Date: Sun, 07 Nov 2004 13:16:54 +0100 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Stefan Ehmann <shoesoft@gmx.net> Cc: current@freebsd.org Subject: Re: ext2fs related panic Message-ID: <22423.1099829814@critter.freebsd.dk> In-Reply-To: Your message of "Sun, 07 Nov 2004 13:10:38 %2B0100." <1099829438.890.11.camel@taxman>
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In message <1099829438.890.11.camel@taxman>, Stefan Ehmann writes: >On Sat, 2004-11-06 at 19:25, Poul-Henning Kamp wrote: >> Ok, can you try the stuff in current, I've made two commits >> and you want both. > >Thanks, these fix the previous panics reported by me. > >I was able to produce yet another panic: > >mount /mnt/stuff >mount -u -o rw /mnt/stuff >touch /mnt/stuff/foo >mount -u -o ro /mnt/stuff >umount /mnt/stuff > >At this point I get this: >g_vfs_done():ad1s1[WRITE(offset=4096, length=4096)]error = 1 >g_vfs_done():ad1s1[WRITE(offset=8192, length=4096)]error = 1 >g_vfs_done():ad1s1[WRITE(offset=20480, length=4096)]error = 1 >g_vfs_done():ad1s1[WRITE(offset=27380416512, length=4096)]error = 1 > >A few seconds later I get this: >Fatal trap 12: page fault while in kernel mode >current process = 55 (syncer) this is a long-standing bug in ext2fs which were previously masked by other issues: When downgrading a filesystem from r/w to r/o the dirty buffers are not flushed. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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