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From: Stefan Agner on 12 Apr 2010 12:40
Unable to handle kernel paging request at kthread_should_stop

Hello,

In a kernel module which used to work on previous kernel versions I tried to
start a kernel thread (kthread). In the threads mainloop I poll the method
kthread_should_stop which seems to fail.

[ 65.531778] BUG: unable to handle kernel paging request at fffffffc
[ 65.532011] IP: [<c103bf7c>] kthread_should_stop+0x10/0x14
[ 65.532011] *pde = 01551067 *pte = 00000000
[ 65.532011] Oops: 0000 [#1] SMP
[ 65.532011] last sysfs file: /sys/devices/virtual/dmi/id/board_asset_tag
[ 65.532011] Modules linked in: testmod [last unloaded: scsi_wait_scan]
[ 65.532011]
[ 65.532011] Pid: 3392, comm: test-module Not tainted 2.6.33.2-rt13 #1 E243/
E243
[ 65.532011] EIP: 0060:[<c103bf7c>] EFLAGS: 00010206 CPU: 0
[ 65.532011] EIP is at kthread_should_stop+0x10/0x14
[ 65.532011] EAX: 00000000 EBX: dd9e8430 ECX: 00006161 EDX: 00000286
[ 65.532011] ESI: 00000000 EDI: e00d8000 EBP: dc8e1fbc ESP: dc8e1fb0
[ 65.532011] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 preempt:0000000
0
[ 65.532011] Process test-module (pid: 3392, ti=dc8e0000 task=dd9e8430
task.ti=dc8e0000)
[ 65.535828] Stack:
[ 65.535828] e00d808c 00000000 d3945f50 dc8e1fe4 c103bfe1 00000000 00000001
00000101
[ 65.535828] <0> dc8e1fd0 dc8e1fd0 00000000 c103bf80 d3945f44 00000000
c1002e36 00000000
[ 65.535828] <0> 00000000 00000000 00000000 00000000
[ 65.535828] Call Trace:
[ 65.535828] [<e00d808c>] ? runloop+0x8c/0xa4 [testmod]
[ 65.535828] [<c103bfe1>] ? kthread+0x61/0x66
[ 65.535828] [<c103bf80>] ? kthread+0x0/0x66
[ 65.535828] [<c1002e36>] ? kernel_thread_helper+0x6/0x10
[ 65.535828] Code: 8b 47 18 01 46 10 8b 55 f0 8d 47 08 e8 b1 a9 32
00 8d 65 f4
5b 5e 5f 5d c3 90 90 55 64 a1 7c 34 54 c1 8b 80 8c 01 00 00 89 e5 5d
<8b> 40 fc
c3 55 ba a4 f6 59 c1 89 e5 57 56 53 89 c3 83 ec 14 8b
[ 65.535828] EIP: [<c103bf7c>] kthread_should_stop+0x10/0x14 SS:ESP
0068:dc8e1fb0
[ 65.535828] CR2: 00000000fffffffc
[ 65.535828] ---[ end trace 6b0fc9b05d23e589 ]---

My platform is an Intel Atom CPU N270.
# uname -a
Linux systemmanager 2.6.33.2-rt13 #1 SMP Sat Apr 10 00:12:20 CEST 2010 i686
GNU/Linux

I attached a test module to reproduce this bug. Does I miss something in my
code or is there a bug?

Thanks for any help

--
Stefan Agner


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