Hi,
Trying to connect my Android VPN to L2TP/NPPPD OpenBSD lead to a kernel panic.
I use this snapshot :
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kern.version=OpenBSD 6.6-current (GENERIC.MP) #2: Mon Feb 24 00:02:18 MST 2020
[email protected]:/usr/src/sys/arch/i386/compile/GENERIC.MP
----
My L2TP conf is :
----
authentication LOCAL type local {
users-file "/etc/npppd/npppd-users"
}
tunnel L2TP protocol l2tp {
listen on 0.0.0.0
pipex yes
lcp-keepalive yes
lcp-keepalive-interval 60
}
ipcp IPCP {
pool-address 10.0.0.2-10.0.0.14
dns-servers 8.8.8.8
}
# use tun(4) interface. multiple ppp sessions concentrate one interface.
interface pppac0 address 10.0.0.1 ipcp IPCP
bind tunnel from L2TP authenticated by LOCAL to pppac0
----
dmesg after warm reboot show :
----
pipex: ppp=0 iface=pppac0 protocol=L2TP id=1532 PIPEX is ready.
panic: pool_cache_item_magic_check: mbufpl cpu free list modified:
item addr 0xd3c7a100+8 0x14001600!=0xe6394646
Stopped at db_enter+0x4: popl %ebp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
452832 39863 0 0x2 0x4000000 1 ld
*401050 85883 82 0x10 0 0K npppd
db_enter() at db_enter+0x4
panic(d0b6f7bc) at panic+0xcc
pool_cache_get(d0e997a8) at pool_cache_get+0x1ec
pool_get(d0e997a8,1) at pool_get+0x4f
m_getclr(1,3) at m_getclr+0x21
sys_getsockname(d33445f8,f5cc7650,f5cc7648) at sys_getsockname+0xb4
syscall(f5cc7690) at syscall+0x2df
Xsyscall_untramp() at Xsyscall_untramp+0xa9
end of kernel
----
Last known snap working with the same conf :
----
OpenBSD 6.6-current (GENERIC.MP) #514: Sat Jan 25 02:23:56 MST 2020
[email protected]:/usr/src/sys/arch/i386/compile/GENERIC.MP
----
Cheers,
--
Olivier
