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Date:      Sun, 16 Aug 2020 19:19:34 +0200
From:      Hans Petter Selasky <hps@selasky.org>
To:        Alexandre Levy <a13xlevy@gmail.com>
Cc:        freebsd-current@freebsd.org
Subject:   Re: Kernel crash during video transcoding
Message-ID:  <5fe820c0-69af-8c41-69d6-a3c33ed55e2e@selasky.org>
In-Reply-To: <CAEWSB33-harOEk3v4rWBMQQJwfOtJmap-qBqAjc33__nLYKLrQ@mail.gmail.com>
References:  <CAEWSB323c2zapSG30OS5T30Wd_bpT=7NbvrPtsyQDRRHQUf7qA@mail.gmail.com> <13793020-1bde-b13f-65e3-909e27d876ad@selasky.org> <CAEWSB323KtVrixgRyKsekdgcGjFm4kUqG6qDE59Aev3Cc6sYBg@mail.gmail.com> <4e9d9a89-4883-1f1c-c796-e5925fd171cc@selasky.org> <CAEWSB30YNwQ7Bpv00P-B=TTHCqT_aFm30552n51Pic1uN5hnZQ@mail.gmail.com> <CAEWSB33_ka2aQb81UmODu72Be_9Vvqi4Qb-jfXHEZ1HgCqwADQ@mail.gmail.com> <51a2fe4f-5a3e-8d24-19e2-3cdaa8378015@selasky.org> <CAEWSB32oKbaE4M=V3H8F9rJv%2BL1ivKejhGAXmHMxOKkyYQLCxg@mail.gmail.com> <CAEWSB33-harOEk3v4rWBMQQJwfOtJmap-qBqAjc33__nLYKLrQ@mail.gmail.com>

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On 2020-08-16 17:28, Alexandre Levy wrote:
> Now at intel_freebsd.c:193 (frame #17) the driver calls
> vm_page_busy_acquire(m, VM_ALLOC_WAITFAIL). 'm' is the page grabbed from
> vm_obj of the calling frame.

Can you check if "m" is NULL at this point?

--HPS



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