linux-kernel - Re: power-off delay/hang due to commit 6d25be57 (mainline)

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Message-ID: <87tuzbh482.fsf@gmx.net>
Date:   Tue, 16 Jun 2020 09:14:37 +0200
From:   Stephen Berman <stephen.berman@....net>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: power-off delay/hang due to commit 6d25be57 (mainline)

On Mon, 15 Jun 2020 16:51:30 +0200 Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:

> I attached a modified acpi_dbg.patch. Please enable:
> - CONFIG_ACPI_DEBUG=y
>
> Looking at your 5.1 you have tracing enabled (hope it still is).
>
> The attached patch will dump the date into the tracing buffer, so you
> console should remain "clean". Once it records 300 of those "requests
> for acpi_ev_notify_dispatch" it will stop recording.
> After 4-5 minutes please do
> 	cat /sys/kernel/debug/tracing/trace > file.txt
>
> compress it and send it.

I set CONFIG_ACPI_DEBUG=y, applied the patch and rebuilt 5.6.4, but:

$ cat /sys/kernel/debug/tracing/trace > trace.txt
cat: /sys/kernel/debug/tracing/trace: No such file or directory

Here are all the 5.6.4 config options with "TRACING" or "TRACE"; do I
need to set any that aren't set?

CONFIG_SYSCTL_EXCEPTION_TRACE=y
CONFIG_TRACEPOINTS=y
CONFIG_STACKTRACE_SUPPORT=y
CONFIG_PM_TRACE=y
CONFIG_PM_TRACE_RTC=y
CONFIG_HAVE_KPROBES_ON_FTRACE=y
CONFIG_HAVE_ARCH_TRACEHOOK=y
CONFIG_HAVE_RELIABLE_STACKTRACE=y
# CONFIG_MAC80211_MESSAGE_TRACING is not set
# CONFIG_DMA_FENCE_TRACE is not set
CONFIG_IWLWIFI_DEVICE_TRACING=y
# CONFIG_TRACE_SINK is not set
# HW tracing support
# end of HW tracing support
CONFIG_STACKTRACE=y
CONFIG_RCU_TRACE=y
CONFIG_USER_STACKTRACE_SUPPORT=y
CONFIG_NOP_TRACER=y
CONFIG_HAVE_FUNCTION_TRACER=y
CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y
CONFIG_HAVE_DYNAMIC_FTRACE=y
CONFIG_HAVE_DYNAMIC_FTRACE_WITH_REGS=y
CONFIG_HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS=y
CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y
CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
CONFIG_TRACE_CLOCK=y
CONFIG_EVENT_TRACING=y
CONFIG_CONTEXT_SWITCH_TRACER=y
CONFIG_TRACING=y
CONFIG_GENERIC_TRACER=y
CONFIG_TRACING_SUPPORT=y
CONFIG_FTRACE=y
# CONFIG_BOOTTIME_TRACING is not set
# CONFIG_FUNCTION_TRACER is not set
# CONFIG_STACK_TRACER is not set
# CONFIG_IRQSOFF_TRACER is not set
# CONFIG_SCHED_TRACER is not set
# CONFIG_HWLAT_TRACER is not set
# CONFIG_MMIOTRACE is not set
# CONFIG_FTRACE_SYSCALLS is not set
# CONFIG_TRACER_SNAPSHOT is not set
CONFIG_BLK_DEV_IO_TRACE=y
# CONFIG_TRACE_EVENT_INJECT is not set
# CONFIG_TRACEPOINT_BENCHMARK is not set
# CONFIG_TRACE_EVAL_MAP_FILE is not set
# CONFIG_FTRACE_STARTUP_TEST is not set
CONFIG_TRACE_IRQFLAGS_SUPPORT=y
CONFIG_HAVE_MMIOTRACE_SUPPORT=y
CONFIG_CC_HAS_SANCOV_TRACE_PC=y
# CONFIG_BACKTRACE_SELF_TEST is not set

Steve Berman