| From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Noah Misch <noah(at)leadboat(dot)com>, Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Direct I/O |
| Date: | 2023-04-10 07:27:27 |
| Message-ID: | CA+hUKGLrqOPsriO=pnYDBHcnMh9hzhxC-ds+yudRAT4GEE3Eqg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Apr 10, 2023 at 2:57 PM Andres Freund <andres(at)anarazel(dot)de> wrote:
> Have you tried to write a reproducer for this that doesn't involve postgres?
I tried a bit. I'll try harder soon.
> ... What kernel version did you repro
> this on Thomas?
Debian's 6.0.10-2 kernel (Debian 12 on a random laptop). Here's how I
set up a test btrfs in case someone else wants a head start:
truncate -s2G 2GB.img
sudo losetup --show --find 2GB.img
sudo mkfs -t btrfs /dev/loop0 # the device name shown by losetup
sudo mkdir /mnt/tmp
sudo mount /dev/loop0 /mnt/tmp
sudo chown $(whoami) /mnt/tmp
cd /mnt/tmp
/path/to/initdb -D pgdata
... (see instructions further up for postgres command line + queries to run)
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