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Date: Fri, 23 Jun 2023 02:25:05 +0800
From: kernel test robot <lkp@...el.com>
To: Lin Ma <linma@....edu.cn>, krzysztof.kozlowski@...aro.org,
avem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
pabeni@...hat.com, netdev@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, Lin Ma <linma@....edu.cn>
Subject: Re: [PATCH v2] net: nfc: Fix use-after-free caused by
nfc_llcp_find_local
Hi Lin,
kernel test robot noticed the following build warnings:
[auto build test WARNING on net/main]
[also build test WARNING on net-next/main linus/master horms-ipvs/master v6.4-rc7 next-20230622]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Lin-Ma/net-nfc-Fix-use-after-free-caused-by-nfc_llcp_find_local/20230622-230631
base: net/main
patch link: https://lore.kernel.org/r/20230622150331.1242706-1-linma%40zju.edu.cn
patch subject: [PATCH v2] net: nfc: Fix use-after-free caused by nfc_llcp_find_local
config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20230623/202306230247.UPcyNhPl-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230623/202306230247.UPcyNhPl-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306230247.UPcyNhPl-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> net/nfc/llcp_core.c:146:24: warning: no previous prototype for 'nfc_llcp_local_get' [-Wmissing-prototypes]
146 | struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
| ^~~~~~~~~~~~~~~~~~
>> net/nfc/llcp_core.c:299:24: warning: no previous prototype for 'nfc_llcp_remove_local' [-Wmissing-prototypes]
299 | struct nfc_llcp_local *nfc_llcp_remove_local(struct nfc_dev *dev)
| ^~~~~~~~~~~~~~~~~~~~~
vim +/nfc_llcp_local_get +146 net/nfc/llcp_core.c
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 145
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 @146 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 147 {
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 148 kref_get(&local->ref);
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 149
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 150 return local;
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 151 }
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 152
c470e319b48bf1 net/nfc/llcp/llcp.c Samuel Ortiz 2013-04-03 153 static void local_cleanup(struct nfc_llcp_local *local)
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 154 {
c470e319b48bf1 net/nfc/llcp/llcp.c Samuel Ortiz 2013-04-03 155 nfc_llcp_socket_release(local, false, ENXIO);
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 156 del_timer_sync(&local->link_timer);
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 157 skb_queue_purge(&local->tx_queue);
474fee3db16c63 net/nfc/llcp/llcp.c Tejun Heo 2012-08-22 158 cancel_work_sync(&local->tx_work);
474fee3db16c63 net/nfc/llcp/llcp.c Tejun Heo 2012-08-22 159 cancel_work_sync(&local->rx_work);
474fee3db16c63 net/nfc/llcp/llcp.c Tejun Heo 2012-08-22 160 cancel_work_sync(&local->timeout_work);
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 161 kfree_skb(local->rx_pending);
4bb4db7f3187c6 net/nfc/llcp_core.c Jisoo Jang 2023-01-11 162 local->rx_pending = NULL;
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 163 del_timer_sync(&local->sdreq_timer);
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 164 cancel_work_sync(&local->sdreq_timeout_work);
d9b8d8e19b0730 net/nfc/llcp/llcp.c Thierry Escande 2013-02-15 165 nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
3536da06db0baa net/nfc/llcp/llcp.c Samuel Ortiz 2013-02-21 166 }
3536da06db0baa net/nfc/llcp/llcp.c Samuel Ortiz 2013-02-21 167
3536da06db0baa net/nfc/llcp/llcp.c Samuel Ortiz 2013-02-21 168 static void local_release(struct kref *ref)
3536da06db0baa net/nfc/llcp/llcp.c Samuel Ortiz 2013-02-21 169 {
3536da06db0baa net/nfc/llcp/llcp.c Samuel Ortiz 2013-02-21 170 struct nfc_llcp_local *local;
3536da06db0baa net/nfc/llcp/llcp.c Samuel Ortiz 2013-02-21 171
3536da06db0baa net/nfc/llcp/llcp.c Samuel Ortiz 2013-02-21 172 local = container_of(ref, struct nfc_llcp_local, ref);
3536da06db0baa net/nfc/llcp/llcp.c Samuel Ortiz 2013-02-21 173
c470e319b48bf1 net/nfc/llcp/llcp.c Samuel Ortiz 2013-04-03 174 local_cleanup(local);
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 175 kfree(local);
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 176 }
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 177
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 178 int nfc_llcp_local_put(struct nfc_llcp_local *local)
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 179 {
a69f32af86e389 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 180 if (local == NULL)
a69f32af86e389 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 181 return 0;
a69f32af86e389 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 182
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 183 return kref_put(&local->ref, local_release);
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 184 }
c7aa12252f5142 net/nfc/llcp/llcp.c Samuel Ortiz 2012-05-04 185
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 186 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 187 u8 ssap, u8 dsap)
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 188 {
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 189 struct sock *sk;
a8df0f379213f1 net/nfc/llcp/llcp.c Samuel Ortiz 2012-10-16 190 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 191
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 192 pr_debug("ssap dsap %d %d\n", ssap, dsap);
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 193
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 194 if (ssap == 0 && dsap == 0)
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 195 return NULL;
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 196
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 197 read_lock(&local->sockets.lock);
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 198
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 199 llcp_sock = NULL;
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 200
b67bfe0d42cac5 net/nfc/llcp/llcp.c Sasha Levin 2013-02-27 201 sk_for_each(sk, &local->sockets.head) {
a8df0f379213f1 net/nfc/llcp/llcp.c Samuel Ortiz 2012-10-16 202 tmp_sock = nfc_llcp_sock(sk);
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 203
a8df0f379213f1 net/nfc/llcp/llcp.c Samuel Ortiz 2012-10-16 204 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
a8df0f379213f1 net/nfc/llcp/llcp.c Samuel Ortiz 2012-10-16 205 llcp_sock = tmp_sock;
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 206 break;
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 207 }
a8df0f379213f1 net/nfc/llcp/llcp.c Samuel Ortiz 2012-10-16 208 }
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 209
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 210 read_unlock(&local->sockets.lock);
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 211
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 212 if (llcp_sock == NULL)
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 213 return NULL;
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 214
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 215 sock_hold(&llcp_sock->sk);
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 216
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 217 return llcp_sock;
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 218 }
