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X-CSE-ConnectionGUID: 7PWYtRhrQIiHekQTszHmug== X-CSE-MsgGUID: ygJQNC3SSjOiIXvpayiVpg== X-IronPort-AV: E=McAfee;i="6800,10657,11916"; a="91212593" X-IronPort-AV: E=Sophos;i="6.27,124,1787036400"; d="scan'208";a="91212593" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by fmvoesa108.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Sep 2026 05:16:32 -0700 X-CSE-ConnectionGUID: gN8ofT4BQYCEIdXcf9S8pQ== X-CSE-MsgGUID: D/zYmdlSQlS2/OvVGiSVYQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,124,1787036400"; d="scan'208";a="279294654" Received: from igk-lkp-server01.igk.intel.com (HELO 7278393c7b39) ([10.211.93.152]) by fmviesa004.fm.intel.com with ESMTP; 26 Sep 2026 05:16:30 -0700 Received: from kbuild by 7278393c7b39 with local (Exim 4.98.2) (envelope-from ) id 1xARKO-000000000Wf-21uQ; Sat, 26 Sep 2026 12:16:28 +0000 Date: Sat, 26 Sep 2026 14:16:07 +0200 From: kernel test robot To: oe-kbuild@lists.linux.dev Cc: lkp@intel.com, Julia Lawall Subject: kernel/trace/trace.c:6382:27-28: ERROR: invalid reference to the index variable of the iterator on line 6308 Message-ID: <202609261421.yEVKmBFE-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev CC: linux-kernel@vger.kernel.org TO: Steven Rostedt tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 6812ce4e4379ffc99c52401ec28f0d7ffbc36206 commit: 428add559b6923f13acc591913cda3467be98dfd tracing: Have tracer option be instance specific date: 11 months ago :::::: branch date: 13 hours ago :::::: commit date: 11 months ago config: mips-randconfig-r2106-20260924 (https://download.01.org/0day-ci/archive/20260926/202609261421.yEVKmBFE-lkp@intel.com/config) compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 8ec2ba57f65624b4fdcca0fe2b0ff9bfcfe4c4cd) 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 | Fixes: 428add559b69 ("tracing: Have tracer option be instance specific") | Reported-by: kernel test robot | Reported-by: Julia Lawall | Closes: https://lore.kernel.org/r/202609261421.yEVKmBFE-lkp@intel.com/ cocci warnings: (new ones prefixed by >>) >> kernel/trace/trace.c:6382:27-28: ERROR: invalid reference to the index variable of the iterator on line 6308 kernel/trace/trace.c:6382:40-41: ERROR: invalid reference to the index variable of the iterator on line 6308 vim +6382 kernel/trace/trace.c ef9188bcc6ca1d Mark-PK Tsai 2022-04-26 6286 9c5b9d3d65e485 Masami Hiramatsu 2020-01-11 6287 int tracing_set_tracer(struct trace_array *tr, const char *buf) 09d23a1d8a82e8 Steven Rostedt (Red Hat 2015-02-03 6288) { 428add559b6923 Steven Rostedt 2025-11-11 6289 struct tracer *trace = NULL; 428add559b6923 Steven Rostedt 2025-11-11 6290 struct tracers *t; 12883efb670c28 Steven Rostedt (Red Hat 2013-03-05 6291) #ifdef CONFIG_TRACER_MAX_TRACE 34600f0e9c33c9 Steven Rostedt 2013-01-22 6292 bool had_max_tr; 12883efb670c28 Steven Rostedt (Red Hat 2013-03-05 6293) #endif d33b10c0c73adc Steven Rostedt 2024-12-24 6294 int ret; bc0c38d139ec7f Steven Rostedt 2008-05-12 6295 d33b10c0c73adc Steven Rostedt 2024-12-24 6296 guard(mutex)(&trace_types_lock); 1027fcb206a0fb Steven Rostedt 2009-03-12 6297 7a1d1e4b9639ff Steven Rostedt (Google 2024-06-12 6298) update_last_data(tr); 7a1d1e4b9639ff Steven Rostedt (Google 2024-06-12 6299) a1f157c7a3bb34 Zheng Yejian 2023-09-06 6300 if (!tr->ring_buffer_expanded) { 2b6080f28c7cc3 Steven Rostedt 2012-05-11 6301 ret = __tracing_resize_ring_buffer(tr, trace_buf_size, 438ced1720b584 Vaibhav Nagarnaik 