2.4.5+ hangs on boot

2.4.5+ hangs on boot

[David Ford]

Ok, aic7xxx hang solved on one machine with APIC solution
Ok, sched.c hang solved on another machine with patch.

However that patch doesn't solve everything and there are a few other 
places where things hang.

*) I20 hangs in the middle of I20 init on -every- system I have from 586 
to pIII in recent kernels
*) something hangs just after floppy init, last line is FDC0...

The FDC is immediately prior to where I2O inits so possibly the hang is 
actually just following FDC/I2O?  Normal boot messages should be like this:

Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
Loading I2O Core - (c) Copyright 1999 Red Hat Software
Linux I2O PCI support (c) 1999 Red Hat Software.
i2o: Checking for PCI I2O controllers...
I2O configuration manager v 0.04.
  (C) Copyright 1999 Red Hat Software
I2O Block Storage OSM v0.9
   (c) Copyright 1999-2001 Red Hat Software.
i2o_block: Checking for Boot device...
i2o_block: Checking for I2O Block devices...
I2O LAN OSM (C) 1999 University of Helsinki.
early initialization of device teql0 is deferred
loop: loaded (max 8 devices)
Linux Tulip driver version 0.9.15-pre3 (June 1, 2001)
PCI: Found IRQ 5 for device 00:10.0

Any comments or suggestions?  2.4.5-ac19 is the last kernel I have that 
works.

David

[found-not fixed] Re: 2.4.5+ hangs on boot

[David Ford]

Ok, the problem is this.  I have TEQL packet scheduling in my config, 
the kernel runs through this sequence on boot:

net_dev_init()
    pktsched_init()
        teql_init()    [starts a lock with rtnl_lock()]
            register_netdevice()
                net_dev_init()
                    pktsched_init()
                        teql_init() [hangs here...]

Here is the problem.  We enter teql_init() again with a rtnl_lock() 
already being held.  Do any of the authors of these functions want to 
jump in here?

David

David Ford wrote:

> [...]
> I2O LAN OSM (C) 1999 University of Helsinki.
> early initialization of device teql0 is deferred
> loop: loaded (max 8 devices)
> Linux Tulip driver version 0.9.15-pre3 (June 1, 2001)
> PCI: Found IRQ 5 for device 00:10.0
>
> Any comments or suggestions?  2.4.5-ac19 is the last kernel I have 
> that works.

[PATCH] Re: 2.4.5+ hangs on boot

[David Ford]

[-- Attachment #1: Type: text/plain, Size: 1518 bytes --]

Ok, since net_dev_init() is called from genhd.c:53, I figured it'd work 
just fine if I removed it from net/core/dev.c in register_netdev(). 
 Since I'm not as well steeped in this code, those who know better are 
invited to correct me.

--- linux-2.4.6.orig/net/core/dev.c     Sat Jul 14 17:48:57 2001
+++ linux-2.4.6/net/core/dev.c  Wed Jun 20 21:00:55 2001
@@ -2405,6 +2401,9 @@
 #ifdef CONFIG_NET_FASTROUTE
        dev->fastpath_lock=RW_LOCK_UNLOCKED;
 #endif
-
-       if (dev_boot_phase)
-               net_dev_init();
 
 #ifdef CONFIG_NET_DIVERT
        ret = alloc_divert_blk(dev);

David

David Ford wrote:

> Ok, the problem is this.  I have TEQL packet scheduling in my config, 
> the kernel runs through this sequence on boot:
>
> net_dev_init()
>    pktsched_init()
>        teql_init()    [starts a lock with rtnl_lock()]
>            register_netdevice()
>                net_dev_init()
>                    pktsched_init()
>                        teql_init() [hangs here...]
>
> Here is the problem.  We enter teql_init() again with a rtnl_lock() 
> already being held.  Do any of the authors of these functions want to 
> jump in here?
>
> David
>
> David Ford wrote:
>
>> [...]
>> I2O LAN OSM (C) 1999 University of Helsinki.
>> early initialization of device teql0 is deferred
>> loop: loaded (max 8 devices)
>> Linux Tulip driver version 0.9.15-pre3 (June 1, 2001)
>> PCI: Found IRQ 5 for device 00:10.0
>>
>> Any comments or suggestions?  2.4.5-ac19 is the last kernel I have 
>> that works.
>


[-- Attachment #2: dev.c-diff --]
[-- Type: text/plain, Size: 317 bytes --]

--- linux-2.4.6.orig/net/core/dev.c	Sat Jul 14 17:48:57 2001
+++ linux-2.4.6/net/core/dev.c	Wed Jun 20 21:00:55 2001
@@ -2405,6 +2401,9 @@
 #ifdef CONFIG_NET_FASTROUTE
 	dev->fastpath_lock=RW_LOCK_UNLOCKED;
 #endif
-
-	if (dev_boot_phase)
-		net_dev_init();
 
 #ifdef CONFIG_NET_DIVERT
 	ret = alloc_divert_blk(dev);