bisecting cause commit starting from 2019fc96af228b412bdb2e8e0ad4b1fc12046a51 building syzkaller on 5d7b90f1af2e3bf33992b75e7fcf0bab6bf49bd6 testing commit 2019fc96af228b412bdb2e8e0ad4b1fc12046a51 with gcc (GCC) 8.1.0 kernel signature: 32fffc6bc2e1a2059bb9f8a3933cfbe43f1df48f74a8771628839b6eba634958 run #0: crashed: KASAN: use-after-free Read in find_match run #1: crashed: KASAN: use-after-free Read in find_match run #2: crashed: KASAN: use-after-free Read in find_match run #3: crashed: KASAN: use-after-free Read in find_match run #4: crashed: KASAN: use-after-free Read in find_match run #5: crashed: KASAN: use-after-free Read in ipv6_get_ifaddr run #6: crashed: KASAN: use-after-free Read in find_match run #7: crashed: KASAN: use-after-free Read in find_match run #8: crashed: KASAN: use-after-free Read in find_match run #9: crashed: KASAN: use-after-free Read in find_match testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0 kernel signature: 6e6e08653c79ace0dce7f616d4ada54d655d0c2ed26b159fd3fd074713eb8eda run #0: crashed: KASAN: use-after-free Read in find_match run #1: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #2: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #3: crashed: KASAN: use-after-free Read in find_match run #4: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #5: crashed: KASAN: use-after-free Read in find_match run #6: crashed: KASAN: use-after-free Read in ipv6_get_lladdr run #7: crashed: KASAN: use-after-free Read in find_match run #8: crashed: KASAN: use-after-free Read in ipv6_get_lladdr run #9: crashed: KASAN: use-after-free Read in find_match testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: c2ca442db944ddbd120cf811460af68821ac479229db0ecc4d92ee90521e9580 all runs: OK # git bisect start d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 219d54332a09e8d8741c1e1982f5eae56099de85 Bisecting: 8639 revisions left to test after this (roughly 13 steps) [8c39f71ee2019e77ee14f88b1321b2348db51820] Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net testing commit 8c39f71ee2019e77ee14f88b1321b2348db51820 with gcc (GCC) 8.1.0 kernel signature: a43c8725180a52dd3f190e7f230b3f98d4686a0df5389cfb00500b9dbdb0596d run #0: crashed: KASAN: use-after-free Read in find_match run #1: crashed: KASAN: use-after-free Read in find_match run #2: crashed: KASAN: use-after-free Read in find_match run #3: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #4: crashed: KASAN: use-after-free Read in find_match run #5: crashed: KASAN: use-after-free Read in find_match run #6: crashed: KASAN: use-after-free Read in ipv6_get_lladdr run #7: crashed: KASAN: use-after-free Read in find_match run #8: crashed: KASAN: use-after-free Read in find_match run #9: crashed: KASAN: use-after-free Read in find_match # git bisect bad 8c39f71ee2019e77ee14f88b1321b2348db51820 Bisecting: 3435 revisions left to test after this (roughly 12 steps) [3b397c7ccafe0624018cb09fc96729f8f6165573] Merge tag 'regmap-v5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap testing commit 3b397c7ccafe0624018cb09fc96729f8f6165573 with gcc (GCC) 8.1.0 kernel signature: 78e3f90257a9a0256d4e1c5fe184a9588a4ac8c496882dc575012216679aeb98 run #0: crashed: KASAN: use-after-free Read in find_match run #1: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #2: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #3: crashed: KASAN: use-after-free Read in find_match run #4: crashed: KASAN: use-after-free Read in find_match run #5: crashed: KASAN: use-after-free Read in find_match run #6: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #7: crashed: KASAN: use-after-free Read in ipv6_get_lladdr run #8: crashed: KASAN: use-after-free Read in find_match run #9: crashed: KASAN: use-after-free Read in find_match # git bisect bad 3b397c7ccafe0624018cb09fc96729f8f6165573 Bisecting: 1709 revisions left to test after this (roughly 11 steps) [924ea58dadea23cc28b60d02b9c0896b7b168a6f] Merge tag 'mt76-for-kvalo-2019-11-20' of https://github.com/nbd168/wireless testing commit 924ea58dadea23cc28b60d02b9c0896b7b168a6f with gcc (GCC) 8.1.0 kernel signature: d5cc73d24439e2cc4d2ae1fe12dbeda059c84d72e05307b64d1301e54b9231a4 run #0: crashed: KASAN: use-after-free Read in find_match run #1: crashed: KASAN: use-after-free Read in find_match run #2: crashed: KASAN: use-after-free Read in find_match run #3: crashed: KASAN: use-after-free Read in find_match run #4: crashed: KASAN: use-after-free Read in find_match run #5: crashed: KASAN: use-after-free Read in ipv6_get_lladdr run #6: crashed: KASAN: use-after-free Read in find_match run #7: crashed: KASAN: use-after-free Read in find_match run #8: crashed: KASAN: use-after-free Read in find_match run #9: crashed: KASAN: use-after-free Read in find_match # git bisect bad 924ea58dadea23cc28b60d02b9c0896b7b168a6f Bisecting: 855 revisions left to test after this (roughly 10 steps) [3b7ad08b5153b0eda2f4d57ac53d815c30acd172] vsock: Simplify '__vsock_release()' testing commit 3b7ad08b5153b0eda2f4d57ac53d815c30acd172 with gcc (GCC) 8.1.0 kernel signature: dc0f8e9e58a76c89d5a568b2d69c4c27bcd9a7a2f59b38290fad93d0498b7dfc run #0: crashed: KASAN: use-after-free Read in find_match run #1: crashed: KASAN: use-after-free Read in ipv6_get_ifaddr run #2: crashed: KASAN: use-after-free Read in find_match run #3: crashed: KASAN: use-after-free Read in find_match run #4: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #5: crashed: KASAN: use-after-free Read in find_match run #6: crashed: KASAN: use-after-free Read in ipv6_add_addr run #7: crashed: KASAN: use-after-free Read in find_match run #8: crashed: KASAN: use-after-free Read in ip6_dst_destroy run #9: crashed: KASAN: use-after-free Read in find_match # git bisect bad 3b7ad08b5153b0eda2f4d57ac53d815c30acd172 Bisecting: 427 revisions left to test after this (roughly 9 steps) [a3e09ded6a6d4b4cbdeb8c1ec4c7cf60798b3ce0] i40e: Extract detection of HW flags into a function testing commit a3e09ded6a6d4b4cbdeb8c1ec4c7cf60798b3ce0 with gcc (GCC) 8.1.0 kernel signature: 088241b31c129662a9133802e44d2301277d5f6f43e669d26f1ae47c5a0237a6 run #0: crashed: KASAN: use-after-free Read in find_match run #1: crashed: KASAN: use-after-free Read in find_match run #2: crashed: KASAN: use-after-free Read in ipv6_get_lladdr run #3: crashed: KASAN: use-after-free Read in find_match run #4: crashed: KASAN: use-after-free Read in find_match run #5: crashed: KASAN: use-after-free Read in find_match run #6: crashed: KASAN: use-after-free Read in find_match run #7: crashed: KASAN: use-after-free Read in ip6_dst_destroy run #8: crashed: KASAN: use-after-free Read in find_match run #9: crashed: KASAN: use-after-free Read in find_match # git bisect bad a3e09ded6a6d4b4cbdeb8c1ec4c7cf60798b3ce0 Bisecting: 218 revisions left to test after this (roughly 8 steps) [cb0ce18aaf4c08f1c5c60d8a09fcba34f63f6f51] genetlink: do not parse attributes for families with zero maxattr testing commit cb0ce18aaf4c08f1c5c60d8a09fcba34f63f6f51 with gcc (GCC) 8.1.0 kernel signature: 809444eb5bdc870367665522736abfe23b868902056001c62ee121e906b3835e run #0: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #1: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #2: crashed: KASAN: use-after-free Read in find_match run #3: crashed: KASAN: use-after-free Read in find_match run #4: crashed: KASAN: use-after-free Read in find_match run #5: crashed: KASAN: use-after-free Read in find_match run #6: crashed: KASAN: use-after-free Read in find_match run #7: crashed: KASAN: use-after-free Read in find_match run #8: crashed: KASAN: use-after-free Read in find_match run #9: crashed: KASAN: use-after-free Read in find_match # git bisect bad cb0ce18aaf4c08f1c5c60d8a09fcba34f63f6f51 Bisecting: 103 revisions left to test after this (roughly 7 steps) [4495af31947bcc8886fe43737500f12729f7bdd9] net: nfc: have genetlink code to parse the attrs during dumpit testing commit 4495af31947bcc8886fe43737500f12729f7bdd9 with gcc (GCC) 8.1.0 kernel signature: 5726c0084bad572d3b7c38cdde74c09ff5ff954078e8d10e3733968f93a92047 run #0: crashed: KASAN: use-after-free Read in find_match run #1: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #2: crashed: KASAN: use-after-free