I had similar problem with the PCMCIA (PCcard), supermount and umount.
On Sat, 24 Jun 2000, Ookhoi wrote:
> Date: Sat, 24 Jun 2000 11:41:31 +0200
> From: Ookhoi <ookhoi@dds.nl>
> To: reiserfs@devlinux.com, linux-kernel@vger.rutgers.edu
> Subject: (reiserfs) kernel BUG at buffer.c:1459! (2.4.0-test1-ac22-riel +
> reiserfs 3.6.9)
>
> Hi!
>
> I did:
> mkreiserfs -h rupasov /dev/sda5
> mkdir /tmp/home
> mount /dev/sda7 /tmp/home
> cd /home
> find . -xdev | cpio -vdump /tmp/home
> umount /tmp/home
>
> then it said:
>
> kernel BUG at buffer.c:1459!
> invalid operand: 0000
> CPU: 0
> etc. (can give the whole error, but have to copy it by hand, and
> buffer.c:1459 says:
>
> /**
> * discard_buffer - discard that buffer without doing any IO
> * @bh: buffer to discard
> *
> * This function removes a buffer from all the queues, without doing
> * any IO, we are not interested in the contents of the buffer. This
> * function can block if the buffer is locked.
> */
> static inline struct buffer_head *discard_buffer(struct buffer_head *
> bh)
> {
> struct buffer_head *next;
>
> if (bh->b_dev == B_FREE)
> BUG(); <=== 1459
>
> next = bh->b_this_page;
>
> unmap_buffer(bh);
>
> spin_lock(&lru_list_lock);
> write_lock(&hash_table_lock);
> spin_lock(&unused_list_lock);
>
> if (atomic_read(&bh->b_count))
> BUG();
>
> The error is caused by umount (according to the error), and umount
> itself stops with a Segmentation fault.
>
> /home contains one fresh home dir with only .bash_logout, .bash_profile
> and .bashrc
>
> After this the reiserfs partition is not mounted anymore (ls /tmp/home
> is empty), but the entry is still in /etc/mtab
> A new mount /dev/sda7 /tmp/home hangs in D state, and can't be killed
> (kill -9). The same for sync, and also for <alt><sysrq><s>, which will
> sync /dev/sda3 (ext2) (gives OK), but hangs on /dev/sda7. (shutdown -r
> now also hangs of course).
>
> After reboot, I can mount the reiserfs partition oke, can umount it oke,
> mount it again oke, touch a new file, umount it oke, mount it oke, cp
> /usr/src/linux-2.4.0-test1.tar.gz to it, umount fails again.
>
> If I sync after the cp instead of umount, sync hangs.
>
> This is kernel 2.4.0-test1-ac22-riel and reiserfs 3.6.9
> Adaptec AHA-2940 Ultra2 SCSI host adapter with a QUANTUM ATLAS_V_18_WLS
>
> Please mail me if more info is needed.
>
> Ookhoi
>
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