(Sandbox) Caught a bad syscall attempt (syscall kill)

maint-0.3.2 is failing make test-network-all right now with:

============================================================ T= 1510233993
(Sandbox) Caught a bad syscall attempt (syscall kill)
/home/f/Computers/tor/mytor/src/or/tor(+0x19f21a)[0x55c60558821a]
/lib/x86_64-linux-gnu/libc.so.6(kill+0x7)[0x7fa9605d4317]
/lib/x86_64-linux-gnu/libc.so.6(kill+0x7)[0x7fa9605d4317]
/home/f/Computers/tor/mytor/src/or/tor(+0x1de69b)[0x55c6055c769b]
/usr/lib/x86_64-linux-gnu/libevent-2.1.so.6(+0x229ba)[0x7fa9618e79ba]
/usr/lib/x86_64-linux-gnu/libevent-2.1.so.6(event_base_loop+0x5a7)[0x7fa9618e8537]
/home/f/Computers/tor/mytor/src/or/tor(do_main_loop+0x22d)[0x55c60543b90d]
/home/f/Computers/tor/mytor/src/or/tor(tor_main+0xe1d)[0x55c60543e5fd]
/home/f/Computers/tor/mytor/src/or/tor(main+0x19)[0x55c6054371f9]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1)[0x7fa9605c12e1]
/home/f/Computers/tor/mytor/src/or/tor(_start+0x2a)[0x55c60543724a]