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** Bug watch added: Linux Kernel Bug Tracker #214185
https://bugzilla.kernel.org/show_bug.cgi?id=214185
** Also affects: linux via
https://bugzilla.kernel.org/show_bug.cgi?id=214185
Importance: Unknown
Status: Unknown
** Changed in: ubuntu-kernel-tests
Importance: Undecided =>
the RCU timeout was a red-herring; it occurs during the filter set-up.
The actual test to find the stack tracer traced stack sizes is running
w/o causing RCU soft lockup messages but it is failing to find the
kernel function names that match the *lock* regex, so that's a bug.
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... I've looked at this test and the following occurs:
0. go to the tracking directory:
cd /sys/kernel/debug/tracing
1. tracer is disabled:
echo 0 > /proc/sys/kernel/stack_tracer_enabled
2. tracer is set to track all kernel functions with *lock* in the name:
echo '*lock*' > stack_trace_filter
FYI, to debug the test script use:
impish/tools/testing/selftests/ftrace$ sudo ./ftracetest
test.d/ftrace/func_stack_tracer.tc -v -d
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https://bugs.launchpad.net/bugs/1940972
Title:
v5.
The test script adds a tracing filter:
echo '*lock*' > stack_trace_filter
..that takes a few minutes to apply and during that time we see the RCU
and/or softlockup messages. This is kind of expected since we're blocked
in kernel space updating ftrace points across the kernel which is slow
and exp
[10052.121189] rcu: INFO: rcu_sched self-detected stall on CPU
[10052.126125] rcu: 1-: (14995 ticks this GP)
idle=a3a/1/0x4002 softirq=116019/116019 fqs=7426
[10080.057250] watchdog: BUG: soft lockup - CPU#1 stuck for 82s!
[ftracetest:30662]
[10124.057368] watchdog: BUG: soft
** Description changed:
$ sudo make -C tools/testing/selftests TARGETS=ftrace run_tests
...
# [32] ftrace - Max stack tracer [FAIL]
...
+ Testing using 5.13.0-1002.2
- Testing using 5.13.0-1002.2
+ the full ftrace suite takes just over 2 hours on unmatched.
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