Hi Hans, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: e47eb90a0a9ae20b82635b9b99a8d0979b757ad8 commit: be8cebc46d9d38166a1b3fda22a018ae52b0928e [3176/4736] media: cpia2: deprecate this driver config: riscv-randconfig-r026-20220901 (https://download.01.org/0day-ci/archive/20220902/202209020437.eXEOdmfe-lkp@xxxxxxxxx/config) compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project c55b41d5199d2394dd6cdb8f52180d8b81d809d4) 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 riscv cross compiling tool for clang build # apt-get install binutils-riscv-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=be8cebc46d9d38166a1b3fda22a018ae52b0928e git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout be8cebc46d9d38166a1b3fda22a018ae52b0928e # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/staging/media/deprecated/cpia2/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/staging/media/deprecated/cpia2/cpia2_usb.c:80:13: warning: variable 'frame_count' set but not used [-Wunused-but-set-variable] static int frame_count; ^ 1 warning generated. vim +/frame_count +80 drivers/staging/media/deprecated/cpia2/cpia2_usb.c ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 71 ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 72 ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 73 /****************************************************************************** ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 74 * ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 75 * process_frame ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 76 * ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 77 *****************************************************************************/ ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 78 static void process_frame(struct camera_data *cam) ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 79 { ff699e6bd02eb1c drivers/media/video/cpia2/cpia2_usb.c Douglas Schilling Landgraf 2008-04-22 @80 static int frame_count; ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 81 ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 82 unsigned char *inbuff = cam->workbuff->data; ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 83 ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 84 DBG("Processing frame #%d, current:%d\n", ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 85 cam->workbuff->num, cam->curbuff->num); ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 86 ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 87 if(cam->workbuff->length > cam->workbuff->max_length) ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 88 cam->workbuff->max_length = cam->workbuff->length; ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 89 ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 90 if ((inbuff[0] == 0xFF) && (inbuff[1] == 0xD8)) { ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 91 frame_count++; ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 92 } else { ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 93 cam->workbuff->status = FRAME_ERROR; ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 94 DBG("Start of frame not found\n"); ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 95 return; ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 96 } ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 97 ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 98 /*** ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 99 * Now the output buffer should have a JPEG image in it. ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 100 ***/ ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 101 if(!cam->first_image_seen) { ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 102 /* Always skip the first image after streaming ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 103 * starts. It is almost certainly corrupt. */ ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 104 cam->first_image_seen = 1; ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 105 cam->workbuff->status = FRAME_EMPTY; ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 106 return; ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 107 } ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 108 if (cam->workbuff->length > 3) { ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 109 if(cam->mmapped && ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 110 cam->workbuff->length < cam->workbuff->max_length) { ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 111 /* No junk in the buffers */ ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 112 memset(cam->workbuff->data+cam->workbuff->length, ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 113 0, cam->workbuff->max_length- ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 114 cam->workbuff->length); ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 115 } ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 116 cam->workbuff->max_length = cam->workbuff->length; ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 117 cam->workbuff->status = FRAME_READY; ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 118 ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 119 if(!cam->mmapped && cam->num_frames > 2) { ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 120 /* During normal reading, the most recent ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 121 * frame will be read. If the current frame ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 122 * hasn't started reading yet, it will never ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 123 * be read, so mark it empty. If the buffer is ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 124 * mmapped, or we have few buffers, we need to ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 125 * wait for the user to free the buffer. ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 126 * ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 127 * NOTE: This is not entirely foolproof with 3 ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 128 * buffers, but it would take an EXTREMELY ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 129 * overloaded system to cause problems (possible ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 130 * image data corruption). Basically, it would ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 131 * need to take more time to execute cpia2_read ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 132 * than it would for the camera to send ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 133 * cam->num_frames-2 frames before problems ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 134 * could occur. ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 135 */ ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 136 cam->curbuff->status = FRAME_EMPTY; ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 137 } ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 138 cam->curbuff = cam->workbuff; ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 139 cam->workbuff = cam->workbuff->next; ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 140 DBG("Changed buffers, work:%d, current:%d\n", ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 141 cam->workbuff->num, cam->curbuff->num); ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 142 return; ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 143 } else { ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 144 DBG("Not enough data for an image.\n"); ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 145 } ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 146 ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 147 cam->workbuff->status = FRAME_ERROR; ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 148 return; ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 149 } ab33d5071de7a33 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 150 :::::: The code at line 80 was first introduced by commit :::::: ff699e6bd02eb1c6d02c7c2b576c2ee6caab201c V4L/DVB (7094): static memory :::::: TO: Douglas Schilling Landgraf <dougsland@xxxxxxxxx> :::::: CC: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxx> -- 0-DAY CI Kernel Test Service https://01.org/lkp
