Messages in this thread Patch in this message | | | From | Josef Bacik <> | Subject | [PATCH] trace-cmd: make sure we have a pending pid in trace-hist | Date | Wed, 30 Jul 2014 16:54:45 -0400 |
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I have a trace.dat file where we lost some events and so we didn't have the corresponding event to go with the stack trace. This made trace-cmd hist segfault because it unconditionally pushes the pending_pid's function onto the stack trace. In this case pending_pid < 0, which means we didn't have a pending stack trace, so we got garbage in the call chain and hilarity ensued. Fix this by only pushing the pending call chain if there actually is one, and also don't reset the current call chain if there isn't actually one there either. This fixed my segfault. Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com> --- Makefile | 9 +++++---- trace-cmd.c | 3 +++ trace-hist.c | 14 +++++++++----- trace-local.h | 2 ++ trace-usage.c | 5 +++++ 5 files changed, 24 insertions(+), 9 deletions(-)
diff --git a/Makefile b/Makefile index cbe0eb9..0a46125 100644 --- a/Makefile +++ b/Makefile @@ -81,7 +81,7 @@ ifndef NO_PYTHON PYTHON := ctracecmd.so PYTHON_GUI := ctracecmd.so ctracecmdgui.so -PYTHON_VERS ?= python +PYTHON_VERS ?= python-2.7 # Can build python? ifeq ($(shell sh -c "pkg-config --cflags $(PYTHON_VERS) > /dev/null 2>&1 && echo y"), y) @@ -164,6 +164,7 @@ LIBS = -L. -ltracecmd -ldl LIB_FILE = libtracecmd.a PACKAGES= gtk+-2.0 libxml-2.0 gthread-2.0 +NOGUI_PACKAGES= glib-2.0 ifndef BUILDGUI BUILDGUI = 0 @@ -194,8 +195,8 @@ N = @/bin/true || CONFIG_FLAGS += $(HELP_DIR_SQ) else -CONFIG_INCLUDES = -CONFIG_LIBS = +CONFIG_INCLUDES = $(shell pkg-config --cflags $(NOGUI_PACKAGES)) +CONFIG_LIBS = $(shell pkg-config --libs $(NOGUI_PACKAGES)) CONFIG_FLAGS = VERSION = $(TC_VERSION) @@ -307,7 +308,7 @@ $(obj)/%.o: $(src)/%.c TRACE_GUI_OBJS = trace-filter.o trace-compat.o trace-hash.o trace-dialog.o \ trace-xml.o TRACE_CMD_OBJS = trace-cmd.o trace-record.o trace-read.o trace-split.o trace-listen.o \ - trace-stack.o trace-hist.o trace-mem.o trace-snapshot.o + trace-stack.o trace-hist.o trace-mem.o trace-snapshot.o trace-latency.o TRACE_VIEW_OBJS = trace-view.o trace-view-store.o TRACE_GRAPH_OBJS = trace-graph.o trace-plot.o trace-plot-cpu.o trace-plot-task.o TRACE_VIEW_MAIN_OBJS = trace-view-main.o $(TRACE_VIEW_OBJS) $(TRACE_GUI_OBJS) diff --git a/trace-cmd.c b/trace-cmd.c index ebf9c7a..a8ecad6 100644 --- a/trace-cmd.c +++ b/trace-cmd.c @@ -432,6 +432,9 @@ int main (int argc, char **argv) } else if (strcmp(argv[1], "stack") == 0) { trace_stack(argc, argv); exit(0); + } else if (strcmp(argv[1], "latency") == 0) { + trace_latency(argc, argv); + exit(0); } else if (strcmp(argv[1], "check-events") == 0) { char *tracing; int ret; diff --git a/trace-hist.c b/trace-hist.c index 73820de..574549e 100644 --- a/trace-hist.c +++ b/trace-hist.c @@ -453,9 +453,11 @@ process_kernel_stack(struct pevent *pevent, struct pevent_record *record) } } else { /* function stack trace? */ - copy_stack_to_pending(current_pid); - free(ips); - reset_stack(); + if (current_pid >= 0) { + copy_stack_to_pending(current_pid); + free(ips); + reset_stack(); + } } current_pid = pid; @@ -482,8 +484,10 @@ process_kernel_stack(struct pevent *pevent, struct pevent_record *record) push_stack_func(func); } - push_stack_func(pending_ips[pending_ips_idx - 1]); - reset_pending_stack(); + if (pending_pid >= 0) { + push_stack_func(pending_ips[pending_ips_idx - 1]); + reset_pending_stack(); + } save_call_chain(current_pid, ips, ips_idx, 1); if (do_restore) restore_stack(current_pid); diff --git a/trace-local.h b/trace-local.h index 3c82c2f..1d6d69b 100644 --- a/trace-local.h +++ b/trace-local.h @@ -57,6 +57,8 @@ void trace_snapshot(int argc, char **argv); void trace_mem(int argc, char **argv); +void trace_latency(int argc, char **argv); + /* --- instance manipulation --- */ struct func_list { diff --git a/trace-usage.c b/trace-usage.c index 0dec87e..ef73551 100644 --- a/trace-usage.c +++ b/trace-usage.c @@ -231,6 +231,11 @@ static struct usage_help usage_help[] = { " -N do not load any plugins\n" }, { + "latency", + "parse latency events", + "" + }, + { NULL, NULL, NULL } }; -- 2.0.0
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