[Bug 236853] panic: page fault on rtsock.c

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Thu Mar 28 15:28:45 UTC 2019


            Bug ID: 236853
           Summary: panic: page fault  on rtsock.c
           Product: Base System
           Version: CURRENT
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: lenzi.sergio at gmail.com

The system panics on /usr/src/sys/net/rtsock.c:839 and all references to
ifp->if_addr->ifa_addr   the pointer ifp->if_addr is invalid.  some race
condition occurs that releases the ifp->if_addr and when the code tries to read
the next pointer a page fault occurs.... sometimes it happens in
/usr/src/sys/net/rtsock.c:1581 too

how to reproduce:
setup (1) a freebsd 12 or 13 as a ppp-in server (man ppp) using the setup in
the example at http://www.k1.com.br/crash/ppp, than go to another freebsd and
using the ppptun.conf, connect to the (1)  using the command ppp -ddial ppptun
after several connects and disconnects, the (1)  panics...  sometimes the
simple route get "any ppp address"  is enough to panic the system.

The resulting debug files of the panic is in the http://www.k1.com.br/crash

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