tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-5.4 head: d2c5af89e80c5b71f1da59879464a930947306a2 commit: f0c8e16e7a2545ec4684e7186e2d450400f7b5a2 [109/132] proc: don't allow async path resolution of /proc/thread-self components config: x86_64-randconfig-r032-20210318 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 436c6c9c20cc522c92a923440a5fc509c342a7db) 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 # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable queue-5.4 git checkout f0c8e16e7a2545ec4684e7186e2d450400f7b5a2 # 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 >>): if (current->flags & PF_IO_WORKER) ^ 1 error generated. -- if (current->flags & PF_IO_WORKER) ^ 1 error generated. vim +/PF_IO_WORKER +23 fs/proc/self.c 7 8 /* 9 * /proc/self: 10 */ 11 static const char *proc_self_get_link(struct dentry *dentry, 12 struct inode *inode, 13 struct delayed_call *done) 14 { 15 struct pid_namespace *ns = proc_pid_ns(inode); 16 pid_t tgid = task_tgid_nr_ns(current, ns); 17 char *name; 18 19 /* 20 * Not currently supported. Once we can inherit all of struct pid, 21 * we can allow this. 22 */ 24 return ERR_PTR(-EOPNOTSUPP); 25 26 if (!tgid) 27 return ERR_PTR(-ENOENT); 28 /* max length of unsigned int in decimal + NULL term */ 29 name = kmalloc(10 + 1, dentry ? GFP_KERNEL : GFP_ATOMIC); 30 if (unlikely(!name)) 31 return dentry ? ERR_PTR(-ENOMEM) : ERR_PTR(-ECHILD); 32 sprintf(name, "%u", tgid); 33 set_delayed_call(done, kfree_link, name); 34 return name; 35 } 36 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org