Bug 696575

Created attachment 492033 [details]
bonnie debug info

Description of problem:
run bonnie test in guest and run dd on host to make host space 100% used, then delete file on host to release space. bonnie test failed with disk full error although there is space in guest and host.

Version-Release number of selected component (if applicable):
qemu-kvm-0.12.1.2-2.156.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1. cmd
/usr/libexec/qemu-kvm -monitor stdio -drive file='/root/rhel6-64-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=idf6hhrW,mac=9a:9c:ec:0b:30:39,id=ndev00idf6hhrW,bus=pci.0,addr=0x3 -netdev tap,id=idf6hhrW,vhost=on,script='/home/scripts/qemu-ifup-switch',downscript='no' -m 12G -smp 24,cores=1,threads=1,sockets=24 -cpu Opteron_G3 -vnc :0 -rtc base=utc,clock=host,driftfix=none -M rhel6.1.0 -boot order=cdn,once=c,menu=off   -usbdevice tablet -no-kvm-pit-reinjection -enable-kvm

2. run bonnie test in guest

http://qe-git.englab.nay.redhat.com/?p=autotest/.git;a=blob;f=client/tests/kvm/autotest_control/bonnie.control;h=2717a8040a62e5350d6dc7a16750b41f6eeececc;hb=19c75ea1b3ae41e48a9dd0adbc7d71c21b2704e9


3. run dd on host to make host space 100% used
(guest stop with warning "block I/O error in device 'drive-virtio-disk1': No space left on device (28)")

4. delete file on host to release space

5. input qemu cmd "c" to continue guest
  
Actual results:
test failed with "Writing with putc()...Can't putc() - disk full?"

Expected results:


Additional info:
1. host (504G mem & 48 cpu)
kernel: 2.6.32-130.el6.x86_64

cpuinfo: 

processor	: 47
vendor_id	: AuthenticAMD
cpu family	: 16
model		: 9
model name	: AMD Opteron(tm) Processor 6172
stepping	: 1
cpu MHz		: 2100.131
cache size	: 512 KB
physical id	: 1
siblings	: 12
core id		: 5
cpu cores	: 12
apicid		: 27
initial apicid	: 27
fpu		: yes
fpu_exception	: yes
cpuid level	: 5
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nonstop_tsc extd_apicid amd_dcm pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt nodeid_msr npt lbrv svm_lock nrip_save
bogomips	: 4200.06
TLB size	: 1024 4K pages
clflush size	: 64
cache_alignment	: 64
address sizes	: 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate

2. guest
rhel6-64

3. disk info

1). host: 
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/vg_amd61725122-lv_root
                      51606140  38952812  10031888  80% /
tmpfs                264714932         0 264714932   0% /dev/shm
/dev/sda1               495844     31572    438672   7% /boot
/dev/mapper/vg_amd61725122-lv_home
                      21307260  10615960   9608932  53% /home

2). guest:
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/VolGroup-lv_root
                      10067112   2189004   7366724  23% /
tmpfs                  6163712         0   6163712   0% /dev/shm
/dev/vda1               495844     52168    418076  12% /boot


4. bonnie debug info (attached)