2012-02-02 6302 RING_BUFFER_ALL_CPUS); 73c5162aa362a5 Steven Rostedt 2009-03-11 6303 if (ret < 0) d33b10c0c73adc Steven Rostedt 2024-12-24 6304 return ret; 73c5162aa362a5 Steven Rostedt 2009-03-11 6305 ret = 0; 73c5162aa362a5 Steven Rostedt 2009-03-11 6306 } 73c5162aa362a5 Steven Rostedt 2009-03-11 6307 428add559b6923 Steven Rostedt 2025-11-11 @6308 list_for_each_entry(t, &tr->tracers, list) { 428add559b6923 Steven Rostedt 2025-11-11 6309 if (strcmp(t->tracer->name, buf) == 0) { 428add559b6923 Steven Rostedt 2025-11-11 6310 trace = t->tracer; bc0c38d139ec7f Steven Rostedt 2008-05-12 6311 break; bc0c38d139ec7f Steven Rostedt 2008-05-12 6312 } 428add559b6923 Steven Rostedt 2025-11-11 6313 } 428add559b6923 Steven Rostedt 2025-11-11 6314 if (!trace) d33b10c0c73adc Steven Rostedt 2024-12-24 6315 return -EINVAL; d33b10c0c73adc Steven Rostedt 2024-12-24 6316 428add559b6923 Steven Rostedt 2025-11-11 6317 if (trace == tr->current_trace) d33b10c0c73adc Steven Rostedt 2024-12-24 6318 return 0; bc0c38d139ec7f Steven Rostedt 2008-05-12 6319 a35873a0993b4d Tom Zanussi 2019-02-13 6320 #ifdef CONFIG_TRACER_SNAPSHOT 428add559b6923 Steven Rostedt 2025-11-11 6321 if (trace->use_max_tr) { c0a581d7126c0b Waiman Long 2022-09-22 6322 local_irq_disable(); a35873a0993b4d Tom Zanussi 2019-02-13 6323 arch_spin_lock(&tr->max_lock); 22bec11a569983 Steven Rostedt 2025-01-06 6324 ret = tr->cond_snapshot ? -EBUSY : 0; a35873a0993b4d Tom Zanussi 2019-02-13 6325 arch_spin_unlock(&tr->max_lock); c0a581d7126c0b Waiman Long 2022-09-22 6326 local_irq_enable(); a35873a0993b4d Tom Zanussi 2019-02-13 6327 if (ret) d33b10c0c73adc Steven Rostedt 2024-12-24 6328 return ret; a35873a0993b4d Tom Zanussi 2019-02-13 6329 } a35873a0993b4d Tom Zanussi 2019-02-13 6330 #endif c7b3ae0bd2ca65 Ziqian SUN (Zamir 2017-09-11 6331) /* Some tracers won't work on kernel command line */ 428add559b6923 Steven Rostedt 2025-11-11 6332 if (system_state < SYSTEM_RUNNING && trace->noboot) { c7b3ae0bd2ca65 Ziqian SUN (Zamir 2017-09-11 6333) pr_warn("Tracer '%s' is not allowed on command line, ignored\n", 428add559b6923 Steven Rostedt 2025-11-11 6334 trace->name); d1e27ee9c6f21c Steven Rostedt 2024-12-19 6335 return -EINVAL; c7b3ae0bd2ca65 Ziqian SUN (Zamir 2017-09-11 6336) } c7b3ae0bd2ca65 Ziqian SUN (Zamir 2017-09-11 6337) 607e2ea167e56d Steven Rostedt (Red Hat 2013-11-06 6338) /* Some tracers are only allowed for the top level buffer */ 428add559b6923 Steven Rostedt 2025-11-11 6339 if (!trace_ok_for_array(trace, tr)) d33b10c0c73adc Steven Rostedt 2024-12-24 6340 return -EINVAL; 607e2ea167e56d Steven Rostedt (Red Hat 2013-11-06 6341) cf6ab6d9143b15 Steven Rostedt (Red Hat 2014-12-15 6342) /* If trace pipe files are being read, we can't change the tracer */ d33b10c0c73adc Steven Rostedt 2024-12-24 6343 if (tr->trace_ref) d33b10c0c73adc Steven Rostedt 2024-12-24 6344 return -EBUSY; cf6ab6d9143b15 Steven Rostedt (Red Hat 2014-12-15 6345) 9f029e83e968e5 Steven Rostedt 2008-11-12 6346 trace_branch_disable(); 613f04a0f51e6e Steven Rostedt (Red Hat 2013-03-14 6347) 50512ab576e1ce Steven Rostedt (Red Hat 2014-01-14 6348) tr->current_trace->enabled--; 613f04a0f51e6e Steven Rostedt (Red Hat 2013-03-14 6349) 2b6080f28c7cc3 Steven Rostedt 2012-05-11 6350 if (tr->current_trace->reset) 2b6080f28c7cc3 Steven Rostedt 2012-05-11 6351 tr->current_trace->reset(tr); 613f04a0f51e6e Steven Rostedt (Red Hat 2013-03-14 6352) a541a9559bb0a8 Steven Rostedt (Google 2022-10-05 6353) #ifdef CONFIG_TRACER_MAX_TRACE