bug report

destructive mind (dstrctive@hotmail.com)
Sat, 10 Jul 1999 00:30:27 MDT

The way I found/recreated this (bug?) is while trying to paste using gpm.
It only happens if I have scrolled up using shift+pageup. After scrolling
up if I start to select text with the mouse, it will kill gpm and output an
oops message. I ran this output through ksymoops and the output that it had
is listed below. I believe that this has to do with fbcon and buffering,
but that is just a weak guess. I have vesafb compiled into my kernel and I
use vga 773 mode for my console. If any other information about my system or
the way i created this, feel free to contact me. I would also like to thank
everyone for making linux as stable as possible.

Unable to handle kernel paging request at virtual address c87fc0e0
current->tss.cr3 = 0102b000, %cr3 = 0102b000
*pde = 00000000
Oops: 0002
CPU: 0
EIP: 0010:[<c01a8d6f>]
EFLAGS: 00010202
eax: 07070707 ebx: c01dd890 ecx: 00000000 edx: 0000000f
esi: c87fc0e0 edi: c020f688 ebp: 00000000 esp: c675de54
ds: 0018 es: 0018 ss: 0018
Process gpm (pid: 502, process nr: 43, stackpage=c675d000)
Stack: 00000000 0100002f 07070707 c0108c25 07070707 00000400
c87fc0e0 c01a3ca4
c7e3dc00 c020f688 c0088e3a 00000001 00ffffff 0000001c c0088e38
c0088e3a
0000001d 0000001c c0202cec c018a10b c7e3dc00 c0088e38 00000001
0100002f
Call Trace: [<c0108c25>] [<c01a3ca4>] [<c018a10b>] [<c018a49a>]
[<c018f7c9>] [<c012001c>] [<c018e365>]
[<c0192cdf>] [<c012a9b4>] [<c0192944>] [<c0107a84>]
Code: 89 06 8a 03 83 e0 0f 8b 7c 24 18 23 3c 85 58 cd 1d c0 89 f8
>>EIP: c01a8d6f <fbcon_cfb8_putcs+1af/2d0>
Trace: c0108c25 <handle_IRQ_event+31/68>
Trace: c01a3ca4 <fbcon_putcs+c4/e0>
Trace: c018a10b <do_update_region+10f/158>
Trace: c018a49a <invert_screen+156/164>
Trace: c018f7c9 <set_selection+519/628>
Trace: c012001c <unuse_vma+38/1b4>
Trace: c018e365 <tioclinux+ad/15c>
Trace: c0192cdf <tty_ioctl+39b/444>
Code: c01a8d6f <fbcon_cfb8_putcs+1af/2d0> 00000000 <_EIP>: <===
Code: c01a8d6f <fbcon_cfb8_putcs+1af/2d0> 0: 89 06
movl %eax,(%esi) <===
Code: c01a8d71 <fbcon_cfb8_putcs+1b1/2d0> 2: 8a 03
movb (%ebx),%al
Code: c01a8d73 <fbcon_cfb8_putcs+1b3/2d0> 4: 83 e0 0f
andl $0xf,%eax
Code: c01a8d76 <fbcon_cfb8_putcs+1b6/2d0> 7: 8b 7c 24 18
movl 0x18(%esp,1),%edi
Code: c01a8d7a <fbcon_cfb8_putcs+1ba/2d0> b: 23 3c 85 58
cd andl 0xc01dcd58(,%eax,4),%edi
Code: c01a8d7f <fbcon_cfb8_putcs+1bf/2d0> 10: 1d c0
Code: c01a8d81 <fbcon_cfb8_putcs+1c1/2d0> 12: 89 f8
movl %edi,%eax
2 warnings issued. Results may not be reliable.

thanks,

Brad Bailey

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