linux-ext4 - BUG: 6.10: ext4 mpage_process_page_bufs() BUG

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Message-ID: <ZtirReiX7J+MDhuh@shell.armlinux.org.uk>
Date: Wed, 4 Sep 2024 19:47:33 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Theodore Ts'o <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>
Cc: linux-ext4@...r.kernel.org
Subject: BUG: 6.10: ext4 mpage_process_page_bufs() BUG_ON triggers

With a 6.10 based kernel, no changes to filesystem/MM code, I'm
seeing a reliable BUG_ON() within minutes of booting on one of my
VMs. I don't have a complete oops dump, but this is what I do
have, cobbled together from what was logged by journald, and
what syslogd was able to splat on the terminals before the VM
died.

Sep 04 15:51:46 lists kernel: kernel BUG at fs/ext4/inode.c:1967!

[ 1346.494848] Call trace:
[ 1346.495409] [<c04b4f90>] (mpage_process_page_bufs) from [<c04b938c>] (mpage_prepare_extent_to_map+0x410/0x51c)
[ 1346.499202] [<c04b938c>] (mpage_prepare_extent_to_map) from [<c04bbc40>] (ext4_do_writepages+0x320/0xb94)
[ 1346.502113] [<c04bbc40>] (ext4_do_writepages) from [<c04bc5dc>] (ext4_writepages+0xc0/0x1b4)
[ 1346.504662] [<c04bc5dc>] (ext4_writepages) from [<c0361154>] (do_writepages+0x68/0x220)
[ 1346.506974] [<c0361154>] (do_writepages) from [<c0354868>] (filemap_fdatawrite_wbc+0x64/0x84)
[ 1346.509165] [<c0354868>] (filemap_fdatawrite_wbc) from [<c035706c>] (__filemap_fdatawrite_range+0x50/0x58)
[ 1346.511414] [<c035706c>] (__filemap_fdatawrite_range) from [<c035709c>] (filemap_flush+0x28/0x30)
[ 1346.513518] [<c035709c>] (filemap_flush) from [<c04a8834>] (ext4_release_file+0x70/0xac)
[ 1346.515312] [<c04a8834>] (ext4_release_file) from [<c03f8088>] (__fput+0xd4/0x2cc)
[ 1346.517219] [<c03f8088>] (__fput) from [<c03f3e64>] (sys_close+0x28/0x5c)
[ 1346.518720] [<c03f3e64>] (sys_close) from [<c0200060>] (ret_fast_syscall+0x0/0x5c)

>From a quick look, I don't see any patches that touch fs/ext4/inode.c
that might address this.

I'm not able to do any debugging, and from Friday, I suspect I won't
even be able to use a computer (due to operations on my eyes.)

-- 
*** please note that I probably will only be occasionally responsive
*** for an unknown period of time due to recent eye surgery making
*** reading quite difficult.

RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!