tree: https://android.googlesource.com/kernel/common android12-5.10 head: 084fab46dd7c1be137dd7f5981bac7d38d1c0fb2 commit: 084fab46dd7c1be137dd7f5981bac7d38d1c0fb2 [2/2] ANDROID: ftrace: vendor hook for ftrace dump on oops config: i386-randconfig-r032-20210114 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): git remote add android-common https://android.googlesource.com/kernel/common git fetch --no-tags android-common android12-5.10 git checkout 084fab46dd7c1be137dd7f5981bac7d38d1c0fb2 # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): kernel/trace/trace.c: In function 'ftrace_dump': 9323 | unsigned long size; | ^~~~ vim +/size +9323 kernel/trace/trace.c 9312 9313 void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) 9314 { 9315 /* use static because iter can be a bit big for the stack */ 9316 static struct trace_iterator iter; 9317 static atomic_t dump_running; 9318 struct trace_array *tr = &global_trace; 9319 unsigned int old_userobj; 9320 unsigned long flags; 9321 int cnt = 0, cpu; 9322 bool ftrace_check = false; 9324 9325 /* Only allow one dump user at a time. */ 9326 if (atomic_inc_return(&dump_running) != 1) { 9327 atomic_dec(&dump_running); 9328 return; 9329 } 9330 9331 /* 9332 * Always turn off tracing when we dump. 9333 * We don't need to show trace output of what happens 9334 * between multiple crashes. 9335 * 9336 * If the user does a sysrq-z, then they can re-enable 9337 * tracing with echo 1 > tracing_on. 9338 */ 9339 tracing_off(); 9340 9341 local_irq_save(flags); 9342 printk_nmi_direct_enter(); 9343 9344 /* Simulate the iterator */ 9345 trace_init_global_iter(&iter); 9346 /* Can not use kmalloc for iter.temp */ 9347 iter.temp = static_temp_buf; 9348 iter.temp_size = STATIC_TEMP_BUF_SIZE; 9349 9350 for_each_tracing_cpu(cpu) { 9351 atomic_inc(&per_cpu_ptr(iter.array_buffer->data, cpu)->disabled); 9352 size = ring_buffer_size(iter.array_buffer->buffer, cpu); 9353 trace_android_vh_ftrace_size_check(size, &ftrace_check); 9354 } 9355 9356 old_userobj = tr->trace_flags & TRACE_ITER_SYM_USEROBJ; 9357 9358 /* don't look at user memory in panic mode */ 9359 tr->trace_flags &= ~TRACE_ITER_SYM_USEROBJ; 9360 9361 if (ftrace_check) 9362 goto out_enable; 9363 9364 switch (oops_dump_mode) { 9365 case DUMP_ALL: 9366 iter.cpu_file = RING_BUFFER_ALL_CPUS; 9367 break; 9368 case DUMP_ORIG: 9369 iter.cpu_file = raw_smp_processor_id(); 9370 break; 9371 case DUMP_NONE: 9372 goto out_enable; 9373 default: 9374 printk(KERN_TRACE "Bad dumping mode, switching to all CPUs dump\n"); 9375 iter.cpu_file = RING_BUFFER_ALL_CPUS; 9376 } 9377 9378 printk(KERN_TRACE "Dumping ftrace buffer:\n"); 9379 9380 /* Did function tracer already get disabled? */ 9381 if (ftrace_is_dead()) { 9382 printk("# WARNING: FUNCTION TRACING IS CORRUPTED\n"); 9383 printk("# MAY BE MISSING FUNCTION EVENTS\n"); 9384 } 9385 9386 /* 9387 * We need to stop all tracing on all CPUS to read 9388 * the next buffer. This is a bit expensive, but is 9389 * not done often. We fill all what we can read, 9390 * and then release the locks again. 9391 */ 9392 9393 while (!trace_empty(&iter)) { 9394 ftrace_check = true; 9395 9396 if (!cnt) 9397 printk(KERN_TRACE "---------------------------------\n"); 9398 9399 cnt++; 9400 9401 trace_iterator_reset(&iter); 9402 trace_android_vh_ftrace_format_check(&ftrace_check); 9403 if (ftrace_check) 9404 iter.iter_flags |= TRACE_FILE_LAT_FMT; 9405 9406 if (trace_find_next_entry_inc(&iter) != NULL) { 9407 int ret; 9408 9409 ret = print_trace_line(&iter); 9410 if (ret != TRACE_TYPE_NO_CONSUME) 9411 trace_consume(&iter); 9412 } 9413 touch_nmi_watchdog(); 9414 9415 trace_printk_seq(&iter.seq); 9416 } 9417 9418 if (!cnt) 9419 printk(KERN_TRACE " (ftrace buffer empty)\n"); 9420 else 9421 printk(KERN_TRACE "---------------------------------\n"); 9422 9423 out_enable: 9424 tr->trace_flags |= old_userobj; 9425 9426 for_each_tracing_cpu(cpu) { 9427 atomic_dec(&per_cpu_ptr(iter.array_buffer->data, cpu)->disabled); 9428 } 9429 atomic_dec(&dump_running); 9430 printk_nmi_direct_exit(); 9431 local_irq_restore(flags); 9432 } 9433 EXPORT_SYMBOL_GPL(ftrace_dump); 9434 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org