FYI, we noticed the below changes on https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git chrdev-warn commit fbf32ec3dc2890faa6a8e6d0e89664f178bb7476 ("chrdev: allocate dynamic chardevs in all unused holes") As below, the log "QAT: unable to allocate chrdev region" showed with your commit. [ 14.223507] watchdog: Software Watchdog: cannot register miscdev on minor=130 (err=-16). [ 14.223507] watchdog: Software Watchdog: cannot register miscdev on minor=130 (err=-16). [ 14.225849] watchdog: Software Watchdog: a legacy watchdog module is probably present. [ 14.225849] watchdog: Software Watchdog: a legacy watchdog module is probably present. [ 14.228320] softdog: Software Watchdog Timer: 0.08 initialized. soft_noboot=0 soft_margin=60 sec soft_panic=0 (nowayout=1) [ 14.228320] softdog: Software Watchdog Timer: 0.08 initialized. soft_noboot=0 soft_margin=60 sec soft_panic=0 (nowayout=1) [ 14.234554] dcdbas dcdbas: Dell Systems Management Base Driver (version 5.6.0-3.2) [ 14.234554] dcdbas dcdbas: Dell Systems Management Base Driver (version 5.6.0-3.2) [ 14.236682] No iBFT detected. [ 14.236682] No iBFT detected. [ 14.237508] QAT: unable to allocate chrdev region [ 14.237508] QAT: unable to allocate chrdev region FYI, raw QEMU command line is: qemu-system-x86_64 -enable-kvm -cpu Nehalem -kernel /pkg/linux/x86_64-randconfig-a0-03231935/gcc-5/fbf32ec3dc2890faa6a8e6d0e89664f178bb7476/vmlinuz-4.5.0-rc2-00207-gfbf32ec -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-intel12-1G-3/bisect_boot-1-debian-x86_64-2015-02-07.cgz-x86_64-randconfig-a0-03231935-fbf32ec3dc2890faa6a8e6d0e89664f178bb7476-20160324-70544-l6nviw-0.yaml ARCH=x86_64 kconfig=x86_64-randconfig-a0-03231935 branch=linux-devel/devel-hourly-2016032317 commit=fbf32ec3dc2890faa6a8e6d0e89664f178bb7476 BOOT_IMAGE=/pkg/linux/x86_64-randconfig-a0-03231935/gcc-5/fbf32ec3dc2890faa6a8e6d0e89664f178bb7476/vmlinuz-4.5.0-rc2-00207-gfbf32ec max_uptime=600 RESULT_ROOT=/result/boot/1/vm-intel12-1G/debian-x86_64-2015-02-07.cgz/x86_64-randconfig-a0-03231935/gcc-5/fbf32ec3dc2890faa6a8e6d0e89664f178bb7476/0 LKP_SERVER=inn earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal rw ip=::::vm-intel12-1G-3::dhcp' -initrd /fs/KVM/initrd-vm-intel12-1G-3 -m 1024 -smp 1 -device e1000,netdev=net0 -netdev user,id=net0,hostfwd=tcp::23302-:22 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -drive file=/fs/KVM/disk0-vm-intel12-1G-3,media=disk,if=virtio -drive file=/fs/KVM/disk1-vm-intel12-1G-3,media=disk,if=virtio -drive file=/fs/KVM/disk2-vm-intel12-1G-3,media=disk,if=virtio -drive file=/fs/KVM/disk3-vm-intel12-1G-3,media=disk,if=virtio -drive file=/fs/KVM/disk4-vm-intel12-1G-3,media=disk,if=virtio -drive file=/fs/KVM/disk5-vm-intel12-1G-3,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-intel12-1G-3 -serial file:/dev/shm/kboot/serial-vm-intel12-1G-3 -daemonize -display none -monitor null Thanks, Xiaolong Ye