linux-ext4 - [Bug 16312] WARNING: at fs/fs-writeback.c:1127 __mark_inode

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Message-Id: <201007261753.o6QHr4Gr004228@demeter.kernel.org>
Date:	Mon, 26 Jul 2010 17:53:04 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 16312] WARNING: at fs/fs-writeback.c:1127 __mark_inode_dirty

https://bugzilla.kernel.org/show_bug.cgi?id=16312





--- Comment #9 from Larry Finger <Larry.Finger@...inger.net>  2010-07-26 17:53:04 ---
These patches break my system (the one reported in Bug #16122). It obviously is
different.

After installing the patches. I get a NULL pointer dereference for address 0x30
as __mark_inode_dirty + 0xf0/0x1a0 (x86_64 system). The code offset 0xf30. I
have a 2.6.35-rc6 kernel.

The assembler code around that address is

/home/finger/linux-temp/fs/fs-writeback.c:960
     f28:       4d 8b ac 24 b0 01 00    mov    0x1b0(%r12),%r13
     f2f:       00 
/home/finger/linux-temp/fs/fs-writeback.c:962
     f30:       41 f6 45 30 02          testb  $0x2,0x30(%r13)
     f35:       75 31                   jne    f68 <__mark_inode_dirty+0x128>
     f37:       41 f6 45 28 10          testb  $0x10,0x28(%r13)
     f3c:       75 2a                   jne    f68 <__mark_inode_dirty+0x128>

The code at line 960 is:

        struct backing_dev_info *bdi = wb->bdi;

        if (bdi_cap_writeback_dirty(bdi) &&
            !test_bit(BDI_registered, &bdi->state)) {
                WARN_ON(1);
                printk(KERN_ERR "bdi-%s not registered\n",
                       bdi->name);
        }

and wb->bdi is NULL.

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