Hi, The content of aiocb (gdb) print *aiocb $1 = {common = {pool = 0x9aced0, bs = 0x1270230, cb = 0x45591f <multiwrite_cb>, opaque = 0x7f54b0034f60, next = 0x0}, aio_fildes = 16, {aio_iov = 0x7f54b006cd48, aio_ioctl_buf = 0x7f54b006cd48}, aio_niov = 17, aio_nbytes = 65024, ev_signo = 12, aio_offset = 1081344, node = {tqe_next = 0x0, tqe_prev = 0x9f10a0}, aio_type = 2, ret = -115, active = 1, next = 0x7f54b00409f0, async_context_id = 0} (gdb) print aiocb->aio_iov[0] $2 = {iov_base = 0x7f54a9f141f8, iov_len = 3592} (gdb) print aiocb->aio_iov[1] $3 = {iov_base = 0x7f54a27d5000, iov_len = 4096} (gdb) print aiocb->aio_iov[2] $4 = {iov_base = 0x7f54a30d6000, iov_len = 4096} (gdb) print aiocb->aio_iov[3] $5 = {iov_base = 0x7f5433a57000, iov_len = 4096} (gdb) print aiocb->aio_iov[5] $6 = {iov_base = 0x7f54a2fd9000, iov_len = 4096} (gdb) print aiocb->aio_iov[6] $7 = {iov_base = 0x7f54a275a000, iov_len = 4096} (gdb) print aiocb->aio_iov[7] $8 = {iov_base = 0x7f54a2fdb000, iov_len = 4096} (gdb) print aiocb->aio_iov[8] $9 = {iov_base = 0x7f54ab55c000, iov_len = 4096} (gdb) print aiocb->aio_iov[9] $10 = {iov_base = 0x7f543639d000, iov_len = 4096} (gdb) print aiocb->aio_iov[10] $11 = {iov_base = 0x7f543115e000, iov_len = 4096} (gdb) print aiocb->aio_iov[11] $12 = {iov_base = 0x7f54361df000, iov_len = 4096} (gdb) print aiocb->aio_iov[12] $13 = {iov_base = 0x7f54a9620000, iov_len = 4096} (gdb) print aiocb->aio_iov[13] $14 = {iov_base = 0x7f54a23a1000, iov_len = 4096} (gdb) print aiocb->aio_iov[14] $15 = {iov_base = 0x7f54ae122000, iov_len = 4096} (gdb) print aiocb->aio_iov[15] $16 = {iov_base = 0x7f54312a3000, iov_len = 4096} (gdb) print aiocb->aio_iov[16] $17 = {iov_base = 0x7f54a28a4000, iov_len = 503} (gdb) The one thing that seems odd is that the sum of iov_len is 65535 which is > then aio_nbtyes of 65024 Does this mean the code ends up writing past the end of buf? /Conor -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html