From owner-freebsd-current@freebsd.org  Thu Apr 15 19:19:45 2021
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Reply-To: lev@FreeBSD.org
Subject: Re:
 FreeBSD-14.0-CURRENT-amd64-20210408-15dc713ceb5-245885-memstick.img fails to
 boot on Haswell-based laptop.
To: Dmitry Chagin <dchagin@freebsd.org>
Cc: FreeBSD Current <freebsd-current@freebsd.org>
References: <88fac685-ee3d-f9d6-d81d-1d8b5f3c7762@FreeBSD.org>
 <YHiIwDYKG/c2txAV@heemeyer.club>
From: Lev Serebryakov <lev@FreeBSD.org>
Organization: FreeBSD
Message-ID: <37dab5a0-3253-ee2f-c33f-6095016be134@FreeBSD.org>
Date: Thu, 15 Apr 2021 22:19:42 +0300
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On 15.04.2021 21:41, Dmitry Chagin wrote:

>> calltrap()
>> --- trap 0x9
>> run_interrupt_driven_config_hooks()
>> boot_run_interrupt_driven_config_hooks()
>> mi_startup()
>>
>>    It is 100% reproducible, and I cannot issue commands to kernel debugger, keyboard is dead.
>>
>>    Enabling verbose boot helps, with verbose boot it boots to installer.
>>
>>    Looks like some race condition.
>>
>>    Is it known problem?
> 
> try to boot verbose

  It is funny, but boot-verbose helps on battery and doesn't help with AC. I think, it is because with AC plugged in CPU is set to "performance" mode and delay from printing verbose information is not enough!

-- 
// Lev Serebryakov