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It's a bit shocking how many references we have to global
contexts. Make this a bit more obvious.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
locking.tdb will not have a LOCK_ORDER anymore, this will be done by
the code in g_lock.c. We need to allow opening a database with dbwrap
without having a lock order.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
A cstatus != 0 or a data.dsize != sizeof(uint32_t)
does not guarantee to have no received data referenced by data.dptr.
Therefore, make sure data.dptr is free'd.
Reusing the same data structure as data input and data output parameter
can lead to wrong results, especially when the output parameters value
is used to detect errors. Create the additional local variable outdata
to prevent this issue.
Signed-off-by: Swen Schillig <swen@linux.ibm.com>
Reviewed-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Martin Schwenke <martin@meltin.net>
Autobuild-User(master): Martin Schwenke <martins@samba.org>
Autobuild-Date(master): Thu Apr 2 11:26:32 UTC 2020 on sn-devel-184
Include the path where db_open() tried to find the ctdb socket
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Found by "Christopher O Cowan - Christopher.O.Cowan@ibm.com" <Christopher.O.Cowan@ibm.com>
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Following backtrace is observed on executing `smbstatus` with at least
one SMB client connection established:
PANIC: assert failed at ../../lib/dbwrap/dbwrap.c(82): rec->value_valid
PANIC (pid 350270): assert failed: rec->value_valid
BACKTRACE: 15 stack frames:
#0 /usr/local/lib/libsamba-util.so.0(log_stack_trace+0x1f)
[0x7fbbd9b32047]
#1 /usr/local/lib/libsmbconf.so.0(smb_panic_s3+0x74) [0x7fbbd9c1e6ff]
#2 /usr/local/lib/libsamba-util.so.0(smb_panic+0x28) [0x7fbbd9b32012]
#3 /usr/local/lib/samba/libdbwrap-
samba4.so(dbwrap_record_get_value+0x86) [0x7fbbd95800ac]
#4 /usr/local/lib/samba/libsmbd-base-samba4.so(+0x28f563)
[0x7fbbd999e563]
#5 /usr/local/lib/samba/libsamba-cluster-support-samba4.so(+0x7851)
[0x7fbbd92c7851]
#6 /usr/local/lib/samba/libsamba-cluster-support-
samba4.so(ctdbd_traverse+0x4ca) [0x7fbbd92cc641]
#7 /usr/local/lib/samba/libsamba-cluster-support-samba4.so(+0x73eb)
[0x7fbbd92c73eb]
#8 /usr/local/lib/samba/libsamba-cluster-support-samba4.so(+0x7a52)
[0x7fbbd92c7a52]
#9 /usr/local/lib/samba/libdbwrap-samba4.so(dbwrap_traverse_read+0x35)
[0x7fbbd9580de5]
#10 /usr/local/lib/samba/libsmbd-base-
samba4.so(smbXsrv_tcon_global_traverse+0xc5) [0x7fbbd999e7d9]
#11 smbstatus(connections_forall_read+0x114) [0x55d17872b8ee]
#12 smbstatus(main+0x7b2) [0x55d17872a2f3]
#13 /lib64/libc.so.6(__libc_start_main+0xf3) [0x7fbbd93a21a3]
#14 smbstatus(_start+0x2e) [0x55d17872894e]
Can not dump core: corepath not set up
Assertion on rec->value_valid fails as it is uninitialized in the
following functions:
traverse_read_callback
traverse_persistent_callback_read
Signed-off-by: Anoop C S <anoopcs@redhat.com>
Reviewed-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Wed Jan 8 23:24:58 UTC 2020 on sn-devel-184
The history of this file is a mess with lots of bugs. Most of the bugs
I believe are based on the cache of database contents we maintain in
struct dbwrap_watch_rec. This patch removes that cache and does all
modifications directly in the backend database.
This means we have to mess with the database format in a few more
places, but I think the format is simple enough that this does not
really hurt.
I tried for a few days to split this up into small pieces that are
easier to understand, but every time I separated out individual chunks
I found difficult to track down bugs that are all resolved in the
final code presented here. It's more lines of code, but I hope it's more
robust.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
With the wakeup messages changed, we don't need to store what used to
be the old message in the struct dbwrap_watched_watch_state
anymore. We still need to store the key that is watched for removal of
our watch entry in the request destructor
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
The instance ID per process globally identifies a watch instance
across databases. It's not necessary to send the database ID and the
watched key across, the uin64_t instance ID is sufficient.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This can lead to very confusing bugs, and the code right now does not
deal with it well.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
After dbwrap_record_storev()/delete(), dbwrap_record_get_value()
information is stale. Assert on the attempt to re-fetch data after it
became stale. This can't protect against someone copying the result
from dbwrap_record_get_value() somewhere else, but it's better than
nothing.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
I want to reduce dbwrap_record_get_value(). It makes the caller believe it can
make a copy of the TDB_DATA returned and that the value remains constant. It's
not, as you can always do a dbwrap_record_store().
