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Re: kern/53788: vt switching panic

The following reply was made to PR kern/53788; it has been noted by GNATS.

From: (Christos Zoulas)
Subject: Re: kern/53788: vt switching panic
Date: Sat, 15 Dec 2018 11:13:55 -0500

 On Dec 15, 11:50am, (Michael van Elst) wrote:
 -- Subject: Re: kern/53788: vt switching panic
 |  The usl_syncdata structure is usually allocated by the program that
 |  tries to own the display and freed when it returns ownership after
 |  being sent a signal. Both operations are done by an ioctl in process
 |  context.
 |  But when the owner process has died and someone tries to switch
 |  the display with ctrl-alt-fX, the free operation is done by the
 |  keyboard interrupt handler.
 |  Usually you don't see this as the X server catches most signals,
 |  even segfaults, and tries to give back ownership before it exits.
 So why don't we use a linked list of sync cookies to free or kmem_intr_alloc/
 kmem_intr_free. This will always panic with DIAGNOSTIC when there is a timeout.

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