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 219
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 220 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 221 {
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 222 sock_put(&sock->sk);
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 223 }
8f50020ed9b81b net/nfc/llcp/llcp.c Samuel Ortiz 2012-06-25 224
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 225 static void nfc_llcp_timeout_work(struct work_struct *work)
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 226 {
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 227 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 228 timeout_work);
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 229
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 230 nfc_dep_link_down(local->dev);
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 231 }
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 232
4b519bb493e086 net/nfc/llcp_core.c Allen Pais 2017-10-11 233 static void nfc_llcp_symm_timer(struct timer_list *t)
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 234 {
4b519bb493e086 net/nfc/llcp_core.c Allen Pais 2017-10-11 235 struct nfc_llcp_local *local = from_timer(local, t, link_timer);
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 236
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 237 pr_err("SYMM timeout\n");
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 238
916082b073ebb7 net/nfc/llcp/llcp.c Linus Torvalds 2012-10-02 239 schedule_work(&local->timeout_work);
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 240 }
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 241
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 242 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 243 {
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 244 unsigned long time;
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 245 HLIST_HEAD(nl_sdres_list);
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 246 struct hlist_node *n;
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 247 struct nfc_llcp_sdp_tlv *sdp;
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 248 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 249 sdreq_timeout_work);
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 250
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 251 mutex_lock(&local->sdreq_lock);
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 252
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 253 time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 254
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 255 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 256 if (time_after(sdp->time, time))
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 257 continue;
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 258
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 259 sdp->sap = LLCP_SDP_UNBOUND;
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 260
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 261 hlist_del(&sdp->node);
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 262
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 263 hlist_add_head(&sdp->node, &nl_sdres_list);
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 264 }
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 265
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 266 if (!hlist_empty(&local->pending_sdreqs))
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 267 mod_timer(&local->sdreq_timer,
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 268 jiffies + msecs_to_jiffies(3 * local->remote_lto));
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 269
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 270 mutex_unlock(&local->sdreq_lock);
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 271
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 272 if (!hlist_empty(&nl_sdres_list))
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 273 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 274 }
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 275
4b519bb493e086 net/nfc/llcp_core.c Allen Pais 2017-10-11 276 static void nfc_llcp_sdreq_timer(struct timer_list *t)
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 277 {
4b519bb493e086 net/nfc/llcp_core.c Allen Pais 2017-10-11 278 struct nfc_llcp_local *local = from_timer(local, t, sdreq_timer);
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 279
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 280 schedule_work(&local->sdreq_timeout_work);
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 281 }
40213fa8513c2a net/nfc/llcp/llcp.c Thierry Escande 2013-03-04 282
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 283 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 284 {
29e27dd86b5c4f net/nfc/llcp_core.c Axel Lin 2014-02-26 285 struct nfc_llcp_local *local;
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 286 struct nfc_llcp_local *res = NULL;
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 287
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 288 spin_lock(&llcp_devices_lock);
29e27dd86b5c4f net/nfc/llcp_core.c Axel Lin 2014-02-26 289 list_for_each_entry(local, &llcp_devices, list)
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 290 if (local->dev == dev) {
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 291 res = nfc_llcp_local_get(local);
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 292 break;
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 293 }
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 294 spin_unlock(&llcp_devices_lock);
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 295
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 296 return res;
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 297 }
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 298
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 @299 struct nfc_llcp_local *nfc_llcp_remove_local(struct nfc_dev *dev)
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 300 {
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 301 struct nfc_llcp_local *local, *tmp;
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 302
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 303 spin_lock(&llcp_devices_lock);
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 304 list_for_each_entry_safe(local, tmp, &llcp_devices, list)
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 305 if (local->dev == dev) {
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 306 list_del(&local->list);
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 307 spin_unlock(&llcp_devices_lock);
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 308 return local;
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 309 }
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 310 spin_unlock(&llcp_devices_lock);
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 311
972f46a30da575 net/nfc/llcp_core.c Lin Ma 2023-06-22 312 pr_warn("Shutting down device not found\n");
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 313
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 314 return NULL;
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 315 }
d646960f7986fe net/nfc/llcp/llcp.c Samuel Ortiz 2011-12-14 316
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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