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Date:      Wed, 20 Nov 2019 09:31:36 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 241980] panic: I/O to pool appears to be hung on vdev
Message-ID:  <bug-241980-227-QwbIST2Bun@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-241980-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-241980-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D241980

--- Comment #20 from Eugene Grosbein <eugen@freebsd.org> ---
This is dedicated server in Hetzner. Well, it has another SATA controller s=
een
as:

ahci0@pci0:0:17:5:      class=3D0x010601 card=3D0x07161028 chip=3D0xa1d2808=
6 rev=3D0x09
hdr=3D0x00
    vendor     =3D 'Intel Corporation'
    device     =3D 'C620 Series Chipset Family SSATA Controller [AHCI mode]'
    class      =3D mass storage
    subclass   =3D SATA

But first I'd like to disable panicing by zfs_deadman and see if distinct Z=
FS
boot pool is alive in such moment. I already tried booting patched zfs.ko by
means of nextboot.conf and
module_path=3D"/boot/nextboot;/boot/kernel;/boot/modules". Additionally, I'=
ve
enabled hardware watchdog in BIOS setup (the server has distinct public IP =
for
console via virtual KVM) and enabled watchdogd.

Sadly, I made a misprint and it booted with default unpatched zfs.ko and I
missed that, so another same panic that occured today gave me little but
interesting information: the watchdog works and dmesg buffer is not cleared
between reboots, so I have KDB trace in /var/log/kernel.log after reboot
(kern.* messages logged there). I've fixed the misprint, will reboot again =
and
wait.

Thank you for your remark about early warning, now I see you are right. I'll
fix it.

--=20
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