FYI, we noticed the below changes on
https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git virtio_dma
commit 46d2219cb027a0ccee90b980b26a1bb46d186a87 ("virtio_ring: Support DMA
APIs")
+----------------------+------------+------------+
| | a2b5cd8102 | 46d2219cb0 |
+----------------------+------------+------------+
| boot_successes | 15 | 0 |
| boot_failures | 0 | 14 |
| BUG:kernel_boot_hang | 0 | 14 |
+----------------------+------------+------------+
[ 1.295643] blk_update_request: I/O error, dev vda, sector 0
[ 1.297189] Buffer I/O error on dev vda, logical block 0, async page read
[ 2.134088] tsc: Refined TSC clocksource calibration: 2693.503 MHz
[ 2.136924] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x26d3451f606,
max_idle_ns: 440795333933 ns
Elapsed time: 340
BUG: kernel boot hang
qemu-system-x86_64 -enable-kvm -cpu SandyBridge -kernel
/pkg/linux/x86_64-rhel/gcc-4.9/46d2219cb027a0ccee90b980b26a1bb46d186a87/vmlinuz-4.3.0-rc7-00002-g46d2219
-append 'root=/dev/ram0 user=lkp
job=/lkp/scheduled/vm-kbuild-yocto-x86_64-40/bisect_boot-1-yocto-minimal-x86_64.cgz-x86_64-rhel-46d2219cb027a0ccee90b980b26a1bb46d186a87-20151028-61392-107kks6-0.yaml
ARCH=x86_64 kconfig=x86_64-rhel branch=linux-devel/devel-hourly-2015102814
commit=46d2219cb027a0ccee90b980b26a1bb46d186a87
BOOT_IMAGE=/pkg/linux/x86_64-rhel/gcc-4.9/46d2219cb027a0ccee90b980b26a1bb46d186a87/vmlinuz-4.3.0-rc7-00002-g46d2219
max_uptime=600
RESULT_ROOT=/result/boot/1/vm-kbuild-yocto-x86_64/yocto-minimal-x86_64.cgz/x86_64-rhel/gcc-4.9/46d2219cb027a0ccee90b980b26a1bb46d186a87/0
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-kbuild-yocto-x86_64-40::dhcp drbd.minor_count=8'
-initrd /fs/sdc1/initrd-vm-kbuild-yocto-x86_64-40 -m 320 -smp 1 -device e1000,netdev=net0
-netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime
-drive file=/fs/sdc1/disk0-vm-kbuild-yocto-x86_64-40,media=disk,if=virtio -pidfile
/dev/shm/kboot/pid-vm-kbuild-yocto-x86_64-40 -serial
file:/dev/shm/kboot/serial-vm-kbuild-yocto-x86_64-40 -daemonize -display none -monitor
null
Thanks,
Ying Huang