Read in find_match run #3: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #4: crashed: KASAN: use-after-free Read in find_match run #5: crashed: KASAN: use-after-free Read in ipv6_add_addr run #6: crashed: KASAN: use-after-free Read in find_match run #7: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #8: crashed: KASAN: use-after-free Read in find_match run #9: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu # git bisect bad 4495af31947bcc8886fe43737500f12729f7bdd9 Bisecting: 51 revisions left to test after this (roughly 6 steps) [9077f052abd5391a866dd99e27212213648becef] net: propagate errors correctly in register_netdevice() testing commit 9077f052abd5391a866dd99e27212213648becef with gcc (GCC) 8.1.0 kernel signature: fc620c5e6f52834268c2fa5c22525118347842350ff6ff410be9a67e82f040d5 run #0: crashed: KASAN: use-after-free Read in find_match run #1: crashed: KASAN: use-after-free Read in find_match run #2: crashed: KASAN: use-after-free Read in find_match run #3: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #4: crashed: KASAN: use-after-free Read in find_match run #5: crashed: KASAN: use-after-free Read in find_match run #6: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #7: crashed: KASAN: use-after-free Read in find_match run #8: crashed: KASAN: use-after-free Read in find_match run #9: crashed: KASAN: use-after-free Read in find_match # git bisect bad 9077f052abd5391a866dd99e27212213648becef Bisecting: 25 revisions left to test after this (roughly 5 steps) [e982ae6aa4e1505d7567a54ef3f259a9647dfd35] ionic: add lif_quiesce to wait for queue activity to stop testing commit e982ae6aa4e1505d7567a54ef3f259a9647dfd35 with gcc (GCC) 8.1.0 kernel signature: b0bd550b60e8f4580b094f6f8c3e0a9ffeb2c84e41d3a3bb7269a57b63125129 all runs: crashed: KASAN: use-after-free Read in find_match # git bisect bad e982ae6aa4e1505d7567a54ef3f259a9647dfd35 Bisecting: 12 revisions left to test after this (roughly 4 steps) [9fb137aef34e4eedaa23307d309b0ebe8358fea1] net: usb: ax88179_178a: allow optionally getting mac address from device tree testing commit 9fb137aef34e4eedaa23307d309b0ebe8358fea1 with gcc (GCC) 8.1.0 kernel signature: efedf9c06be0ae8f1612c2b3096836505d0029c17cab4a59d84140cbe3a256a2 run #0: crashed: KASAN: use-after-free Read in find_match run #1: crashed: KASAN: use-after-free Read in find_match run #2: crashed: KASAN: use-after-free Read in find_match run #3: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #4: crashed: KASAN: use-after-free Read in find_match run #5: crashed: KASAN: use-after-free Read in find_match run #6: crashed: KASAN: use-after-free Read in find_match run #7: crashed: KASAN: use-after-free Read in find_match run #8: crashed: KASAN: use-after-free Read in find_match run #9: crashed: KASAN: use-after-free Read in find_match # git bisect bad 9fb137aef34e4eedaa23307d309b0ebe8358fea1 Bisecting: 6 revisions left to test after this (roughly 3 steps) [36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc] net: rtnetlink: add linkprop commands to add and delete alternative ifnames testing commit 36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc with gcc (GCC) 8.1.0 kernel signature: 355fad05c02f7fb0f8e9bb992473247181214c494a1612b88f5d7c93d9c4d03f run #0: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #1: crashed: KASAN: use-after-free Read in find_match run #2: crashed: KASAN: use-after-free Read in find_match run #3: crashed: KASAN: use-after-free Read in find_match run #4: crashed: KASAN: use-after-free Read in find_match run #5: crashed: KASAN: use-after-free Read in find_match run #6: crashed: KASAN: use-after-free Read in find_match run #7: crashed: KASAN: use-after-free Read in find_match run #8: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #9: crashed: KASAN: use-after-free Read in find_match # git bisect bad 36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc Bisecting: 2 revisions left to test after this (roughly 2 steps) [be2644aac3e1db02d09f45d56206bbdafca582a2] tcp: add ipv6_addr_v4mapped_loopback() helper testing commit be2644aac3e1db02d09f45d56206bbdafca582a2 