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Date:   Sat, 15 Jan 2022 18:05:22 -0800
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From:   Andrew than <linux_kernel_aathan@memeplex.com>
Subject: Catastrophic data loss in Mac OS X VirtualBox guest running Linux
 ubuntu 5.11.0-41-generic
To:     linux-kernel@vger.kernel.org
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Please cc: me on any response, I am not subscribed to LKML

I've posted this issue on the Virtual Box bug reporting site at Oracle, 
but I'm not sure whether it's a VirtualBox only issue.

Would someone please direct me as to how best to pursue this issue with 
the kernel gods? It's not clear to me that the problem is in a storage 
driver because I was also getting soft lockup errors reported prior to 
the data loss.

[1359528.850122] systemd-journald[284]: Failed to write entry (22 items, 739 bytes), ignoring: Read-only file system


(the above dmesg reported error occurs many many times with different 
timestamps of course)

which seems to stem from:

Jan 15 21:35:14 ubuntu CRON[1188952]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Jan 15 21:37:35 ubuntu kernel: [1355482.810724] ata3.00: exception Emask 0x0 SAct 0x8000000 SErr 0x0 action 0x6 frozen
Jan 15 21:37:35 ubuntu kernel: [1355482.810769] ata3.00: failed command: WRITE FPDMA QUEUED
Jan 15 21:37:35 ubuntu kernel: [1355482.810786] ata3.00: cmd 61/10:d8:90:a0:53/00:00:00:00:00/40 tag 27 ncq dma 8192 out
Jan 15 21:37:35 ubuntu kernel: [1355482.810786]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Jan 15 21:37:35 ubuntu kernel: [1355482.810824] ata3.00: status: { DRDY }
Jan 15 21:37:35 ubuntu kernel: [1355482.810839] ata3: hard resetting link
Jan 15 21:37:37 ubuntu kernel: [1355485.044289] ata3: SATA link down (SStatus 1 SControl 300)
Jan 15 21:37:42 ubuntu kernel: [1355490.294132] ata3: hard resetting link
Jan 15 21:37:45 ubuntu kernel: [1355492.509352] ata3: SATA link down (SStatus 1 SControl 300)
Jan 15 21:38:07 ubuntu kernel: [1355497.707142] ata3: hard resetting link


Sorry about the formatting of these ... although looking at this again, 
maybe it *is* an issue with the SATA drivers that affects any system 
that writes to disk??

[483574.483756] watchdog: BUG: soft lockup - CPU#1 stuck for 22s! 
[swapper/1:0] Jan 6 11:36:36 ubuntu kernel: [541789.358312] watchdog: 
BUG: soft lockup - CPU#1 stuck for 23s! [swapper/1:0] Jan 6 13:37:15 
ubuntu kernel: [549027.924906] watchdog: BUG: soft lockup - CPU#1 stuck 
for 21s! [swapper/1:0] Jan 6 13:37:15 ubuntu kernel: 
[549027.925052] do_softirq+0xce/0x281 Jan 6 13:37:15 ubuntu kernel: 
[549027.925059] do_softirq_own_stack+0x3d/0x50 Jan 7 05:12:07 ubuntu 
kernel: [605122.533658] watchdog: BUG: soft lockup - CPU#1 stuck for 
21s! [swapper/1:0]