From: kernel test robot <lkp@intel.com>
To: oe-kbuild@lists.linux.dev
Cc: lkp@intel.com, Julia Lawall <julia.lawall@inria.fr>
Subject: kernel/trace/trace.c:6382:27-28: ERROR: invalid reference to the index variable of the iterator on line 6308
Date: Tue, 31 Mar 2026 09:52:47 +0800 [thread overview]
Message-ID: <202603310916.clDNuApf-lkp@intel.com> (raw)
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
TO: Steven Rostedt <rostedt@goodmis.org>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: d0c3bcd5b8976159d835a897254048e078f447e6
commit: 428add559b6923f13acc591913cda3467be98dfd tracing: Have tracer option be instance specific
date: 5 months ago
:::::: branch date: 5 hours ago
:::::: commit date: 5 months ago
config: um-randconfig-r061-20260331 (https://download.01.org/0day-ci/archive/20260331/202603310916.clDNuApf-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
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 <lkp@intel.com>
| Reported-by: Julia Lawall <julia.lawall@inria.fr>
| Closes: https://lore.kernel.org/r/202603310916.clDNuApf-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
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