TSC Offset = 0xfffffdb550666f54
TPR Threshold = 0x00
EPT pointer = 0x000000007b2c501e
==================================================================
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 erspan_rcv net/ipv4/ip_gre.c:282 [inline]
BUG: KMSAN: uninit-value in gre_rcv+0x11a3/0x1900 net/ipv4/ip_gre.c:422
CPU: 1 PID: 6306 Comm: syz-executor4 Not tainted 4.20.0-rc3+ #95
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x32d/0x480 lib/dump_stack.c:113
 kmsan_report+0x12c/0x290 mm/kmsan/kmsan.c:683
 __msan_warning+0x76/0xc0 mm/kmsan/kmsan_instr.c:330
 __arch_swab32 arch/x86/include/uapi/asm/swab.h:10 [inline]
 __fswab32 include/uapi/linux/swab.h:59 [inline]
 erspan_rcv net/ipv4/ip_gre.c:282 [inline]
 gre_rcv+0x11a3/0x1900 net/ipv4/ip_gre.c:422
 gre_rcv+0x2e6/0x3c0 net/ipv4/gre_demux.c:143
 ip_local_deliver_finish+0x8d8/0xff0 net/ipv4/ip_input.c:215
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ip_local_deliver+0x44b/0x510 net/ipv4/ip_input.c:256
 dst_input include/net/dst.h:450 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:415 [inline]
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ip_rcv+0x6b6/0x740 net/ipv4/ip_input.c:524
 __netif_receive_skb_one_core net/core/dev.c:4941 [inline]
 __netif_receive_skb net/core/dev.c:5051 [inline]
 process_backlog+0x82b/0x11e0 net/core/dev.c:5855
 napi_poll net/core/dev.c:6275 [inline]
 net_rx_action+0x98f/0x1d50 net/core/dev.c:6341
 __do_softirq+0x721/0xc7f kernel/softirq.c:292
 do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1031
 </IRQ>
 do_softirq kernel/softirq.c:337 [inline]
 __local_bh_enable_ip+0x228/0x260 kernel/softirq.c:189
 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32
 rcu_read_unlock_bh include/linux/rcupdate.h:696 [inline]
 ip_finish_output2+0x1430/0x1560 net/ipv4/ip_output.c:231
 ip_finish_output+0xd93/0x10f0 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip_mc_output+0xf25/0x10f0 net/ipv4/ip_output.c:390
 dst_output include/net/dst.h:444 [inline]
 ip_local_out net/ipv4/ip_output.c:124 [inline]
 __ip_queue_xmit+0x1bb5/0x2170 net/ipv4/ip_output.c:505
 sctp_v4_xmit+0x258/0x300 net/sctp/protocol.c:991
 sctp_packet_transmit+0x3f66/0x43c0 net/sctp/output.c:656
 sctp_packet_singleton net/sctp/outqueue.c:787 [inline]
 sctp_outq_flush_ctrl net/sctp/outqueue.c:918 [inline]
 sctp_outq_flush+0x9b8/0x5c50 net/sctp/outqueue.c:1200
 sctp_outq_uncork+0xd0/0xf0 net/sctp/outqueue.c:772
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1820 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline]
 sctp_do_sm+0x94bb/0x9c50 net/sctp/sm_sideeffect.c:1191
 sctp_primitive_ASSOCIATE+0x172/0x1a0 net/sctp/primitive.c:88
 __sctp_connect+0x17d3/0x1c30 net/sctp/socket.c:1226
 sctp_connect net/sctp/socket.c:4533 [inline]
 sctp_inet_connect+0x402/0x520 net/sctp/socket.c:4549
 __sys_connect+0x745/0x860 net/socket.c:1664
 __do_sys_connect net/socket.c:1675 [inline]
 __se_sys_connect+0x8d/0xb0 net/socket.c:1672
 __x64_sys_connect+0x4a/0x70 net/socket.c:1672
 do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457569
Code: fd b3 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007efc88bbec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 000000000000001c RSI: 0000000020000040 RDI: 0000000000000003
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007efc88bbf6d4
R13: 00000000004bdb10 R14: 00000000004ccf08 R15: 00000000ffffffff

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:246 [inline]
 kmsan_internal_poison_shadow+0x6d/0x130 mm/kmsan/kmsan.c:170
 kmsan_kmalloc+0xa1/0x100 mm/kmsan/kmsan_hooks.c:186
 kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:195
 slab_post_alloc_hook mm/slab.h:446 [inline]
 slab_alloc_node mm/slub.c:2765 [inline]
 __kmalloc_node_track_caller+0xf62/0x14e0 mm/slub.c:4396
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x42b/0xeb0 net/core/skbuff.c:206
 alloc_skb include/linux/skbuff.h:998 [inline]
 sctp_packet_transmit+0x478/0x43c0 net/sctp/output.c:599
 sctp_packet_singleton net/sctp/outqueue.c:787 [inline]
 sctp_outq_flush_ctrl net/sctp/outqueue.c:918 [inline]
 sctp_outq_flush+0x9b8/0x5c50 net/sctp/outqueue.c:1200
 sctp_outq_uncork+0xd0/0xf0 net/sctp/outqueue.c:772
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1820 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline]
 sctp_do_sm+0x94bb/0x9c50 net/sctp/sm_sideeffect.c:1191
 sctp_primitive_ASSOCIATE+0x172/0x1a0 net/sctp/primitive.c:88
 __sctp_connect+0x17d3/0x1c30 net/sctp/socket.c:1226
 sctp_connect net/sctp/socket.c:4533 [inline]
 sctp_inet_connect+0x402/0x520 net/sctp/socket.c:4549
 __sys_connect+0x745/0x860 net/socket.c:1664
 __do_sys_connect net/socket.c:1675 [inline]
 __se_sys_connect+0x8d/0xb0 net/socket.c:1672
 __x64_sys_connect+0x4a/0x70 net/socket.c:1672
 do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
==================================================================