Date: Thu, 30 Apr 2026 20:12:46 +0200 From: =?UTF-8?Q?Jean-S=C3=A9bastien_P=C3=A9dron?= <dumbbell@FreeBSD.org> To: freebsd-current@freebsd.org Subject: Re: openzfs panic: VERIFY3U(offset, <, dn->dn_datablksz) failed Message-ID: <07ab9cba-8089-4fd3-9bc7-31bbdbf0bffe@FreeBSD.org> In-Reply-To: <34C033D4-AC92-4E11-A130-AFFBAB6CCB45@FreeBSD.org> References: <d41fa969c39062e325e1991616708a6d@Leidinger.net> <34C033D4-AC92-4E11-A130-AFFBAB6CCB45@FreeBSD.org>
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On 25/04/2026 10:24, Kristof Provost wrote:
> On 24 Apr 2026, at 14:18, Alexander Leidinger wrote:
> recent current (last commit 2026-04-23-222413).
>
> short:
> #3 0xffffffff805502f7 in vpanic (
> fmt=0xffffffff82556d5d "VERIFY3U(offset, <, dn->dn_datablksz) failed
> (%llu < %llu)\n", ap=ap@entry=0xfffffe0228f57c70)
> at /space/system/usr_src/sys/kern/kern_shutdown.c:974
> buf = "VERIFY3U(offset, <, dn->dn_datablksz) failed
> (9223372036854775807 < 24576)\n", '\000' <repeats 180 times>
> __pc = 0x0
> __pc = 0x0
> __pc = 0x0
> other_cpus = {__bits = {16777213, 0 <repeats 15 times>}}
> td = 0xfffff80741b6e780
> bootopt = <unavailable>
> newpanic = <optimized out>
>
> I’m seeing the same panic (somewhat regularly, without obvious trigger),
> so I’m fairly confident it’s not some obscure corruption in your pool.
I get it while working on RabbitMQ as well, 100% reproducible. I shared
what I think I understand of the problem on the pull request that added
POSIX_FADV_DONTNEED support:
https://github.com/openzfs/zfs/pull/18399
However, the patch I drafted, even though it does not cause the panic
anymore, is incorrect as I misunderstood that code.
--
Jean-Sébastien Pédron
The FreeBSD Project
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