Hi Chaitanya, First bad commit (maybe != root cause): tree: https://github.com/sbates130272/linux-p2pmem.git nvmet_passthru_v16 head: ec432fdcdaec41c45bfedbf499b69b1bca113b6e commit: ec432fdcdaec41c45bfedbf499b69b1bca113b6e [9/9] nvmet-passthru: Introduce NVMet passthru Kconfig option config: i386-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-14) 9.3.0 reproduce (this is a W=1 build): git checkout ec432fdcdaec41c45bfedbf499b69b1bca113b6e # save the attached .config to linux build tree make W=1 ARCH=i386 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 >>): drivers/nvme/target/passthru.c: In function 'nvmet_passthru_map_sg': 186 | int op_flags = 0; | ^~~~~~~~ vim +/op_flags +186 drivers/nvme/target/passthru.c a3f193a3958f88 Logan Gunthorpe 2019-05-07 181 a3f193a3958f88 Logan Gunthorpe 2019-05-07 182 static int nvmet_passthru_map_sg(struct nvmet_req *req, struct request *rq) a3f193a3958f88 Logan Gunthorpe 2019-05-07 183 { a3f193a3958f88 Logan Gunthorpe 2019-05-07 184 int sg_cnt = req->sg_cnt; a3f193a3958f88 Logan Gunthorpe 2019-05-07 185 struct scatterlist *sg; a3f193a3958f88 Logan Gunthorpe 2019-05-07 @186 int op_flags = 0; a3f193a3958f88 Logan Gunthorpe 2019-05-07 187 struct bio *bio; a3f193a3958f88 Logan Gunthorpe 2019-05-07 188 int i, ret; a3f193a3958f88 Logan Gunthorpe 2019-05-07 189 a3f193a3958f88 Logan Gunthorpe 2019-05-07 190 if (req->cmd->common.opcode == nvme_cmd_flush) a3f193a3958f88 Logan Gunthorpe 2019-05-07 191 op_flags = REQ_FUA; a3f193a3958f88 Logan Gunthorpe 2019-05-07 192 else if (nvme_is_write(req->cmd)) a3f193a3958f88 Logan Gunthorpe 2019-05-07 193 op_flags = REQ_SYNC | REQ_IDLE; a3f193a3958f88 Logan Gunthorpe 2019-05-07 194 a3f193a3958f88 Logan Gunthorpe 2019-05-07 195 bio = bio_alloc(GFP_KERNEL, min(sg_cnt, BIO_MAX_PAGES)); a3f193a3958f88 Logan Gunthorpe 2019-05-07 196 bio->bi_end_io = bio_put; a3f193a3958f88 Logan Gunthorpe 2019-05-07 197 a3f193a3958f88 Logan Gunthorpe 2019-05-07 198 for_each_sg(req->sg, sg, req->sg_cnt, i) { a3f193a3958f88 Logan Gunthorpe 2019-05-07 199 if (bio_add_pc_page(rq->q, bio, sg_page(sg), sg->length, a3f193a3958f88 Logan Gunthorpe 2019-05-07 200 sg->offset) < sg->length) { a3f193a3958f88 Logan Gunthorpe 2019-05-07 201 bio_put(bio); a3f193a3958f88 Logan Gunthorpe 2019-05-07 202 return -EINVAL; a3f193a3958f88 Logan Gunthorpe 2019-05-07 203 } a3f193a3958f88 Logan Gunthorpe 2019-05-07 204 sg_cnt--; a3f193a3958f88 Logan Gunthorpe 2019-05-07 205 } a3f193a3958f88 Logan Gunthorpe 2019-05-07 206 a3f193a3958f88 Logan Gunthorpe 2019-05-07 207 ret = blk_rq_append_bio(rq, &bio); a3f193a3958f88 Logan Gunthorpe 2019-05-07 208 if (unlikely(ret)) { a3f193a3958f88 Logan Gunthorpe 2019-05-07 209 bio_put(bio); a3f193a3958f88 Logan Gunthorpe 2019-05-07 210 return ret; a3f193a3958f88 Logan Gunthorpe 2019-05-07 211 } a3f193a3958f88 Logan Gunthorpe 2019-05-07 212 a3f193a3958f88 Logan Gunthorpe 2019-05-07 213 return 0; a3f193a3958f88 Logan Gunthorpe 2019-05-07 214 } a3f193a3958f88 Logan Gunthorpe 2019-05-07 215 :::::: The code at line 186 was first introduced by commit :::::: a3f193a3958f880c716700f5b1e744a78dada1ff nvmet-passthru: Add passthru code to process commands :::::: TO: Logan Gunthorpe <logang(a)deltatee.com&gt; :::::: CC: Logan Gunthorpe <logang(a)deltatee.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org