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Re: [Qemu-discuss] Qemu corrupted qcow2 system image

From: Ivan Volosyuk
Subject: Re: [Qemu-discuss] Qemu corrupted qcow2 system image
Date: Thu, 05 Nov 2015 02:08:40 +0000

If you make a patch or git repo I can try it would be awesome. Ideally, I would like to restore the data from the file. ;-)

On Thu, Nov 5, 2015 at 1:05 PM Ivan Volosyuk <address@hidden> wrote:
The image has some personal data and is pretty large 1T (140G allocated). I recompiled qemu-img and run through gdb:
Program received signal SIGSEGV, Segmentation fault.
get_refcount_ro4 (refcount_array=0x7fffc0edc010, index=246458459629569) at block/qcow2-refcount.c:179
179         return be16_to_cpu(((const uint16_t *)refcount_array)[index]);
(gdb) bt
#0  get_refcount_ro4 (refcount_array=0x7fffc0edc010, index=246458459629569) at block/qcow2-refcount.c:179
#1  0x0000555555595851 in inc_refcounts (address@hidden, address@hidden, 
    address@hidden, address@hidden, res=0x7fffffffd730, res=0x7fffffffd730, bs=0x555555c76320)
    at block/qcow2-refcount.c:1329
#2  0x0000555555595a61 in check_refcounts_l1 (address@hidden, address@hidden, address@hidden, 
    address@hidden, l1_table_offset=-2294842463426117632, l1_size=335544320, address@hidden)
    at block/qcow2-refcount.c:1487
#3  0x0000555555595fcd in calculate_refcounts (address@hidden, address@hidden, address@hidden(unknown: 0), 
    address@hidden, address@hidden, address@hidden)
    at block/qcow2-refcount.c:1811
#4  0x000055555559893e in qcow2_check_refcounts (address@hidden, address@hidden, address@hidden(unknown: 0))
    at block/qcow2-refcount.c:2199
#5  0x0000555555592d15 in qcow2_check (bs=0x555555c76320, result=0x7fffffffd730, fix=(unknown: 0)) at block/qcow2.c:336
#6  0x0000555555568b2b in collect_image_check (bs=0x555555c76320, check=0x555555ca8e40, 
    filename=0x7fffffffdc72 "/home/ivan/../vm-images/win81a.qcow2.broken", fix=<optimized out>, fmt=<optimized out>) at qemu-img.c:444
#7  0x000055555556a53e in img_check (argc=<optimized out>, argv=<optimized out>) at qemu-img.c:570
#8  0x000055555556559c in main (argc=3, argv=0x7fffffffd938) at qemu-img.c:3087

On Thu, Nov 5, 2015 at 12:29 PM Fam Zheng <address@hidden> wrote:
On Thu, 11/05 01:09, Ivan Volosyuk wrote:
> Yesterday, I did a few tweaks for my system which uses VGA passthrough.
> - I moved virtual CPUs to dedicated CPUs (isolcpus=4-7 kernel boot argument)
> - I instructed my windows guest to use MSI IRQ
> Sound crackles disappeared, but after a few minutes of playing Starcraft I
> got first ever reboot of windows 8.1 in virtual machine. When I tried to
> restart the virtual machine I got the message that qcow2 image is corrupted.
> qemu-img check crashes with segfault now on the image.

Is the convinient for you to provide the image? If not, can you post the
backtrace of "qemu-img check" crash?


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