tree: https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git kprobes/kretprobe-stackfix head: 6e2b8966c87adc1be0fb4a386fb24ae438f4cb79 commit: 663b1b4caed9e4b0ad1be80b30851e68fb9a40eb [8/10] kprobes: Setup instruction pointer in __kretprobe_trampoline_handler config: parisc-randconfig-r006-20210316 (attached as .config) compiler: hppa-linux-gcc (GCC) 9.3.0 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 # https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git/commit... git remote add mhiramat https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git git fetch --no-tags mhiramat kprobes/kretprobe-stackfix git checkout 663b1b4caed9e4b0ad1be80b30851e68fb9a40eb # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc 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/kprobes.c:1847:12: warning: no previous prototype for 'kprobe_exceptions_notify' [-Wmissing-prototypes] 1847 | int __weak kprobe_exceptions_notify(struct notifier_block *self, | ^~~~~~~~~~~~~~~~~~~~~~~~ kernel/kprobes.c: In function '__kretprobe_trampoline_handler': 1901 | instruction_pointer_set(regs, correct_ret_addr); | ^~~~~~~~~~~~~~~~ | | | kprobe_opcode_t * {aka unsigned int *} In file included from arch/parisc/include/asm/processor.h:18, from arch/parisc/include/asm/spinlock.h:7, from arch/parisc/include/asm/atomic.h:22, from include/linux/atomic.h:7, from arch/parisc/include/asm/bitops.h:13, from include/linux/bitops.h:32, from include/linux/kernel.h:11, from include/linux/list.h:9, from include/linux/kprobes.h:21, from kernel/kprobes.c:21: arch/parisc/include/asm/ptrace.h:29:21: note: expected 'long unsigned int' but argument is of type 'kprobe_opcode_t *' {aka 'unsigned int *'} 29 | unsigned long val) | ~~~~~~~~~~~~~~^~~ vim +/instruction_pointer_set +1901 kernel/kprobes.c 1846 1848 unsigned long val, void *data) 1849 { 1850 return NOTIFY_DONE; 1851 } 1852 NOKPROBE_SYMBOL(kprobe_exceptions_notify); 1853 1854 static struct notifier_block kprobe_exceptions_nb = { 1855 .notifier_call = kprobe_exceptions_notify, 1856 .priority = 0x7fffffff /* we need to be notified first */ 1857 }; 1858 1859 #ifdef CONFIG_KRETPROBES 1860 1861 /* This assumes the tsk is current or the task which is not running. */ 1862 unsigned long kretprobe_find_ret_addr(struct task_struct *tsk, 1863 struct llist_node **cur) 1864 { 1865 struct kretprobe_instance *ri = NULL; 1866 struct llist_node *node = *cur; 1867 1868 if (!node) 1869 node = tsk->kretprobe_instances.first; 1870 else 1871 node = node->next; 1872 1873 while (node) { 1874 ri = container_of(node, struct kretprobe_instance, llist); 1875 if (ri->ret_addr != kretprobe_trampoline_addr()) { 1876 *cur = node; 1877 return (unsigned long)ri->ret_addr; 1878 } 1879 node = node->next; 1880 } 1881 return 0; 1882 } 1883 NOKPROBE_SYMBOL(kretprobe_find_ret_addr); 1884 1885 unsigned long __kretprobe_trampoline_handler(struct pt_regs *regs, 1886 void *frame_pointer) 1887 { 1888 kprobe_opcode_t *correct_ret_addr = NULL; 1889 struct kretprobe_instance *ri = NULL; 1890 struct llist_node *first, *node = NULL; 1891 struct kretprobe *rp; 1892 1893 /* Find correct address and all nodes for this frame. */ 1894 correct_ret_addr = (void *)kretprobe_find_ret_addr(current, &node); 1895 if (!correct_ret_addr) { 1896 pr_err("Oops! Kretprobe fails to find correct return address.\n"); 1897 BUG_ON(1); 1898 } 1899 1900 /* Set the instruction pointer to the correct address */ 1902 1903 /* Run them. */ 1904 first = current->kretprobe_instances.first; 1905 while (first) { 1906 ri = container_of(first, struct kretprobe_instance, llist); 1907 1908 BUG_ON(ri->fp != frame_pointer); 1909 1910 rp = get_kretprobe(ri); 1911 if (rp && rp->handler) { 1912 struct kprobe *prev = kprobe_running(); 1913 1914 __this_cpu_write(current_kprobe, &rp->kp); 1915 ri->ret_addr = correct_ret_addr; 1916 rp->handler(ri, regs); 1917 __this_cpu_write(current_kprobe, prev); 1918 } 1919 if (first == node) 1920 break; 1921 1922 first = first->next; 1923 } 1924 1925 /* Unlink all nodes for this frame. */ 1926 first = current->kretprobe_instances.first; 1927 current->kretprobe_instances.first = node->next; 1928 node->next = NULL; 1929 1930 /* Recycle them. */ 1931 while (first) { 1932 ri = container_of(first, struct kretprobe_instance, llist); 1933 first = first->next; 1934 1935 recycle_rp_inst(ri); 1936 } 1937 1938 return (unsigned long)correct_ret_addr; 1939 } 1940 NOKPROBE_SYMBOL(__kretprobe_trampoline_handler) 1941 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org