linux-kernel - Re: [REGRESSION] 9pfs issues on 6.12-rc1

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Message-ID: <2171405.1729521950@warthog.procyon.org.uk>
Date: Mon, 21 Oct 2024 15:45:50 +0100
From: David Howells <dhowells@...hat.com>
To: Antony Antony <antony@...nome.org>
Cc: dhowells@...hat.com, Sedat Dilek <sedat.dilek@...il.com>,
    Maximilian Bosch <maximilian@...sch.me>,
    Linux regressions mailing list <regressions@...ts.linux.dev>,
    LKML <linux-kernel@...r.kernel.org>, linux-fsdevel@...r.kernel.org,
    Christian Brauner <brauner@...nel.org>
Subject: Re: [REGRESSION] 9pfs issues on 6.12-rc1

Can you tell me what parameters you're mounting 9p with?  Looking at the
backtrace:

[   32.390878]  bad_page+0x70/0x110
[   32.391056]  free_unref_page+0x363/0x4f0
[   32.391257]  p9_release_pages+0x41/0x90 [9pnet]
[   32.391627]  p9_virtio_zc_request+0x3d4/0x720 [9pnet_virtio]
[   32.391896]  ? p9pdu_finalize+0x32/0xa0 [9pnet]
[   32.392153]  p9_client_zc_rpc.constprop.0+0x102/0x310 [9pnet]
[   32.392447]  ? kmem_cache_free+0x36/0x370
[   32.392703]  p9_client_read_once+0x1a6/0x310 [9pnet]
[   32.392992]  p9_client_read+0x56/0x80 [9pnet]
[   32.393238]  v9fs_issue_read+0x50/0xd0 [9p]
[   32.393467]  netfs_read_to_pagecache+0x20c/0x480 [netfs]
[   32.393832]  netfs_readahead+0x225/0x330 [netfs]
[   32.394154]  read_pages+0x6a/0x250

it's using buffered I/O, but when I try and use 9p from qemu, it wants to use
unbuffered/direct I/O.

David