From: Kent Overstreet <kent.overstreet@linux.dev>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: syzkaller@googlegroups.com,
Thomas Bertschinger <tahbertschinger@gmail.com>,
Ariel Miculas <ariel.miculas@gmail.com>,
linux-bcachefs@vger.kernel.org
Subject: Re: syzbot for bcachefs?
Date: Thu, 4 Apr 2024 19:16:14 -0400 [thread overview]
Message-ID: <aw5elbevdhwuqr7ecap6i5hepvkjbgs5xexq7nvu2yvuhh5bpb@tmyjcruysqjf> (raw)
In-Reply-To: <CACT4Y+ZEPWbJsYvWauog95yRFuzZmA=tK-uS+aDT-x=jnc3f7Q@mail.gmail.com>
On Thu, Apr 04, 2024 at 10:33:07AM +0200, Dmitry Vyukov wrote:
> On Thu, 4 Apr 2024 at 01:59, Kent Overstreet <kent.overstreet@linux.dev> wrote:
> >
> > Hi - what would it take to get syzbot going for bcachefs?
>
> Hi Kent,
>
> There are 2 parts:
>
> The easy one: we need to enable it in syzbot configs. Should we
> configure it as follows?
>
> CONFIG_BCACHEFS_FS=y
> CONFIG_BCACHEFS_QUOTA=y
> CONFIG_BCACHEFS_ERASURE_CODING=y
> CONFIG_BCACHEFS_POSIX_ACL=y
> CONFIG_BCACHEFS_DEBUG=y
> # CONFIG_BCACHEFS_TESTS is not set
> # CONFIG_BCACHEFS_LOCK_TIME_STATS is not set
> # CONFIG_BCACHEFS_NO_LATENCY_ACCT is not set
> CONFIG_BCACHEFS_SIX_OPTIMISTIC_SPIN=y
>
> In particular, I am interested in CONFIG_BCACHEFS_DEBUG. Does it
> really add more debug checks rather than lots of console printing w/o
> checks? Some "DEBUG" kernel configs are misleading here. Checks will
> be useful on syzbot, lots of printing not so much.
CONFIG_BCACHEFS_DEBUG adds piles of assertions and no extra console
printing :)
> Second part: syzbot will need to exercise the fs in some useful way.
> Is it just a "normal" fs with files, or something special?
It's a normal - but multi device - filesystem, similar featureset to
btrfs.
> Is it mounted from an image, or an image-less fs? If it needs images,
> how can they be created?
apt install bcachefs-tools
mkfs.bcachefs <dev>
mount <dev> /mnt
...
> "find tools/testing/ Documentation/ -name "*bcachefs*"" does not give
> me anything useful.
https://bcachefs.org/ has some docs, and the tools have a man page
Anything else you'd be interested in? Thomas was interested in working
on on-disk-image error injection, is that something that would be
useful?
Ariel's also probably going to be working on adding full image creation
to mkfs, i.e. pass it a directory - is that something that would be
useful as well?
next parent reply other threads:[~2024-04-04 23:16 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <oxdwygzxpbpwxgl5v5hzaj7er6oxt2rlmaobkov4t23xqptqrn@gxi3nlapfini>
[not found] ` <CACT4Y+ZEPWbJsYvWauog95yRFuzZmA=tK-uS+aDT-x=jnc3f7Q@mail.gmail.com>
2024-04-04 23:16 ` Kent Overstreet [this message]
2024-04-05 16:20 ` syzbot for bcachefs? Aleksandr Nogikh
2024-04-19 8:35 ` Dmitry Vyukov
2024-04-19 17:19 ` Kent Overstreet
2024-05-02 20:28 ` Aleksandr Nogikh
2024-05-03 15:36 ` Kent Overstreet
2024-05-03 16:31 ` Aleksandr Nogikh
2024-05-03 17:18 ` Kent Overstreet
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