FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux for-kirill
commit dcfb0967eb60b0745e94567192546730d05e8a49 ("save")


+------------------------------------------------------------------+------------+------------+
|                                                                  | b66dfec322 | dcfb0967eb |
+------------------------------------------------------------------+------------+------------+
| boot_successes                                                   | 2          | 12         |
| boot_failures                                                    | 20         | 10         |
| Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 20         |            |
| backtrace:do_fork                                                | 20         |            |
| backtrace:kthreadd                                               | 20         |            |
| IP-Config:Auto-configuration_of_network_failed                   | 0          | 10         |
+------------------------------------------------------------------+------------+------------+

Your commit fix a OOM when running BTRFS selftest delalloc tests, but a new error message showed
in log as below.

[    2.347121] BTRFS: selftest: Running find delalloc tests
[    2.410829] BTRFS: selftest: Failed to allocate test page
[    2.414750] stuck in a loop, start 0, end 268435455, nr_pages 7626, ret 0
[    2.429878] ima: No TPM chip found, activating TPM-bypass!

Elapsed time: 10
qemu-system-i386 -enable-kvm -cpu Haswell,+smep,+smap -kernel /kernel/i386-randconfig-nexs0-04162212/f3de79f90b3efb7b4dc9ad0441adef9281f367ac/vmlinuz-4.0.0-next-20150415-00064-gf3de79f -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-vp-quantal-i386-35/rand_boot-1-quantal-core-i386.cgz-i386-randconfig-nexs0-04162212-f3de79f90b3efb7b4dc9ad0441adef9281f367ac-1-20150417-46680-cpfyqc.yaml ARCH=i386 kconfig=i386-randconfig-nexs0-04162212 branch=sashal/for-kirill commit=f3de79f90b3efb7b4dc9ad0441adef9281f367ac BOOT_IMAGE=/kernel/i386-randconfig-nexs0-04162212/f3de79f90b3efb7b4dc9ad0441adef9281f367ac/vmlinuz-4.0.0-next-20150415-00064-gf3de79f RESULT_ROOT=/result/vm-vp-quantal-i386/boot/1/quantal-core-i386.cgz/i386-randconfig-nexs0-04162212/f3de79f90b3efb7b4dc9ad0441adef9281f367ac/0 LKP_SERVER=inn earlyprintk=ttyS0,115200 rd.udev.log-priority=err systemd.log_target=journal systemd.log_level=warning 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-vp-quantal-i386-35::dhcp drbd.minor_count=8'  -initrd /fs/sdc1/initrd-vm-vp-quantal-i386-35 -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-vp-quantal-i386-35 -serial file:/dev/shm/kboot/serial-vm-vp-quantal-i386-35 -daemonize -display none -monitor null 

Thanks,
Ying Huang