While committing snapshot qemu crashes with SIGABRT

Information:

OS: Slackware64-Current
Compiled with: gcc version 5.3.0 (GCC)  / glibc 2.23
Compiled using: 

CFLAGS="-O2 -fPIC" \
CXXFLAGS="-O2 -fPIC" \
LDFLAGS="-L/usr/lib64" \
./configure \
  --prefix=/usr \
  --sysconfdir=/etc \
  --localstatedir=/var \
  --libdir=/usr/lib64 \
  --enable-spice \
  --enable-kvm \
  --enable-glusterfs \
  --enable-libiscsi \
  --enable-libusb \
  --target-list=x86_64-softmmu,i386-softmmu \
  --enable-debug

Source: qemu-2.5.1.tar.bz2

Running as:

/usr/bin/qemu-system-x86_64 -name test1,debug-threads=on -S -machine pc-1.1,accel=kvm,usb=off -m 4096 -realtime mlock=off -smp 2,sockets=2,cores=1,threads=1 -uuid 4b30ec13-6609-4a56-8731-d400c38189ef -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-4-test1/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime,clock=vm,driftfix=slew -global kvm-pit.lost_tick_policy=discard -no-shutdown -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/datastore/vm/test1/test1.img,format=qcow2,if=none,id=drive-virtio-disk0 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=2 -drive if=none,id=drive-ide0-1-0,readonly=on -device ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0,bootindex=1 -netdev tap,fd=23,id=hostnet0,vhost=on,vhostfd=25 -device virtio-net pci,netdev=hostnet0,id=net0,mac=52:54:00:66:2e:0f,bus=pci.0,addr=0x3 -vnc 0.0.0.0:0 -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -msg timestamp=on

File system:  zfs v0.6.5.6

While running: 
virsh blockcommit test1 vda --active --pivot --verbose

VM running very heavy IO load

GDB reporting:

#0  0x00007fd80132c3f8 in raise () at /lib64/libc.so.6
#1  0x00007fd80132dffa in abort () at /lib64/libc.so.6
#2  0x00007fd801324c17 in __assert_fail_base () at /lib64/libc.so.6
#3  0x00007fd801324cc2 in  () at /lib64/libc.so.6
#4  0x000055d9918d7572 in bdrv_replace_in_backing_chain (old=0x55d993ed9c10, new=0x55d9931ccc10) at block.c:2096
        __PRETTY_FUNCTION__ = "bdrv_replace_in_backing_chain"
#5  0x000055d991911869 in mirror_exit (job=0x55d993fef830, opaque=0x55d999bbefe0) at block/mirror.c:376
        to_replace = 0x55d993ed9c10
        s = 0x55d993fef830
        data = 0x55d999bbefe0
        replace_aio_context = <optimized out>
        src = 0x55d993ed9c10
#6  0x000055d9918da1dc in block_job_defer_to_main_loop_bh (opaque=0x55d9940ce850) at blockjob.c:481
        data = 0x55d9940ce850
        aio_context = 0x55d9931a2610
#7  0x000055d9918d014b in aio_bh_poll (ctx=ctx@entry=0x55d9931a2610) at async.c:92
        bh = <optimized out>
        bhp = <optimized out>
        next = 0x55d99440f910
        ret = 1
#8  0x000055d9918dc8c0 in aio_dispatch (ctx=0x55d9931a2610) at aio-posix.c:305
        node = <optimized out>
        progress = false
#9  0x000055d9918d000e in aio_ctx_dispatch (source=<optimized out>, callback=<optimized out>, user_data=<optimized out>) at async.c:231
        ctx = <optimized out>
#10 0x00007fd8037cf787 in g_main_context_dispatch () at /usr/lib64/libglib-2.0.so.0
#11 0x000055d9918db03b in main_loop_wait () at main-loop.c:211
        context = 0x55d9931a3200
        pfds = <optimized out>
        ret = 0
        spin_counter = 1
        ret = 0
        timeout = 4294967295
        timeout_ns = <optimized out>
#12 0x000055d9918db03b in main_loop_wait (timeout=<optimized out>) at main-loop.c:256
        ret = 0
        spin_counter = 1
        ret = 0
        timeout = 4294967295
        timeout_ns = <optimized out>
#13 0x000055d9918db03b in main_loop_wait (nonblocking=<optimized out>) at main-loop.c:504
        ret = 0
        timeout = 4294967295
        timeout_ns = <optimized out>
#14 0x000055d991679cc4 in main () at vl.c:1923
        nonblocking = <optimized out>
        last_io = 2
        i = <optimized out>
        snapshot = <optimized out>
        linux_boot = <optimized out>
        initrd_filename = <optimized out>
        kernel_filename = <optimized out>
        kernel_cmdline = <optimized out>
        boot_order = <optimized out>
        boot_once = <optimized out>
        ds = <optimized out>
        cyls = <optimized out>
        heads = <optimized out>
        secs = <optimized out>
        translation = <optimized out>
        hda_opts = <optimized out>
        opts = <optimized out>
        machine_opts = <optimized out>
        icount_opts = <optimized out>
        olist = <optimized out>
        optind = 49
        optarg = 0x7fffc6d27f43 "timestamp=on"
        loadvm = <optimized out>
        machine_class = 0x55d993194d10
        cpu_model = <optimized out>
        vga_model = 0x0
        qtest_chrdev = <optimized out>
        qtest_log = <optimized out>
        pid_file = <optimized out>
        incoming = <optimized out>
        defconfig = <optimized out>
        userconfig = false
        log_mask = <optimized out>
        log_file = <optimized out>
        trace_events = <optimized out>
        trace_file = <optimized out>
        maxram_size = <optimized out>
        ram_slots = <optimized out>
        vmstate_dump_file = <optimized out>
        main_loop_err = 0x0
        err = 0x0
        __func__ = "main"
#15 0x000055d991679cc4 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4699
        i = <optimized out>
        snapshot = <optimized out>
        linux_boot = <optimized out>
        initrd_filename = <optimized out>
        kernel_filename = <optimized out>
        kernel_cmdline = <optimized out>
        boot_order = <optimized out>
        boot_once = <optimized out>
        ds = <optimized out>
        cyls = <optimized out>
        heads = <optimized out>
        secs = <optimized out>
        translation = <optimized out>
        hda_opts = <optimized out>
        opts = <optimized out>
        machine_opts = <optimized out>
        icount_opts = <optimized out>
        olist = <optimized out>
        optind = 49
        optarg = 0x7fffc6d27f43 "timestamp=on"
        loadvm = <optimized out>
        machine_class = 0x55d993194d10
        cpu_model = <optimized out>
        vga_model = 0x0
        qtest_chrdev = <optimized out>
        qtest_log = <optimized out>
        pid_file = <optimized out>
        incoming = <optimized out>
        defconfig = <optimized out>
        userconfig = false
        log_mask = <optimized out>
        log_file = <optimized out>
        trace_events = <optimized out>
        trace_file = <optimized out>
        maxram_size = <optimized out>
        ram_slots = <optimized out>
        vmstate_dump_file = <optimized out>
        main_loop_err = 0x0
        err = 0x0
        __func__ = "main"



I can reproduce this at will, and can provide more information per a dev's request.