[ovs-discuss] assertion !idl->change_seqno failed in ovsdb_idl_get_mode()

[david jhon]

Hi,

I am trying to insert records in ovsdb customized table from within
openvswitch but I am facing following issues on calling
ovsdb_idl_add_column function :

ovs|01659|util(handler21)|EMER|../lib/ovsdb-idl.c:451: assertion
!idl->change_seqno failed in ovsdb_idl_get_mode().

I am using same idl struct which is being initialized in bridge_init()
method by vswitchd/bridge.c.
I am using following steps to insert record in ovsdb.

static void test(const char *name, const char *brname)
{
  const struct ovsrec_open_vswitch *cfg = ovsrec_open_vswitch_first(idl);
  const struct ovsrec_bridge *br_cfg;
  if(cfg) {
    ovsdb_idl_add_column(idl, &ovsrec_bridge_col_test);
    ovsdb_idl_add_column(idl, &ovsrec_test_col_agent);
    ovsdb_idl_add_column(idl, &ovsrec_test_col_name);

    struct bridge *br = bridge_lookup(brname);
    if(br) {
       br_cfg = br->cfg;
       cmd_check_test(br_cfg, name, brname);
    }
  }
}
cmd_add_test(const struct ovsrec_bridge *br, const char *agent, const char
*name)
{
    struct ovsrec_test *test;
    struct ovsdb_idl_txn *txn;
    txn = ovsdb_idl_txn_create(idl);
    ovsrec_init();

    if(br)
    {
      elef = ovsrec_test_insert(txn);
      ovsrec_test_set_agent(test, agent);
      ovsrec_test_set_name(test, name);
      bridge_insert_test(br, test);
    }
    ovsdb_idl_txn_commit(txn);
    ovsdb_idl_txn_destroy(txn);
}

I added a new command in ovs-vsctl to test the insertion of record in ovsdb
which works pretty good, but I am facing issues while adding record from
within openvswith code such as ofproto-dpif-xlate.c file.

Moreover, I tried the code while omitting the ovsdb_idl_add_column function
but it throws following bug in syslog:

ovs-vswitchd: ovs|01343|ovsdb_idl(handler20)|ERR|Bug: Attempt to write to a
read/write column (test:agent) when explicitly configured not to.
ovs|01344|ovsdb_idl(handler20)|ERR|Bug: Attempt to write to a read/write
column (test:name) when explicitly configured not to.
ovs|01345|ovsdb_idl(handler20)|ERR|Bug: Attempt to write to a read/write
column (Bridge:test) when explicitly configured not to.

ovs|01346|jsonrpc(handler20)|DBG|unix:/root/root/run/db.sock: send request,
method="transact",
params=["Open_vSwitch",{"lock":"ovs_vswitchd","op":"assert"},{"uuid-name":"rowd5e645e3_5948_4c63_a223_8fefa7f72763","row":{},"op":"insert","table":"test"}],
id=20

I hope someone here could help me resolve this bug or suggest me some
workaround. I'll be really grateful for that. Thanks a lot!


Kind Regards,
David
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