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[linux-dvb] Oops when removing a dvbnet
Hello
With dvbnet I have setup five networks. When I want to remove them I get
an oops while removing the second interface:
/usr/sbin/dvbnet -d dvb0_4
DVB Network Interface Manager
Version 1.1.0-TVF (Build Wed Nov 24 09:55:56 AM 2004)
Copyright (C) 2003, TV Files S.p.A
Device: /dev/dvb/adapter0/net0
Status: device 0 removed successfully.
This one is removed without problems, but the second one goes as follows:
/usr/sbin/dvbnet -d dvb0_3
DVB Network Interface Manager
Version 1.1.0-TVF (Build Wed Nov 24 09:55:56 AM 2004)
Copyright (C) 2003, TV Files S.p.A
Device: /dev/dvb/adapter0/net0
Segmentation fault
In /var/log/messages there is this oops:
Unable to handle kernel NULL pointer dereference at virtual address 00000068
printing eip:
f98a331f
*pde = 00000000
Oops: 0000 [#1]
SMP
Modules linked in: stv0299 w83627hf i2c_sensor i2c_isa ip_conntrack iptable_filter ip_tables binfmt_misc uhci_hcd ehci_hcd usbcore skystar2 dvb_core floppy ide_cd cdrom
CPU: 1
EIP: 0060:[<f98a331f>] Not tainted VLI
EFLAGS: 00010246 (2.6.10-rc2)
EIP is at dvb_net_remove_if+0x16/0x53 [dvb_core]
eax: ffffffea ebx: 00000000 ecx: 00000000 edx: 00000000
esi: 00000000 edi: f78ea470 ebp: 00000000 esp: d0f3eee0
ds: 007b es: 007b ss: 0068
Process dvbnet (pid: 8807, threadinfo=d0f3e000 task=d1f71a20)
Stack: 00006f35 f98ac460 00000000 f9899645 00000000 d18e2e80 f7730bb4 00000000
00000000 00684330 00000004 d0f3efc4 d0f3efc4 c02d0b49 00000004 0000000e
0000000b 00000000 f989905f c01562dd d18e2e80 c014f5d5 00030002 f7730bb4
Call Trace:
[<f9899645>] dvb_usercopy+0x93/0xfa [dvb_core]
[<f989905f>] dvb_device_open+0x0/0x13d [dvb_core]
[<c01562dd>] chrdev_open+0xad/0x15e
[<c014f5d5>] get_empty_filp+0x52/0xc9
[<c014df0b>] dentry_open+0xaf/0x1d7
[<c014de56>] filp_open+0x40/0x46
[<c017399a>] dnotify_parent+0x1f/0x75
[<f98a3585>] dvb_net_ioctl+0x18/0x1d [dvb_core]
[<f98a335c>] dvb_net_do_ioctl+0x0/0x211 [dvb_core]
[<c015e13f>] sys_ioctl+0x1d0/0x22d
[<c0102cf1>] sysenter_past_esp+0x52/0x71
Code: 5d c3 89 d8 c7 44 af 04 00 00 00 00 e8 ef 7f 9d c6 89 f0 eb e5 57 89 c7 56 53 89 d3 8b 4c 9f 2c 8b 74 90 04 b8 ea ff ff ff 85 c9 <8b> 56 68 74 34 8b 12 b0 f0 85 d2 75 2c 89 f0 e8 69 fd ff ff e8
Trying to remove a third interface gives the following:
/usr/sbin/dvbnet -d dvb0_2
DVB Network Interface Manager
Version 1.1.0-TVF (Build Wed Nov 24 09:55:56 AM 2004)
Copyright (C) 2003, TV Files S.p.A
Device: /dev/dvb/adapter0/net0
Error: couldn't open device /dev/dvb/adapter0/net0: 16 Device or resource busy
Kernel is 2.6.10-rc2 with cset-20041123_0604.txt applied. The system is a
P4 with HT enabled and a skystar2 (think it is version 2.6C).
I have noticed this behaviour also happen with other kernels, down to
2.4.x.
Attached is the output from ksymoops. Please tell me if I forgot
anything.
Regards,
Holger (Kiehl)
--
ksymoops 2.4.9 on i686 2.6.10-rc2. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.6.10-rc2/ (default)
-m /usr/src/linux/System.map (default)
Warning: You did not tell me where to find symbol information. I will
assume that the log matches the kernel and modules that are running
right now and I'll use the default options above for symbol resolution.
If the current kernel and/or modules do not match the log, you can get
more accurate output by telling me the kernel version and where to find
map, modules, ksyms etc. ksymoops -h explains the options.
