[Linux-ia64] unregister_rebbot_notifier()

[Linux-ia64] unregister_rebbot_notifier()

[Randall G Chan/Fremont/IBM]

Below is a small snippet of code that will make the kernel hang on a
reboot.  It hangs in the call to unregister_reboot_notifier() [on a reboot
when the module is loaded].  It seems that it hangs in this function while
trying to call write_lock(&notifier_lock).  Looks like something that
grabbed the long before never set the lock back to unlocked.  I've tried
this on 2.4.0-test7 on  a BigSur A3, 1 GB mem, BIOS 70 and a Lion B0, 1 GB
mem, BIOS 55.  This code works fine if you remove the module (rmmod), but
if you insert it and reboot the machine using reboot, shutdown,
three-finger-salute, it'll hang.

Also, I can't seem to get this module to load on 2.4.0-test8.  This system
just seems to hang after trying to insert the module.  I've seen this
happen on the same two machines listed above.  Are there any known problems
in test8 in relation to module loading?

Thanks,
Randy Chan
chanr@us.ibm.com

--------------------------------------------------------------------------

#define MODULE
#define __KERNEL__
#include <linux/version.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/notifier.h>

static int mod_finalize(struct notifier_block *, unsigned long, void *);
static struct notifier_block NBlk = { mod_finalize, NULL, 0 };

int init_module(void)
{
    printk("<1>Inserted!\n");
    register_reboot_notifier(&NBlk);
    return 0;
}

void cleanup_module(void)
{
    mod_finalize(&NBlk, SYS_RESTART, NULL);
    printk("<1>Removed!\n");
}

static int mod_finalize(struct notifier_block *nb, unsigned long event,
void *buf)
{
    printk("Finalizing!\n");
    unregister_reboot_notifier(&NBlk);
}

Re: [Linux-ia64] unregister_rebbot_notifier()

[Keith Owens]

On Thu, 21 Sep 2000 14:03:51 -0700, 
"Randall G Chan/Fremont/IBM" <chanr@us.ibm.com> wrote:
>Also, I can't seem to get this module to load on 2.4.0-test8.  This system
>just seems to hang after trying to insert the module.  I've seen this
>happen on the same two machines listed above.  Are there any known problems
>in test8 in relation to module loading?

Probably a mismatch between kernel code and modutils.  What does this
report?

grep -B 5 -A 5 module_arch_init kernel/module.c
/sbin/depmod --version

Re: [Linux-ia64] unregister_rebbot_notifier()

[Keith Owens]

On Thu, 21 Sep 2000 14:03:51 -0700, 
"Randall G Chan/Fremont/IBM" <chanr@us.ibm.com> wrote:
>Also, I can't seem to get this module to load on 2.4.0-test8.  This system
>just seems to hang after trying to insert the module.  I've seen this
>happen on the same two machines listed above.  Are there any known problems
>in test8 in relation to module loading?

Please try modutils 2.3.16 plus the patch at
ftp://ftp.ocs.com.au/private/modutils-2.3.16-patch-1, let me know if it
works so I can release it as modutils 2.3.17.

Re: [Linux-ia64] unregister_rebbot_notifier()

[Randall G Chan/Fremont/IBM]

I didn't test it extensively, but I inserted a couple of modules and
everything seem to be okay.  And my problem was that I did have a mismatch
btwn modutils and the kernel.

Thanks,
Randy Chan
chanr@us.ibm.com

--------------------------------------------------------------------------


                                                                                                                                
                    Keith Owens                                                                                                 
                    <kaos@ocs.com.au>           To:     linux-ia64@linuxia64.org                                                
                    Sent by:                    cc:     Randall G Chan/Fremont/IBM@IBMUS                                        
                    linux-ia64-admin@lin        Subject:     Re: [Linux-ia64] unregister_rebbot_notifier()                      
                    uxia64.org                                                                                                  
                                                                                                                                
                                                                                                                                
                    09/21/00 04:44 PM                                                                                           
                                                                                                                                
                                                                                                                                




On Thu, 21 Sep 2000 14:03:51 -0700,
"Randall G Chan/Fremont/IBM" <chanr@us.ibm.com> wrote:
>Also, I can't seem to get this module to load on 2.4.0-test8.  This system
>just seems to hang after trying to insert the module.  I've seen this
>happen on the same two machines listed above.  Are there any known
problems
>in test8 in relation to module loading?

Please try modutils 2.3.16 plus the patch at
ftp://ftp.ocs.com.au/private/modutils-2.3.16-patch-1, let me know if it
works so I can release it as modutils 2.3.17.


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