with gcc (GCC) 8.1.0 kernel signature: bd583756b884b9959c1024f0ec54fd5a7cd170fcfecdbcf66de3144e49f756e8 all runs: OK # git bisect good be2644aac3e1db02d09f45d56206bbdafca582a2 Bisecting: 0 revisions left to test after this (roughly 1 step) [ff92741270bf8b6e78aa885f166b68c7a67ab13a] net: introduce name_node struct to be used in hashlist testing commit ff92741270bf8b6e78aa885f166b68c7a67ab13a with gcc (GCC) 8.1.0 kernel signature: fd0ca9d84003f74f60b518245ef2c5e8060bb7682a04edd3767b1943f9a7e9a9 all runs: OK # git bisect good ff92741270bf8b6e78aa885f166b68c7a67ab13a 36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc is the first bad commit commit 36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc Author: Jiri Pirko Date: Mon Sep 30 11:48:16 2019 +0200 net: rtnetlink: add linkprop commands to add and delete alternative ifnames Add two commands to add and delete list of link properties. Implement the first property type along - alternative ifnames. Each net device can have multiple alternative names. Signed-off-by: Jiri Pirko Signed-off-by: David S. Miller include/linux/netdevice.h | 4 ++ include/uapi/linux/if.h | 1 + include/uapi/linux/if_link.h | 2 + include/uapi/linux/rtnetlink.h | 7 +++ net/core/dev.c | 58 ++++++++++++++++++++++- net/core/rtnetlink.c | 103 +++++++++++++++++++++++++++++++++++++++++ security/selinux/nlmsgtab.c | 4 +- 7 files changed, 177 insertions(+), 2 deletions(-) culprit signature: 355fad05c02f7fb0f8e9bb992473247181214c494a1612b88f5d7c93d9c4d03f parent signature: fd0ca9d84003f74f60b518245ef2c5e8060bb7682a04edd3767b1943f9a7e9a9 revisions tested: 16, total time: 3h4m23.500274324s (build: 1h45m45.260783538s, test: 1h17m21.649206211s) first bad commit: 36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc net: rtnetlink: add linkprop commands to add and delete alternative ifnames cc: ["ap420073@gmail.com" "davem@davemloft.net" "dledford@redhat.com" "dsahern@gmail.com" "eparis@parisplace.org" "jiri@mellanox.com" "johannes.berg@intel.com" "kda@linux-powerpc.org" "linux-kernel@vger.kernel.org" "mkubecek@suse.cz" "netdev@vger.kernel.org" "paul@paul-moore.com" "sds@tycho.nsa.gov" "selinux@vger.kernel.org" "vincent@bernat.ch"] crash: KASAN: use-after-free Read in find_match ================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:199 [inline] BUG: KASAN: use-after-free in __in6_dev_get include/net/addrconf.h:309 [inline] BUG: KASAN: use-after-free in ip6_ignore_linkdown include/net/addrconf.h:400 [inline] BUG: KASAN: use-after-free in find_match+0x961/0xb90 net/ipv6/route.c:743 Read of size 8 at addr ffff8880896c0a60 by task kworker/1:0/17 CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.3.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x113/0x167 lib/dump_stack.c:113 print_address_description.constprop.8.cold.10+0x9/0x31d mm/kasan/report.c:374 __kasan_report.cold.11+0x1b/0x3a mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:634 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 __read_once_size include/linux/compiler.h:199 [inline] __in6_dev_get include/net/addrconf.h:309 [inline] ip6_ignore_linkdown include/net/addrconf.h:400 [inline] find_match+0x961/0xb90 net/ipv6/route.c:743 __find_rr_leaf+0x190/0x610 net/ipv6/route.c:831 find_rr_leaf net/ipv6/route.c:852 [inline] rt6_select net/ipv6/route.c:896 [inline] fib6_table_lookup+0x539/0x9e0 net/ipv6/route.c:2164 ip6_pol_route+0x1a0/0x7f0 net/ipv6/route.c:2200 ip6_pol_route_input+0x4f/0x80 net/ipv6/route.c:2258 fib6_rule_lookup+0x10c/0x730 net/ipv6/fib6_rules.c:113 ip6_route_input_lookup+0x7e/0x90 net/ipv6/route.c:2270 ip6_route_input+0x4bc/0x840 net/ipv6/route.c:2442 ip6_rcv_finish_core.isra.16+0xce/0x3f0 net/ipv6/ip6_input.c:63 ip6_rcv_finish+0x138/0x290 net/ipv6/ip6_input.c:74 NF_HOOK include/linux/netfilter.h:305 [inline] ipv6_rcv+0xf3/0x310 net/ipv6/ip6_input.c:274 __netif_receive_skb_one_core+0xe9/0x170 net/core/dev.c:5118 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5232 process_backlog+0x1ca/0x6d0 net/core/dev.c:6063 napi_poll net/core/dev.c:6500 [inline] net_rx_action+0x458/0xe40 