Wasn't this fixed last year by:

commit 8bd3754cff3aa6e80e73cb56042cdc6f76d6510e Author: Dan Carpenter <dan.carpenter(a)oracle.com&gt; Date:   Fri Oct 25 13:35:08 2019 +0300     cifs: rename a variable in SendReceive()         Smatch gets confused because we sometimes refer to "server->srv_mutex" and     sometimes to "sess->server->srv_mutex".  They refer to the same lock so     let's just make this consistent.         Signed-off-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt;     Signed-off-by: Steve French <stfrench(a)microsoft.com&gt; diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c index ca3de62688d6..f27842fb9f75 100644 --- a/fs/cifs/transport.c +++ b/fs/cifs/transport.c @@ -1287,7 +1287,7 @@ SendReceive(const unsigned int xid, struct cifs_ses *ses,           rc = allocate_mid(ses, in_buf, &midQ);         if (rc) { -               mutex_unlock(&ses->server->srv_mutex); +               mutex_unlock(&server->srv_mutex);                 /* Update # of requests on wire to server */                 add_credits(server, &credits, 0);                 return rc; ____________________________________________________________________________ From: Julia Lawall <julia.lawall(a)inria.fr&gt; Sent: Thursday, June 18, 2020 10:08 AM To: Ronnie Sahlberg <lsahlber(a)redhat.com&gt; Cc: Steven French <Steven.French(a)microsoft.com&gt;; linux-kernel(a)vger.kernel.org <linux-kernel(a)vger.kernel.org&gt;; kbuild-all(a)lists.01.org <kbuild-all(a)lists.01.org&gt; Subject: [EXTERNAL] fs/cifs/transport.c:1284:2-8: preceding lock on line 1277 (fwd)   Hello, This is not actually a bug.  But for both tools and humans, it might be better to refer to the lock on line 1281 in the same way that it is referred to on line 1277. julia ---------- Forwarded message ---------- Date: Thu, 18 Jun 2020 08:07:12 +0800 From: kernel test robot <lkp(a)intel.com&gt; To: kbuild(a)lists.01.org Cc: lkp(a)intel.com, Julia Lawall <julia.lawall(a)lip6.fr&gt; Subject: fs/cifs/transport.c:1284:2-8: preceding lock on line 1277 CC: kbuild-all(a)lists.01.org CC: linux-kernel(a)vger.kernel.org TO: Ronnie Sahlberg <lsahlber(a)redhat.com&gt; CC: Steve French <stfrench(a)microsoft.com&gt; tree:  https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2F... l.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Ftorvalds%2Flinux.git&amp;data=0 2%7C01%7CSteven.French%40microsoft.com%7C206f157b15804da9dad408d81399862d% 7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637280897690591644&amp;sdata= rglSnjoPRmT8g0Fj9k2jeCz11jZmXeUmB8W5vnD3LO4%3D&amp;reserved=0 master head:   1b5044021070efa3259f3e9548dc35d1eb6aa844 commit: afe6f65353b644f55875d42d812ffe87f1887d68 cifs: add new debugging macro cifs_server_dbg date:   9 months ago :::::: branch date: 6 hours ago :::::: commit date: 9 months ago config: xtensa-randconfig-c024-20200617 (attached as .config) compiler: xtensa-linux-gcc (GCC) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Reported-by: Julia Lawall <julia.lawall(a)lip6.fr&gt; coccinelle warnings: (new ones prefixed by >>) >> fs/cifs/transport.c:1284:2-8: preceding lock on line 1277 #https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kerne l.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Ftorvalds%2Flinux.git%2Fcommit%2 F%3Fid%3Dafe6f65353b644f55875d42d812ffe87f1887d68&amp;data=02%7C01%7CSteve n.French%40microsoft.com%7C206f157b15804da9dad408d81399862d%7C72f988bf86f1 41af91ab2d7cd011db47%7C1%7C0%7C637280897690591644&amp;sdata=AeeIaHJgLjCns9 aksXdMxnYone5UZVM3n2DREKL6N6c%3D&amp;reserved=0 git remote add linushttps://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgi... l.