On Wed, Mar 14, 2018 at 08:02:17AM -0700, Stephen Hemminger wrote: > > > Begin forwarded message: > > Date: Wed, 14 Mar 2018 06:56:09 +0000 > From: bugzilla-dae...@bugzilla.kernel.org > To: step...@networkplumber.org > Subject: [Bug 199109] New: pptp: kernel printk "recursion detected", and then > reboot itself > > > https://bugzilla.kernel.org/show_bug.cgi?id=199109 > > Bug ID: 199109 > Summary: pptp: kernel printk "recursion detected", and then > reboot itself > Product: Networking > Version: 2.5 > Kernel Version: 4.9.77 > Hardware: Mips32 > OS: Linux > Tree: Mainline > Status: NEW > Severity: high > Priority: P1 > Component: IPV4 > Assignee: step...@networkplumber.org > Reporter: xuheng...@zoho.com > Regression: No > > Created attachment 274715 > --> https://bugzilla.kernel.org/attachment.cgi?id=274715&action=edit > system log > > Use openwrt LEDE, (gcc version 5.5.0 (OpenWrt GCC 5.5.0 r5932-9c4fe10) ). > When use pptp, make WAN(eth1) down and then make WAN(eth1) up, pptp will > redial > itself. Do this in a loop. > > After a while, kernel print "recursion detected" and "net_ratelimit: 49422 > callbacks suppressed", print this many times, then system reboot. > > When add more printk in driver "driver/net/ppp/ppp_generic.c", fond it fall in > loop in "static void __ppp_xmit_process(struct ppp *ppp)", which called by > "static void __ppp_channel_push(struct channel *pch)". > __ppp_channel_push() locked ppp->xmit_recursion, and loop for long time( while > (!ppp->xmit_pending && (skb = skb_dequeue(&ppp->file.xq))) ppp_send_frame(ppp, > skb); ). Some other thread want to lock ppp->xmit_recursion, but failed. > > Hi Xuheng,
Are you sure that your PPTP packets aren't routed back to your PPP interface? What's the IP address of the PPTP server? Regards, Guillaume
