===================================================== BUG: KMSAN: uninit-value in __arch_swab32 syzkaller/managers/upstream-kmsan-gce/kernel/./arch/x86/include/uapi/asm/swab.h:10 [inline] BUG: KMSAN: uninit-value in __fswab32 syzkaller/managers/upstream-kmsan-gce/kernel/./include/uapi/linux/swab.h:60 [inline] BUG: KMSAN: uninit-value in ip6_flow_hdr syzkaller/managers/upstream-kmsan-gce/kernel/./include/net/ipv6.h:941 [inline] BUG: KMSAN: uninit-value in udp_tunnel6_xmit_skb+0xbee/0xf60 syzkaller/managers/upstream-kmsan-gce/kernel/net/ipv6/ip6_udp_tunnel.c:102 CPU: 1 PID: 30427 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 syzkaller/managers/upstream-kmsan-gce/kernel/lib/dump_stack.c:77 [inline] dump_stack+0x21c/0x280 syzkaller/managers/upstream-kmsan-gce/kernel/lib/dump_stack.c:118 kmsan_report+0xfb/0x1e0 syzkaller/managers/upstream-kmsan-gce/kernel/mm/kmsan/kmsan_report.c:118 __msan_warning+0x5f/0xa0 syzkaller/managers/upstream-kmsan-gce/kernel/mm/kmsan/kmsan_instr.c:197 __arch_swab32 syzkaller/managers/upstream-kmsan-gce/kernel/./arch/x86/include/uapi/asm/swab.h:10 [inline] __fswab32 syzkaller/managers/upstream-kmsan-gce/kernel/./include/uapi/linux/swab.h:60 [inline] ip6_flow_hdr syzkaller/managers/upstream-kmsan-gce/kernel/./include/net/ipv6.h:941 [inline] udp_tunnel6_xmit_skb+0xbee/0xf60 syzkaller/managers/upstream-kmsan-gce/kernel/net/ipv6/ip6_udp_tunnel.c:102 geneve6_xmit_skb syzkaller/managers/upstream-kmsan-gce/kernel/drivers/net/geneve.c:1027 [inline] geneve_xmit+0x3351/0x3c20 syzkaller/managers/upstream-kmsan-gce/kernel/drivers/net/geneve.c:1056 __netdev_start_xmit syzkaller/managers/upstream-kmsan-gce/kernel/./include/linux/netdevice.h:4718 [inline] netdev_start_xmit syzkaller/managers/upstream-kmsan-gce/kernel/./include/linux/netdevice.h:4732 [inline] xmit_one+0x2b6/0x760 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/dev.c:3564 dev_hard_start_xmit syzkaller/managers/upstream-kmsan-gce/kernel/net/core/dev.c:3580 [inline] __dev_queue_xmit+0x3426/0x4590 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/dev.c:4140 dev_queue_xmit+0x4b/0x60 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/dev.c:4173 packet_snd syzkaller/managers/upstream-kmsan-gce/kernel/net/packet/af_packet.c:2992 [inline] packet_sendmsg+0x8778/0x9a60 syzkaller/managers/upstream-kmsan-gce/kernel/net/packet/af_packet.c:3017 sock_sendmsg_nosec syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:651 [inline] sock_sendmsg syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:671 [inline] ____sys_sendmsg+0xcfc/0x12f0 syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2353 ___sys_sendmsg syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2407 [inline] __sys_sendmsg+0x6f1/0x840 syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2440 __do_sys_sendmsg syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2449 [inline] __se_sys_sendmsg+0x97/0xb0 syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2447 __x64_sys_sendmsg+0x4a/0x70 syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2447 do_syscall_64+0x9f/0x140 syzkaller/managers/upstream-kmsan-gce/kernel/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:00007f908c112188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 0000000000a9fb1f R14: 00007f908c112300 R15: 0000000000022000 Uninit was created at: kmsan_save_stack_with_flags syzkaller/managers/upstream-kmsan-gce/kernel/mm/kmsan/kmsan.c:121 [inline] kmsan_internal_poison_shadow+0x5c/0xf0 syzkaller/managers/upstream-kmsan-gce/kernel/mm/kmsan/kmsan.c:104 kmsan_slab_alloc+0x8d/0xe0 syzkaller/managers/upstream-kmsan-gce/kernel/mm/kmsan/kmsan_hooks.c:76 slab_alloc_node syzkaller/managers/upstream-kmsan-gce/kernel/mm/slub.c:2906 [inline] __kmalloc_node_track_caller+0xa48/0x1610 syzkaller/managers/upstream-kmsan-gce/kernel/mm/slub.c:4512 __kmalloc_reserve syzkaller/managers/upstream-kmsan-gce/kernel/net/core/skbuff.c:142 [inline] __alloc_skb+0x318/0xb00 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/skbuff.c:210 alloc_skb syzkaller/managers/upstream-kmsan-gce/kernel/./include/linux/skbuff.h:1094 [inline] alloc_skb_with_frags+0x1f3/0xc10 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/skbuff.c:5832 sock_alloc_send_pskb+0xcc4/0xe80 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/sock.c:2329 packet_alloc_skb syzkaller/managers/upstream-kmsan-gce/kernel/net/packet/af_packet.c:2840 [inline] packet_snd syzkaller/managers/upstream-kmsan-gce/kernel/net/packet/af_packet.c:2935 [inline] packet_sendmsg+0x6aab/0x9a60 syzkaller/managers/upstream-kmsan-gce/kernel/net/packet/af_packet.c:3017 sock_sendmsg_nosec syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:651 [inline] sock_sendmsg syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:671 [inline] ____sys_sendmsg+0xcfc/0x12f0 syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2353 ___sys_sendmsg syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2407 [inline] __sys_sendmsg+0x6f1/0x840 syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2440 __do_sys_sendmsg syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2449 [inline] __se_sys_sendmsg+0x97/0xb0 syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2447 __x64_sys_sendmsg+0x4a/0x70 syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2447 do_syscall_64+0x9f/0x140 syzkaller/managers/upstream-kmsan-gce/kernel/arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 =====================================================