> > I have gotten this semi-reproducable bug three times already under the same
> > circumstances. The bug happens at approximately the same time as I kill
> > xterms after user-mode linux has crashed and I am cleaning up what it has
> > left behind. User mode linux is using a 1 gig file on a 6 gig reiser
> > filesystem. After each BUG I have reformated the filesystem and recreated
> > the image I am operating on, so it doesn't seem to be some long term bug
> > in the on disk information that I am just running into. For the specifics,
> > the first and second time I was running linux-2.4.0-prerelease with the
> > reiserfs-3.6.24 patch.
>
> Hmmm, could you try to reproduce under ext2? I'll see what I can find on the
> reiserfs side.
The good? news is that it isn't a reiserfs specific problem. The bad news
is it also happens with ext2. This is what I was doing: I have a 1GB image
file with the 74 megs that the first stage debian installer puts on the disk.
I make a few changes to it and then boot user mode linux on this image. In
uml I continue the debian installation off of cdrom and as I say ok to the
final screen I get a "Kernel panic: Kernel mode fault at addr 0xbefffe90, ip
0x1009f315" from user-mode linux which is running as me, not as root. I then
killall linux, which is the uml executable. Afterward I do a killall xterm,
as uml spawns an xterm for each virtual console. Immediately I get the BUG
message. This is with uml-2.4.0-prerelease running on real 2.4.0-prerelease
with reiserfs-3.6.25 on either a reiser or ext2 filesystem. I am not subscribed
to user-mode-linux-devel or linux-kernel, so cc me if I can provide any more
information. Everything has been compiled with gcc-2.91.66.
The decoded bug is:
kernel BUG at inode.c:371!
invalid operand: 0000
CPU: 0
EIP: 0010:[<c0140c1b>]
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010282
eax: 0000001b ebx: c3621240 ecx: 00000000 edx: 00000000
esi: 00076e57 edi: c3621240 ebp: c3621240 esp: c693bee0
ds: 0018 es: 0018 ss: 0018
Process xterm (pid: 3531, stackpage=c693b000)
Stack: c01cb3a4 c01cb424 00000173 c12c1800 c014b583 c3621240 c3621240 c01eff40
c3621240 c4821b60 c7ad7400 c38c2b40 00000116 0000001e 00000000 c1ac2c80
c014bce0 c014bd06 c3621240 c3621240 c01414de c3621240 c4821b60 c3621240
Call Trace: [<c01cb3a4>] [<c01cb424>] [<c014b583>] [<c014bce0>] [<c014bd06>]
[<c01414de>] [<c013f74e>]
[<c012ed70>] [<c012defc>] [<c0115dda>] [<c01163cf>] [<c0116536>] [<c0108d5f>]
Code: 0f 0b 83 c4 0c 8b 83 f0 00 00 00 a8 10 75 26 68 75 01 00 00
>>EIP; c0140c1b <clear_inode+33/e4> <=====
Trace; c01cb3a4 <tvecs+52f8/c5a4>
Trace; c01cb424 <tvecs+5378/c5a4>
Trace; c014b583 <ext2_free_inode+a7/180>
Trace; c014bce0 <ext2_delete_inode+90/c8>
Trace; c014bd06 <ext2_delete_inode+b6/c8>
Trace; c01414de <iput+a6/154>
Trace; c013f74e <dput+ee/144>
Trace; c012ed70 <fput+78/d0>
Trace; c012defc <filp_close+5c/64>
Trace; c0115dda <put_files_struct+42/b0>
Trace; c01163cf <do_exit+b7/1f4>
Trace; c0116536 <sys_exit+e/10>
Trace; c0108d5f <system_call+33/38>
Code; c0140c1b <clear_inode+33/e4>
00000000 <_EIP>:
Code; c0140c1b <clear_inode+33/e4> <=====
0: 0f 0b ud2a <=====
Code; c0140c1d <clear_inode+35/e4>
2: 83 c4 0c add $0xc,%esp
Code; c0140c20 <clear_inode+38/e4>
5: 8b 83 f0 00 00 00 mov 0xf0(%ebx),%eax
Code; c0140c26 <clear_inode+3e/e4>
b: a8 10 test $0x10,%al
Code; c0140c28 <clear_inode+40/e4>
d: 75 26 jne 35 <_EIP+0x35> c0140c50 <clear_inode+68/e4>
Code; c0140c2a <clear_inode+42/e4>
f: 68 75 01 00 00 push $0x175
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