[linux-next:master] [kasan] 187292be96: WARNING:suspicious_RCU_usage

From: kernel test robot <oliver.sang@intel.com>
To: Marco Elver <elver@google.com>
Cc: <oe-lkp@lists.linux.dev>, <lkp@intel.com>,
	Linux Memory Management List <linux-mm@kvack.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	"Andrey Konovalov" <andreyknvl@gmail.com>,
	Alexander Potapenko <glider@google.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Andrey Ryabinin <ryabinin.a.a@gmail.com>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Vlastimil Babka <vbabka@suse.cz>, <kasan-dev@googlegroups.com>,
	<oliver.sang@intel.com>
Subject: [linux-next:master] [kasan]  187292be96: WARNING:suspicious_RCU_usage
Date: Tue, 20 Feb 2024 15:34:53 +0800	[thread overview]
Message-ID: <202402201506.b7e4b9b6-oliver.sang@intel.com> (raw)

Hello,

we noticed this is a revert commit, below report is for an issue we observed
on this commit but not on its parent. just FYI.

113edefd366346b3 187292be96ae2be247807fac1c3
---------------- ---------------------------
       fail:runs  %reproduction    fail:runs
           |             |             |
           :6          100%           6:6     dmesg.WARNING:suspicious_RCU_usage

kernel test robot noticed "WARNING:suspicious_RCU_usage" on:

commit: 187292be96ae2be247807fac1c3a6d89a7cc2a84 ("kasan: revert eviction of stack traces in generic mode")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

in testcase: rcutorture
version: 
with following parameters:

	runtime: 300s
	test: cpuhotplug
	torture_type: busted_srcud

compiler: clang-17
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

(please refer to attached dmesg/kmsg for entire log/backtrace)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202402201506.b7e4b9b6-oliver.sang@intel.com

[  292.513535][  T653] WARNING: suspicious RCU usage
[  292.514923][  T653] 6.8.0-rc4-00126-g187292be96ae #1 Not tainted
[  292.516369][  T653] -----------------------------
[  292.517743][  T653] kernel/rcu/rcutorture.c:1983 suspicious rcu_dereference_check() usage!
[  292.519310][  T653]
[  292.519310][  T653] other info that might help us debug this:
[  292.519310][  T653]
[  292.523130][  T653]
[  292.523130][  T653] rcu_scheduler_active = 2, debug_locks = 1
[  292.525644][  T653] no locks held by rcu_torture_rea/653.
[  292.526974][  T653]
[  292.526974][  T653] stack backtrace:
[  292.529271][  T653] CPU: 0 PID: 653 Comm: rcu_torture_rea Not tainted 6.8.0-rc4-00126-g187292be96ae #1
[  292.530780][  T653] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[  292.532329][  T653] Call Trace:
[  292.533524][  T653]  <TASK>
[ 292.534696][ T653] dump_stack_lvl (lib/dump_stack.c:?) 
[ 292.535941][ T653] ? __cfi_dump_stack_lvl (lib/dump_stack.c:98) 
[ 292.537221][ T653] ? lockdep_rcu_suspicious (kernel/locking/lockdep.c:6712) 
[ 292.538523][ T653] rcu_torture_one_read (kernel/rcu/rcutorture.c:?) rcutorture
[ 292.539887][ T653] ? __cfi_lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4312) 
[ 292.541226][ T653] ? rcu_torture_timer (kernel/rcu/rcutorture.c:1955) rcutorture
[ 292.542621][ T653] ? __cfi_rcu_torture_timer (kernel/rcu/rcutorture.c:2055) rcutorture
[ 292.544012][ T653] ? init_timer_key (include/linux/lockdep.h:135 include/linux/lockdep.h:142 include/linux/lockdep.h:148 kernel/time/timer.c:847 kernel/time/timer.c:867) 
[ 292.545262][ T653] rcu_torture_reader (kernel/rcu/rcutorture.c:2093) rcutorture
[ 292.546579][ T653] ? __cfi_rcu_torture_reader (kernel/rcu/rcutorture.c:2076) rcutorture
[ 292.547872][ T653] ? __cfi__raw_spin_unlock_irqrestore (kernel/locking/spinlock.c:193) 
[ 292.549108][ T653] ? __cfi_rcu_torture_timer (kernel/rcu/rcutorture.c:2055) rcutorture
[ 292.550341][ T653] ? __kthread_parkme (kernel/kthread.c:?) 
[ 292.551425][ T653] ? __kthread_parkme (include/linux/instrumented.h:? include/asm-generic/bitops/instrumented-non-atomic.h:141 kernel/kthread.c:280) 
[ 292.552489][ T653] kthread (kernel/kthread.c:390) 
[ 292.553504][ T653] ? __cfi_rcu_torture_reader (kernel/rcu/rcutorture.c:2076) rcutorture
[ 292.554689][ T653] ? __cfi_kthread (kernel/kthread.c:341) 
[ 292.555749][ T653] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 292.556792][ T653] ? __cfi_kthread (kernel/kthread.c:341) 
[ 292.557852][ T653] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
[  292.558920][  T653]  </TASK>

The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240220/202402201506.b7e4b9b6-oliver.sang@intel.com

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki