Re: PROBLEM: SLAB use-after-free with ceph(fs)

Bastian Blank
2022-01-04T12:20:56Z

Hi

On Tue, Jan 04, 2022 at 07:00:31AM -0500, Jeff Layton wrote:
> On Tue, 2022-01-04 at 10:49 +0100, Bastian Blank wrote:
> > > [152791.777458] cache_from_obj: Wrong slab cache. jbd2_journal_handle but object is from kmalloc-256

> At first blush, this looks like the same problem as:
> https://tracker.ceph.com/issues/52283
> ...but that should have been fixed in v5.14.

Nope, does not make sense. This reported issue tried to free a
"ceph_cap_flush", while mine tries to free "jbd2_journal_handle", which
is far away.

> You may also want to try v5.16-rc8 if you're able to build your own
> kernels. There were some patches that went in to improve how the client
> handles inodes that become inaccessible.

I try to get them to install a 5.16-rc8 or newer, get a new crash dump
and report that to https://tracker.ceph.com/.

Thanks,
Bastian

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