================================================================== BUG: KMSAN: uninit-value in prefetch_freepointer mm/slub.c:276 [inline] BUG: KMSAN: uninit-value in slab_alloc_node mm/slub.c:2713 [inline] BUG: KMSAN: uninit-value in __kmalloc_node_track_caller+0xe81/0x11d0 mm/slub.c:4353 CPU: 1 PID: 6785 Comm: syz-executor3 Not tainted 4.18.0-rc8+ #34 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x17c/0x1c0 lib/dump_stack.c:113 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:982 __msan_warning+0x70/0xc0 mm/kmsan/kmsan_instr.c:645 prefetch_freepointer mm/slub.c:276 [inline] slab_alloc_node mm/slub.c:2713 [inline] __kmalloc_node_track_caller+0xe81/0x11d0 mm/slub.c:4353 __kmalloc_reserve net/core/skbuff.c:138 [inline] pskb_expand_head+0x231/0x19b0 net/core/skbuff.c:1463 netlink_trim+0x398/0x400 net/netlink/af_netlink.c:1299 netlink_broadcast_filtered+0x1bd/0x1e20 net/netlink/af_netlink.c:1496 netlink_broadcast net/netlink/af_netlink.c:1541 [inline] nlmsg_multicast include/net/netlink.h:591 [inline] nlmsg_notify+0x1dd/0x3d0 net/netlink/af_netlink.c:2498 rtnl_notify net/core/rtnetlink.c:732 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:3288 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:3303 [inline] rtmsg_ifinfo+0x1e9/0x260 net/core/rtnetlink.c:3309 netdev_state_change+0x1dd/0x2c0 net/core/dev.c:1342 do_setlink+0x1818/0x6080 net/core/rtnetlink.c:2588 rtnl_group_changelink net/core/rtnetlink.c:2837 [inline] rtnl_newlink+0x2257/0x39e0 net/core/rtnetlink.c:2995 rtnetlink_rcv_msg+0xa0b/0x1530 net/core/rtnetlink.c:4665 netlink_rcv_skb+0x36e/0x5f0 net/netlink/af_netlink.c:2455 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:4683 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x1492/0x1740 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x114c/0x1350 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:642 [inline] sock_sendmsg net/socket.c:652 [inline] ___sys_sendmsg+0xe32/0x1250 net/socket.c:2126 __sys_sendmsg net/socket.c:2164 [inline] __do_sys_sendmsg net/socket.c:2173 [inline] __se_sys_sendmsg net/socket.c:2171 [inline] __x64_sys_sendmsg+0x32d/0x460 net/socket.c:2171 do_syscall_64+0x15b/0x220 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x457089 Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f62b98fcc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f62b98fd6d4 RCX: 0000000000457089 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000006 RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d4188 R14: 00000000004c8b53 R15: 0000000000000001 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline] kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:181 kmsan_kmalloc+0x98/0x100 mm/kmsan/kmsan_hooks.c:91 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan_hooks.c:100 slab_post_alloc_hook mm/slab.h:446 [inline] slab_alloc_node mm/slub.c:2720 [inline] __kmalloc_node_track_caller+0xb4c/0x11d0 mm/slub.c:4353 __kmalloc_reserve net/core/skbuff.c:138 [inline] __alloc_skb+0x2ce/0x9b0 net/core/skbuff.c:206 alloc_skb include/linux/skbuff.h:988 [inline] alloc_skb_with_frags+0x1d0/0xac0 net/core/skbuff.c:5272 sock_alloc_send_pskb+0xb47/0x1120 net/core/sock.c:2095 sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2112 mld_newpack+0x295/0xd20 net/ipv6/mcast.c:1610 add_grhead net/ipv6/mcast.c:1714 [inline] add_grec+0x1e40/0x22c0 net/ipv6/mcast.c:1845 mld_send_cr net/ipv6/mcast.c:1971 [inline] mld_ifc_timer_expire+0x1007/0x17b0 net/ipv6/mcast.c:2478 call_timer_fn+0x270/0x5c0 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0xd74/0x1170 kernel/time/timer.c:1666 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692 __do_softirq+0x582/0x969 kernel/softirq.c:292 ==================================================================