(Sandbox) Caught a bad syscall attempt (syscall kill)
tor(+0x1853fa)[0x6141342b23fa]
/lib64/libc.so.6(kill+0x7)[0x75008527ace7]
/lib64/libc.so.6(kill+0x7)[0x75008527ace7]
tor(+0x1c3bab)[0x6141342f0bab]
/lib64/libevent-2.0.so.5(event_base_loop+0x7a9)[0x7500863853f9]
tor(do_main_loop+0x29d)[0x61413417b78d]
tor(tor_main+0xe25)[0x61413417e5a5]
tor(main+0x19)[0x614134177009]
/lib64/libc.so.6(__libc_start_main+0xea)[0x75008526488a]
tor(_start+0x2a)[0x61413417705a]

Tor version 0.3.1.9
upgrading to 0.3.2.9 solves the issue.