Re: [Qemu-devel] [PATCH] block/file-posix: add bdrv_attach_aio_context callback for host dev and cdrom

[Stefan Hajnoczi]

On Fri, Jul 20, 2018 at 03:11:14PM -0400, Farhan Ali wrote:
> I am seeing another issue pop up, in a different test. Even though it's a
> different assertion, it might be related based on the call trace.

Which test case?

> Stack trace of thread 276199:
> #0  0x000003ff8473e274 raise (libc.so.6)
> #1  0x000003ff847239a8 abort (libc.so.6)
> #2  0x000003ff847362ce __assert_fail_base (libc.so.6)
> #3  0x000003ff8473634c __assert_fail (libc.so.6)
> #4  0x000002aa30aba0c4 iov_memset (qemu-system-s390x)
> #5  0x000002aa30aba9a6 qemu_iovec_memset (qemu-system-s390x)
> #6  0x000002aa30a23e88 qemu_laio_process_completion (qemu-system-s390x)

What are the values of laiocb->qiov->size and laiocb->ret?

> #7  0x000002aa30a23f68 qemu_laio_process_completions (qemu-system-s390x)
> #8  0x000002aa30a2418e qemu_laio_process_completions_and_submit
> (qemu-system-s390x)
> #9  0x000002aa30a24220 qemu_laio_poll_cb (qemu-system-s390x)
> #10 0x000002aa30ab22c4 run_poll_handlers_once (qemu-system-s390x)
> #11 0x000002aa30ab2e78 aio_poll (qemu-system-s390x)
> #12 0x000002aa30a29f4e bdrv_do_drained_begin (qemu-system-s390x)
> #13 0x000002aa30a2a276 bdrv_drain (qemu-system-s390x)
> #14 0x000002aa309d45aa bdrv_set_aio_context (qemu-system-s390x)
> #15 0x000002aa3085acfe virtio_blk_data_plane_stop (qemu-system-s390x)
> #16 0x000002aa3096994c virtio_bus_stop_ioeventfd.part.1 (qemu-system-s390x)
> #17 0x000002aa3087d1d6 virtio_vmstate_change (qemu-system-s390x)
> #18 0x000002aa308e8a12 vm_state_notify (qemu-system-s390x)
> #19 0x000002aa3080ed54 do_vm_stop (qemu-system-s390x)
> #20 0x000002aa307bea04 main (qemu-system-s390x)
> #21 0x000003ff84723dd2 __libc_start_main (libc.so.6)
> #22 0x000002aa307c0414 _start (qemu-system-s390x)
> 
> 
> The failing assertion is:
> 
> qemu-kvm: util/iov.c:78: iov_memset: Assertion `offset == 0' failed.

I wonder if the offset is beyond the end of the iovecs.

Thanks,
Stefan

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