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Ftorvalds%2Flinux.git&amp;data=0 2%7C01%7CSteven.French%40microsoft.com%7C206f157b15804da9dad408d81399862d% 7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637280897690601647&amp;sdata= K6zcUzaXsw9IkszPgZX66llW8857a9ApKU9e2Z9rDFY%3D&amp;reserved=0 git remote update linus git checkout afe6f65353b644f55875d42d812ffe87f1887d68 vim +1284 fs/cifs/transport.c 738f9de5cdb917 Pavel Shilovsky 2016-11-23  1233 ^1da177e4c3f41 Linus Torvalds  2005-04-16  1234  int 96daf2b09178d8 Steve French    2011-05-27  1235  SendReceive(const unsigned int xid, struct cifs_ses *ses, ^1da177e4c3f41 Linus Torvalds  2005-04-16  1236              struct smb_hdr *in_buf, struct smb_hdr *out_buf, 480b1cb9dad894 Ronnie Sahlberg 2019-03-08  1237              int *pbytes_returned, const int flags) ^1da177e4c3f41 Linus Torvalds  2005-04-16  1238  { ^1da177e4c3f41 Linus Torvalds  2005-04-16  1239          int rc = 0; ^1da177e4c3f41 Linus Torvalds  2005-04-16  1240          struct mid_q_entry *midQ; fb2036d817584d Pavel Shilovsky 2016-11-23  1241          unsigned int len = be32_to_cpu(in_buf->smb_buf_length); fb2036d817584d Pavel Shilovsky 2016-11-23  1242          struct kvec iov = { .iov_base = in_buf, .iov_len = len }; fb2036d817584d Pavel Shilovsky 2016-11-23  1243          struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; 34f4deb7c56c6f Pavel Shilovsky 2019-01-16  1244          struct cifs_credits credits = { .value = 1, .instance = 0 }; afe6f65353b644 Ronnie Sahlberg 2019-08-28  1245          struct TCP_Server_Info *server = ses->server; ^1da177e4c3f41 Linus Torvalds  2005-04-16  1246 ^1da177e4c3f41 Linus Torvalds  2005-04-16  1247          if (ses == NULL) { f96637be081141 Joe Perches     2013-05-04  1248                  cifs_dbg(VFS, "Null smb session\n"); ^1da177e4c3f41 Linus Torvalds  2005-04-16  1249                  return -EIO; ^1da177e4c3f41 Linus Torvalds  2005-04-16  1250          } afe6f65353b644 Ronnie Sahlberg 2019-08-28  1251          if (server == NULL) { f96637be081141 Joe Perches     2013-05-04  1252                  cifs_dbg(VFS, "Null tcp session\n"); ^1da177e4c3f41 Linus Torvalds  2005-04-16  1253                  return -EIO; ^1da177e4c3f41 Linus Torvalds  2005-04-16  1254          } ^1da177e4c3f41 Linus Torvalds  2005-04-16  1255 afe6f65353b644 Ronnie Sahlberg 2019-08-28  1256          if (server->tcpStatus == CifsExiting) 31ca3bc3c569f9 Steve French    2005-04-28  1257                  return -ENOENT; 31ca3bc3c569f9 Steve French    2005-04-28  1258 ^1da177e4c3f41 Linus Torvalds  2005-04-16  1259          /* Ensure that we do not send more than 50 overlapping requests ^1da177e4c3f41 Linus Torvalds  2005-04-16  1260             to the same server. We may make this configurable later or ^1da177e4c3f41 Linus Torvalds  2005-04-16  1261             use ses->maxReq */ ^1da177e4c3f41 Linus Torvalds  2005-04-16  1262 fb2036d817584d Pavel Shilovsky 2016-11-23  1263          if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { afe6f65353b644 Ronnie Sahlberg 2019-08-28  1264                  cifs_server_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", fb2036d817584d Pavel Shilovsky 2016-11-23  