FYI, we noticed the following commit (built with gcc-7): commit: 9165b814d2bea8cfeb557505bb206396331e8192 ("[PATCH v2 8/8] ima: Use ima_hash_algo for collision detection in the measurement list") url: https://github.com/0day-ci/linux/commits/Roberto-Sassu/ima-support-stronger-algorithms-for-attestation/20200205-233901 base: https://git.kernel.org/cgit/linux/kernel/git/zohar/linux-integrity.git next-integrity in testcase: boot 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): +---------------------------------------------+------------+------------+ | | 40db98707e | 9165b814d2 | +---------------------------------------------+------------+------------+ | boot_successes | 2 | 0 | | boot_failures | 2 | 28 | | INFO:rcu_sched_self-detected_stall_on_CPU | 1 | | | RIP:__memcpy | 1 | | | BUG:kernel_hang_in_boot_stage | 2 | 1 | | BUG:kernel_NULL_pointer_dereference,address | 0 | 27 | | Oops:#[##] | 0 | 27 | | RIP:__kmalloc_track_caller | 0 | 27 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 27 | +---------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot [ 56.186402] BUG: kernel NULL pointer dereference, address: 0000000000000060 [ 56.187923] #PF: supervisor read access in kernel mode [ 56.189324] #PF: error_code(0x0000) - not-present page [ 56.190523] PGD 0 P4D 0 [ 56.192220] Oops: 0000 [#1] SMP PTI [ 56.193127] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.5.0-rc1-00025-g9165b814d2bea #2 [ 56.195007] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 56.201402] RIP: 0010:__kmalloc_track_caller+0x98/0x270 [ 56.202738] Code: 01 00 00 4d 8b 07 65 49 8b 50 08 65 4c 03 05 af 22 37 45 49 8b 28 48 85 ed 0f 84 9d 01 00 00 41 8b 47 20 4d 8b 07 48 8d 4a 01 <48> 8b 5c 05 00 48 89 e8 65 49 0f c7 08 0f 94 c0 84 c0 74 c5 41 8b [ 56.206775] RSP: 0018:ffffab64c0013d68 EFLAGS: 00010206 [ 56.208015] RAX: 0000000000000000 RBX: 0000000000000cc0 RCX: 0000000000000b1a [ 56.209612] RDX: 0000000000000b19 RSI: 0000000000000cc0 RDI: ffff98d687c03a40 [ 56.211207] RBP: 0000000000000060 R08: 0000000000031060 R09: 0000000000000001 [ 56.212754] R10: ffffffffbbd6ad58 R11: 0000000000000000 R12: 0000000000000cc0 [ 56.214368] R13: 000000000000000e R14: ffff98d687c03a40 R15: ffff98d687c03a40 [ 56.215902] FS: 0000000000000000(0000) GS:ffff98d7bfc00000(0000) knlGS:0000000000000000 [ 56.217973] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 56.219420] CR2: 0000000000000060 CR3: 00000001eac0a000 CR4: 00000000000406f0 [ 56.221143] Call Trace: [ 56.234421] ? securityfs_create_symlink+0x2a/0x80 [ 56.237098] ? set_debug_rodata+0x11/0x11 [ 56.238814] kstrdup+0x2d/0x60 [ 56.240402] securityfs_create_symlink+0x2a/0x80 [ 56.242714] ? hash_setup+0xa6/0xa6 [ 56.243886] ima_fs_init+0x45/0x1b9 [ 56.246533] ima_init+0x5f/0x72 [ 56.247490] init_ima+0x1d/0xaa [ 56.248488] ? hash_setup+0xa6/0xa6 [ 56.251412] do_one_initcall+0x46/0x214 [ 56.253215] kernel_init_freeable+0x1c2/0x26d [ 56.256230] ? rest_init+0xd0/0xd0 [ 56.257343] kernel_init+0xa/0x110 [ 56.259701] ret_from_fork+0x35/0x40 [ 56.261256] Modules linked in: [ 56.262277] CR2: 0000000000000060 [ 56.263340] ---[ end trace e6c4ee5526b448c4 ]--- To reproduce: # build kernel cd linux cp config-5.5.0-rc1-00025-g9165b814d2bea .config make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k job-script # job-script is attached in this email Thanks, Rong Chen