a541a9559bb0a8 Steven Rostedt (Google 2022-10-05 6354) had_max_tr = tr->current_trace->use_max_tr; a541a9559bb0a8 Steven Rostedt (Google 2022-10-05 6355) 7440172974e85b Paul E. McKenney 2018-11-06 6356 /* Current trace needs to be nop_trace before synchronize_rcu */ 2b6080f28c7cc3 Steven Rostedt 2012-05-11 6357 tr->current_trace = &nop_trace; 428add559b6923 Steven Rostedt 2025-11-11 6358 tr->current_trace_flags = nop_trace.flags; 34600f0e9c33c9 Steven Rostedt 2013-01-22 6359 428add559b6923 Steven Rostedt 2025-11-11 6360 if (had_max_tr && !trace->use_max_tr) { 34600f0e9c33c9 Steven Rostedt 2013-01-22 6361 /* 34600f0e9c33c9 Steven Rostedt 2013-01-22 6362 * We need to make sure that the update_max_tr sees that 34600f0e9c33c9 Steven Rostedt 2013-01-22 6363 * current_trace changed to nop_trace to keep it from 34600f0e9c33c9 Steven Rostedt 2013-01-22 6364 * swapping the buffers after we resize it. 34600f0e9c33c9 Steven Rostedt 2013-01-22 6365 * The update_max_tr is called from interrupts disabled 34600f0e9c33c9 Steven Rostedt 2013-01-22 6366 * so a synchronized_sched() is sufficient. 34600f0e9c33c9 Steven Rostedt 2013-01-22 6367 */ 7440172974e85b Paul E. McKenney 2018-11-06 6368 synchronize_rcu(); 3209cff4490bee Steven Rostedt (Red Hat 2013-03-12 6369) free_snapshot(tr); 180e4e390978af Vincent Donnefort 2024-02-20 6370 tracing_disarm_snapshot(tr); ef710e100c1068 KOSAKI Motohiro 2010-07-01 6371 } 12883efb670c28 Steven Rostedt (Red Hat 2013-03-05 6372) 428add559b6923 Steven Rostedt 2025-11-11 6373 if (!had_max_tr && trace->use_max_tr) { 180e4e390978af Vincent Donnefort 2024-02-20 6374 ret = tracing_arm_snapshot_locked(tr); 180e4e390978af Vincent Donnefort 2024-02-20 6375 if (ret) d33b10c0c73adc Steven Rostedt 2024-12-24 6376 return ret; ef710e100c1068 KOSAKI Motohiro 2010-07-01 6377 } a541a9559bb0a8 Steven Rostedt (Google 2022-10-05 6378) #else a541a9559bb0a8 Steven Rostedt (Google 2022-10-05 6379) tr->current_trace = &nop_trace; 12883efb670c28 Steven Rostedt (Red Hat 2013-03-05 6380) #endif 577b785f55168d Steven Rostedt 2009-02-26 6381 428add559b6923 Steven Rostedt 2025-11-11 @6382 tr->current_trace_flags = t->flags ? : t->tracer->flags; 428add559b6923 Steven Rostedt 2025-11-11 6383 428add559b6923 Steven Rostedt 2025-11-11 6384 if (trace->init) { 428add559b6923 Steven Rostedt 2025-11-11 6385 ret = tracer_init(trace, tr); 180e4e390978af Vincent Donnefort 2024-02-20 6386 if (ret) { 180e4e390978af Vincent Donnefort 2024-02-20 6387 #ifdef CONFIG_TRACER_MAX_TRACE 428add559b6923 Steven Rostedt 2025-11-11 6388 if (trace->use_max_tr) 180e4e390978af Vincent Donnefort 2024-02-20 6389 tracing_disarm_snapshot(tr); 180e4e390978af Vincent Donnefort 2024-02-20 6390 #endif 428add559b6923 Steven Rostedt 2025-11-11 6391 tr->current_trace_flags = nop_trace.flags; d33b10c0c73adc Steven Rostedt 2024-12-24 6392 return ret; 1c80025a49855b Frederic Weisbecker 2008-11-16 6393 } 180e4e390978af Vincent Donnefort 2024-02-20 6394 } bc0c38d139ec7f Steven Rostedt 2008-05-12 6395 428add559b6923 Steven Rostedt 2025-11-11 6396 tr->current_trace = trace; 50512ab576e1ce Steven Rostedt (Red Hat 2014-01-14 6397) tr->current_trace->enabled++; 9f029e83e968e5 Steven Rostedt 2008-11-12 6398 trace_branch_enable(tr); bc0c38d139ec7f Steven Rostedt 2008-05-12 6399 d33b10c0c73adc Steven Rostedt 2024-12-24 6400 return 0; d9e540762f5cdd Peter Zijlstra 2008-11-01 6401 } d9e540762f5cdd Peter Zijlstra 2008-11-01 6402 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki