tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git pending-5.15 head: c8020bc325ff1e12d98d1aa70b77afb4f40e1c5e commit: 366646dc932a8ee5dea1a71dad1f6e06ea28ac40 [125/134] net: dsa: fix panic when DSA master device unbinds on shutdown config: sparc-randconfig-m031-20220213 (https://download.01.org/0day-ci/archive/20220213/202202131427.SK7CctaU-lk...) compiler: sparc-linux-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-stable pending-5.15 git checkout 366646dc932a8ee5dea1a71dad1f6e06ea28ac40 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=sparc SHELL=/bin/bash net/dsa/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): net/dsa/dsa2.c: In function 'dsa_switch_shutdown': 1650 | dsa_switch_for_each_cpu_port(dp, ds) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ | dsa_switch_touch_ports 1650 | dsa_switch_for_each_cpu_port(dp, ds) | ^ | ; 1651 | dp->master->dsa_ptr = NULL; | ~~ cc1: some warnings being treated as errors vim +1650 net/dsa/dsa2.c 1620 1621 /* If the DSA master chooses to unregister its net_device on .shutdown, DSA is 1622 * blocking that operation from completion, due to the dev_hold taken inside 1623 * netdev_upper_dev_link. Unlink the DSA slave interfaces from being uppers of 1624 * the DSA master, so that the system can reboot successfully. 1625 */ 1626 void dsa_switch_shutdown(struct dsa_switch *ds) 1627 { 1628 struct net_device *master, *slave_dev; 1629 struct dsa_port *dp; 1630 1631 mutex_lock(&dsa2_mutex); 1632 rtnl_lock(); 1633 1634 list_for_each_entry(dp, &ds->dst->ports, list) { 1635 if (dp->ds != ds) 1636 continue; 1637 1638 if (!dsa_port_is_user(dp)) 1639 continue; 1640 1641 master = dp->cpu_dp->master; 1642 slave_dev = dp->slave; 1643 1644 netdev_upper_dev_unlink(master, slave_dev); 1645 } 1646 1647 /* Disconnect from further netdevice notifiers on the master, 1648 * since netdev_uses_dsa() will now return false. 1649 */ --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org