Date: Thu, 30 Nov 2023 07:58:49 +1100 From: Trev <freebsd-stable1@sentry.org> To: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: ZFS high CPU use after backup and panic on shutdown Message-ID: <e8a9d090-f8e9-78f0-37c7-a1e7bfc2a4dc@sentry.org> In-Reply-To: <67606352-8546-7016-5e65-0f5c4dec8a19@sentry.org> References: <6ccc544a-7919-57ab-5572-db67fa09ae76@sentry.org> <67606352-8546-7016-5e65-0f5c4dec8a19@sentry.org>
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Trev wrote on 28/11/23 12:09 am:
> Trev wrote on 25/11/23 2:39 pm:
>> I recently updated from source FreeBSD 12-STABLE to FreeBSD 13-STABLE
>> (stable/13-221a60a42: Tue Nov 14 15:36:40 AEDT 2023).
>>
>> Ever since, after my ZFS backup to an external USB drive, the system
>> continues to consume 100% of one core of the 2011 Mac mini (i7, 16G).
>>
>> Example backup command from my shell script:
>>
>> zfs send data/www@${snapshot} | bzip2 > /mnt/zfs-data-www-${snapshot}.bz2
>>
>> Neither top, vmstat nor iostat give any clue as to what system process
>> is using 100% of one core. To stop this phenomenon I have to shutdown
>> and reboot the system which I do with "shutdown -r now".
>>
>> This always results in a kernel panic:
>
> [CHOMP]
>
> Resolved by updating the source to stable/13-ecb4d2c6e: Sat Nov 25
> 11:31:12 AEDT 2023 and rebuilding.
>
> [Also, thanks to Mike Karels for off-list help with top.]
ARGH. After a few days the issue has again returned. top -S -H shows
that the process which continues to consume 100% of one CPU core is
arc_prune, the same process that causes a kernel panic on shutdown.
Any ideas on how to resolve this?
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