Messages in this thread Patch in this message | | | Date | Wed, 08 May 2019 16:24:37 -0400 | From | Steven Rostedt <> | Subject | [for-next][PATCH 10/13] tracing: Allow RCU to run between postponed startup tests |
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From: Anders Roxell <anders.roxell@linaro.org>
When building a allmodconfig kernel for arm64 and boot that in qemu, CONFIG_FTRACE_STARTUP_TEST gets enabled and that takes time so the watchdog expires and prints out a message like this: 'watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [swapper/0:1]' Depending on what the what test gets called from init_trace_selftests() it stays minutes in the loop. Rework so that function cond_resched() gets called in the init_trace_selftests loop.
Link: http://lkml.kernel.org/r/20181130145622.26334-1-anders.roxell@linaro.org
Co-developed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Anders Roxell <anders.roxell@linaro.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> --- kernel/trace/trace.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 3259019cc66d..4269af5905e4 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -1722,6 +1722,10 @@ static __init int init_trace_selftests(void) pr_info("Running postponed tracer tests:\n"); list_for_each_entry_safe(p, n, &postponed_selftests, list) { + /* This loop can take minutes when sanitizers are enabled, so + * lets make sure we allow RCU processing. + */ + cond_resched(); ret = run_tracer_selftest(p->type); /* If the test fails, then warn and remove from available_tracers */ if (ret < 0) { -- 2.20.1
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