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From:   Steven French <Steven.French@microsoft.com>
To:     kernel test robot <lkp@intel.com>
CC:     "llvm@lists.linux.dev" <llvm@lists.linux.dev>,
        "oe-kbuild-all@lists.linux.dev" <oe-kbuild-all@lists.linux.dev>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [EXTERNAL] fs/smb/client/sess.c:160:5: warning: stack frame size
 (1152) exceeds limit (1024) in 'cifs_try_adding_channels'
Thread-Topic: [EXTERNAL] fs/smb/client/sess.c:160:5: warning: stack frame size
 (1152) exceeds limit (1024) in 'cifs_try_adding_channels'
Thread-Index: AQHZwBLWbILdzQpn2UWwGHu8Gccq46/M9bnQ
Date:   Thu, 27 Jul 2023 03:36:11 +0000
Message-ID: <DM4PR21MB34413441C9DF320C24F5A84FE401A@DM4PR21MB3441.namprd21.prod.outlook.com>
References: <202307270640.5ODmPwDl-lkp@intel.com>
In-Reply-To: <202307270640.5ODmPwDl-lkp@intel.com>
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Does anyone recognize the problem here - the stack size it is complaining a=
bout has a small stack usage not a large one
     cifs_try_adding_channels   has five pointers and five ints on the stac=
k.  That seems small - not large.  It is called by cifs_mount which doesn't=
 seem too bad in its stack usage either.

Any ideas why the stack size complaint is made?

-----Original Message-----
From: kernel test robot <lkp@intel.com>
Sent: Wednesday, July 26, 2023 5:44 PM
To: Steven French <Steven.French@microsoft.com>
Cc: llvm@lists.linux.dev; oe-kbuild-all@lists.linux.dev; linux-kernel@vger.=
kernel.org
Subject: [EXTERNAL] fs/smb/client/sess.c:160:5: warning: stack frame size (=
1152) exceeds limit (1024) in 'cifs_try_adding_channels'

Hi Steve,

First bad commit (maybe !=3D root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git =
master
head:   0a8db05b571ad5b8d5c8774a004c0424260a90bd
commit: 38c8a9a52082579090e34c033d439ed2cd1a462d smb: move client and serve=
r files to common directory fs/smb
date:   9 weeks ago
config: mips-loongson2k_defconfig (https://download.01.org/0day-ci/archive/=
20230727/202307270640.5ODmPwDl-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a=
5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230727/202307270640.5=
ODmPwDl-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new versio=
n of the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes:
| https://lore/
| .kernel.org%2Foe-kbuild-all%2F202307270640.5ODmPwDl-lkp%40intel.com%2F
| &data=3D05%7C01%7CSteven.French%40microsoft.com%7C2cc584fd937a4cd5b9d008
| db8e29f75b%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C63826008313023
| 4737%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBT
| iI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=3DAauGIxZRPM5DK1J5j6lyEp
| jOkArxfVtIUAnmPcxcCQs%3D&reserved=3D0

All warnings (new ones prefixed by >>):

>> fs/smb/client/sess.c:160:5: warning: stack frame size (1152) exceeds
>> limit (1024) in 'cifs_try_adding_channels' [-Wframe-larger-than]
     160 | int cifs_try_adding_channels(struct cifs_sb_info *cifs_sb, struc=
t cifs_ses *ses)
         |     ^
   1 warning generated.


vim +/cifs_try_adding_channels +160 fs/smb/client/sess.c

b54034a73baf9f fs/cifs/sess.c Shyam Prasad N  2022-01-03  158
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  159  /* returns n=
umber of channels added */ 387ec58f339b0c fs/cifs/sess.c Ronnie Sahlberg 20=
20-12-14 @160  int cifs_try_adding_channels(struct cifs_sb_info *cifs_sb, s=
truct cifs_ses *ses)
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  161  {
90c49fce1c43e1 fs/cifs/sess.c Paulo Alcantara 2023-04-21  162   struct TCP_=
Server_Info *server =3D ses->server;
724244cdb38285 fs/cifs/sess.c Shyam Prasad N  2021-07-19  163   int old_cha=
n_count, new_chan_count;
724244cdb38285 fs/cifs/sess.c Shyam Prasad N  2021-07-19  164   int left;
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  165   int rc =3D =
0;
65a37a34145ca6 fs/cifs/sess.c Aurelien Aptel  2019-11-20  166   int tries =
=3D 0;
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  167   struct cifs=
_server_iface *iface =3D NULL, *niface =3D NULL;
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  168
724244cdb38285 fs/cifs/sess.c Shyam Prasad N  2021-07-19  169   spin_lock(&=
ses->chan_lock);
724244cdb38285 fs/cifs/sess.c Shyam Prasad N  2021-07-19  170
724244cdb38285 fs/cifs/sess.c Shyam Prasad N  2021-07-19  171   new_chan_co=
unt =3D old_chan_count =3D ses->chan_count;
724244cdb38285 fs/cifs/sess.c Shyam Prasad N  2021-07-19  172   left =3D se=
s->chan_max - ses->chan_count;
724244cdb38285 fs/cifs/sess.c Shyam Prasad N  2021-07-19  173
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  174   if (left <=
=3D 0) {
88b024f556fcd5 fs/cifs/sess.c Shyam Prasad N  2021-11-19  175           spi=
n_unlock(&ses->chan_lock);
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  176           cif=
s_dbg(FYI,
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  177              =
      "ses already at max_channels (%zu), nothing to open\n",
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  178              =
      ses->chan_max);
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  179           ret=
urn 0;
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  180   }
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  181
90c49fce1c43e1 fs/cifs/sess.c Paulo Alcantara 2023-04-21  182   if (server-=
>dialect < SMB30_PROT_ID) {
53923e0fe2098f fs/cifs/sess.c Steve French    2022-02-16  183           spi=
n_unlock(&ses->chan_lock);
53923e0fe2098f fs/cifs/sess.c Steve French    2022-02-16  184           cif=
s_dbg(VFS, "multichannel is not supported on this protocol version, use 3.0=
 or above\n");
53923e0fe2098f fs/cifs/sess.c Steve French    2022-02-16  185           ret=
urn 0;
53923e0fe2098f fs/cifs/sess.c Steve French    2022-02-16  186   }
53923e0fe2098f fs/cifs/sess.c Steve French    2022-02-16  187
90c49fce1c43e1 fs/cifs/sess.c Paulo Alcantara 2023-04-21  188   if (!(serve=
r->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
9c2dc11df50d1c fs/cifs/sess.c Steve French    2021-05-07  189           ses=
->chan_max =3D 1;
724244cdb38285 fs/cifs/sess.c Shyam Prasad N  2021-07-19  190           spi=
n_unlock(&ses->chan_lock);
90c49fce1c43e1 fs/cifs/sess.c Paulo Alcantara 2023-04-21  191           cif=
s_server_dbg(VFS, "no multichannel support\n");
9c2dc11df50d1c fs/cifs/sess.c Steve French    2021-05-07  192           ret=
urn 0;
9c2dc11df50d1c fs/cifs/sess.c Steve French    2021-05-07  193   }
724244cdb38285 fs/cifs/sess.c Shyam Prasad N  2021-07-19  194   spin_unlock=
(&ses->chan_lock);
9c2dc11df50d1c fs/cifs/sess.c Steve French    2021-05-07  195
65a37a34145ca6 fs/cifs/sess.c Aurelien Aptel  2019-11-20  196   /*
65a37a34145ca6 fs/cifs/sess.c Aurelien Aptel  2019-11-20  197    * Keep con=
necting to same, fastest, iface for all channels as
65a37a34145ca6 fs/cifs/sess.c Aurelien Aptel  2019-11-20  198    * long as =
its RSS. Try next fastest one if not RSS or channel
65a37a34145ca6 fs/cifs/sess.c Aurelien Aptel  2019-11-20  199    * creation=
 fails.
65a37a34145ca6 fs/cifs/sess.c Aurelien Aptel  2019-11-20  200    */
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  201   spin_lock(&=
ses->iface_lock);
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  202   iface =3D l=
ist_first_entry(&ses->iface_list, struct cifs_server_iface,
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  203              =
              iface_head);
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  204   spin_unlock=
(&ses->iface_lock);
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  205
65a37a34145ca6 fs/cifs/sess.c Aurelien Aptel  2019-11-20  206   while (left=
 > 0) {
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  207
65a37a34145ca6 fs/cifs/sess.c Aurelien Aptel  2019-11-20  208           tri=
es++;
65a37a34145ca6 fs/cifs/sess.c Aurelien Aptel  2019-11-20  209           if =
(tries > 3*ses->chan_max) {
