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Created attachment 1162873 [details]
backtrace

Description of problem:
When connecting to guest VM with client (with Smartcard attached), the qemu-kvm instance crashes

Version-Release number of selected component (if applicable):
guest:
tested on rhel7.3
qemu-kvm-1.5.3-112.el7.x86_64
spice-server-0.12.4-17.el7.x86_64
virt-manager-1.3.2-1.el7.noarch

client:
tested on Win7
remote-viewer version 2.0-129 (OS ID: rhev-win64)


How reproducible: always


Steps to Reproduce:
1. Add Smartcard hardware in Passthrough mode to guest VM in virt-manager (tested on rhel 7.3 and Fedora 23)
2. Start this VM
3. Connect to guest VM with client (with attached and installed Smartcard to it):
 remote-viewer --spice-smartcard spice://$ip_guest:$port_guest

Actual results:
qemu-kvm crashes (SIGABRT)



Expected results:
Remote-viewer session is successfully established. Smartcard is shared between guest and client.


Additional info:
backtrace attached

qemu-kvm-rhev (2.30-31.el7_2.14) is not affected.

the bug applies also for remote-viewer version 2.0-8.el7 (OS ID: rhel7)

easy to reproduce, fixed by spice upstream 

commit 0c1f5b00e7907aefee13f86a234558f00cd6c7ef
Author: Uri Lublin <uril>
Date:   Mon Feb 2 12:35:59 2015 +0200

    char-device: spice_char_device_write_to_device: protect against recursion

bug #1338752 needs this patch as well even though symptoms are very different.

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.

https://rhn.redhat.com/errata/RHBA-2016-2324.html