Re: [RFC PATCH] ceph: Fix kernel crash in generic/397 test

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To: Ilya Dryomov <idryomov@xxxxxxxxx>, Viacheslav Dubeyko <Slava.Dubeyko@xxxxxxx>
Subject: Re: [RFC PATCH] ceph: Fix kernel crash in generic/397 test
From: David Howells <dhowells@xxxxxxxxxx>
Date: Fri, 17 Jan 2025 21:29:52 +0000
Cc: dhowells@xxxxxxxxxx, "ceph-devel@xxxxxxxxxxxxxxx" <ceph-devel@xxxxxxxxxxxxxxx>, Alex Markuze <amarkuze@xxxxxxxxxx>, "linux-fsdevel@xxxxxxxxxxxxxxx" <linux-fsdevel@xxxxxxxxxxxxxxx>, "slava@xxxxxxxxxxx" <slava@xxxxxxxxxxx>
In-reply-to: <CAOi1vP9jKOuBetRPZCDeUAdiOmQTYLKSSgX4YYQFt72H-t_j6A@mail.gmail.com>
Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903
References: <CAOi1vP9jKOuBetRPZCDeUAdiOmQTYLKSSgX4YYQFt72H-t_j6A@mail.gmail.com> <266c50167604c606c95a6efe575de5430c31168b.camel@ibm.com> <CAOi1vP-=8QLaQqYTrZpe6s=hkAmNm8Z-upOeQvTQYY-uosxg8A@mail.gmail.com>

Note that netfslib provides some tracepoints that you can use to try and
illuminate what's going on there.

echo 1 > /sys/kernel/debug/tracing/events/netfs/netfs_read/enable
echo 1 > /sys/kernel/debug/tracing/events/netfs/netfs_rreq/enable
echo 1 > /sys/kernel/debug/tracing/events/netfs/netfs_sreq/enable
echo 1 > /sys/kernel/debug/tracing/events/netfs/netfs_failure/enable

for starters.

David

References:
- Re: [RFC PATCH] ceph: Fix kernel crash in generic/397 test
  - From: Ilya Dryomov
- [RFC PATCH] ceph: Fix kernel crash in generic/397 test
  - From: Viacheslav Dubeyko
- Re: [RFC PATCH] ceph: Fix kernel crash in generic/397 test
  - From: Ilya Dryomov

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