bbbf9eafbfdaa2 fs/cifs/sess.c Steve French    2020-05-30  210              =
     cifs_dbg(FYI, "too many channel open attempts (%d channels left to ope=
n)\n",
65a37a34145ca6 fs/cifs/sess.c Aurelien Aptel  2019-11-20  211              =
              left);
65a37a34145ca6 fs/cifs/sess.c Aurelien Aptel  2019-11-20  212              =
     break;
65a37a34145ca6 fs/cifs/sess.c Aurelien Aptel  2019-11-20  213           }
65a37a34145ca6 fs/cifs/sess.c Aurelien Aptel  2019-11-20  214
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  215           spi=
n_lock(&ses->iface_lock);
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  216           if =
(!ses->iface_count) {
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  217              =
     spin_unlock(&ses->iface_lock);
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  218              =
     break;
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  219           }
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  220
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  221           lis=
t_for_each_entry_safe_from(iface, niface, &ses->iface_list,
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  222              =
                 iface_head) {
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  223              =
     /* skip ifaces that are unusable */
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  224              =
     if (!iface->is_active ||
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  225              =
         (is_ses_using_iface(ses, iface) &&
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  226              =
          !iface->rss_capable)) {
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  227              =
             continue;
65a37a34145ca6 fs/cifs/sess.c Aurelien Aptel  2019-11-20  228              =
     }
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  229
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  230              =
     /* take ref before unlock */
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  231              =
     kref_get(&iface->refcount);
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  232
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  233              =
     spin_unlock(&ses->iface_lock);
387ec58f339b0c fs/cifs/sess.c Ronnie Sahlberg 2020-12-14  234              =
     rc =3D cifs_ses_add_channel(cifs_sb, ses, iface);
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  235              =
     spin_lock(&ses->iface_lock);
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  236
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  237              =
     if (rc) {
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  238              =
             cifs_dbg(VFS, "failed to open extra channel on iface:%pIS rc=
=3D%d\n",
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  239              =
                      &iface->sockaddr,
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  240              =
                      rc);
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  241              =
             kref_put(&iface->refcount, release_iface);
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  242              =
             continue;
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  243              =
     }
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  244
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  245              =
     cifs_dbg(FYI, "successfully opened new channel on iface:%pIS\n",
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  246              =
              &iface->sockaddr);
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  247              =
     break;
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  248           }
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  249           spi=
n_unlock(&ses->iface_lock);
aa45dadd34e44f fs/cifs/sess.c Shyam Prasad N  2022-01-01  250
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  251           lef=
t--;
724244cdb38285 fs/cifs/sess.c Shyam Prasad N  2021-07-19  252           new=
_chan_count++;
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  253   }
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  254
724244cdb38285 fs/cifs/sess.c Shyam Prasad N  2021-07-19  255   return new_=
chan_count - old_chan_count;
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  256  }
d70e9fa5588476 fs/cifs/sess.c Aurelien Aptel  2019-09-20  257

:::::: The code at line 160 was first introduced by commit
:::::: 387ec58f339b0c45e3767395f11fa8dd3772131e cifs: simplify handling of =
cifs_sb/ctx->local_nls

:::::: TO: Ronnie Sahlberg <lsahlber@redhat.com>
:::::: CC: Steve French <stfrench@microsoft.com>

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki