From mboxrd@z Thu Jan  1 00:00:00 1970
From: Emil Larsson <d99-ela@nada.kth.se>
Subject: mount -o loop generates oops using reiser4 snapshot 0730
Date: Thu, 19 Aug 2004 16:47:30 +0200
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When trying to mount anything looped onto a reiser4 file system, I get 
an oops and the computer becomes unusable.
A typical command causing the problem might be:

#mount -o loop /mnt /usr/src/sarge-i386-netinst.iso

My kernel version is 2.6.8-rc2 and I am using the 0730 reiser4 snapshot.

Please feel free for ask for any further information needed.

/Emil Larsson


Here is the oops:

Unable to handle kernel paging request at virtual address 1000c11a
 printing eip:
d23b9b10
*pde = 00000000
Oops: 0002 [#1]
PREEMPT
Modules linked in: sbp2 nbd iptable_filter ip_tables thermal processor 
dm_crypt
dm_mod aes loop ohci1394 ieee1394 nvidia dl2k via_agp via_rhine mii crc32
CPU:    0
EIP:    0060:[<d23b9b10>]    Tainted: P 
EFLAGS: 00010282   (2.6.8-rc2-love3)
EIP is at 0xd23b9b10
eax: c11f3080   ebx: 00000000   ecx: 00000000   edx: e612bf74
esi: 00001000   edi: e612be9c   ebp: 00001000   esp: e612be04
ds: 007b   es: 007b   ss: 0068
Process loop0 (pid: 8461, threadinfo=e612a000 task=e5b4ce50)
Stack: f8a436a4 e612bf74 00000000 c11f3080 00000000 cc884620 e612bec8 
00001000
       00000000 00000000 e612bec8 e612bf74 c11f3080 00000000 00001000 
00000000
       c01fe544 e612be68 c11f3080 00000000 00001000 e612a000 00000000 
cc884620
Call Trace:
 [<f8a436a4>] lo_read_actor+0xa4/0xd0 [loop]
 [<c01fe544>] sendfile_common+0x184/0x270
 [<c01fe6b0>] sendfile_unix_file+0x80/0xa0
 [<f8a43600>] lo_read_actor+0x0/0xd0 [loop]
 [<c01d2962>] reiser4_sendfile+0xb2/0xd0
 [<f8a43600>] lo_read_actor+0x0/0xd0 [loop]
 [<f8a43736>] do_lo_receive+0x66/0x80 [loop]
 [<f8a43600>] lo_read_actor+0x0/0xd0 [loop]
 [<f8a437b2>] lo_receive+0x62/0x90 [loop]
 [<f8a4382c>] do_bio_filebacked+0x4c/0x80 [loop]
 [<f8a43b11>] loop_thread+0xa1/0x110 [loop]
 [<f8a43a70>] loop_thread+0x0/0x110 [loop]
 [<c0102301>] kernel_thread_helper+0x5/0x14
Code: 80 a3 1a c1 00 10 00 00 00 00 00 00 e5 e5 e5 00 a0 3c 39 c1