On 2023/9/6 21:02, Steven Rostedt wrote:
On Wed, 6 Sep 2023 08:56:21 -0400
Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
On Wed, 6 Sep 2023 19:57:24 +0800
Zheng Yejian <zhengyejian1@xxxxxxxxxx> wrote:
BTW, I do reproduce with following testcase fix, then just run:
./ftracetest test.d/instances/instance-event.tc
diff --git
a/tools/testing/selftests/ftrace/test.d/instances/instance-event.tc
b/tools/testing/selftests/ftrace/test.d/instances/instance-event.tc
index 0eb47fbb3f44..42422e425107 100644
--- a/tools/testing/selftests/ftrace/test.d/instances/instance-event.tc
+++ b/tools/testing/selftests/ftrace/test.d/instances/instance-event.tc
@@ -39,7 +39,7 @@ instance_read() {
instance_set() {
while :; do
- echo 1 > foo/events/sched/sched_switch
+ echo 1 > foo/events/sched/sched_switch/enable
done 2> /dev/null
}
Ah thanks. I didn't have that on my test box :-p
Although I'm still having issues reproducing it. Do you have anything
special on your kernel command line?
I can reproduce it on qemu, boot command seems nothing special (replace
${kernel} with bzImage path and replace ${rootfs} with a ubuntu image):
qemu-system-x86_64 -M pc -m 8G -enable-kvm -smp cpus=12 -kernel
${kernel} -drive file=${rootfs},if=virtio,format=raw,id=hd0 -fsdev
local,security_model=passthrough,id=fsdev0,path=/home/test -nographic
-append "rootwait root=/dev/vda rw console=ttyS0 rodata=off"
Also, which branch are you testing? What's the sha of the code you are testing?
I think it can be reproduced after any commit after commit
27152bceea1d ("eventfs: Move tracing/events to eventfs")
also can be reproduced with the newest:
65d6e954e378 ("Merge tag 'gfs2-v6.5-rc5-fixes' of
git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2")
And revert commit 27152bceea1d ("eventfs: Move tracing/events to
eventfs"), the issue just seems gone.
--
Thanks,
Zheng Yejian
-- Steve
