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Re: [Qemu-devel] [PULL 2/5] migration: move bdrv_invalidate_cache_all of

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PULL 2/5] migration: move bdrv_invalidate_cache_all of of coroutine context
Date: Mon, 7 Mar 2016 14:30:21 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 07/03/2016 13:49, Dr. David Alan Gilbert wrote:
>    b) The harder problem is that there's a race where qemu_bh_delete
>       segs, and I'm not 100% sure why yet - it only does it sometime
>       (i.e. run virt-test and leave it and it occasionally does it).
>       From the core it looks like qemu->bh is corrupt (0x10101010...)
>       so maybe mis has been freed at that point?
>       I'm suspecting this is the postcopy_ram_listen_thread freeing
>       mis at the end of it, but I don't know yet.

That should be it.  Maybe the patch can simply be reverted, because
loadvm_postcopy_handle_run runs from a thread and not a coroutine.  Is
this correct?

However I have a bug or two for you to fix, too:

1) as far as I can see, postcopy_ram_listen_thread is not holding the
mutex during the call to qemu_loadvm_state_main.  Is that a bug?

2) no one is currently joining mis->listen_thread, I suspect it actually



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