** Changed in: qemu-kvm (Ubuntu)
Importance: Undecided => Medium
** Changed in: qemu-kvm (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1314857
Title:
seg fault in ivshmem when using ioeventfd=on
Status in QEMU:
New
Status in “qemu-kvm” package in Ubuntu:
Confirmed
Bug description:
When launching qemu with the ivshmem device and the nahanni guest
server there is segmentation fault in the setup_ioeventfds function of
ivshmem.c. If the ioeventfd=on flag is set the pci_ivshmem_init will
call setup_ioeventfds at line 668. This function relies on the 'peers'
member of the server info which is not allocated until line 669.
To reproduce you will need the nahanni guest server code. The driver
code is not needed. You will also need a qcow2 or other bootable image
to use for launching qemu. The error occurs before the actual image
launch.
Start the nahanni ivshmem server with a small global memory space ( although
the bug is not allocation specific )
ivshmem -m 1 -n 2 -p /tmp/ivshmem_socket
Next launch qemu with initialization for the ivshmem device.
qemu-system-x86_64 -hda test_iso.qcow2 -localtime -boot c -chardev
socket,path="/tmp/ivshmem_socket",id=ivshmem_socket -device
ivshmem,chardev=ivshmem_socket,size=1,ioeventfd=on
If gdb is used the following error is recorded:
Program received signal SIGSEGV, Segmentation fault.
0x000055555579dd52 in setup_ioeventfds (s=0x555556619580)
at /home/genes/work/ubuntu/qemu-kvm-1.0+noroms/hw/ivshmem.c:367
367 for (j = 0; j < s->peers[i].nb_eventfds; j++) {
(gdb) print s->peers
$2 = (Peer *) 0x0
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