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POLINUX kill_pid fails
 

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    <p>I introduce my self in the driver programming via a book.</p> <p>This book is about Linux-driver programming with a 2.6 Kernel. But now I met a problem. I copied the following code from the book. And tried to understand it. So far, so good. </p> <pre><code>#include &lt;linux/module.h&gt; #include &lt;linux/version.h&gt; #include &lt;linux/init.h&gt; #include &lt;linux/completion.h&gt; static int thread_id=0; static wait_queue_head_t wq; static DECLARE_COMPLETION( on_exit ); static int thread_code( void *data ) { unsigned long timeout; int i; daemonize("MyKThread"); allow_signal( SIGTERM ); for( i=0; i&lt;10; i++ ) { timeout=HZ; // wait 1 second timeout=wait_event_interruptible_timeout( wq, (timeout==0), timeout); printk("thread_code: woke up ...\n"); if( timeout==-ERESTARTSYS ) { printk("got signal, break\n"); break; } } thread_id = 0; complete_and_exit( &amp;on_exit, 0 ); } static int __init kthread_init(void) { init_waitqueue_head(&amp;wq); thread_id=kernel_thread(thread_code, NULL, CLONE_KERNEL ); printk("thread_id %u",thread_id); if( thread_id==0 ) return -EIO; return 0; } static void __exit kthread_exit(void) { printk("thread_code: exit ...\n"); printk("thread_id %u\n",thread_id); if( thread_id ) { kill_pid( thread_id, SIGTERM, 1 );//kill_proc --&gt; kill_pid } wait_for_completion( &amp;on_exit ); } module_init( kthread_init ); module_exit( kthread_exit ); MODULE_LICENSE("GPL"); </code></pre> <p>At first I replaced kill_proc with kill_pid.</p> <p>But if I run the programm and tip rmmod ... I get this message:</p> <pre><code>thread_code: exit ... thread_id 995 Unable to handle kernel paging request for data at address 0x000003eb Faulting instruction address: 0xc0047998 Oops: Kernel access of bad area, sig: 11 [#1] SBC8548 last sysfs file: Modules linked in: bsp_6_9(-) NIP: c0047998 LR: c0040540 CTR: c0040578 REGS: cf987de0 TRAP: 0300 Not tainted (2.6.36) MSR: 00029000 &lt;EE,ME,CE&gt; CR: 40000424 XER: 00000000 DEAR: 000003eb, ESR: 00000000 TASK = cf9fcdb0[997] 'rmmod' THREAD: cf986000 GPR00: 00000000 cf987e90 cf9fcdb0 000003e3 00000000 000003e3 c015b6c8 000023fc GPR08: 00000034 000003e3 000023fc c0040578 20000422 1004a180 00000240 00000000 GPR16: 101042f0 1009ea94 100f0000 10043008 00000000 bf91a110 10001bcc bf91a11c GPR24: bf91a118 00000000 c02cca7c c02cca88 0000000f 00000001 000003e3 fffffffd NIP [c0047998] pid_task+0x18/0x38 LR [c0040540] kill_pid_info+0x2c/0x64 Call Trace: [cf987e90] [c015b6c8] serial8250_console_putchar+0x0/0x4c (unreliable) [cf987eb0] [d102a16c] kthread_exit+0x50/0x124 [bsp_6_9] [cf987ed0] [c006026c] sys_delete_module+0x174/0x210 [cf987f40] [c000dae0] ret_from_syscall+0x0/0x3c --- Exception: c01 at 0xff3b2bc LR = 0x10000f80 Instruction dump: 8127000c 90890004 3c000020 60000200 90030010 4e800020 2c030000 4082000c 38600000 4e800020 5480103a 7d230214 &lt;80690008&gt; 2f830000 41beffe8 54892036 ---[ end trace d2ac023715aedf88 ]--- Segmentation fault -bash-3.2# Message from syslogd@ at Thu Jan 1 01:00:10 1970 ... MPC_Embedded_Linux kernel: last sysfs file: thread_code: woke up ... </code></pre> <p>Maybe the send kill_pid sequence is not right, but I found no solution.</p> <p>Thanks for the Help</p> <p>Peter</p>
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