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Cause: invalid assertion in the video streaming code
Consequence: when the assert triggers,the hypervisor would exit with 'qemu sometimes crashes in spice-server with "rate_control->num_recent_enc_frames" assertion' in the log
Fix: fix the invalid assertion
Result: no more crashes
Description of problem:
Sometimes, qemu process crashes with failed assertion: "rate_control->num_recent_enc_frames". The issue was also reported upstream in this ML thread:
http://lists.freedesktop.org/archives/spice-devel/2014-February/thread.html#16030
Version-Release number of selected component (if applicable):
spice-server-0.12.4-6.el6_5.1.x86_64
guest:
* in my case: RHEL 6.5
* upstream report: Windows 7 when working in Outlook
How reproducible:
random
Steps to Reproduce:
1. use of guest over wan could make bug more likely to occur
2.
3.
Actual results:
qemu crashes
Expected results:
no crash occurs
Additional info:
Created attachment 896501[details]
partial log with increased debugging output
I captured this log from a run where I reproduced this assert. I ran qemu by hand, and the assert happened soon after logging into the desktop (rhel6 host / rhel6 guest)
commandline:
QEMU_AUDIO_DRV=spice SPICE_DEBUG_LEVEL=5 qemu-kvm -spice port=5990,disable-ticketing -drive file=/var/lib/libvirt/images/Ambystoma.img,format=raw -m 1024 -vga qxl -device virtio-serial -chardev spicevmc,id=vdagent,debug=0,name=vdagent -device virtserialport,chardev=vdagent,name=com.redhat.spice.0 -device intel-hda,id=sound0
This line looks slightly suspicious:
(/usr/bin/qemu-kvm:3165): Spice-Debug **: mjpeg_encoder.c:937:mjpeg_encoder_decrease_bit_rate: during warmup. ignoring
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
http://rhn.redhat.com/errata/RHBA-2014-1435.html