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Description of problem:
chardev does not have a default backend ,when start qemu-kvm with -chardev w/o backend ,seg fault will happened.
Version-Release number of selected component (if applicable):
# uname -r
2.6.32-215.el6.x86_64
[root@test ~]# rpm -q qemu-kvm
qemu-kvm-0.12.1.2-2.206.el6.x86_64
How reproducible:
100%
Steps to Reproduce:
1.start guest with -chardev id=charchannnel0 -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=test
Actual results:
segfault happened .
Program received signal SIGSEGV, Segmentation fault.
__strcmp_sse42 () at ../sysdeps/x86_64/multiarch/strcmp.S:515
515 movdqa (%rdi), %xmm2
(gdb) bt
#0 __strcmp_sse42 () at ../sysdeps/x86_64/multiarch/strcmp.S:515
#1 0x00000000004beb38 in qemu_chr_open_opts (opts=0xf01470, init=0)
at qemu-char.c:2640
#2 0x00000000004096ab in chardev_init_func (opts=<value optimized out>,
opaque=<value optimized out>)
at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:4756
#3 0x000000000047bc9a in qemu_opts_foreach (list=<value optimized out>,
func=0x4096a0 <chardev_init_func>, opaque=0x0,
abort_on_failure=<value optimized out>) at qemu-option.c:957
#4 0x000000000040d068 in main (argc=<value optimized out>,
argv=<value optimized out>, envp=<value optimized out>)
at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:6033
Expected results:
chardev should have a default backend if user did not specify one .whatever should no segmentation fault
Additional info:
Reproduced this issue on qemu-kvm-0.12.1.2-2.209.el6 and verified pass on qemu-kvm-0.12.1.2-2.221.el6.x86_64.
Steps:
Boot a guest with chardev but without backend, for example:
-device virtio-serial-pci,id=virtio-serial0,max_ports=16,bus=pci.0,addr=0x7 -chardev id=channel0,host=127.0.0.1,port=12345,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=channel0,id=channel0,name=com.redhat.rhevm.vdsm
On qemu-kvm-0.12.1.2-2.209.el6, got a segment fault:
Program received signal SIGSEGV, Segmentation fault.
(gdb) bt
#0 0x0000003243733a1a in __strcmp_ssse3 () from /lib64/libc.so.6
#1 0x00000000004bec88 in qemu_chr_open_opts (opts=0xf00d20, init=0) at qemu-char.c:2640
#2 0x00000000004096fb in chardev_init_func (opts=<value optimized out>, opaque=<value optimized out>)
at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:4761
#3 0x000000000047bd0a in qemu_opts_foreach (list=<value optimized out>, func=0x4096f0 <chardev_init_func>,
opaque=0x0, abort_on_failure=<value optimized out>) at qemu-option.c:957
#4 0x000000000040d068 in main (argc=<value optimized out>, argv=<value optimized out>,
envp=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:6038
On qemu-kvm-0.12.1.2-2.221.el6.x86_64, qemu gives prompt if there's no backend for a chardev:
chardev: "channel0" missing backend
So, this issue is fixed.
Technical note added. If any revisions are required, please edit the "Technical Notes" field
accordingly. All revisions will be proofread by the Engineering Content Services team.
New Contents:
No documentation needed
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-2012-0746.html
Description of problem: chardev does not have a default backend ,when start qemu-kvm with -chardev w/o backend ,seg fault will happened. Version-Release number of selected component (if applicable): # uname -r 2.6.32-215.el6.x86_64 [root@test ~]# rpm -q qemu-kvm qemu-kvm-0.12.1.2-2.206.el6.x86_64 How reproducible: 100% Steps to Reproduce: 1.start guest with -chardev id=charchannnel0 -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=test Actual results: segfault happened . Program received signal SIGSEGV, Segmentation fault. __strcmp_sse42 () at ../sysdeps/x86_64/multiarch/strcmp.S:515 515 movdqa (%rdi), %xmm2 (gdb) bt #0 __strcmp_sse42 () at ../sysdeps/x86_64/multiarch/strcmp.S:515 #1 0x00000000004beb38 in qemu_chr_open_opts (opts=0xf01470, init=0) at qemu-char.c:2640 #2 0x00000000004096ab in chardev_init_func (opts=<value optimized out>, opaque=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:4756 #3 0x000000000047bc9a in qemu_opts_foreach (list=<value optimized out>, func=0x4096a0 <chardev_init_func>, opaque=0x0, abort_on_failure=<value optimized out>) at qemu-option.c:957 #4 0x000000000040d068 in main (argc=<value optimized out>, argv=<value optimized out>, envp=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:6033 Expected results: chardev should have a default backend if user did not specify one .whatever should no segmentation fault Additional info: