linux-kernel - Re: [PATCH] rd: Mark ramdisk buffers heads dirty

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <200710171814.01717.borntraeger@de.ibm.com>
Date:	Wed, 17 Oct 2007 18:14:01 +0200
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <nickpiggin@...oo.com.au>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	"Theodore Ts'o" <tytso@....edu>, stable@...nel.org
Subject: Re: [PATCH] rd: Mark ramdisk buffers heads dirty

Eric,

Am Dienstag, 16. Oktober 2007 schrieb Christian Borntraeger:
> Am Dienstag, 16. Oktober 2007 schrieb Eric W. Biederman:
> 
> > fs/buffer.c |    3 +++
> > 1 files changed, 3 insertions(+), 0 deletions(-)
> >  drivers/block/rd.c |   13 +------------
> >  1 files changed, 1 insertions(+), 12 deletions(-)
> 
> Your patches look sane so far. I have applied both patches, and the problem 
> seems gone. I will try to get these patches to our testers.
> 
> As long as they dont find new problems:

Our testers did only a short test, and then they were stopped by problems with
reiserfs. At the moment I cannot say for sure if your patch caused this, but 
we got the following BUG

ReiserFS: ram0: warning: Created .reiserfs_priv on ram0 - reserved for xattr storage.
------------[ cut here ]------------
kernel BUG at /home/autobuild/BUILD/linux-2.6.23-20071017/fs/reiserfs/journal.c:1117!
illegal operation: 0001 [#1]
Modules linked in: reiserfs dm_multipath sunrpc dm_mod qeth ccwgroup vmur
CPU:    3    Not tainted
Process reiserfs/3 (pid: 2592, task: 77dac418, ksp: 7513ee88)
Krnl PSW : 070c3000 fb344380 (flush_commit_list+0x808/0x95c [reiserfs])
           R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:3 PM:0
Krnl GPRS: 00000002 7411b5c8 0000002b 00000000
           7b04d000 00000001 00000000 76d1de00
           7513eec0 00000003 00000012 77f77680
           7411b608 fb343b7e fb34404a 7513ee50
Krnl Code: fb344374: a7210002           tmll    %r2,2
           fb344378: a7840004           brc     8,fb344380
           fb34437c: a7f40001           brc     15,fb34437e
          >fb344380: 5810d8c2           l       %r1,2242(%r13)
           fb344384: 5820b03c           l       %r2,60(%r11)
           fb344388: 0de1               basr    %r14,%r1
           fb34438a: 5810d90e           l       %r1,2318(%r13)
           fb34438e: 5820b03c           l       %r2,60(%r11)


Looking at the code, this really seems related to dirty buffers, so your patch
is the main suspect at the moment. 

        if (!barrier) {
                /* If there was a write error in the journal - we can't commit
                 * this transaction - it will be invalid and, if successful,
                 * will just end up propagating the write error out to
                 * the file system. */
                if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
                        if (buffer_dirty(jl->j_commit_bh))
1117---->                                BUG();
                        mark_buffer_dirty(jl->j_commit_bh) ;
                        sync_dirty_buffer(jl->j_commit_bh) ;
                }
        }

Christian
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/