Hi, maybe someone has an immediate idea or can reproduce, I'm currently lacking time to debug this: With latest kvm-userspace I'm seeing sporadic qemu crashes when hard-resetting a guest that currently does some I/O (qcow2 disk in snapshot mode). Below is the backtrace, s is null. So far the issue does not show up with -no-kvm or with upstream qemu (also without kvm as upstream's reset in kvm mode is not working yet). Jan --- Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7fd5e75406f0 (LWP 13554)] ide_read_dma_cb (opaque=0xef2e60, ret=0) at /data/kvm-userspace/qemu/hw/ide.c:1010 1010 n = s->io_buffer_size >> 9; (gdb) bt #0 ide_read_dma_cb (opaque=0xef2e60, ret=0) at /data/kvm-userspace/qemu/hw/ide.c:1010 #1 0x000000000041668e in dma_bdrv_cb (opaque=0xdd0250, ret=0) at /data/kvm-userspace/qemu/dma-helpers.c:86 #2 0x000000000046e4a8 in bdrv_aio_rw_vector_cb (opaque=0xdd00b0, ret=0) at block.c:1280 #3 0x00000000004b49fb in qcow_aio_read_cb (opaque=0xc81150, ret=0) at block-qcow2.c:1239 #4 0x00000000004b49fb in qcow_aio_read_cb (opaque=0x10f6010, ret=0) at block-qcow2.c:1239 #5 0x000000000041b4df in posix_aio_read (opaque=<value optimized out>) at block-raw-posix.c:533 #6 0x000000000040969a in main_loop_wait (timeout=<value optimized out>) at /data/kvm-userspace/qemu/vl.c:3814 #7 0x000000000052029a in kvm_main_loop () at /data/kvm-userspace/qemu/qemu-kvm.c:597 #8 0x000000000040e038 in main (argc=<value optimized out>, argv=0x7fffef57b448, envp=<value optimized out>) at /data/kvm-userspace/qemu/vl.c:3871
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