1 files changed, 70 insertions, 0 deletions
diff --git a/results/classifier/118/virtual/1349972 b/results/classifier/118/virtual/1349972
new file mode 100644
index 00000000..766cd46f
--- /dev/null
+++ b/results/classifier/118/virtual/1349972
@@ -0,0 +1,70 @@
+virtual: 0.908
+user-level: 0.906
+graphic: 0.896
+performance: 0.862
+files: 0.861
+mistranslation: 0.857
+KVM: 0.836
+semantic: 0.816
+device: 0.812
+architecture: 0.805
+PID: 0.805
+ppc: 0.792
+hypervisor: 0.791
+TCG: 0.776
+debug: 0.770
+vnc: 0.735
+kernel: 0.729
+VMM: 0.728
+permissions: 0.696
+network: 0.692
+socket: 0.682
+risc-v: 0.670
+peripherals: 0.669
+register: 0.645
+i386: 0.640
+arm: 0.638
+boot: 0.601
+assembly: 0.600
+x86: 0.488
+
+ qcow2-refcount: qemu-io crashes on 'discard' command
+
+qemu-io is killed by SIGIOT at the 'discard' command on the image having no refcount information.
+
+Sequence:
+1. Unpack test.img and backing_img.qed in the same directory (see the attached archives for images)
+2. Make a copy of test.img to copy.img (qemu-io modifies the image before being kill, therefore the image backup is necessary)
+3. Run the command
+
+qemu-io copy.img -c 'discard 2210816 2856448'
+
+Result: qemu-io is killed by SIGIOT with the reason:
+
+qemu-io: block/qcow2-refcount.c:468: update_refcount_discard: Assertion `d->bytes + length == new_end - new_start' failed.
+
+
+The image was generated by the image fuzzer.
+
+qemu.git HEAD: 1d80eb7a680d
+
+
+
+FWIW:
+
+While trying to restore (apply) a snapshot on a Windows VM (ie: qemu-img snapshot -a snapshotname windows.qcow2 where the image file is 150gb in size,) I got the above error:
+
+qemu-img: /build/buildd/qemu-2.0.0+dfsg/block/qcow2-refcount.c:467: update_refcount_discard: Assertion `d->bytes + length == new_end - new_start' failed.
+
+(My VM is now broken.) 
+
+This is the only reference that I found using Google.
+
+HTH
+
+I sent a patch that fixes the original problem that Maria reported. It's hard to say whether this is the same problem as you saw, Sam, but it's quite possible.
+
+Fix has been included here:
+http://git.qemu.org/?p=qemu.git;a=commitdiff;h=ecbda7a22576591a84
+... so I think it should be OK now to mark this ticket as fixed.
+