct rb_root *self, pid_t pid) struct machine *machines__findnew(struct rb_root *self, pid_t pid)
{ {
char path[PATH_MAX]; char path[PATH_MAX];
const char *root_dir; const char *root_dir = "";
struct machine *machine = machines__find(self, pid); struct machine *machine = machines__find(self, pid);
if (!machine || machine->pid != pid) { if (machine && (machine->pid == pid))
if (pid == HOST_KERNEL_ID || pid == DEFAULT_GUEST_KERNEL_ID) goto out;
root_dir = "";
else { if ((pid != HOST_KERNEL_ID) &&
if (!symbol_conf.guestmount) (pid != DEFAULT_GUEST_KERNEL_ID) &&
goto out; (symbol_conf.guestmount)) {
sprintf(path, "%s/%d", symbol_conf.guestmount, pid); sprintf(path, "%s/%d", symbol_conf.guestmount, pid);
if (access(path, R_OK)) { if (access(path, R_OK)) {
pr_err("Can't access file %s\n", path); pr_err("Can't access file %s\n", path);
goto out; machine = NULL;
} goto out;
root_dir = path;
} }
machine = machines__add(self, pid, root_dir); root_dir = path;
} }
machine = machines__add(self, pid, root_dir);
out: out:
return machine; return machine;
} }
......
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