[Bug 211390] emulators/virtualbox-ose panic with aio(4)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211390

            Bug ID: 211390
           Summary: emulators/virtualbox-ose panic with aio(4)
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: vbox at FreeBSD.org
          Reporter: rwestlun at gmail.com
          Assignee: vbox at FreeBSD.org
             Flags: maintainer-feedback?(vbox at FreeBSD.org)

Running 12-CURRENT r303286 with virtualbox-ose-5.0.26

VirtualBox panics when launching a VM.


> vboxdrv: ffffffff82973020 VMMR0.r0
> vboxdrv: ffffffff82a92020 VBoxDDR0.r0
> vboxdrv: ffffffff82aaf020 VBoxDD2R0.r0
> panic: _mtx_lock_sleep: recursed on non-recursive mutex aiomtx @ /usr/src/sys/kern/vfs_aio.c:996
>
> cpuid = 1
> KBD: stack backtrace:
> db_trace_wrapper() at db_trace_wrapper+0x2b
> vpanic() at vpanic+0x182
> kassert_panic() at kassert_panic+0x126
> __mtx_lock_sleep() at __mtx_lock_sleep+0x228
> __mtx_lock_flags() at __mtx_lock_flags+0x10d
> aio_queue() at aio_queue+0x9d6
> amd64_syscall() at amd64_syscall+0x2db
> Xfast_syscall() at Xfast_syscall+0xfb
> --- syscall (465, FreeBSD ELF64, sys_aio_fsync), rip = 0x80119fa0a, rsp = 0x7fffdf2abc98, rbp = 0x7fffdf2abcd0 ---
> KDB: enter: panic
> [ thread pid 14588 tid 101813 ]
> Stopped at      kdb_enter+0x3b: movq    $0,kdb_why

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