Looks like I've found the reason why charon want to open /dev/tty - just
to say about buffer overflow error:
01[IKE] CHILD_SA ikev2-with-eap-loadtest{221} established with SPIs c26fb333_i
c1ac3989_o and TS 172.31.59.95/32 === 10.0.0.221/32
16[IKE] CHILD_SA ikev2-with-eap-loadtest{222} established with SPIs c0abb568_i
c9bb167e_o and TS 172.31.59.95/32 === 10.0.0.222/32
14[NET] received packet: from 172.31.62.150[500] to 172.31.59.95[500] (76 bytes)
02[N*** buffer overflow detected ***: /usr/lib/ipsec/charon terminated
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x7338f)[0x7fbfa132538f]
/lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x5c)[0x7fbfa13bcc9c]
/lib/x86_64-linux-gnu/libc.so.6(+0x109b60)[0x7fbfa13bbb60]
/lib/x86_64-linux-gnu/libc.so.6(+0x10abe7)[0x7fbfa13bcbe7]
/usr/lib/ipsec/libradius.so.0(+0x2fcf)[0x7fbf9c0ecfcf]
/usr/lib/ipsec/libradius.so.0(+0x3660)[0x7fbf9c0ed660]
/usr/lib/ipsec/plugins/libstrongswan-eap-radius.so(+0x4af1)[0x7fbf9c2f5af1]
/usr/lib/ipsec/plugins/libstrongswan-eap-radius.so(+0x4f37)[0x7fbf9c2f5f37]
/usr/lib/ipsec/plugins/libstrongswan-eap-radius.so(+0x52af)[0x7fbf9c2f62af]
/usr/lib/ipsec/libcharon.so.0(+0x9e3d)[0x7fbfa189ee3d]
/usr/lib/ipsec/libcharon.so.0(+0x25419)[0x7fbfa18ba419]
/usr/lib/ipsec/libcharon.so.0(+0x302eb)[0x7fbfa18c52eb]
/usr/lib/ipsec/libcharon.so.0(+0x25e4f)[0x7fbfa18bae4f]
/usr/lib/ipsec/libcharon.so.0(+0x2006f)[0x7fbfa18b506f]
/usr/lib/ipsec/libstrongswan.so.0(+0x28df2)[0x7fbfa1d37df2]
/usr/lib/ipsec/libstrongswan.so.0(+0x2bc14)[0x7fbfa1d3ac14]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x8182)[0x7fbfa167f182]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7fbfa13ac47d]
======= Memory map: ========
7fbf6c000000-7fbf6c0bc000 rw-p 00000000 00:00 0
7fbf6c0bc000-7fbf70000000 ---p 00000000 00:00 0
7fbf74000000-7fbf740d2000 rw-p 00000000 00:00 0
....
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https://bugs.launchpad.net/bugs/1549436
Title:
AppArmor kills StronSwan daemon 'charon'
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