This patch removes one requirement for getting the value out of a
db_record via dbwrap_record_get_value(). You can still make a copy, but from an
API perspective to me it's more obvious that "value" as a parameter to the
callback has a limited lifetime.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
"wrec->num_watchers" changes in dbwrap_watch_rec_del_watcher(). In
32d6cc84c I forgot to update the copy of that variable.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Fri Oct 18 22:28:07 UTC 2019 on sn-devel-184
This fixes the following flaky test:
UNEXPECTED(failure): samba3.raw.oplock.batch26(nt4_dc)
REASON: Exception: Exception: (../../source4/torture/raw/oplock.c:3718): wrong value for break_info.count got 0x2 - should be 0x1
You can reproduce it with two small msleeps, which means it's a race
condition:
diff --git a/source3/smbd/open.c b/source3/smbd/open.c
index 20b5a3e294c..126c7fc021d 100644
--- a/source3/smbd/open.c
+++ b/source3/smbd/open.c
@@ -1917,6 +1917,14 @@ NTSTATUS send_break_message(struct messaging_context *msg_ctx,
DATA_BLOB blob;
NTSTATUS status;
+ {
+ static bool sent = false;
+ if (sent) {
+ smb_msleep(500);
+ }
+ sent = true;
+ }
+
if (DEBUGLVL(10)) {
struct server_id_buf buf;
DBG_DEBUG("Sending break message to %s\n",
diff --git a/source3/smbd/oplock.c b/source3/smbd/oplock.c
index b3da84b1269..d9c4dbb9487 100644
--- a/source3/smbd/oplock.c
+++ b/source3/smbd/oplock.c
@@ -858,6 +858,8 @@ static void process_oplock_break_message(struct messaging_context *msg_ctx,
uint16_t break_to;
bool break_needed = true;
+ smb_msleep(100);
+
msg = talloc(talloc_tos(), struct oplock_break_message);
if (msg == NULL) {
DBG_WARNING("talloc failed\n");
15a8af075a introduced a bug where we immediately wake up ourselves
after doing a watch_send, leading to two inter-smbd oplock break
messages for this case. In theory, this should not matter, as in the
oplock break handler in the destination smbd we check
(fsp->sent_oplock_break != NO_BREAK_SENT)
so that the break does not get sent twice. However, with the above two
sleeps the oplock holding client could send out its oplock downgrade
while the second inter-smbd break messages was on its way.
The real fix would be to note in the share mode array that the
inter-smbd message has already been sent, but as other users of
dbwrap_watched_watch_send might also be affected by this bug, this fix
should be sufficient to get rid of this flaky test.
Unfortunately, dbwrap_watch.c is now pretty complex and needs some
serious refactoring to become understandable again. But that's
something for another day, sorry.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Before 15a8af075a we did not have a separately allocated watchers
array and dbwrap_watched_save() could play (too) smart tricks with
dbwrap_record_storev(). Now that we always have watchers talloc'ed, we
can remove those smart tricks from dbwrap_watched_save() in the next
commit.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Samba so far on a dbwrap_watch record either watches or stores a
record, but never both from the same db_record instance acquired from
a dbwrap_fetch_locked(). In one of the next commits this will change,
we will watch a record and at the same time store data into it. This
patch enables a watch_send() followed by a storev() by properly
keeping the watchers around.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Fixes:
source3/lib/dbwrap/dbwrap_ctdb.c:530:39: warning: Access to field 'm_write' results in a dereference of a null pointer (loaded from field 'transaction') <--[clang]
if (pull_newest_from_marshall_buffer(ctx->transaction->m_write, key,
Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
Fixes:
source3/lib/dbwrap/dbwrap_ctdb.c:95:2: warning: Value stored to 'ret' is never read <--[clang]
ret = ctdbd_init_connection(mem_ctx,
^ ~~~~~~
Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
Without this, to notify watchers you need to actually store data. This
might be a waste of resources. locking.tdb waiters might actually wait
for leases.tdb or brlock.tdb changes, and locking.tdb records can be
large.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
In the next step I want to make dbwrap_watched_wakeup() publically
available under that canonical name.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Thu Sep 13 01:34:30 CEST 2018 on sn-devel-144
state->count wasn't incremented and is returned at the end of a
dbwrap_traverse().
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
NULL initialize pointers, check function return values, explicit
variable check against NULL.
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This just moves the talloc_memdup() out of the if condition as per
README.Coding.
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This reflects that the messaging context is also used outside of the
server processes.
The command used for the rename:
find . -name '*.[hc]' -print0 | xargs -0 sed -i 's/server_messaging_context/global_messaging_context/'
Signed-off-by: Christof Schmitt <cs@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Point out in the API that "backend" talloc_moves into the watched
database.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Fri Aug 17 21:29:15 CEST 2018 on sn-devel-144
