tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/urgent head: 0602ec6c74e25dcb8a43961b00eef168fafb8e5e commit: 2726fde5f3900552fcae2d2ac07a05ffba11a491 [6/7] irq_work: Cleanup config: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 3d8149c2a1228609fd7d7c91a04681304a2f0ca9) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout 2726fde5f3900552fcae2d2ac07a05ffba11a491 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): if (irq_work_busy(&work->irq_work)) { ~~~~~~~~~~~~~^ 1 error generated. vim +296 kernel/bpf/stackmap.c 284 285 static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs, 286 u64 *ips, u32 trace_nr, bool user) 287 { 288 int i; 289 struct vm_area_struct *vma; 290 bool irq_work_busy = false; 291 struct stack_map_irq_work *work = NULL; 292 293 if (irqs_disabled()) { 294 if (!IS_ENABLED(CONFIG_PREEMPT_RT)) { 295 work = this_cpu_ptr(&up_read_work); 297 /* cannot queue more up_read, fallback */ 298 irq_work_busy = true; 299 } 300 } else { 301 /* 302 * PREEMPT_RT does not allow to trylock mmap sem in 303 * interrupt disabled context. Force the fallback code. 304 */ 305 irq_work_busy = true; 306 } 307 } 308 309 /* 310 * We cannot do up_read() when the irq is disabled, because of 311 * risk to deadlock with rq_lock. To do build_id lookup when the 312 * irqs are disabled, we need to run up_read() in irq_work. We use 313 * a percpu variable to do the irq_work. If the irq_work is 314 * already used by another lookup, we fall back to report ips. 315 * 316 * Same fallback is used for kernel stack (!user) on a stackmap 317 * with build_id. 318 */ 319 if (!user || !current || !current->mm || irq_work_busy || 320 down_read_trylock(&current->mm->mmap_sem) == 0) { 321 /* cannot access current->mm, fall back to ips */ 322 for (i = 0; i < trace_nr; i++) { 323 id_offs[i].status = BPF_STACK_BUILD_ID_IP; 324 id_offs[i].ip = ips[i]; 325 memset(id_offs[i].build_id, 0, BPF_BUILD_ID_SIZE); 326 } 327 return; 328 } 329 330 for (i = 0; i < trace_nr; i++) { 331 vma = find_vma(current->mm, ips[i]); 332 if (!vma || stack_map_get_build_id(vma, id_offs[i].build_id)) { 333 /* per entry fall back to ips */ 334 id_offs[i].status = BPF_STACK_BUILD_ID_IP; 335 id_offs[i].ip = ips[i]; 336 memset(id_offs[i].build_id, 0, BPF_BUILD_ID_SIZE); 337 continue; 338 } 339 id_offs[i].offset = (vma->vm_pgoff << PAGE_SHIFT) + ips[i] 340 - vma->vm_start; 341 id_offs[i].status = BPF_STACK_BUILD_ID_VALID; 342 } 343 344 if (!work) { 345 up_read(&current->mm->mmap_sem); 346 } else { 347 work->sem = &current->mm->mmap_sem; 348 irq_work_queue(&work->irq_work); 349 /* 350 * The irq_work will release the mmap_sem with 351 * up_read_non_owner(). The rwsem_release() is called 352 * here to release the lock from lockdep's perspective. 353 */ 354 rwsem_release(&current->mm->mmap_sem.dep_map, _RET_IP_); 355 } 356 } 357 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org