Hi Dirk, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-4.4.y head: 10d9c6f92756c1b9049e409cd5e7faed40f95294 commit: ce513359d8507123e63f34b56e67ad558074be22 [9934/9999] scripts/dtc: Remove redundant YYLOC global declaration config: x86_64-randconfig-c003-20200414 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project f3da6b7ab5698bb0b9bd208972115dbcbbc59f27) reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout ce513359d8507123e63f34b56e67ad558074be22 # save the attached .config to linux build tree COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from drivers/scsi/dmx3191d.c:52: for (tmp = (struct scsi_cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (struct scsi_cmnd *) tmp->host_scribble); ^ drivers/scsi/NCR5380.c:951:124: note: put the semicolon on a separate line to silence this warning 1 warning generated. -- if (sas_device->connector_name) ~~ ~~~~~~~~~~~~^~~~~~~~~~~~~~ drivers/scsi/mpt3sas/mpt3sas_scsih.c:3128:19: warning: address of array 'sas_device->connector_name' will always evaluate to 'true' [-Wpointer-bool-conversion] if (sas_device->connector_name) ~~ ~~~~~~~~~~~~^~~~~~~~~~~~~~ 2 warnings generated. -- if (tdinfo->skb_dma) { ~~ ~~~~~~~~^~~~~~~ 1 warning generated. -- static struct perf_amd_iommu __perf_iommu; ^ arch/x86/kernel/cpu/perf_event_amd_iommu.c:36:15: note: forward declaration of 'struct perf_amd_iommu' static struct perf_amd_iommu __perf_iommu; ^ 1 warning generated. vim +951 drivers/scsi/NCR5380.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 929 ^1da177e4c3f41 Linus Torvalds 2005-04-16 930 /* ^1da177e4c3f41 Linus Torvalds 2005-04-16 931 * We use the host_scribble field as a pointer to the next command ^1da177e4c3f41 Linus Torvalds 2005-04-16 932 * in a queue ^1da177e4c3f41 Linus Torvalds 2005-04-16 933 */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 934 ^1da177e4c3f41 Linus Torvalds 2005-04-16 935 cmd->host_scribble = NULL; ^1da177e4c3f41 Linus Torvalds 2005-04-16 936 cmd->scsi_done = done; ^1da177e4c3f41 Linus Torvalds 2005-04-16 937 cmd->result = 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 938 ^1da177e4c3f41 Linus Torvalds 2005-04-16 939 /* ^1da177e4c3f41 Linus Torvalds 2005-04-16 940 * Insert the cmd into the issue queue. Note that REQUEST SENSE ^1da177e4c3f41 Linus Torvalds 2005-04-16 941 * commands are added to the head of the queue since any command will ^1da177e4c3f41 Linus Torvalds 2005-04-16 942 * clear the contingent allegiance condition that exists and the ^1da177e4c3f41 Linus Torvalds 2005-04-16 943 * sense data is only guaranteed to be valid while the condition exists. ^1da177e4c3f41 Linus Torvalds 2005-04-16 944 */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 945 ^1da177e4c3f41 Linus Torvalds 2005-04-16 946 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 947 LIST(cmd, hostdata->issue_queue); ^1da177e4c3f41 Linus Torvalds 2005-04-16 948 cmd->host_scribble = (unsigned char *) hostdata->issue_queue; ^1da177e4c3f41 Linus Torvalds 2005-04-16 949 hostdata->issue_queue = cmd; ^1da177e4c3f41 Linus Torvalds 2005-04-16 950 } else { 710ddd0d50d22b Finn Thain 2014-11-12 @951 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (struct scsi_cmnd *) tmp->host_scribble); ^1da177e4c3f41 Linus Torvalds 2005-04-16 952 LIST(cmd, tmp); ^1da177e4c3f41 Linus Torvalds 2005-04-16 953 tmp->host_scribble = (unsigned char *) cmd; ^1da177e4c3f41 Linus Torvalds 2005-04-16 954 } 52a6a1cbd9615d Finn Thain 2014-03-18 955 dprintk(NDEBUG_QUEUES, "scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); ^1da177e4c3f41 Linus Torvalds 2005-04-16 956 ^1da177e4c3f41 Linus Torvalds 2005-04-16 957 /* Run the coroutine if it isn't already running. */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 958 /* Kick off command processing */ c4028958b6ecad David Howells 2006-11-22 959 schedule_delayed_work(&hostdata->coroutine, 0); ^1da177e4c3f41 Linus Torvalds 2005-04-16 960 return 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 961 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 962 :::::: The code at line 951 was first introduced by commit :::::: 710ddd0d50d22b40e3b644ea35966489ad178978 ncr5380: Drop legacy scsi.h include :::::: TO: Finn Thain <fthain(a)telegraphics.com.au&gt; :::::: CC: Christoph Hellwig <hch(a)lst.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org