Hi All,
I am trying to put kernel thread to sleep via
interruptible_sleep_on_timeout(). Body of kernel
thread function is as follows
static int print_taskinfo(void * data)
{
wait_queue_head_t wait;
init_waitqueue_head (&wait);
for (;;)
{
// do something useful here.
interruptible_sleep_on_timeout(&wait, HZ);
//check whether we have to break loop or
continue.
}
}
I am facing following kernel oops :
Unable to handle kernel NULL pointer dereference at
virtual address 00000005
printing eip:
c011905d
*pde = 00000000
Oops: 0002
CPU: 0
EIP: 0060:[<c011905d>] Tainted: PF
EFLAGS: 00010086
EIP is at interruptible_sleep_on_timeout [kernel] 0x2d
(2.4.20-6)
eax: c2cadfc4 ebx: 00000286 ecx: c2cadfac edx:
00000001
esi: 00000064 edi: c8dc7540 ebp: c2cadfbc esp:
c2cadfa4
ds: 0068 es: 0068 ss: 0068
Process insmod (pid: 3884, stackpage=c2cad000)
Stack: 00000000 c2cac000 00000f2b 00000000 c034c000
c8dc74c0 c2cadfec d087d1a1
00000001 c2cadfc8 c2cadfc8 00000000 00000000
00000000 00000000 d087d074
00000000 00000000 00000000 c010742d 00000000
00000000 00000000
Call Trace: [<d087d1a1>] print_taskinfo [hello1]
0x12d (0xc2cadfc0))
[<d087d074>] print_taskinfo [hello1] 0x0 (0xc2cadfe0))
[<c010742d>] kernel_thread_helper [kernel] 0x5
(0xc2cadff0))
Code: 89 4a 04 89 55 f0 89 45 f4 89 08 89 f0 e8 d1 ca
00 00 89 c6
general protection fault: 0000
hello1 fealnx mii ide-cd cdrom soundcore mousedev
input parport_pc lp parport autofs ipt_REJECT
iptable_filter ip_tables ext3 jbd
CPU: 0
EIP: 0060:[<c011b416>] Tainted: PF
EFLAGS: 00210216
EIP is at __mmdrop [kernel] 0x126 (2.4.20-6)
eax: 00000000 ebx: ffffffff ecx: 000001ac edx:
ffffffff
esi: c2020000 edi: ffffffff ebp: 00000000 esp:
c2021efc
ds: 0068 es: 0068 ss: 0068
Process bash (pid: 3840, stackpage=c2021000)
Stack: ffffffff 00000011 00000011 c011a170 ffffffff
c2020000 000006b0 c2020000
c011a8f7 c2020000 c015b890 c1b04244 000001f0
c2021f54 c47a1480 fffffff4
c47a1480 c47a1480 c01519d5 00000004 c2020000
00000011 00000000 bfffe2c8
Call Trace: [<c011a170>] dup_task_struct [kernel]
0x30 (0xc2021f08))
[<c011a8f7>] copy_process [kernel] 0x87 (0xc2021f1c))
[<c015b890>] d_alloc [kernel] 0x20 (0xc2021f24))
[<c01519d5>] do_pipe [kernel] 0x185 (0xc2021f44))
[<c011b1fe>] do_fork [kernel] 0x4e (0xc2021f5c))
[<c0107ad7>] sys_fork [kernel] 0x37 (0xc2021fa4))
[<c0109537>] system_call [kernel] 0x33 (0xc2021fc0))
Code: f3 a5 e9 53 ff ff ff 8d 76 00 c1 e9 02 89 d7 f3
a5 a4 e9 43
Can anyone guide me where I am going wrong?
Regards
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