1265                           len); 6d9c6d543165d1 Volker Lendecke 2008-12-08  1266                  return -EIO; 6d9c6d543165d1 Volker Lendecke 2008-12-08  1267          } 6d9c6d543165d1 Volker Lendecke 2008-12-08  1268 afe6f65353b644 Ronnie Sahlberg 2019-08-28  1269          rc = wait_for_free_request(server, flags, &credits.instance); 7ee1af765dfa31 Jeremy Allison  2006-08-02  1270          if (rc) 7ee1af765dfa31 Jeremy Allison  2006-08-02  1271                  return rc; ^1da177e4c3f41 Linus Torvalds  2005-04-16  1272 ^1da177e4c3f41 Linus Torvalds  2005-04-16  1273          /* make sure that we sign in the same order that we send on this socket ^1da177e4c3f41 Linus Torvalds  2005-04-16  1274             and avoid races inside tcp sendmsg code that could cause corruption ^1da177e4c3f41 Linus Torvalds  2005-04-16  1275             of smb data */ ^1da177e4c3f41 Linus Torvalds  2005-04-16  1276 afe6f65353b644 Ronnie Sahlberg 2019-08-28 @1277          mutex_lock(&server->srv_mutex); ^1da177e4c3f41 Linus Torvalds  2005-04-16  1278 7ee1af765dfa31 Jeremy Allison  2006-08-02  1279          rc = allocate_mid(ses, in_buf, &midQ); 7ee1af765dfa31 Jeremy Allison  2006-08-02  1280          if (rc) { 72ca545b2d83ac Jeff Layton     2008-12-01  1281                  mutex_unlock(&ses->server->srv_mutex); 7ee1af765dfa31 Jeremy Allison  2006-08-02  1282                  /* Update # of requests on wire to server */ afe6f65353b644 Ronnie Sahlberg 2019-08-28  1283                  add_credits(server, &credits, 0); 7ee1af765dfa31 Jeremy Allison  2006-08-02 @1284                  return rc; ^1da177e4c3f41 Linus Torvalds  2005-04-16  1285          } ^1da177e4c3f41 Linus Torvalds  2005-04-16  1286 afe6f65353b644 Ronnie Sahlberg 2019-08-28  1287          rc = cifs_sign_smb(in_buf, server, &midQ->sequence_number); 829049cbb1d2dd Volker Lendecke 2008-12-06  1288          if (rc) { afe6f65353b644 Ronnie Sahlberg 2019-08-28  1289                  mutex_unlock(&server->srv_mutex); 829049cbb1d2dd Volker Lendecke 2008-12-06  1290                  goto out; 829049cbb1d2dd Volker Lendecke 2008-12-06  1291          } ^1da177e4c3f41 Linus Torvalds  2005-04-16  1292 7c9421e1a9ce8d Pavel Shilovsky 2012-03-23  1293          midQ->mid_state = MID_REQUEST_SUBMITTED; 789e66612367f9 Steve French    2011-08-09  1294 afe6f65353b644 Ronnie Sahlberg 2019-08-28  1295          cifs_in_send_inc(server); afe6f65353b644 Ronnie Sahlberg 2019-08-28  1296          rc = smb_send(server, in_buf, len); afe6f65353b644 Ronnie Sahlberg 2019-08-28  1297          cifs_in_send_dec(server); 789e66612367f9 Steve French    2011-08-09  1298          cifs_save_when_sent(midQ); ad313cb86dfba2 Jeff Layton     2013-04-03  1299 ad313cb86dfba2 Jeff Layton     2013-04-03  1300          if (rc < 0) afe6f65353b644 Ronnie Sahlberg 2019-08-28  1301                  server->sequence_number -= 2; ad313cb86dfba2 Jeff Layton     2013-04-03  1302 afe6f65353b644 Ronnie Sahlberg 2019-08-28  1303          mutex_unlock(&server->srv_mutex); 7ee1af765dfa31 Jeremy Allison  2006-08-02  1304 7ee1af765dfa31 Jeremy Allison  2006-08-02  1305          if (rc < 0) 7ee1af765dfa31 Jeremy Allison  2006-08-02  1306                  goto out; 7ee1af765dfa31 Jeremy Allison  2006-08-02  1307 afe6f65353b644 Ronnie Sahlberg 2019-08-28  1308          rc = wait_for_response(server, midQ); 1be912dde772b7 Jeff Layton     2011-01-28  1309          if (rc != 