net/core/dev.c:6568 __do_softirq+0x262/0x9a8 kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.12+0x126/0x160 kernel/softirq.c:337 do_softirq kernel/softirq.c:329 [inline] __local_bh_enable_ip+0x21d/0x260 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:688 [inline] ip6_finish_output2+0xca1/0x22f0 net/ipv6/ip6_output.c:117 __ip6_finish_output+0x36c/0x930 net/ipv6/ip6_output.c:142 ip6_finish_output+0x27/0x170 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0x1bf/0x630 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] mld_sendpack+0x870/0xcb0 net/ipv6/mcast.c:1682 mld_send_initial_cr.part.32+0xd7/0x110 net/ipv6/mcast.c:2099 mld_send_initial_cr net/ipv6/mcast.c:2112 [inline] ipv6_mc_dad_complete+0x14d/0x1a0 net/ipv6/mcast.c:2106 addrconf_dad_completed+0x86f/0xbb0 net/ipv6/addrconf.c:4176 addrconf_dad_work+0x63c/0xf60 net/ipv6/addrconf.c:4107 process_one_work+0x856/0x1630 kernel/workqueue.c:2269 worker_thread+0x85/0xb60 kernel/workqueue.c:2415 kthread+0x331/0x3f0 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Allocated by task 8068: save_stack+0x21/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc.constprop.13+0xc7/0xd0 mm/kasan/common.c:510 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524 __do_kmalloc_node mm/slab.c:3615 [inline] __kmalloc_node+0x4d/0x70 mm/slab.c:3622 kmalloc_node include/linux/slab.h:595 [inline] kvmalloc_node+0x6a/0x80 mm/util.c:564 kvmalloc include/linux/mm.h:670 [inline] kvzalloc include/linux/mm.h:678 [inline] alloc_netdev_mqs+0x5d/0xbf0 net/core/dev.c:9311 vti6_init_net+0x1ba/0x670 net/ipv6/ip6_vti.c:1110 ops_init+0x95/0x380 net/core/net_namespace.c:137 setup_net+0x2d1/0x7a0 net/core/net_namespace.c:334 copy_net_ns+0x24a/0x370 net/core/net_namespace.c:475 create_new_namespaces+0x483/0x750 kernel/nsproxy.c:103 unshare_nsproxy_namespaces+0x87/0x1a0 kernel/nsproxy.c:202 ksys_unshare+0x324/0x720 kernel/fork.c:2836 __do_sys_unshare kernel/fork.c:2904 [inline] __se_sys_unshare kernel/fork.c:2902 [inline] __x64_sys_unshare+0x2c/0x40 kernel/fork.c:2902 do_syscall_64+0xca/0x5d0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8362: save_stack+0x21/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:471 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480 __cache_free mm/slab.c:3425 [inline] kfree+0x108/0x2c0 mm/slab.c:3756 __netdev_name_node_alt_destroy+0x1d0/0x270 net/core/dev.c:321 netdev_name_node_alt_destroy+0x43/0x70 net/core/dev.c:333 rtnl_alt_ifname net/core/rtnetlink.c:3400 [inline] rtnl_linkprop.isra.32+0x4e8/0x630 net/core/rtnetlink.c:3452 rtnl_dellinkprop+0x40/0x60 net/core/rtnetlink.c:3473 rtnetlink_rcv_msg+0x34f/0x8f0 net/core/rtnetlink.c:5323 netlink_rcv_skb+0x13c/0x380 net/netlink/af_netlink.c:2477 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:5341 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x43b/0x640 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x74b/0xbf0 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:657 ___sys_sendmsg+0x647/0x950 net/socket.c:2311 __sys_sendmsg+0xd9/0x180 net/socket.c:2356 __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg net/socket.c:2363 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2363 do_syscall_64+0xca/0x5d0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880896c0740 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 800 bytes inside of 4096-byte region [ffff8880896c0740, ffff8880896c1740) The buggy address belongs to the page: page:ffffea000225b000 refcount:1 mapcount:0 mapping:ffff8880aa402000 index:0x0 compound_mapcount: 0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea000261fc08 ffffea000225b088 ffff8880aa402000 raw: 0000000000000000 ffff8880896c0740 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880896c0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880896c0980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880896c0a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880896c0a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880896c0b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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