From: kernel test robot <lkp@intel.com>
To: Jeff Layton <jlayton@kernel.org>
Cc: oe-kbuild-all@lists.linux.dev, Chuck Lever <cel@kernel.org>
Subject: [cel:nfsd-testing 106/120] include/linux/netlink.h:116:13: warning: ' listener; rpcbind did not a...' directive output truncated writing 79 bytes into a region of size 66
Date: Wed, 02 Sep 2026 21:32:31 +0200 [thread overview]
Message-ID: <202609022140.suMcguXp-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/cel/linux nfsd-testing
head: ac579868af0c900d8fd9c8cfe9e10db46ccc5a75
commit: ce39bbabbe205b50b66ac935bd54036d86d86ba3 [106/120] NFSD: stop registering with rpcbind after a failure in listener_set
config: alpha-allmodconfig (https://download.01.org/0day-ci/archive/20260902/202609022140.suMcguXp-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260902/202609022140.suMcguXp-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202609022140.suMcguXp-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from include/uapi/linux/neighbour.h:6,
from include/linux/netdevice.h:44,
from include/net/sock.h:46,
from include/linux/tcp.h:19,
from include/linux/ipv6.h:103,
from include/net/ipv6.h:12,
from include/linux/sunrpc/clnt.h:29,
from include/linux/sunrpc/svcauth.h:17,
from include/linux/sunrpc/svc.h:19,
from include/linux/sunrpc/svcsock.h:13,
from fs/nfsd/nfsctl.c:14:
fs/nfsd/nfsctl.c: In function 'nfsd_nl_listener_set_doit':
>> include/linux/netlink.h:116:13: warning: ' listener; rpcbind did not a...' directive output truncated writing 79 bytes into a region of size 66 [-Wformat-truncation=]
116 | if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
117 | "%s" fmt "%s", "", ##args, "") >= \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/nfsd/nfsctl.c:2253:25: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
2253 | NL_SET_ERR_MSG_FMT(info->extack,
| ^~~~~~~~~~~~~~~~~~
include/linux/netlink.h:116:13: note: 'snprintf' output 94 or more bytes into a destination of size 80
116 | if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
117 | "%s" fmt "%s", "", ##args, "") >= \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/nfsd/nfsctl.c:2253:25: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
2253 | NL_SET_ERR_MSG_FMT(info->extack,
| ^~~~~~~~~~~~~~~~~~
--
In file included from include/uapi/linux/neighbour.h:6,
from include/linux/netdevice.h:44,
from include/net/sock.h:46,
from include/linux/tcp.h:19,
from include/linux/ipv6.h:103,
from include/net/ipv6.h:12,
from include/linux/sunrpc/clnt.h:29,
from include/linux/sunrpc/svcauth.h:17,
from include/linux/sunrpc/svc.h:19,
from include/linux/sunrpc/svcsock.h:13,
from nfsctl.c:14:
nfsctl.c: In function 'nfsd_nl_listener_set_doit':
>> include/linux/netlink.h:116:13: warning: ' listener; rpcbind did not a...' directive output truncated writing 79 bytes into a region of size 66 [-Wformat-truncation=]
116 | if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
117 | "%s" fmt "%s", "", ##args, "") >= \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
nfsctl.c:2253:25: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
2253 | NL_SET_ERR_MSG_FMT(info->extack,
| ^~~~~~~~~~~~~~~~~~
include/linux/netlink.h:116:13: note: 'snprintf' output 94 or more bytes into a destination of size 80
116 | if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
117 | "%s" fmt "%s", "", ##args, "") >= \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
nfsctl.c:2253:25: note: in expansion of macro 'NL_SET_ERR_MSG_FMT'
2253 | NL_SET_ERR_MSG_FMT(info->extack,
| ^~~~~~~~~~~~~~~~~~
vim +116 include/linux/netlink.h
2d4bc93368f5a0 Johannes Berg 2017-04-12 107
51c352bdbcd23d Edward Cree 2022-10-18 108 /* We splice fmt with %s at each end even in the snprintf so that both calls
51c352bdbcd23d Edward Cree 2022-10-18 109 * can use the same string constant, avoiding its duplication in .ro
51c352bdbcd23d Edward Cree 2022-10-18 110 */
51c352bdbcd23d Edward Cree 2022-10-18 111 #define NL_SET_ERR_MSG_FMT(extack, fmt, args...) do { \
51c352bdbcd23d Edward Cree 2022-10-18 112 struct netlink_ext_ack *__extack = (extack); \
51c352bdbcd23d Edward Cree 2022-10-18 113 \
51c352bdbcd23d Edward Cree 2022-10-18 114 if (!__extack) \
51c352bdbcd23d Edward Cree 2022-10-18 115 break; \
51c352bdbcd23d Edward Cree 2022-10-18 @116 if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
51c352bdbcd23d Edward Cree 2022-10-18 117 "%s" fmt "%s", "", ##args, "") >= \
51c352bdbcd23d Edward Cree 2022-10-18 118 NETLINK_MAX_FMTMSG_LEN) \
51c352bdbcd23d Edward Cree 2022-10-18 119 net_warn_ratelimited("%s" fmt "%s", "truncated extack: ", \
51c352bdbcd23d Edward Cree 2022-10-18 120 ##args, "\n"); \
51c352bdbcd23d Edward Cree 2022-10-18 121 \
51c352bdbcd23d Edward Cree 2022-10-18 122 do_trace_netlink_extack(__extack->_msg_buf); \
51c352bdbcd23d Edward Cree 2022-10-18 123 \
51c352bdbcd23d Edward Cree 2022-10-18 124 __extack->_msg = __extack->_msg_buf; \
51c352bdbcd23d Edward Cree 2022-10-18 125 } while (0)
51c352bdbcd23d Edward Cree 2022-10-18 126
:::::: The code at line 116 was first introduced by commit
:::::: 51c352bdbcd23d7ce46b06c1e64c82754dc44044 netlink: add support for formatted extack messages
:::::: TO: Edward Cree <ecree.xilinx@gmail.com>
:::::: CC: Jakub Kicinski <kuba@kernel.org>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
reply other threads:[~2026-09-02 19:33 UTC|newest]
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