FYI, we noticed the following commit (built with gcc-7): commit: 8c5c906fa51596651e5d11e968797deda86e7fea ("mm/mmap: Use current_syscall_task_size() in get_unmapped_area()") https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git x86/fixes in testcase: rcutorture with following parameters: runtime: 300s test: cpuhotplug torture_type: srcu test-description: rcutorture is rcutorture kernel module load/unload test. test-url: https://www.kernel.org/doc/Documentation/RCU/torture.txt 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): +------------------------------------------------+------------+------------+ | | c0e0591f33 | 8c5c906fa5 | +------------------------------------------------+------------+------------+ | boot_successes | 30 | 0 | | boot_failures | 0 | 28 | | Kernel_panic-not_syncing:No_working_init_found | 0 | 28 | +------------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot <rong.a.chen(a)intel.com&gt; [ 12.143700] Run /etc/init as init process [ 12.145113] Starting init: /etc/init exists but couldn't execute it (error -13) [ 12.147601] Run /bin/init as init process [ 12.149019] Run /bin/sh as init process [ 12.150400] Starting init: /bin/sh exists but couldn't execute it (error -14) [ 12.152630] Kernel panic - not syncing: No working init found. Try passing init= option to kernel. See Linux Documentation/admin-guide/init.rst for guidance. [ 12.157043] CPU: 1 PID: 1 Comm: init Not tainted 5.0.0-rc7-00028-g8c5c906f #1 [ 12.159256] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 [ 12.161958] Call Trace: [ 12.164218] dump_stack+0x5c/0x7b [ 12.165439] ? rest_init+0x80/0xd0 [ 12.166687] panic+0xfe/0x2b2 [ 12.167809] ? rest_init+0xd0/0xd0 [ 12.169057] kernel_init+0xf5/0x110 [ 12.170317] ret_from_fork+0x35/0x40 [ 12.171661] Kernel Offset: 0xd000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) Elapsed time: 20 qemu-img create -f qcow2 disk-vm-snb-8G-403-0 256G To reproduce: # build kernel cd linux cp config-5.0.0-rc7-00028-g8c5c906f .config make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 prepare make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 modules_prepare make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 SHELL=/bin/bash make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 bzImage git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email Thanks, Rong Chen