bisecting cause commit starting from 829e6944699530c47739b5ef091f8137526c1494 building syzkaller on 5d7b90f1af2e3bf33992b75e7fcf0bab6bf49bd6 testing commit 829e6944699530c47739b5ef091f8137526c1494 with gcc (GCC) 8.1.0 kernel signature: 4ad1160d02195e18ea31f3304d5d0ed9c5ce5abf0389c2f6586682acaeae94c7 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 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 __ipv6_ifa_notify testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0 kernel signature: b2cb74d183865a84d627e07b2301e27b929d0d3e85dfcbdcaef4017ea645f6db 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 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 testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: 2ca88b347943a3103a33351f630622a0fde92d2dd2ebbbf1ba83102cf94ef3b3 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: 2db5cd40ae9cb3843dd4b1ec2d60b2beee5e82f85abcbbfb9b0ad1a8e03e053d run #0: crashed: KASAN: use-after-free Read in ip6_dst_destroy run #1: crashed: KASAN: use-after-free Read in find_match run #2: crashed: KASAN: use-after-free Read in ipv6_get_ifaddr 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 l3mdev_master_ifindex_rcu 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: 707c32e4524b22ffa0079f099de66d755404e52a256b480a01becb38e5453697 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 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 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: 02c4f154da22fb7a74a36a92fe4217885ec917a9e53027f7ca0ad2ec421f81db 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 l3mdev_master_ifindex_rcu 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: 9abe1ec469570a3dc4263c6c51d52f084768da2360e8a8a94697fa4e9a152167 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 ipv6_get_ifaddr # 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: 3aa1e8e13764ab51aa8cbac5067a80890cc6496897e2ed852d9a6c17fd7f0ed5 all runs: 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: 9fb845a417e0db3959f9ff424eca13c4822253dd817b6592d735d4326222eda2 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 mld_in_v1_mode 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: eda4b781805bbe723e748ef8e3d4f2339432d5f4c43873fe0757553e430ca32d 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 find_match 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 find_match # 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: b917be2f50460303305b7153a125f041cd00fc964242146d86935d9e69ced7a8 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 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 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: dda3bca95b520f3516fc42337b2ed821404dd27e88196c7a2ca946efed60143f run #0: crashed: KASAN: use-after-free Read in mld_in_v1_mode 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 veth_xmit 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 mld_in_v1_mode 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 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: ec51eb23495b3d861a17f143a6f98a9b3545ab2685be09c89b71ba52d5276cf9 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 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: b495236ae07b5a252436fbcf0935f49d3ab6abf7796d7aaf2ea00f75e7a10a67 run #0: crashed: KASAN: use-after-free Read in l3mdev_master_ifindex_rcu run #1: crashed: KASAN: use-after-free Read in ip6_dst_destroy 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 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: fd977c24454cc64132b453fb791ad7b47d4af03fe9bec19350126b9462748f9f 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: 5fdce417ca1b49c47e0f18142adcb6399f775375ca0c3fe1af8f0563888a2ae5 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: b495236ae07b5a252436fbcf0935f49d3ab6abf7796d7aaf2ea00f75e7a10a67 parent signature: 5fdce417ca1b49c47e0f18142adcb6399f775375ca0c3fe1af8f0563888a2ae5 revisions tested: 16, total time: 3h4m25.903421657s (build: 1h44m39.302815428s, test: 1h18m31.56358008s) 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 ffff888077ca0720 by task kworker/u4:0/7 CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.3.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker 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 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline] _raw_spin_unlock_bh+0x30/0x40 kernel/locking/spinlock.c:207 spin_unlock_bh include/linux/spinlock.h:383 [inline] batadv_nc_purge_paths+0x1e8/0x310 net/batman-adv/network-coding.c:470 batadv_nc_worker+0x1f3/0x630 net/batman-adv/network-coding.c:719 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 8067: 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 rtnl_create_link+0x1e2/0xb90 net/core/rtnetlink.c:2934 __rtnl_newlink+0xbd0/0x1400 net/core/rtnetlink.c:3189 rtnl_newlink+0x61/0x90 net/core/rtnetlink.c:3257 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_sendto+0x1f2/0x2e0 net/socket.c:1952 __do_compat_sys_socketcall net/compat.c:771 [inline] __se_compat_sys_socketcall net/compat.c:719 [inline] __ia32_compat_sys_socketcall+0x473/0x610 net/compat.c:719 do_syscall_32_irqs_on arch/x86/entry/common.c:333 [inline] do_fast_syscall_32+0x235/0xb3b arch/x86/entry/common.c:404 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 Freed by task 8395: 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 __compat_sys_sendmsg net/compat.c:642 [inline] __do_compat_sys_sendmsg net/compat.c:649 [inline] __se_compat_sys_sendmsg net/compat.c:646 [inline] __ia32_compat_sys_sendmsg+0x75/0xb0 net/compat.c:646 do_syscall_32_irqs_on arch/x86/entry/common.c:333 [inline] do_fast_syscall_32+0x235/0xb3b arch/x86/entry/common.c:404 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 The buggy address belongs to the object at ffff888077ca0400 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 800 bytes inside of 4096-byte region [ffff888077ca0400, ffff888077ca1400) The buggy address belongs to the page: page:ffffea0001df2800 refcount:1 mapcount:0 mapping:ffff8880aa402000 index:0x0 compound_mapcount: 0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea0001df1b88 ffffea0001df2888 ffff8880aa402000 raw: 0000000000000000 ffff888077ca0400 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888077ca0600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888077ca0680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888077ca0700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888077ca0780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888077ca0800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================