tree: https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.4.y-rt head: 5fbf1e70f11dba64cc05c9d85120a3aa7c67a4a2 commit: c9a71d20bad00e88ed426d5c14665d48443f7314 [28/325] printk: add ring buffer and kthread config: i386-randconfig-m021-20200810 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; smatch warnings: kernel/printk/printk.c:3032 printk_kthread_func() warn: possible memory leak of 'buf' kernel/printk/printk.c:3032 printk_kthread_func() warn: possible memory leak of 'ext_text' kernel/printk/printk.c:3032 printk_kthread_func() warn: possible memory leak of 'text' kernel/printk/printk.c:3061 printk_kthread_func() warn: ignoring unreachable code. vim +/buf +3032 kernel/printk/printk.c 3015 3016 static int printk_kthread_func(void *data) 3017 { 3018 struct prb_iterator iter; 3019 struct printk_log *msg; 3020 size_t ext_len; 3021 char *ext_text; 3022 u64 master_seq; 3023 size_t len; 3024 char *text; 3025 char *buf; 3026 int ret; 3027 3028 ext_text = kmalloc(CONSOLE_EXT_LOG_MAX, GFP_KERNEL); 3029 text = kmalloc(PRINTK_SPRINT_MAX, GFP_KERNEL); 3030 buf = kmalloc(PRINTK_RECORD_MAX, GFP_KERNEL); 3031 if (!ext_text || !text || !buf) 3033 3034 prb_iter_init(&iter, &printk_rb, NULL); 3035 3036 /* the printk kthread never exits */ 3037 for (;;) { 3038 ret = prb_iter_wait_next(&iter, buf, 3039 PRINTK_RECORD_MAX, &master_seq); 3040 if (ret == -ERESTARTSYS) { 3041 continue; 3042 } else if (ret < 0) { 3043 /* iterator invalid, start over */ 3044 prb_iter_init(&iter, &printk_rb, NULL); 3045 continue; 3046 } 3047 3048 msg = (struct printk_log *)buf; 3049 format_text(msg, master_seq, ext_text, &ext_len, text, 3050 &len, printk_time); 3051 3052 console_lock(); 3053 if (len > 0 || ext_len > 0) { 3054 call_console_drivers(ext_text, ext_len, text, len); 3055 boot_delay_msec(msg->level); 3056 printk_delay(); 3057 } 3058 console_unlock(); 3059 } 3060 3062 kfree(text); 3063 kfree(buf); 3064 3065 return 0; 3066 } 3067 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org