FYI, we noticed the following commit (built with gcc-7): commit: b54bfac0e4b30beee5f086ef8b81ab49ae5fe138 ("xfs: Use filemap_huge_fault") git://git.infradead.org/users/willy/linux-dax.git xarray-pagecache in testcase: ltp with following parameters: disk: 1HDD fs: xfs test: ltp-aiodio.part2 test-description: The LTP testsuite contains a collection of tools for testing the Linux kernel and related features. test-url: http://linux-test-project.github.io/ on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +----------------------------------------------------+------------+------------+ | | a47853185d | b54bfac0e4 | +----------------------------------------------------+------------+------------+ | boot_successes | 0 | 3 | | boot_failures | 4 | 23 | | WARNING:at_fs/iomap/buffered-io.c:#iomap_readpages | 4 | 18 | | RIP:iomap_readpages | 4 | 18 | | BUG:unable_to_handle_page_fault_for_address:ff | 0 | 1 | | BUG:soft_lockup-CPU##stuck_for#s | 0 | 7 | | RIP:__find_get_page | 0 | 3 | | RIP:xas_load | 0 | 6 | | Kernel_panic-not_syncing:softlockup:hung_tasks | 0 | 7 | | BUG:kernel_NULL_pointer_dereference,address | 0 | 4 | | Oops:#[##] | 0 | 4 | | RIP:iomap_page_mkwrite | 0 | 4 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 4 | +----------------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot <rong.a.chen(a)intel.com&gt; [ 40.131732] INFO: creating /lkp/benchmarks/ltp/output directory [ 40.131734] [ 40.139428] INFO: creating /lkp/benchmarks/ltp/results directory [ 40.139430] [ 40.153998] Checking for required user/group ids [ 40.154000] [ 40.157482] [ 40.171285] 'nobody' user id and group found. [ 40.171288] [ 40.175406] 'bin' user id and group found. [ 40.175408] [ 40.180443] 'daemon' user id and group found. [ 40.180445] [ 40.184363] Users group found. [ 40.184365] [ 40.187619] Sys group found. [ 40.187621] [ 40.200650] Required users/groups exist. [ 40.200652] [ 40.207315] If some fields are empty or look unusual you may have an old version. [ 40.207317] [ 40.213146] Compare to the current minimal requirements in Documentation/Changes. [ 40.213149] [ 40.217098] [ 40.220644] /etc/os-release [ 40.220646] [ 40.225051] PRETTY_NAME="Debian GNU/Linux 9 (stretch)" [ 40.225053] [ 40.229427] NAME="Debian GNU/Linux" [ 40.229429] [ 40.232418] VERSION_ID="9" [ 40.232420] [ 40.235723] VERSION="9 (stretch)" [ 40.235726] [ 40.239565] ID=debian [ 40.239568] [ 40.242920] HOME_URL="https://www.debian.org/" [ 40.242922] [ 40.246937] SUPPORT_URL="https://www.debian.org/support" [ 40.246939] [ 40.252011] BUG_REPORT_URL="https://bugs.debian.org/" [ 40.252013] [ 40.257258] [ 40.258940] uname: [ 40.258942] [ 40.263910] Linux vm-snb-8G-1beec5b16908 5.3.0-11851-gb54bfac0e4b30 #1 SMP Wed Sep 25 20:46:33 CST 2019 x86_64 GNU/Linux [ 40.263912] [ 40.268364] [ 40.270266] /proc/cmdline [ 40.270268] [ 41.493061] loop: module loaded [ 41.514099] LTP: starting ADSP000 (aiodio_sparse) [ 41.520670] BUG: kernel NULL pointer dereference, address: 0000000000000008 [ 41.522062] #PF: supervisor read access in kernel mode [ 41.523203] #PF: error_code(0x0000) - not-present page [ 41.524237] PGD 0 P4D 0 [ 41.524935] Oops: 0000 [#1] SMP PTI [ 41.525753] CPU: 0 PID: 2408 Comm: aiodio_sparse Not tainted 5.3.0-11851-gb54bfac0e4b30 #1 [ 41.527273] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 [ 41.528740] RIP: 0010:iomap_page_mkwrite+0x40/0x1a0 [ 41.529761] Code: 02 00 00 48 83 ec 08 48 8b 07 48 8b 5f 48 48 c7 c7 70 44 10 a5 48 8b 80 a0 00 00 00 4c 8b 60 20 e8 65 b4 d8 ff e8 d0 36 74 00 <48> 8b 53 08 48 8d 42 ff 83 e2 01 48 0f 44 c3 f0 48 0f ba 28 00 0f [ 41.533401] RSP: 0000:ffffb1af0047bd58 EFLAGS: 00010246 [ 41.534606] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 41.535976] RDX: 0000000000000000 RSI: 000000000000020e RDI: ffffffffa5104470 [ 41.537365] RBP: ffff8ca897311150 R08: ffff8ca89743c320 R09: 0000000000000000 [ 41.538945] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8ca897311150 [ 41.540543] R13: ffffffffc04f4130 R14: 0000000000000001 R15: ffffb1af0047bdf0 [ 41.541983] FS: 00007f3911f52700(0000) GS:ffff8ca93fc00000(0000) knlGS:0000000000000000 [ 41.543633] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.544898] CR2: 0000000000000008 CR3: 000000019a160000 CR4: 00000000000406f0 [ 41.546347] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.547869] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.549327] Call Trace: [ 41.550748] ? down_read+0x21/0xb0 [ 41.551757] __xfs_filemap_fault+0x157/0x220 [xfs] [ 41.552872] ? mmap_region+0x23f/0x660 [ 41.553852] __handle_mm_fault+0x443/0xf60 [ 41.555004] handle_mm_fault+0xdd/0x220 [ 41.556003] __do_page_fault+0x2f1/0x520 [ 41.557012] ? ksys_mmap_pgoff+0x1c1/0x220 [ 41.558045] do_page_fault+0x30/0x120 [ 41.559111] async_page_fault+0x3e/0x50 [ 41.560118] RIP: 0033:0x7f39116003a8 [ 41.561090] Code: c3 48 81 fa 00 08 00 00 77 a8 48 83 fa 40 77 16 f3 0f 7f 07 f3 0f 7f 47 10 f3 0f 7f 44 17 f0 f3 0f 7f 44 17 e0 c3 48 8d 4f 40 <f3> 0f 7f 07 48 83 e1 c0 f3 0f 7f 44 17 f0 f3 0f 7f 47 10 f3 0f 7f [ 41.564877] RSP: 002b:00007ffd118c92b8 EFLAGS: 00010206 [ 41.566162] RAX: 00007f390b000000 RBX: 0000000006400000 RCX: 00007f390b000040 [ 41.567774] RDX: 0000000006400000 RSI: 00000000000000aa RDI: 00007f390b000000 [ 41.569273] RBP: 0000000006400000 R08: 0000000000000007 R09: 0000000000000000 [ 41.570835] R10: 000000000000034e R11: 00007f3911600300 R12: 0000000000000007 [ 41.572306] R13: 00007f390b000000 R14: 0000000000000001 R15: 00007ffd118ca280 [ 41.573746] Modules linked in: loop xfs libcrc32c dm_mod intel_rapl_msr sr_mod intel_rapl_common cdrom sg crct10dif_pclmul ata_generic pata_acpi crc32_pclmul crc32c_intel ghash_clmulni_intel ppdev bochs_drm drm_vram_helper ttm snd_pcm aesni_intel drm_kms_helper crypto_simd ata_piix snd_timer syscopyarea sysfillrect cryptd glue_helper sysimgblt fb_sys_fops snd libata drm soundcore pcspkr joydev serio_raw i2c_piix4 parport_pc floppy parport ip_tables [ 41.581237] CR2: 0000000000000008 [ 41.582299] ---[ end trace 46a11312ec67d652 ]--- To reproduce: # build kernel cd linux cp config-5.3.0-11851-gb54bfac0e4b30 .config make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 INSTALL_MOD_PATH=<mod-install-dir> modules_install cd <mod-install-dir> find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email Thanks, Rong Chen