FYI, we noticed the following commit: https://git.kernel.org/pub/scm/linux/kernel/git/tytso/random.git dev commit a237e0d70467a748cca16b2e4dbaefa831cd5f22 ("random: replace non-blocking pool with a Chacha20-based CRNG") on test machine: vm-lkp-wsx03-quantal-i386: 1 threads qemu-system-i386 -enable-kvm with 360M memory caused below changes: +-------------------------------------------------------------------------+----------+------------+ | | v4.7-rc1 | a237e0d704 | +-------------------------------------------------------------------------+----------+------------+ | boot_successes | 74 | 4 | | boot_failures | 31 | | | invoked_oom-killer:gfp_mask=0x | 9 | | | Mem-Info | 9 | | | Out_of_memory:Kill_process | 9 | | | page_allocation_failure:order:#,mode:#(GFP_HIGHUSER_MOVABLE) | 8 | | | warn_alloc_failed+0x | 7 | | | backtrace:_do_fork | 9 | | | backtrace:SyS_clone | 9 | | | backtrace:do_writev | 6 | | | backtrace:SyS_writev | 6 | | | page_allocation_failure:order:#,mode:#(GFP_HIGHUSER_MOVABLE|__GFP_ZERO) | 1 | | | BUG:unable_to_handle_kernel | 2 | | | Oops:#[##] | 2 | | | EIP_is_at_perf_prepare_sample | 2 | | | Kernel_panic-not_syncing:Fatal_exception | 2 | | | Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 2 | | | IP-Config:Auto-configuration_of_network_failed | 20 | | +-------------------------------------------------------------------------+----------+------------+ [ 1502.687825] Writes: Total: 2 Max/Min: 0/0 Fail: 0 Elapsed time: 1540 BUG: kernel test hang qemu-system-i386 -enable-kvm -kernel /pkg/linux/i386-randconfig-s1-201622/gcc-6/a237e0d70467a748cca16b2e4dbaefa831cd5f22/vmlinuz-4.7.0-rc1-00001-ga237e0d -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-lkp-wsx03-quantal-i386-7/bisect_boot-1-quantal-core-i386.cgz-i386-randconfig-s1-201622-a237e0d70467a748cca16b2e4dbaefa831cd5f22-20160531-96518-1tb7f3s-0.yaml ARCH=i386 kconfig=i386-randconfig-s1-201622 branch=linux-devel/devel-spot-201605311827 commit=a237e0d70467a748cca16b2e4dbaefa831cd5f22 BOOT_IMAGE=/pkg/linux/i386-randconfig-s1-201622/gcc-6/a237e0d70467a748cca16b2e4dbaefa831cd5f22/vmlinuz-4.7.0-rc1-00001-ga237e0d max_uptime=600 RESULT_ROOT=/result/boot/1/vm-lkp-wsx03-quantal-i386/quantal-core-i386.cgz/i386-randconfig-s1-201622/gcc-6/a237e0d70467a748cca16b2e4dbaefa831cd5f22/0 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-lkp-wsx03-quantal-i386-7::dhcp drbd.minor_count=8' -initrd /fs/sdc1/initrd-vm-lkp-wsx03-quantal-i386-7 -m 360 -smp 1 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -pidfile /dev/shm/kboot/pid-vm-lkp-wsx03-quantal-i386-7 -serial file:/dev/shm/kboot/serial-vm-lkp-wsx03-quantal-i386-7 -daemonize -display none -monitor null FYI, raw QEMU command line is: qemu-system-i386 -enable-kvm -kernel /pkg/linux/i386-randconfig-s1-201622/gcc-6/a237e0d70467a748cca16b2e4dbaefa831cd5f22/vmlinuz-4.7.0-rc1-00001-ga237e0d -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-lkp-wsx03-quantal-i386-7/bisect_boot-1-quantal-core-i386.cgz-i386-randconfig-s1-201622-a237e0d70467a748cca16b2e4dbaefa831cd5f22-20160531-96518-1tb7f3s-0.yaml ARCH=i386 kconfig=i386-randconfig-s1-201622 branch=linux-devel/devel-spot-201605311827 commit=a237e0d70467a748cca16b2e4dbaefa831cd5f22 BOOT_IMAGE=/pkg/linux/i386-randconfig-s1-201622/gcc-6/a237e0d70467a748cca16b2e4dbaefa831cd5f22/vmlinuz-4.7.0-rc1-00001-ga237e0d max_uptime=600 RESULT_ROOT=/result/boot/1/vm-lkp-wsx03-quantal-i386/quantal-core-i386.cgz/i386-randconfig-s1-201622/gcc-6/a237e0d70467a748cca16b2e4dbaefa831cd5f22/0 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-lkp-wsx03-quantal-i386-7::dhcp drbd.minor_count=8' -initrd /fs/sdc1/initrd-vm-lkp-wsx03-quantal-i386-7 -m 360 -smp 1 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -pidfile /dev/shm/kboot/pid-vm-lkp-wsx03-quantal-i386-7 -serial file:/dev/shm/kboot/serial-vm-lkp-wsx03-quantal-i386-7 -daemonize -display none -monitor null Thanks, Kernel Test Robot