(switch to email - please retain all ccs) On Sun, 29 Apr 2007 13:01:25 -0700 [EMAIL PROTECTED] wrote:
> http://bugzilla.kernel.org/show_bug.cgi?id=8405 > > Summary: pppd does stops compresion with "Lost compression sync" > Kernel Version: 2.6.18-2.6.21 > Status: NEW > Severity: normal > Owner: [EMAIL PROTECTED] > Submitter: [EMAIL PROTECTED] > > > Most recent kernel where this bug did *NOT* occur:2.6.17 > Distribution: Fedora core 3 > Hardware Environment: > Software Environment: > Problem Description: > I have the same problem as reported on > http://www.luga.at/mailing-lists/luga/2007/02/msg00032.html (in German). > When I connect to my ISP via an analogue serial modem my Linux Box sends a PPP > Compression Control Protocol Termination Request with "Lost compression sync" > to the provider and then the provider dropps the link. This does not happen > with > kernel > 2.6.17, but happens from kernel version 2.6.18 to 2.6.21 (not tested: 2.6.19). > If I put the nodeflate command line to the pppd then the link remains stable. > Steps to reproduce: > In order to find out what is happening I have set up a ppp connection via a > serial nullmodem to another old Linux box (kernel 2.2.14) and have activated > the > kernel debug in the ppp_deflate.ko module. The "Lost compression sync:" is > reproducable in this configuration - the only difference is that the link > remains (without deflate compression). > > Here is the log vor /var/log/messages: > > Apr 29 16:53:34 linux kernel: PPP Deflate Compression module registered > Apr 29 16:53:47 linux pppd[9090]: pppd 2.4.4 started by root, uid 0 > Apr 29 16:53:47 linux pppd[9090]: Using interface ppp0 > Apr 29 16:53:47 linux pppd[9090]: Connect: ppp0 <--> /dev/pts/9 > Apr 29 16:53:47 linux pppd[9090]: kernel does not support PPP filtering > Apr 29 16:53:47 linux pppd[9090]: Deflate (15) compression enabled > Apr 29 16:53:47 linux pppd[9090]: Cannot determine ethernet address for proxy > ARP > Apr 29 16:53:47 linux pppd[9090]: local IP address 192.168.3.2 > Apr 29 16:53:47 linux pppd[9090]: remote IP address 192.168.3.1 > Apr 29 16:54:03 linux kernel: z_decompress0: inflate returned -5 () > Apr 29 16:54:03 linux pppd[9090]: PPPIOCGFLAGS flags: c030c0 > Apr 29 16:54:03 linux pppd[9090]: Lost compression sync: disabling compression > > I had a look at the kernel patch of 2.6.18 - the lib/zlib/zlib_inflate was > changed a lot and for me it looks to be the reason of the problem. If you're referring to 4f3865fb57a04db7cca068fed1c15badc064a302, "zlib_inflate: Upgrade library code to a recent version" then that was mainly a zlib_inflate change, not a zlib_deflate change. But yes, I'd say that this patch might well have been the cause. http://userweb.kernel.org/~akpm/zlib-backout.patch is a backout patch against 2.6.21. If you apply that to 2.6.21 does it make ppp work again? - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
