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Bug #3521

closed

windows 2008 kvm guest crashes with "floating point exception" when using rbd image with cache=writeback

Added by Corin Langosch over 11 years ago. Updated over 11 years ago.

Status:
Resolved
Priority:
Urgent
Assignee:
-
Category:
-
Target version:
-
% Done:

0%

Source:
Community (user)
Tags:
Backport:
Regression:
Severity:
Reviewed:
Affected Versions:
ceph-qa-suite:
Pull request ID:
Crash signature (v1):
Crash signature (v2):

Description

Host: ubuntu 12.10 amd64
Guest: windows 2008 r2
Ceph: 0.48.argonaut2 (the one from the ubuntu repos)

The crash is 100% reproducable on my test system using the following commands:

  1. kvm crashes with "floating point exception"
    kvm -cpu kvm64 -smp sockets=1,cores=4 -m 2048 -vnc 192.168.0.250:2 -usbdevice tablet -nodefaults -boot menu=on -vga cirrus -device ich9-ahci,id=ahci -drive id=drive-286,if=none,cache=writeback,aio=native,format=raw,media=disk,file=rbd:hdd/9686a9e6-a495-4ec2-9418-ab2fe87f11cd -device ide-hd,id=drive-device-286,bus=ahci.0,drive=drive-286
  1. export image to normal file
    rbd export rbd:hdd/9686a9e6-a495-4ec2-9418-ab2fe87f11cd /xfs-drive1/windows1.hdd
  1. works fine (file instead of rbd image)
    kvm -cpu kvm64 -smp sockets=1,cores=4 -m 2048 -vnc 192.168.0.250:2 -usbdevice tablet -nodefaults -boot menu=on -vga cirrus -device ich9-ahci,id=ahci -drive id=drive-286,if=none,cache=writeback,aio=native,format=raw,media=disk,file=/xfs-drive1/windows1.hdd -device ide-hd,id=drive-device-286,bus=ahci.0,drive=drive-286
  1. works fine (using rbd with cache=none)
    kvm -cpu kvm64 -smp sockets=1,cores=4 -m 2048 -vnc 192.168.0.250:2 -usbdevice tablet -nodefaults -boot menu=on -vga cirrus -device ich9-ahci,id=ahci -drive id=drive-286,if=none,cache=none,aio=native,format=raw,media=disk,file=rbd:hdd/9686a9e6-a495-4ec2-9418-ab2fe87f11cd -device ide-hd,id=drive-device-286,bus=ahci.0,drive=drive-286

The gdb backtrace shows (full output at http://pastie.org/5422842):

Program received signal SIGFPE, Arithmetic exception.
[Switching to Thread 0x7fffd97fa700 (LWP 6998)]
0x00007ffff74a6e2e in librbd::AioCompletion::complete() () from /usr/lib/librbd.so.1
(gdb) backtrace
#0 0x00007ffff74a6e2e in librbd::AioCompletion::complete() () from /usr/lib/librbd.so.1
#1 0x00007ffff74a6f4a in librbd::AioCompletion::finish_adding_completions() () from /usr/lib/librbd.so.1
#2 0x00007ffff749f561 in librbd::aio_read(librbd::ImageCtx*, unsigned long, unsigned long, char*, librbd::AioCompletion*) () from /usr/lib/librbd.so.1
...

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