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SubjectERROR: modpost: ".__dev_get_by_index" undefined!
Hi Xin,

First bad commit (maybe != root cause):

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 0e9bcda5d286f4a26a5407bb38f55c55b453ecfb
commit: 4ef1a7cb08e94da1f2f2a34ee6cefe7ae142dc98 ipv6: some fixes for ipv6_dev_find()
date: 6 months ago
config: powerpc64-randconfig-c003-20210130 (attached as .config)
compiler: powerpc64-linux-gcc (GCC) 9.3.0
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/torvalds/linux.git/commit/?id=4ef1a7cb08e94da1f2f2a34ee6cefe7ae142dc98
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 4ef1a7cb08e94da1f2f2a34ee6cefe7ae142dc98
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>, old ones prefixed by <<):

ERROR: modpost: ".kernel_write" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".trace_seq_printf" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".kmem_cache_alloc" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".idr_alloc_u32" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".sock_alloc_file" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".kernel_read" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".printk" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".trace_event_ignore_this_pid" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".__list_del_entry_valid" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".trace_print_symbols_seq" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".remove_wait_queue" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".__stack_chk_fail" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".__sanitizer_cov_trace_const_cmp4" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".fget" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".make_kuid" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".strcmp" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".match_int" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".dump_stack" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".trace_handle_return" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".kmem_cache_destroy" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".match_strdup" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".recalc_sigpending" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".idr_find" [net/9p/9pnet.ko] undefined!
ERROR: modpost: ".cancel_delayed_work_sync" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: "._raw_spin_unlock_irqrestore" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__warn_printk" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".input_open_device" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".mod_delayed_work_on" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__sanitizer_cov_trace_cmp4" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".kmem_cache_alloc_trace" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".device_add" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__mutex_init" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".input_close_device" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".strlen" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".led_trigger_register" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: "._copy_to_user" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".init_timer_key" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".input_register_handle" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__sanitizer_cov_trace_cmp1" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".capable" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".cancel_work_sync" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__init_waitqueue_head" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".stream_open" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__sanitizer_cov_trace_const_cmp8" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".queue_delayed_work_on" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__class_register" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".finish_wait" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".kstrtoull" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".led_trigger_unregister" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".mutex_lock" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".sprintf" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".class_unregister" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__kmalloc" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".arch_local_irq_restore" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".input_register_handler" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".prepare_to_wait_event" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: "._raw_spin_lock_irq" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__list_add_valid" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".add_uevent_var" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__sanitizer_cov_trace_switch" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__sanitizer_cov_trace_const_cmp2" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__sanitizer_cov_trace_pc" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".device_initialize" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".input_unregister_handler" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".schedule" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__sanitizer_cov_trace_const_cmp1" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".dev_set_name" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".device_del" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".kobject_uevent" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: "._raw_spin_lock_irqsave" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".misc_register" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__check_object_size" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".init_wait_entry" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".strcpy" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".led_trigger_event" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".queue_work_on" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__wake_up" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".printk" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".misc_deregister" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__list_del_entry_valid" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".input_unregister_handle" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__stack_chk_fail" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".__sanitizer_cov_trace_const_cmp4" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".mutex_unlock" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".strcmp" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".round_jiffies_relative" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: "._copy_from_user" [net/rfkill/rfkill.ko] undefined!
ERROR: modpost: ".skb_queue_purge" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".dst_cache_set_ip4" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".event_triggers_call" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".skb_clone" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".sg_init_table" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".netlink_net_capable" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".register_netdevice_notifier" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".__warn_printk" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".del_timer_sync" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".rb_first_postorder" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".__sanitizer_cov_trace_cmp4" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".__nlmsg_put" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".kmem_cache_alloc_trace" [net/tipc/tipc.ko] undefined!
>> ERROR: modpost: ".__dev_get_by_index" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".consume_skb" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".security_sk_clone" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".udp_tunnel_sock_release" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".rhashtable_walk_start_check" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".mod_timer" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".snprintf" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".register_pernet_subsys" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".udp_sock_create6" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".netdev_warn" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".sk_reset_timer" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".__ipv6_addr_type" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".release_sock" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".strlen" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".free_percpu" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".kfree_skb_partial" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".iov_iter_kvec" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".genl_unregister_family" [net/tipc/tipc.ko] undefined!
ERROR: modpost: "._copy_from_iter" [net/tipc/tipc.ko] undefined!
ERROR: modpost: "._copy_to_user" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".destroy_workqueue" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".init_timer_key" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".rht_bucket_nested_insert" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".nla_memcpy" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".unregister_netdevice_notifier" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".setup_udp_tunnel_sock" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".rhashtable_walk_exit" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".udp_tunnel6_xmit_skb" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".kfree_skb" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".schedule_timeout" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".__sanitizer_cov_trace_cmp8" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".sock_unregister" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".__sanitizer_cov_trace_cmp1" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".rhashtable_init" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".__alloc_percpu" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".sock_recvmsg" [net/tipc/tipc.ko] undefined!
ERROR: modpost: "._raw_read_lock_bh" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".cpumask_next" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".memcmp" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".refcount_warn_saturate" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".lock_sock_nested" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".crypto_aead_decrypt" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".kernel_accept" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".sk_stop_timer" [net/tipc/tipc.ko] undefined!
ERROR: modpost: "._raw_spin_lock_bh" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".from_kuid_munged" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".strchr" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".synchronize_net" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".__sanitizer_cov_trace_const_cmp8" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".unregister_pernet_device" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".idr_alloc" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".kernel_bind" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".__pskb_copy_fclone" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".rhashtable_walk_stop" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".finish_wait" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".__nla_parse" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".sock_i_uid" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".skb_trim" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".proto_unregister" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".rhashtable_walk_next" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".call_rcu" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".strstr" [net/tipc/tipc.ko] undefined!
ERROR: modpost: "._raw_write_lock_bh" [net/tipc/tipc.ko] undefined!
ERROR: modpost: "._raw_read_unlock_bh" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".skb_push" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".strscpy" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".genl_register_family" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".sprintf" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".rhashtable_destroy" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".dst_cache_get" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".kfree_sensitive" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".__msecs_to_jiffies" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".unregister_pernet_subsys" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".skb_put" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".sock_register" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".dst_cache_init" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".rb_first" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".ip_route_output_flow" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".crypto_destroy_tfm" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".__kmalloc" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".nla_put_64bit" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".arch_local_irq_restore" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".wait_woken" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".trace_output_call" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".skb_copy_expand" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".rht_bucket_nested" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".genlmsg_put" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".ip6_dst_hoplimit" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".kernel_sendmsg" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".strrchr" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".rhashtable_insert_slow" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".nla_put" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".register_pernet_device" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".sock_i_ino" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".idr_destroy" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".__list_add_valid" [net/tipc/tipc.ko] undefined!
ERROR: modpost: "._raw_spin_lock" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".list_sort" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".__sanitizer_cov_trace_switch" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".strncpy" [net/tipc/tipc.ko] undefined!
ERROR: modpost: ".scnprintf" [net/tipc/tipc.ko] undefined!

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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