linux-kernel - Re: [PATCH 0/9] TRACE

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Date:   Thu, 20 Aug 2020 10:36:43 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org, will@...nel.org,
        npiggin@...il.com, elver@...gle.com, jgross@...e.com,
        paulmck@...nel.org, rjw@...ysocki.net, joel@...lfernandes.org,
        svens@...ux.ibm.com, tglx@...utronix.de
Subject: Re: [PATCH 0/9] TRACE_IRQFLAGS wreckage


I tested this series on top of tip/master and triggered the below
warning when running the irqsoff tracer boot up test (config attached).

-- Steve

 Testing tracer irqsoff: 
 
 =============================
 WARNING: suspicious RCU usage
 5.9.0-rc1-test+ #92 Not tainted
 -----------------------------
 include/trace/events/lock.h:13 suspicious rcu_dereference_check() usage!
 
 other info that might help us debug this:
 
 
 rcu_scheduler_active = 2, debug_locks = 1
 RCU used illegally from extended quiescent state!
 no locks held by swapper/2/0.
 
 stack backtrace:
 CPU: 2 PID: 0 Comm: swapper/2 Not tainted 5.9.0-rc1-test+ #92
 Hardware name: Hewlett-Packard HP Compaq Pro 6300 SFF/339A, BIOS K01 v03.03 07/14/2016
 Call Trace:
  dump_stack+0x8d/0xc0
  lock_acquire.cold+0x23/0x2c
  ? default_idle_call+0x4d/0x210
  _raw_spin_lock_irqsave+0x50/0xa0
  ? check_critical_timing+0x69/0x160
  check_critical_timing+0x69/0x160
  ? default_idle_call+0x4d/0x210
  stop_critical_timings+0xdd/0xf0
  default_idle_call+0x4d/0x210
  do_idle+0x1f6/0x260
  cpu_startup_entry+0x19/0x20
  start_secondary+0x110/0x140
  secondary_startup_64+0xb6/0xc0