[Xen-devel] Re: [PATCH] mem_sharing: fix race condition of nominate and unshare

[Jui-Hao Chiang <juihaochiang@xxxxxxxxx>]

Hi, tinnycloud:

Do you have xenpaging tools running properly?
I haven't gone through that one, but it seems you have run out of memory.
When this case happens, mem_sharing will request memory to the
xenpaging daemon, which tends to page out and free some memory.
Otherwise, the allocation would fail.
Is this your scenario?

Bests,
Jui-Hao

2011/1/17 MaoXiaoyun <tinnycloud@xxxxxxxxxxx>:
> Another failure on BUG() in mem_sharing_alloc_page()
>
>  memset(&req, 0, sizeof(req));
>  if(must_succeed)
>     {
>         /* We do not support 'must_succeed' any more. External operations
> such
>          * as grant table mappings may fail with OOM condition!
>          */
>         BUG();===================>bug here
>     }
>     else
>     {
>         /* All foreign attempts to unshare pages should be handled through
>          * 'must_succeed' case. */
>         ASSERT(v->domain->domain_id == d->domain_id);
>         vcpu_pause_nosync(v);
>         req.flags |= MEM_EVENT_FLAG_VCPU_PAUSED;
>     }
>

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