Re: [BUG]: 2.4.10 lockup using ppp on SMP

From: Till Immanuel Patzschke (
Date: Fri Sep 28 2001 - 12:10:04 EST

Oops, forgot to tell - Chris Mason's patch has been applied (so NO change).
The problem seems somhow related to the general kernel lock in ioctls - to prove I
commented the unlock_kernel()/lock_kernel() in sock_ioctl out, leaving the kernel
locked during socket ioctls - bad, but proves ioctl related locking problem in
ppp_generic.c... The problem has nothing to do w/ double frees or mem. corruption
(IMO) - it seems to be related to "rest of the spin lock abuses" in ppp_generic.c...

Thanks for your help

Kurt Garloff wrote:

> On Fri, Sep 28, 2001 at 05:03:06PM +0200, Till Immanuel Patzschke wrote:
> > Hi,
> >
> > 2.4.10 (and all its 2.4.x predecessors) lock up in ppp_destroy_interface. Thanks
> > to the kdb I got the two tracebacks below - the all_ppp_lock interferes with
> > some other (socket?!) lock...
> > Any help is VERY much appreciated!
> Please try the patch that Chris Mason sent to LKML a day ago.
> Regards,
> --
> Kurt Garloff <> Eindhoven, NL
> GPG key: See mail header, key servers Linux kernel development
> SuSE GmbH, Nuernberg, DE SCSI, Security
> --------------------------------------------------------------------------------
> Part 1.2Type: application/pgp-signature

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