When I apply this series I get lots of segfaults in the testsuite, e.g.:

=================================================================
==27505==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000008 (pc 
0x5557321b0f98 bp 0x7fffa7a2d230 sp 0x7fffa7a2d220 T0)
==27505==The signal is caused by a READ memory access.
==27505==Hint: address points to the zero page.
    #0 0x5557321b0f97 in hmap_remove ../include/openvswitch/hmap.h:287
    #1 0x5557321b0f97 in ovsdb_idl_row_destroy ../lib/ovsdb-idl.c:3106
    #2 0x5557321b1ac0 in ovsdb_idl_row_destroy ../lib/ovsdb-idl.c:3104
    #3 0x5557321b1ac0 in ovsdb_idl_row_clear_arcs ../lib/ovsdb-idl.c:3043
    #4 0x5557321b2198 in ovsdb_idl_delete_row ../lib/ovsdb-idl.c:3207
    #5 0x5557321b2e3a in ovsdb_idl_process_update2 ../lib/ovsdb-idl.c:2444
    #6 0x5557321b2e3a in ovsdb_idl_db_parse_update__ ../lib/ovsdb-idl.c:2304
    #7 0x5557321b2e3a in ovsdb_idl_db_parse_update ../lib/ovsdb-idl.c:2356
    #8 0x5557321b429a in ovsdb_idl_db_parse_update_rpc ../lib/ovsdb-idl.c:2187
    #9 0x5557321b557a in ovsdb_idl_db_parse_update_rpc ../lib/ovsdb-idl.c:2143
    #10 0x5557321b557a in ovsdb_idl_process_msg ../lib/ovsdb-idl.c:822
    #11 0x5557321b557a in ovsdb_idl_run ../lib/ovsdb-idl.c:901
    #12 0x5557321b557a in ovsdb_idl_run ../lib/ovsdb-idl.c:866
    #13 0x555731ed7015 in bridge_run ../vswitchd/bridge.c:2957
    #14 0x555731eb9464 in main ../vswitchd/ovs-vswitchd.c:125
    #15 0x7f4666eab09a in __libc_start_main ../csu/libc-start.c:308
    #16 0x555731ebbe99 in _start 
(/home/blp/nicira/ovs/_build/vswitchd/ovs-vswitchd+0x119e99)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV ../include/openvswitch/hmap.h:287 in hmap_remove
==27505==ABORTING
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