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smbd just crashed on me: In a debug message I called a routine preparing a
string that itself used debug_ctx. The outer routine also used it after the
inner routine had returned. It was still referencing the talloc context
that the outer debug_ctx() had given us, which the inner DEBUG had already
freed.
Prevents segfaults in some situations.
(For a non existent or empty record, we sometimes rely on the fetch operation
to return dsize==0 and sometimes we rely on dptr==NULL.)
Michael
In ctdb_transaction_commit(), when the trans2_commit control fails, there
is a race condition in the 1 second sleep between the local transaction_cancel
and the call to ctdb_replay_transaction(): The database is not locked, and
neither is the transaction_lock record. So another client can start and possibly
complete a new transaction in this gap, but only on the same node: The locking
of the transaction_lock record on a different node which involves migration of
the record to the other node has been disabled by introduction of the
transaction_active flag on the db which closes precisely this gap from the start
of the commit until the call to TRANS2_FINISH or TRANS2_ERROR.
But this mechanism does not cover the case where a process on the same node
tries to start a transaction: There is no obstacle to locking the transaction_lock
record because the record does not need to be migrated.
This commit closes this race condition in ctdb_transaction_fetch_start()
by using the new ctdb_ctrl_transaction_active() call to ask the local
ctdb daemon whether it has a transaction running on the database.
If so, the check is repeated until the running transaction is done.
This does introduce an additional call to the local ctdbd when starting
transactions, but it does close the (hopefully) last race condition.
Michael
There are two races in concurrent transactions on a single node.
One in starting a transaction and one with replay during commit.
This commit closes the first race by storing the client pid in the
transaction-lock record and comparing the stored pid against its own
pid after releasing the lock and refetching the record inside the
transaction.
Michael
If I read SMB_SUBSYSTEM right then the 2nd argument needs to be the file where
the static_init_rpc (in this case) is defined. This seems to have moved from
server.c to process.c.
Jelmer, please check!
Volker
This problem became visible after adding the picky -z defs linker option: On
Solaris libreplace had unresolved symbols, which showed up in the libtalloc
build. PAM_WINBIND_EXTRA_LIBS and WINBIND_NSS_EXTRA_LIBS had been workarounds
to make things work at two placeѕ. These variables have been obsoleted now.
This patch introduces LIBREPLACE_LIBS which contans the linker flags needed for
linking anything using libreplace.
