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Description of problem: echo large mem to /proc/sys/vm/nr_hugepage, and then run guest. Version-Release number of selected component (if applicable): qemu-kvm-0.12.1.2-2.188.el6.x86_64 How reproducible: 100% Steps to Reproduce: 1. echo large mem to /proc/sys/vm/nr_hugepage 2. run guest usr/libexec/qemu-kvm -monitor stdio -drive file='/home/Auto/autotest-devel/client/tests/kvm/images/RHEL-Server-6.1-64-virtio.qcow2',index=0,if=none,id=drive-virtio-disk1,media=disk,cache=none,format=qcow2,aio=native -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk1,id=virtio-disk1 -device virtio-net-pci,netdev=idCnizDC,mac=00:e6:4a:94:f2:20,id=ndev00idCnizDC,bus=pci.0,addr=0x3 -netdev tap,id=idCnizDC,vhost=on,script='/home/Auto/autotest-devel/client/tests/kvm/scripts/qemu-ifup-switch',downscript='no' -m 4G -smp 2,cores=2,threads=1,sockets=1 -cpu cpu64-rhel6,+sse2,+x2apic -vnc :2 -rtc base=utc,clock=host,driftfix=none -M rhel6.2.0 -boot order=cdn,once=c,menu=off -usbdevice tablet -no-kvm-pit-reinjection -enable-kvm 3. Actual results: guest crash Expected results: quest quit with mem lack warning Additional info: gdb) #0 0x00000033f4432945 in raise () from /lib64/libc.so.6 #1 0x00000033f4434125 in abort () from /lib64/libc.so.6 #2 0x0000000000482b50 in qemu_memalign (alignment=2097152, size=8589934592) at osdep.c:112 #3 0x00000000004e9a32 in qemu_ram_alloc_from_ptr (dev=<value optimized out>, name=<value optimized out>, size=8589934592, host=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/exec.c:2730 #4 0x0000000000451253 in pc_init1 (ram_size=3758096384, boot_device=0x7fff883a1b80 "d", kernel_filename=0x7fff883a45e1 "/home/Auto/autotest-devel/client/tests/kvm/images/rhel61-64/vmlinuz", kernel_cmdline=0x7fff883a4703 "ks=cdrom nicdelay=60 console=ttyS0,115200 console=tty0", initrd_filename=0x7fff883a462d "/home/Auto/autotest-devel/client/tests/kvm/images/rhel61-64/initrd.img", cpu_model=0x7fff883a45bf "cpu64-rhel6,+sse2,+x2apic", pci_enabled=1) at /usr/src/debug/qemu-kvm-0.12.1.2/hw/pc.c:1114 #5 0x000000000040d1ff in main (argc=<value optimized out>, argv=<value optimized out>, envp=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:6081
This is works as designed. If we're using static huge pages we expect to get enough of them. If you do not have enough (reserved before), just use THP instead.
Hi Dor, I think it should quit but not crash
(In reply to comment #3) > Hi Dor, > I think it should quit but not crash You're right but we barely have the bandwidth to change it, raising an exception is not that awkward solution