Date: Wed, 28 Nov 2018 08:53:58 +0000 From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 230498] Fatal trap 12: page fault while in kernel mode in sysctl_dumpentry from sysctl NET_RT_DUMP Message-ID: <bug-230498-7501-PelQOUDJjp@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-230498-7501@https.bugs.freebsd.org/bugzilla/> References: <bug-230498-7501@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D230498 --- Comment #20 from Franck Rousseau <Franck.Rousseau@imag.fr> --- (In reply to commit-hook from comment #19) As mentioned in comment #9 above, this patch breaks ppp, I get this when tr= ying to re-open a second connection, this is the stage at which the crash occured before: PPp ON localhost> Warning: iface add: ioctl(SIOCAIFADDR, 192.168.0.2 -> 192.168.0.1): File exists Error: ipcp_InterfaceUp: unable to set ip address Also, the patch in attachment #199450 does not fix this specific problem, we still crash the kernel with the procedure described earlier in comment #12.= As I said, I could narrow down the cause and find a fix for our use case, by u= sing two different IPv4 addresses for Ethernet and PPP tun interfaces the kernel does not crash anymore. About the fix, I suspect that internal structures are corrupted, so any kin= d of fix at this point will fail, for example with this patch on 11.2-p4 it looks like I keep getting these values after the crash: (kgdb) print rt->rt_ifp->if_flags $3 =3D 3 (kgdb) print rt->rt_ifp->if_index $4 =3D 63488 I will try to setup on-line debugging to watch internal structures and see = if I can get an idea of what is breaking things up. --=20 You are receiving this mail because: You are the assignee for the bug.=
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