Error (regular_file): read_ksyms stat /proc/ksyms failed
No modules in ksyms, skipping objects
No ksyms, skipping lsmod
Error (regular_file): read_system_map stat /usr/src/linux/System.map failed
Warning (merge_maps): no symbols in merged map
Unable to handle kernel NULL pointer dereference at virtual address 00000068
f98a331f
*pde = 00000000
Oops: 0000 [#1]
CPU: 1
EIP: 0060:[<f98a331f>] Not tainted VLI
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246 (2.6.10-rc2)
eax: ffffffea ebx: 00000000 ecx: 00000000 edx: 00000000
esi: 00000000 edi: f78ea470 ebp: 00000000 esp: d0f3eee0
ds: 007b es: 007b ss: 0068
Stack: 00006f35 f98ac460 00000000 f9899645 00000000 d18e2e80 f7730bb4 00000000
00000000 00684330 00000004 d0f3efc4 d0f3efc4 c02d0b49 00000004 0000000e
0000000b 00000000 f989905f c01562dd d18e2e80 c014f5d5 00030002 f7730bb4
Call Trace:
[<f9899645>] dvb_usercopy+0x93/0xfa [dvb_core]
[<f989905f>] dvb_device_open+0x0/0x13d [dvb_core]
[<c01562dd>] chrdev_open+0xad/0x15e
[<c014f5d5>] get_empty_filp+0x52/0xc9
[<c014df0b>] dentry_open+0xaf/0x1d7
[<c014de56>] filp_open+0x40/0x46
[<c017399a>] dnotify_parent+0x1f/0x75
[<f98a3585>] dvb_net_ioctl+0x18/0x1d [dvb_core]
[<f98a335c>] dvb_net_do_ioctl+0x0/0x211 [dvb_core]
[<c015e13f>] sys_ioctl+0x1d0/0x22d
[<c0102cf1>] sysenter_past_esp+0x52/0x71
Code: 5d c3 89 d8 c7 44 af 04 00 00 00 00 e8 ef 7f 9d c6 89 f0 eb e5 57 89 c7 56 53 89 d3 8b 4c 9f 2c 8b 74 90 04 b8 ea ff ff ff 85 c9 <8b> 56 68 74 34 8b 12 b0 f0 85 d2 75 2c 89 f0 e8 69 fd ff ff e8
>>EIP; f98a331f No symbols available <=====
Trace; f9899645 No symbols available
Trace; f989905f No symbols available
Trace; c01562dd No symbols available
Trace; c014f5d5 No symbols available
Trace; c014df0b No symbols available
Trace; c014de56 No symbols available
Trace; c017399a No symbols available
Trace; f98a3585 No symbols available
Trace; f98a335c No symbols available
Trace; c015e13f No symbols available
Trace; c0102cf1 No symbols available
This architecture has variable length instructions, decoding before eip
is unreliable, take these instructions with a pinch of salt.
Code; f98a32f4 No symbols available
00000000 <_EIP>:
Code; f98a32f4 No symbols available
0: 5d pop %ebp
Code; f98a32f5 No symbols available
1: c3 ret
Code; f98a32f6 No symbols available
2: 89 d8 mov %ebx,%eax
Code; f98a32f8 No symbols available
4: c7 44 af 04 00 00 00 movl $0x0,0x4(%edi,%ebp,4)
Code; f98a32ff No symbols available
b: 00
Code; f98a3300 No symbols available
c: e8 ef 7f 9d c6 call c69d8000 <_EIP+0xc69d8000>
Code; f98a3305 No symbols available
11: 89 f0 mov %esi,%eax
Code; f98a3307 No symbols available
13: eb e5 jmp fffffffa <_EIP+0xfffffffa>
Code; f98a3309 No symbols available
15: 57 push %edi
Code; f98a330a No symbols available
16: 89 c7 mov %eax,%edi
Code; f98a330c No symbols available
18: 56 push %esi
Code; f98a330d No symbols available
19: 53 push %ebx
Code; f98a330e No symbols available
1a: 89 d3 mov %edx,%ebx
Code; f98a3310 No symbols available
1c: 8b 4c 9f 2c mov 0x2c(%edi,%ebx,4),%ecx
Code; f98a3314 No symbols available
20: 8b 74 90 04 mov 0x4(%eax,%edx,4),%esi
Code; f98a3318 No symbols available
24: b8 ea ff ff ff mov $0xffffffea,%eax
Code; f98a331d No symbols available
29: 85 c9 test %ecx,%ecx
This decode from eip onwards should be reliable
Code; f98a331f No symbols available
00000000 <_EIP>:
Code; f98a331f No symbols available <=====
0: 8b 56 68 mov 0x68(%esi),%edx <=====
Code; f98a3322 No symbols available
3: 74 34 je 39 <_EIP+0x39>
Code; f98a3324 No symbols available
5: 8b 12 mov (%edx),%edx
Code; f98a3326 No symbols available
7: b0 f0 mov $0xf0,%al
Code; f98a3328 No symbols available
9: 85 d2 test %edx,%edx
Code; f98a332a No symbols available
b: 75 2c jne 39 <_EIP+0x39>
Code; f98a332c No symbols available
d: 89 f0 mov %esi,%eax
Code; f98a332e No symbols available
f: e8 69 fd ff ff call fffffd7d <_EIP+0xfffffd7d>
Code; f98a3333 No symbols available
14: e8 .byte 0xe8
2 warnings and 2 errors issued. Results may not be reliable.
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