Comment 2 for bug 1352570

StacktraceTop:
 nl_attr_get_size (nla=nla@entry=0x0) at ../lib/netlink.c:506
 format_generic_odp_key (a=a@entry=0x0, ds=ds@entry=0x7fff9005e1e0) at ../lib/odp-util.c:767
 format_odp_key_attr (a=a@entry=0xc5e990, ma=ma@entry=0x0, ds=ds@entry=0x7fff9005e1e0, verbose=verbose@entry=true) at ../lib/odp-util.c:1331
 odp_flow_format (key=key@entry=0xc5e920, key_len=key_len@entry=120, mask=mask@entry=0x0, mask_len=mask_len@entry=0, ds=ds@entry=0x7fff9005e1e0, verbose=verbose@entry=true) at ../lib/odp-util.c:1401
 log_flow_message (error=error@entry=2, operation=operation@entry=0x4d0b93 "flow_del", key=0xc5e920, key_len=120, mask=mask@entry=0x0, mask_len=mask_len@entry=0, stats=0x0, actions=actions@entry=0x0, actions_len=actions_len@entry=0, dpif=<optimized out>) at ../lib/dpif.c:1354