netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'. ===================================================== BUG: KMSAN: uninit-value in __arch_swab32 arch/x86/include/uapi/asm/swab.h:10 [inline] BUG: KMSAN: uninit-value in __fswab32 include/uapi/linux/swab.h:60 [inline] BUG: KMSAN: uninit-value in ip6_flow_hdr include/net/ipv6.h:941 [inline] BUG: KMSAN: uninit-value in udp_tunnel6_xmit_skb+0xbee/0xf60 net/ipv6/ip6_udp_tunnel.c:102 CPU: 0 PID: 9386 Comm: syz-executor.0 Not tainted 5.10.0-rc4-syzkaller #0 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+0x21c/0x280 lib/dump_stack.c:118 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197 __arch_swab32 arch/x86/include/uapi/asm/swab.h:10 [inline] __fswab32 include/uapi/linux/swab.h:60 [inline] ip6_flow_hdr include/net/ipv6.h:941 [inline] udp_tunnel6_xmit_skb+0xbee/0xf60 net/ipv6/ip6_udp_tunnel.c:102 geneve6_xmit_skb drivers/net/geneve.c:1027 [inline] geneve_xmit+0x3351/0x3c20 drivers/net/geneve.c:1056 __netdev_start_xmit include/linux/netdevice.h:4718 [inline] netdev_start_xmit include/linux/netdevice.h:4732 [inline] xmit_one+0x2b6/0x760 net/core/dev.c:3564 dev_hard_start_xmit+0x196/0x420 net/core/dev.c:3580 sch_direct_xmit+0x57c/0x1a60 net/sched/sch_generic.c:314 qdisc_restart net/sched/sch_generic.c:377 [inline] __qdisc_run+0x35b/0x490 net/sched/sch_generic.c:385 __dev_xmit_skb net/core/dev.c:3803 [inline] __dev_queue_xmit+0x2120/0x4590 net/core/dev.c:4108 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4173 packet_snd net/packet/af_packet.c:2992 [inline] packet_sendmsg+0x8778/0x9a60 net/packet/af_packet.c:3017 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:671 [inline] sock_write_iter+0x585/0x680 net/socket.c:998 do_iter_readv_writev+0xa99/0xc30 include/linux/fs.h:1897 do_iter_write+0x371/0x1090 fs/read_write.c:866 vfs_writev fs/read_write.c:939 [inline] do_writev+0x55a/0xcf0 fs/read_write.c:982 __do_sys_writev fs/read_write.c:1055 [inline] __se_sys_writev+0x9b/0xb0 fs/read_write.c:1052 __x64_sys_writev+0x4a/0x70 fs/read_write.c:1052 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x465b09 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa93abe9188 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09 RDX: 0000000000000001 RSI: 0000000020000540 RDI: 0000000000000003 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 0000000000a9fb1f R14: 00007fa93abe9300 R15: 0000000000022000 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:289 __msan_chain_origin+0x57/0xa0 mm/kmsan/kmsan_instr.c:147 ipv6_change_dsfield include/net/dsfield.h:49 [inline] dsmark_dequeue+0x188d/0x1eb0 net/sched/sch_dsmark.c:312 dequeue_skb+0x4ad/0x3680 net/sched/sch_generic.c:264 qdisc_restart net/sched/sch_generic.c:367 [inline] __qdisc_run+0x101/0x490 net/sched/sch_generic.c:385 __dev_xmit_skb net/core/dev.c:3803 [inline] __dev_queue_xmit+0x2120/0x4590 net/core/dev.c:4108 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4173 packet_snd net/packet/af_packet.c:2992 [inline] packet_sendmsg+0x8778/0x9a60 net/packet/af_packet.c:3017 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:671 [inline] sock_write_iter+0x585/0x680 net/socket.c:998 do_iter_readv_writev+0xa99/0xc30 include/linux/fs.h:1897 do_iter_write+0x371/0x1090 fs/read_write.c:866 vfs_writev fs/read_write.c:939 [inline] do_writev+0x55a/0xcf0 fs/read_write.c:982 __do_sys_writev fs/read_write.c:1055 [inline] __se_sys_writev+0x9b/0xb0 fs/read_write.c:1052 __x64_sys_writev+0x4a/0x70 fs/read_write.c:1052 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline] kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76 slab_alloc_node mm/slub.c:2906 [inline] __kmalloc_node_track_caller+0xa48/0x1610 mm/slub.c:4512 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x318/0xb00 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1094 [inline] alloc_skb_with_frags+0x1f3/0xc10 net/core/skbuff.c:5832 sock_alloc_send_pskb+0xcc4/0xe80 net/core/sock.c:2329 packet_alloc_skb net/packet/af_packet.c:2840 [inline] packet_snd net/packet/af_packet.c:2935 [inline] packet_sendmsg+0x6aab/0x9a60 net/packet/af_packet.c:3017 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:671 [inline] sock_write_iter+0x585/0x680 net/socket.c:998 do_iter_readv_writev+0xa99/0xc30 include/linux/fs.h:1897 do_iter_write+0x371/0x1090 fs/read_write.c:866 vfs_writev fs/read_write.c:939 [inline] do_writev+0x55a/0xcf0 fs/read_write.c:982 __do_sys_writev fs/read_write.c:1055 [inline] __se_sys_writev+0x9b/0xb0 fs/read_write.c:1052 __x64_sys_writev+0x4a/0x70 fs/read_write.c:1052 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 =====================================================