tree: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-5.15/io_uring head: 22ec865ddfba31ddf26b9d2b4a01e8437ca1f727 commit: 6a32aa46fa0b531970581d5b425514da7f9f8e46 [43/45] io_uring: remove files pointer in cancellation functions config: s390-randconfig-r014-20210812 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 767496d19cb9a1fbba57ff08095faa161998ee36) 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 s390 cross compiling tool for clang build # apt-get install binutils-s390x-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/com... git remote add block https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git git fetch --no-tags block for-5.15/io_uring git checkout 6a32aa46fa0b531970581d5b425514da7f9f8e46 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=s390 SHELL=/bin/bash 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 >>): In file included from kernel/exit.c:51: In file included from include/linux/blkdev.h:25: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:75: include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __raw_readb(PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:36:59: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x)) ^ include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16' #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x)) ^ In file included from kernel/exit.c:51: In file included from include/linux/blkdev.h:25: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:75: include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32' #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x)) ^ In file included from kernel/exit.c:51: In file included from include/linux/blkdev.h:25: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:75: include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ io_uring_files_cancel(); ~~~~~~~~~~~~~~~~~~~~~ ^ include/linux/io_uring.h:36:20: note: 'io_uring_files_cancel' declared here static inline void io_uring_files_cancel(struct files_struct *files) ^ 12 warnings and 1 error generated. vim +/files +780 kernel/exit.c 726 727 void __noreturn do_exit(long code) 728 { 729 struct task_struct *tsk = current; 730 int group_dead; 731 732 /* 733 * We can get here from a kernel oops, sometimes with preemption off. 734 * Start by checking for critical errors. 735 * Then fix up important state like USER_DS and preemption. 736 * Then do everything else. 737 */ 738 739 WARN_ON(blk_needs_flush_plug(tsk)); 740 741 if (unlikely(in_interrupt())) 742 panic("Aiee, killing interrupt handler!"); 743 if (unlikely(!tsk->pid)) 744 panic("Attempted to kill the idle task!"); 745 746 /* 747 * If do_exit is called because this processes oopsed, it's possible 748 * that get_fs() was left as KERNEL_DS, so reset it to USER_DS before 749 * continuing. Amongst other possible reasons, this is to prevent 750 * mm_release()->clear_child_tid() from writing to a user-controlled 751 * kernel address. 752 */ 753 force_uaccess_begin(); 754 755 if (unlikely(in_atomic())) { 756 pr_info("note: %s[%d] exited with preempt_count %d\n", 757 current->comm, task_pid_nr(current), 758 preempt_count()); 759 preempt_count_set(PREEMPT_ENABLED); 760 } 761 762 profile_task_exit(tsk); 763 kcov_task_exit(tsk); 764 765 ptrace_event(PTRACE_EVENT_EXIT, code); 766 767 validate_creds_for_do_exit(tsk); 768 769 /* 770 * We're taking recursive faults here in do_exit. Safest is to just 771 * leave this task alone and wait for reboot. 772 */ 773 if (unlikely(tsk->flags & PF_EXITING)) { 774 pr_alert("Fixing recursive fault but reboot is needed!\n"); 775 futex_exit_recursive(tsk); 776 set_current_state(TASK_UNINTERRUPTIBLE); 777 schedule(); 778 } 779 781 exit_signals(tsk); /* sets PF_EXITING */ 782 783 /* sync mm's RSS info before statistics gathering */ 784 if (tsk->mm) 785 sync_mm_rss(tsk->mm); 786 acct_update_integrals(tsk); 787 group_dead = atomic_dec_and_test(&tsk->signal->live); 788 if (group_dead) { 789 /* 790 * If the last thread of global init has exited, panic 791 * immediately to get a useable coredump. 792 */ 793 if (unlikely(is_global_init(tsk))) 794 panic("Attempted to kill init! exitcode=0x%08x\n", 795 tsk->signal->group_exit_code ?: (int)code); 796 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org