I just had a quick look at "vt_core.c" with regard to callouts. And have the following comments:

1) Make sure callout_reset(), callout_schedule() and callout_stop() is always called locked. When no lock is specified, that means Giant!

2) callout_drain() must have an unlocked sleeping context, else use callout_stop() with the mutex specified in callout_init_mtx() to get atomicity.

For now adding MTX_RECURSE to "mtx_init(&main_vd->vd_lock, "vtdev", NULL, MTX_DEF | MTX_RECURSE)" solved my problem temporarily, because callout_drain() tried to get the vd_lock, which was already taken.

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