From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 08EBD392C46 for ; Wed, 26 Aug 2026 06:11:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.17 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787724713; cv=none; b=Lc8Gyf81UoLrLKbKlorqEy5Rz4A7+kpwQGXVsSJ/JX8wyugaVipcuUkM3ggfafzKSZSpA8bKhIjVRXf8EBYXTmY0QKFtVhkzdhACSdIQ3WMg+65pqAjlnKWvx35Bkn8Y4kGUsKWuhl1tXg3Fk5UqdGZlQ9mgu2qjY57qRoWaNo0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787724713; c=relaxed/simple; bh=emUtRVfgcKuG6DfLkqKcdABC6V+ywcL1xYrm6LP3v6M=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=Pfd4vqTn9QbMRzxyONQtC0Uccfrf1NYbCiKMYseSw/xkaY1yffeEmxawnLbHmmufk8G70ANug3lgADfdGfzI4fih9qqlvnn4UdUmHpclquTF+ikvzXRw2JHVo8+e0hCala8L6YVb6jyQU6S4QrWJX5Ktw6sqd/XfjAxVTO4Qhr0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=hpzf3e37; arc=none smtp.client-ip=192.198.163.17 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="hpzf3e37" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1787724711; x=1819260711; h=date:from:to:cc:subject:message-id:mime-version; bh=emUtRVfgcKuG6DfLkqKcdABC6V+ywcL1xYrm6LP3v6M=; b=hpzf3e374MQR7aHh+5rj4OrEl7N11juIKNCxTuVSxA4AsTmrQFZO3L6I f7Yyh8Z65KRI/rKRfGAOVMt4kI9INRNFuGLDkadt5+10TB2zHPxYZ6Y/O vhxi6ewhlLtVgdgvdA+DdQnKC4R3aKohWX1k8j47BTP0cxZlfPQP7a/pd Vhf2bg9Pp4MCzf7GBKyyztg+VyK90DPsjOYlgJz+jhroUPJyDyOvpN6bR RjB9bEiH9/fi6kmBZakbRuwPtp0AR6vgQo47zXFdbeG+GkhDFMDSY5Cv3 +AJw+dbq0c+DM4x3RA8ZbegBflGevR0rVD8V8Bm1+bwNkOeVPZlBObPGU w==; X-CSE-ConnectionGUID: FmGVTWNuReiSLLWh30UfqQ== X-CSE-MsgGUID: 6KDXP5pZQeWoVQCH5m25mw== X-IronPort-AV: E=McAfee;i="6800,10657,11886"; a="88077233" X-IronPort-AV: E=Sophos;i="6.25,244,1779174000"; d="scan'208";a="88077233" Received: from orviesa005.jf.intel.com ([10.64.159.145]) by fmvoesa111.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Aug 2026 23:11:50 -0700 X-CSE-ConnectionGUID: 34bQO/UIT62kATgRi3tiLA== X-CSE-MsgGUID: h6ZPoQG1S4uluTx9QYm0qQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,244,1779174000"; d="scan'208";a="271692824" Received: from ly-workstation.sh.intel.com (HELO ly-workstation) ([10.239.182.64]) by orviesa005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Aug 2026 23:11:48 -0700 Date: Wed, 26 Aug 2026 14:11:45 +0800 From: kernel test robot To: Jim Cromie , =?utf-8?Q?=C5=81ukasz?= Bartosik Cc: oe-lkp@lists.linux.dev, lkp@intel.com, yi1.lai@intel.com Subject: [jimc:dd-cached-prefix] [lib/dynamic_debug.c] 6a0ecd05d6: WARNING:suspicious_RCU_usage Message-ID: <202608261347.906ae389-lkp@intel.com> Precedence: bulk X-Mailing-List: oe-lkp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hello, kernel test robot noticed "WARNING:suspicious_RCU_usage" on: commit: 6a0ecd05d62aace49cf2087f480e772f0644a8d5 ("lib/dynamic_debug.c: Compress site-data and reclaim trees via shrinker") https://github.com/jimc/linux.git dd-cached-prefix in testcase: trinity version: with following parameters: runtime: 300s group: group-00 nr_groups: 5 config: x86_64-randconfig-016-20260822 compiler: gcc-14 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G (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 | Closes: https://lore.kernel.org/oe-lkp/202608261347.906ae389-lkp@intel.com [ 162.632128][ T37] ============================= [ 162.634749][ T37] WARNING: suspicious RCU usage [ 162.637528][ T37] 7.2.0-00075-g6a0ecd05d62a #1 Tainted: G T [ 162.641711][ T37] ----------------------------- [ 162.644477][ T37] lib/maple_tree.c:764 suspicious rcu_dereference_protected() usage! [ 162.648937][ T37] [ 162.648937][ T37] other info that might help us debug this: [ 162.648937][ T37] [ 162.648937][ T37] other info that might help us debug this: [ 162.648937][ T37] [ 162.648937][ T37] other info that might help us debug this: [ 162.648937][ T37] [ 162.654522][ T37] [ 162.654522][ T37] rcu_scheduler_active = 2, debug_locks = 1 [ 162.654522][ T37] [ 162.654522][ T37] rcu_scheduler_active = 2, debug_locks = 1 [ 162.654522][ T37] [ 162.654522][ T37] rcu_scheduler_active = 2, debug_locks = 1 [ 162.658907][ T37] 2 locks held by kswapd0/37: [ 162.661566][ T37] #0: ffffffff864d7380 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x619/0x1240 [ 162.666732][ T37] #1: ffffffff867fe838 (ddebug_lock){+.+.}-{4:4}, at: ddebug_shrinker_scan+0x20/0x180 [ 162.671967][ T37] [ 162.671967][ T37] stack backtrace: [ 162.671967][ T37] [ 162.671967][ T37] stack backtrace: [ 162.671967][ T37] [ 162.671967][ T37] stack backtrace: [ 162.675394][ T37] CPU: 0 UID: 0 PID: 37 Comm: kswapd0 Tainted: G T 7.2.0-00075-g6a0ecd05d62a #1 PREEMPTLAZY [ 162.681670][ T37] Tainted: [T]=RANDSTRUCT [ 162.684117][ T37] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 162.689603][ T37] Call Trace: [ 162.697070][ T37] [ 162.698843][ T37] dump_stack_lvl+0x3e/0x80 [ 162.701411][ T37] dump_stack+0x14/0x19 [ 162.703712][ T37] lockdep_rcu_suspicious.cold+0x40/0x67 [ 162.706616][ T37] __mt_destroy+0x285/0x300 [ 162.710407][ T37] ddebug_shrinker_scan+0x3c/0x180 [ 162.713321][ T37] do_shrink_slab+0x321/0xa40 [ 162.716035][ T37] shrink_slab+0x243/0x3c0 [ 162.718455][ T37] ? do_shrink_slab+0xa40/0xa40 [ 162.721031][ T37] ? trace_hardirqs_on+0x27/0x180 [ 162.724925][ T37] shrink_node+0x184/0xd00 [ 162.729423][ T37] balance_pgdat+0x596/0x1240 [ 162.732091][ T37] ? schedule+0x27f/0x340 [ 162.734646][ T37] ? shrink_node+0xd00/0xd00 [ 162.737613][ T37] kswapd+0x306/0x5c0 [ 162.739854][ T37] ? balance_pgdat+0x1240/0x1240 [ 162.742519][ T37] ? kasan_metadata_fetch_row+0x40/0x40 [ 162.745421][ T37] ? __kthread_parkme+0xcb/0x240 [ 162.748004][ T37] kthread+0x3c0/0x500 [ 162.750177][ T37] ? calculate_sigpending+0x8f/0x100 [ 162.752982][ T37] ? balance_pgdat+0x1240/0x1240 [ 162.755533][ T37] ? kthread_affine_node+0x280/0x280 [ 162.758321][ T37] ret_from_fork+0x4f7/0x900 [ 162.760690][ T37] ? arch_exit_to_user_mode_prepare+0x240/0x240 [ 162.764190][ T37] ? __kasan_check_read+0x15/0x40 [ 162.771174][ T37] ? __switch_to+0x25/0xd00 [ 162.773586][ T37] ? kthread_affine_node+0x280/0x280 [ 162.776356][ T37] ret_from_fork_asm+0x11/0x20 [ 162.779035][ T37] [ 162.894140][ T37] [ 162.895682][ T37] ============================= [ 162.899769][ T37] WARNING: suspicious RCU usage [ 162.902609][ T37] 