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McKenney" CC: , , , Mathieu Desnoyers , Steven Rostedt , Sebastian Andrzej Siewior , , Subject: Re: [paulmck-rcu:dev.2025.08.13a] [tracing] 364ac25d46: WARNING:at_arch/x86/mm/fault.c:#do_user_addr_fault Message-ID: References: <202508211038.c93e8603-lkp@intel.com> <68044ea3-32c1-4d72-9bd3-fe2031669d79@paulmck-laptop> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <68044ea3-32c1-4d72-9bd3-fe2031669d79@paulmck-laptop> X-ClientProxiedBy: SG2PR02CA0110.apcprd02.prod.outlook.com (2603:1096:4:92::26) To LV3PR11MB8603.namprd11.prod.outlook.com (2603:10b6:408:1b6::9) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV3PR11MB8603:EE_|DM4PR11MB6094:EE_ X-MS-Office365-Filtering-Correlation-Id: f267facd-8767-408c-5c8c-08ddea8a1140 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024; 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McKenney wrote: > On Thu, Aug 21, 2025 at 01:26:45PM +0800, kernel test robot wrote: > > > > hi, Paul, > > > > we also noticed there is similar commit in newer branch > > dev.2025.08.14a > > dev.2025.08.19a > > but we didn't finish any bisect for them so far. > > > > if the issue is already known and fixed in newer version, please just ignore > > this report. sorry if any inconvenience. > > > > below full report FYI. > > > > > > Hello, > > > > kernel test robot noticed "WARNING:at_arch/x86/mm/fault.c:#do_user_addr_fault" on: > > > > commit: 364ac25d46eea504eb90229d2a1f92e18c1a1eae ("tracing: Guard __DECLARE_TRACE() use of __DO_TRACE_CALL() with SRCU-fast") > > https://git.kernel.org/cgit/linux/kernel/git/paulmck/linux-rcu.git dev.2025.08.13a > > > > in testcase: boot > > > > config: i386-randconfig-004-20250819 > > compiler: clang-20 > > test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G > > > > (please refer to attached dmesg/kmsg for entire log/backtrace) > > Thank you for your testing efforts, and apologies for being slow! > > Could you please try the diagnostic patch at the end of this email? > > Thanx, Paul by applying the patch, the issue gone. but since you said this is a 'diagnostic patch', not sure if it's a real fix. anyway: Tested-by: kernel test robot [...] > > 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 > > | Closes: https://lore.kernel.org/oe-lkp/202508211038.c93e8603-lkp@intel.com [...] > > The kernel config and materials to reproduce are available at: > > https://download.01.org/0day-ci/archive/20250821/202508211038.c93e8603-lkp@intel.com > > -- > > 0-DAY CI Kernel Test Service > > https://github.com/intel/lkp-tests/wiki > > > commit 2d6142ce44dca77fb173bb96850634b169277214 > Author: Paul E. McKenney > Date: Thu Aug 28 12:56:42 2025 -0700 > > EXP tracing: Diagnostic for __DECLARE_TRACE() use of SRCU-fast > > This patch is intended to test the theory that preemption needs to be > disabled in some portion of the tracing infrastructure extending from > the __DECLARE_TRACE() macro to the target BPF program. > > Signed-off-by: Paul E. McKenney > > diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h > index a22c1ab88560b8..c422e4c5ed51ed 100644 > --- a/include/linux/tracepoint.h > +++ b/include/linux/tracepoint.h > @@ -273,7 +273,7 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p) > static inline void __do_trace_##name(proto) \ > { \ > if (cond) { \ > - guard(srcu_fast_notrace)(&tracepoint_srcu); \ > + guard(preempt_notrace)(); \ > __DO_TRACE_CALL(name, TP_ARGS(args)); \ > } \ > } \