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SubjectRe: problem rmmod'ing module
On Wed, Feb 18, 2004 at 03:06:21PM +1100, Keith Owens wrote:
> On Tue, 17 Feb 2004 15:38:58 -0600,
> Matthew Rench <lists@pelennor.net> wrote:
> >When I strace rmmod, the last few lines are:
> >
> > query_module(NULL, QM_MODULES, { /* 5 entries */ }, 5) = 0
> > query_module("serial", QM_INFO, {address=0xd8816000, size=43620, flags=MOD_RUNNING, usecount=14}, 16) = 0
> > query_module( <unfinished ...>
> > +++ killed by SIGSEGV +++
>
> Information about the second module in the chain (after "serial") is
> corrupt. What does lsmod report?

lsmod reports:

Module Size Used by
serial 43620 16 (unused)
loop 8600 6 (autoclean)
ide-scsi 8984 0
parport_pc 15604 0 (autoclean)
parport 13760 0 (autoclean) [parport_pc]

> You should have several oops reports in your syslog. Run the first two
> through ksymoops and send in the ksymoops output.

The first several oops have identical reports from ksymoops, so I'm just
including the first one below. One unusual thing I noticed from running
ksymoops is that serial.o doesn't appear to have any symbols. Very odd. I
take it this isn't normal?

By the way, I don't suppose there's any way to clean this up without
rebooting, is there?

Thanks for the help,
mdr


mdr@aragorn: ksymoops -k 20040217120634.ksyms -l 20040217120634.modules oops.1
ksymoops 2.4.9 on i686 2.4.21. Options used
-V (default)
-k 20040217120634.ksyms (specified)
-l 20040217120634.modules (specified)
-o /lib/modules/2.4.21/ (default)
-m /usr/src/linux/System.map (default)

/usr/bin/nm: /lib/modules/2.4.21/kernel/drivers/char/serial.o: no symbols
Warning (read_object): no symbols in /lib/modules/2.4.21/kernel/drivers/char/serial.o
Warning (compare_maps): serial symbol <NULL> not found in /lib/modules/2.4.21/kernel/drivers/char/serial.o. Ignoring /lib/modules/2.4.21/kernel/drivers/char/serial.o entry
Feb 17 13:56:35 aragorn kernel: <1>Unable to handle kernel NULL pointer derefer
ence at virtual address 00000000
Feb 17 13:56:35 aragorn kernel: c0118b7e
Feb 17 13:56:35 aragorn kernel: *pde = 00000000
Feb 17 13:56:35 aragorn kernel: Oops: 0000
Feb 17 13:56:35 aragorn kernel: CPU: 0
Feb 17 13:56:35 aragorn kernel: EIP: 0010:[qm_symbols+194/500] Not tainted
Feb 17 13:56:35 aragorn kernel: EFLAGS: 00010246
Feb 17 13:56:35 aragorn kernel: eax: 00000000 ebx: 00000000 ecx: ffffffff
edx: 00000000
Feb 17 13:56:35 aragorn kernel: esi: 00000048 edi: 00000000 ebp: d881bc24
esp: cb3dbf7c
Feb 17 13:56:35 aragorn kernel: ds: 0018 es: 0018 ss: 0018
Feb 17 13:56:35 aragorn kernel: Process depmod (pid: 10011, stackpage=cb3db000)
Feb 17 13:56:35 aragorn kernel: Stack: fffffffe d8816000 c46e1000 bfff4988 00000
009 08071780 080717c8 00000000
Feb 17 13:56:35 aragorn kernel: c0118ed7 d8816000 08071780 000003b8 bfff4
988 cb3da000 00000400 bfff4988
Feb 17 13:56:35 aragorn kernel: bfff492c c0106f9b 080711f8 00000004 08071
780 00000400 bfff4988 bfff492c
Feb 17 13:56:35 aragorn kernel: Call Trace: [sys_query_module+327/420] [trace
sys+31/35]
Feb 17 13:56:35 aragorn kernel: Code: f2 ae f7 d1 49 8d 59 01 3b 5c 24 2c 0f 87
98 00 00 00 53 52
Using defaults from ksymoops -t elf32-i386 -a i386


>>ebp; d881bc24 <[serial].rodata.end+253/2af>
>>esp; cb3dbf7c <_end+b0cb0f8/185051dc>

Code; 00000000 Before first symbol
00000000 <_EIP>:
Code; 00000000 Before first symbol
0: f2 ae repnz scas %es:(%edi),%al
Code; 00000002 Before first symbol
2: f7 d1 not %ecx
Code; 00000004 Before first symbol
4: 49 dec %ecx
Code; 00000005 Before first symbol
5: 8d 59 01 lea 0x1(%ecx),%ebx
Code; 00000008 Before first symbol
8: 3b 5c 24 2c cmp 0x2c(%esp,1),%ebx
Code; 0000000c Before first symbol
c: 0f 87 98 00 00 00 ja aa <_EIP+0xaa> 000000aa Before first sy
mbol
Code; 00000012 Before first symbol
12: 53 push %ebx
Code; 00000013 Before first symbol
13: 52 push %edx


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