7.2.0-00075-g6a0ecd05d62a #1 Tainted: G T [ 162.906891][ T37] ----------------------------- [ 162.909745][ T37] lib/maple_tree.c:721 suspicious rcu_dereference_protected() usage! [ 162.914224][ T37] [ 162.914224][ T37] other info that might help us debug this: [ 162.914224][ T37] [ 162.914224][ T37] other info that might help us debug this: [ 162.914224][ T37] [ 162.914224][ T37] other info that might help us debug this: [ 162.914224][ T37] [ 162.919937][ T37] [ 162.919937][ T37] rcu_scheduler_active = 2, debug_locks = 1 [ 162.919937][ T37] [ 162.919937][ T37] rcu_scheduler_active = 2, debug_locks = 1 [ 162.919937][ T37] [ 162.919937][ T37] rcu_scheduler_active = 2, debug_locks = 1 [ 162.924506][ T37] 2 locks held by kswapd0/37: [ 162.927274][ T37] #0: ffffffff864d7380 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x619/0x1240 [ 162.932577][ T37] #1: ffffffff867fe838 (ddebug_lock){+.+.}-{4:4}, at: ddebug_shrinker_scan+0x20/0x180 [ 162.937489][ T37] [ 162.937489][ T37] stack backtrace: [ 162.937489][ T37] [ 162.937489][ T37] stack backtrace: [ 162.937489][ T37] [ 162.937489][ T37] stack backtrace: [ 162.940765][ T37] CPU: 0 UID: 0 PID: 37 Comm: kswapd0 Tainted: G T 7.2.0-00075-g6a0ecd05d62a #1 PREEMPTLAZY [ 162.947965][ T37] Tainted: [T]=RANDSTRUCT [ 162.950387][ T37] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 162.955983][ T37] Call Trace: [ 162.957918][ T37] [ 162.959649][ T37] dump_stack_lvl+0x3e/0x80 [ 162.962056][ T37] dump_stack+0x14/0x19 [ 162.964223][ T37] lockdep_rcu_suspicious.cold+0x40/0x67 [ 162.967149][ T37] mte_destroy_descend+0x23e/0x500 [ 162.970056][ T37] mt_destroy_walk+0x293/0x1140 [ 162.972780][ T37] ? nbcon_cpu_emergency_exit+0x127/0x180 [ 162.975739][ T37] ? mas_state_walk+0x580/0x580 [ 162.978358][ T37] __mt_destroy+0x234/0x300 [ 162.980750][ T37] ddebug_shrinker_scan+0x3c/0x180 [ 162.983583][ T37] do_shrink_slab+0x321/0xa40 [ 162.986293][ T37] shrink_slab+0x243/0x3c0 [ 162.988741][ T37] ? do_shrink_slab+0xa40/0xa40 [ 162.991403][ T37] ? trace_hardirqs_on+0x27/0x180 [ 162.994248][ T37] shrink_node+0x184/0xd00 [ 162.996831][ T37] balance_pgdat+0x596/0x1240 [ 162.999431][ T37] ? schedule+0x27f/0x340 [ 163.001968][ T37] ? shrink_node+0xd00/0xd00 [ 163.004610][ T37] kswapd+0x306/0x5c0 [ 163.006906][ T37] ? balance_pgdat+0x1240/0x1240 [ 163.009673][ T37] ? kasan_metadata_fetch_row+0x40/0x40 [ 163.012694][ T37] ? __kthread_parkme+0xcb/0x240 [ 163.015526][ T37] kthread+0x3c0/0x500 [ 163.017914][ T37] ? calculate_sigpending+0x8f/0x100 [ 163.020864][ T37] ? balance_pgdat+0x1240/0x1240 [ 163.023570][ T37] ? kthread_affine_node+0x280/0x280 [ 163.026666][ T37] ret_from_fork+0x4f7/0x900 [ 163.029310][ T37] ? arch_exit_to_user_mode_prepare+0x240/0x240 [ 163.033052][ T37] ? __kasan_check_read+0x15/0x40 [ 163.035692][ T37] ? __switch_to+0x25/0xd00 [ 163.038196][ T37] ? kthread_affine_node+0x280/0x280 [ 163.040945][ T37] ret_from_fork_asm+0x11/0x20 [ 163.043482][ T37] The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260826/202608261347.906ae389-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki