linux-kernel - Re: [4.8.0-rc1] am335x-evm boot failure: n_tty_receive_buf_common: "Unable to handle kernel paging request.."

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Date:   Sat, 10 Sep 2016 00:23:16 +0200
From:   Matthijs van Duin <matthijsvanduin@...il.com>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     Tony Lindgren <tony@...mide.com>,
        "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
        linux-arm <linux-arm-kernel@...ts.infradead.org>,
        Peter Hurley <peter@...leysoftware.com>,
        Lokesh Vutla <lokeshvutla@...com>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [4.8.0-rc1] am335x-evm boot failure: n_tty_receive_buf_common:
 "Unable to handle kernel paging request.."

If you look more carefully the first problem is actually a bus error:
[ 15.776190] Unhandled fault: external abort on non-linefetch (0x1028)
at 0xf9e3e044
[ 15.825925] PC is at omap_hwmod_read+0x14/0x28
[ 15.830583] LR is at omap_rtc_wait_not_busy+0x1c/0x44

I have no idea how the kernel manages to continue after a bus error in
a driver (inside local_irq_disable even), but I wouldn't be inclined
to take any later errors seriously.

See also the "4.8 crash on BeagleBone" thread on linux-omap.

Matthijs