0) { afe6f65353b644 Ronnie Sahlberg 2019-08-28  1310                  send_cancel(server, &rqst, midQ); 1be912dde772b7 Jeff Layton     2011-01-28  1311                  spin_lock(&GlobalMid_Lock); 7c9421e1a9ce8d Pavel Shilovsky 2012-03-23  1312                  if (midQ->mid_state == MID_REQUEST_SUBMITTED) { 1be912dde772b7 Jeff Layton     2011-01-28  1313                          /* no longer considered to be "in-flight" */ 1be912dde772b7 Jeff Layton     2011-01-28  1314                          midQ->callback = DeleteMidQEntry; 1be912dde772b7 Jeff Layton     2011-01-28  1315                          spin_unlock(&GlobalMid_Lock); afe6f65353b644 Ronnie Sahlberg 2019-08-28  1316                          add_credits(server, &credits, 0); 1be912dde772b7 Jeff Layton     2011-01-28  1317                          return rc; 1be912dde772b7 Jeff Layton     2011-01-28  1318                  } 1be912dde772b7 Jeff Layton     2011-01-28  1319                  spin_unlock(&GlobalMid_Lock); 1be912dde772b7 Jeff Layton     2011-01-28  1320          } 14a441a2b4ee1d Steve French    2006-07-16  1321 afe6f65353b644 Ronnie Sahlberg 2019-08-28  1322          rc = cifs_sync_mid_result(midQ, server); 053d50344568e5 Jeff Layton     2011-01-11  1323          if (rc != 0) { afe6f65353b644 Ronnie Sahlberg 2019-08-28  1324                  add_credits(server, &credits, 0); 7ee1af765dfa31 Jeremy Allison  2006-08-02  1325                  return rc; 7ee1af765dfa31 Jeremy Allison  2006-08-02  1326          } 7ee1af765dfa31 Jeremy Allison  2006-08-02  1327 2c8f981d93f830 Jeff Layton     2011-05-19  1328          if (!midQ->resp_buf || !out_buf || 7c9421e1a9ce8d Pavel Shilovsky 2012-03-23  1329              midQ->mid_state != MID_RESPONSE_RECEIVED) { 7ee1af765dfa31 Jeremy Allison  2006-08-02  1330                  rc = -EIO; afe6f65353b644 Ronnie Sahlberg 2019-08-28  1331                  cifs_server_dbg(VFS, "Bad MID state?\n"); 2c8f981d93f830 Jeff Layton     2011-05-19  1332                  goto out; 7ee1af765dfa31 Jeremy Allison  2006-08-02  1333          } 7ee1af765dfa31 Jeremy Allison  2006-08-02  1334 d4e4854fd1c85a Pavel Shilovsky 2012-03-23  1335          *pbytes_returned = get_rfc1002_length(midQ->resp_buf); 2c8f981d93f830 Jeff Layton     2011-05-19  1336          memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); afe6f65353b644 Ronnie Sahlberg 2019-08-28  1337          rc = cifs_check_receive(midQ, server, 0); 7ee1af765dfa31 Jeremy Allison  2006-08-02  1338  out: 3c1bf7e48e9e46 Pavel Shilovsky 2012-09-18  1339          cifs_delete_mid(midQ); afe6f65353b644 Ronnie Sahlberg 2019-08-28  1340          add_credits(server, &credits, 0); 7ee1af765dfa31 Jeremy Allison  2006-08-02  1341 7ee1af765dfa31 Jeremy Allison  2006-08-02  1342          return rc; 7ee1af765dfa31 Jeremy Allison  2006-08-02  1343  } 7ee1af765dfa31 Jeremy Allison  2006-08-02  1344 :::::: The code at line 1284 was first introduced by commit :::::: 7ee1af765dfa3146aef958258003245e082284e5 [CIFS] :::::: TO: Jeremy Allison <jra(a)samba.com&gt; :::::: CC: Steve French <sfrench(a)us.ibm.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.01. org%2Fhyperkitty%2Flist%2Fkbuild-all%40lists.01.org&amp;data=02%7C01%7CSte ven.French%40microsoft.com%7C206f157b15804da9dad408d81399862d%7C72f988bf86 f141af91ab2d7cd011db47%7C1%7C0%7C637280897690601647&amp;sdata=8ooAqMhFsu0W PNZHTqniPgiydgShTnlvnHtQMieY3Ao%3D&amp;reserved=0