syzbot

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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:59 [inline]
BUG: KMSAN: uninit-value in __xfrm4_dpref_spref_hash net/xfrm/xfrm_hash.h:49 [inline]
BUG: KMSAN: uninit-value in __addr_hash net/xfrm/xfrm_hash.h:178 [inline]
BUG: KMSAN: uninit-value in policy_hash_direct net/xfrm/xfrm_policy.c:502 [inline]
BUG: KMSAN: uninit-value in xfrm_policy_lookup_bytype+0x7e1/0x2c80 net/xfrm/xfrm_policy.c:2090
CPU: 1 PID: 22282 Comm: syz-executor.4 Not tainted 5.1.0-rc4+ #1
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+0x173/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x131/0x2a0 mm/kmsan/kmsan.c:619
 __msan_warning+0x7a/0xf0 mm/kmsan/kmsan_instr.c:310
 __arch_swab32 arch/x86/include/uapi/asm/swab.h:10 [inline]
 __fswab32 include/uapi/linux/swab.h:59 [inline]
 __xfrm4_dpref_spref_hash net/xfrm/xfrm_hash.h:49 [inline]
 __addr_hash net/xfrm/xfrm_hash.h:178 [inline]
 policy_hash_direct net/xfrm/xfrm_policy.c:502 [inline]
 xfrm_policy_lookup_bytype+0x7e1/0x2c80 net/xfrm/xfrm_policy.c:2090
 xfrm_policy_lookup net/xfrm/xfrm_policy.c:2140 [inline]
 xfrm_bundle_lookup net/xfrm/xfrm_policy.c:2942 [inline]
 xfrm_lookup_with_ifid+0xeab/0x3dd0 net/xfrm/xfrm_policy.c:3083
 xfrm_lookup net/xfrm/xfrm_policy.c:3175 [inline]
 xfrm_lookup_route+0x100/0x370 net/xfrm/xfrm_policy.c:3186
 ip_route_output_flow+0x36a/0x3e0 net/ipv4/route.c:2595
 ip_route_output_key include/net/route.h:134 [inline]
 ip_tunnel_xmit+0x11e6/0x3310 net/ipv4/ip_tunnel.c:766
 __gre_xmit net/ipv4/ip_gre.c:444 [inline]
 ipgre_xmit+0x1098/0x11c0 net/ipv4/ip_gre.c:628
 __netdev_start_xmit include/linux/netdevice.h:4411 [inline]
 netdev_start_xmit include/linux/netdevice.h:4420 [inline]
 xmit_one net/core/dev.c:3278 [inline]
 dev_hard_start_xmit+0x604/0xc40 net/core/dev.c:3294
 __dev_queue_xmit+0x2e9f/0x3ce0 net/core/dev.c:3864
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3897
 packet_snd net/packet/af_packet.c:2932 [inline]
 packet_sendmsg+0x8116/0x9010 net/packet/af_packet.c:2957
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:661 [inline]
 ___sys_sendmsg+0xdb3/0x1220 net/socket.c:2260
 __sys_sendmsg net/socket.c:2298 [inline]
 __do_sys_sendmsg net/socket.c:2307 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2305
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2305
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x458c29
Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f719e01ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29
RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000004
RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f719e01f6d4
R13: 00000000004c64a3 R14: 00000000004dadd8 R15: 00000000ffffffff

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:220 [inline]
 kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:426
 __msan_chain_origin+0x70/0xe0 mm/kmsan/kmsan_instr.c:200
 ip_tunnel_init_flow include/net/ip_tunnels.h:248 [inline]
 ip_tunnel_xmit+0xba0/0x3310 net/ipv4/ip_tunnel.c:748
 __gre_xmit net/ipv4/ip_gre.c:444 [inline]
 ipgre_xmit+0x1098/0x11c0 net/ipv4/ip_gre.c:628
 __netdev_start_xmit include/linux/netdevice.h:4411 [inline]
 netdev_start_xmit include/linux/netdevice.h:4420 [inline]
 xmit_one net/core/dev.c:3278 [inline]
 dev_hard_start_xmit+0x604/0xc40 net/core/dev.c:3294
 __dev_queue_xmit+0x2e9f/0x3ce0 net/core/dev.c:3864
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3897
 packet_snd net/packet/af_packet.c:2932 [inline]
 packet_sendmsg+0x8116/0x9010 net/packet/af_packet.c:2957
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:661 [inline]
 ___sys_sendmsg+0xdb3/0x1220 net/socket.c:2260
 __sys_sendmsg net/socket.c:2298 [inline]
 __do_sys_sendmsg net/socket.c:2307 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2305
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2305
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:220 [inline]
 kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:426
 kmsan_memcpy_memmove_metadata+0x989/0xd60 mm/kmsan/kmsan.c:304
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:324
 __msan_memcpy+0x58/0x70 mm/kmsan/kmsan_instr.c:139
 pskb_expand_head+0x3aa/0x1a30 net/core/skbuff.c:1478
 __skb_cow include/linux/skbuff.h:3029 [inline]
 skb_cow_head include/linux/skbuff.h:3063 [inline]
 ipgre_xmit+0x724/0x11c0 net/ipv4/ip_gre.c:607
 __netdev_start_xmit include/linux/netdevice.h:4411 [inline]
 netdev_start_xmit include/linux/netdevice.h:4420 [inline]
 xmit_one net/core/dev.c:3278 [inline]
 dev_hard_start_xmit+0x604/0xc40 net/core/dev.c:3294
 __dev_queue_xmit+0x2e9f/0x3ce0 net/core/dev.c:3864
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3897
 packet_snd net/packet/af_packet.c:2932 [inline]
 packet_sendmsg+0x8116/0x9010 net/packet/af_packet.c:2957
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:661 [inline]
 ___sys_sendmsg+0xdb3/0x1220 net/socket.c:2260
 __sys_sendmsg net/socket.c:2298 [inline]
 __do_sys_sendmsg net/socket.c:2307 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2305
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2305
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline]
 kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:159
 kmsan_kmalloc+0xa9/0x130 mm/kmsan/kmsan_hooks.c:174
 kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:183
 slab_post_alloc_hook mm/slab.h:442 [inline]
 slab_alloc_node mm/slub.c:2771 [inline]
 __kmalloc_node_track_caller+0xead/0x1000 mm/slub.c:4399
 __kmalloc_reserve net/core/skbuff.c:140 [inline]
 __alloc_skb+0x309/0xa20 net/core/skbuff.c:208
 alloc_skb include/linux/skbuff.h:1059 [inline]
 alloc_skb_with_frags+0x186/0xa60 net/core/skbuff.c:5287
 sock_alloc_send_pskb+0xafd/0x10a0 net/core/sock.c:2220
 packet_alloc_skb net/packet/af_packet.c:2782 [inline]
 packet_snd net/packet/af_packet.c:2875 [inline]
 packet_sendmsg+0x63f7/0x9010 net/packet/af_packet.c:2957
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:661 [inline]
 ___sys_sendmsg+0xdb3/0x1220 net/socket.c:2260
 __sys_sendmsg net/socket.c:2298 [inline]
 __do_sys_sendmsg net/socket.c:2307 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2305
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2305
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
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