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BUG: KMSAN: uninit-value in slab_alloc_node mm/slub.c:2722 [inline]
BUG: KMSAN: uninit-value in __kmalloc_node_track_caller+0x843/0x11c0 mm/slub.c:4369
CPU: 1 PID: 5214 Comm: syz-executor3 Not tainted 4.16.0+ #81
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 slab_alloc_node mm/slub.c:2722 [inline]
 __kmalloc_node_track_caller+0x843/0x11c0 mm/slub.c:4369
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x2cf/0x9f0 net/core/skbuff.c:206
 alloc_skb include/linux/skbuff.h:984 [inline]
 sctp_packet_transmit+0x48a/0x42e0 net/sctp/output.c:581
 sctp_outq_flush+0x1a7a/0x6320 net/sctp/outqueue.c:1197
 sctp_outq_uncork+0xd2/0xf0 net/sctp/outqueue.c:776
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1805 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1210 [inline]
 sctp_do_sm+0x84ba/0x8c20 net/sctp/sm_sideeffect.c:1181
 sctp_assoc_bh_rcv+0x6cd/0xab0 net/sctp/associola.c:1065
 sctp_inq_push+0x30b/0x450 net/sctp/inqueue.c:95
 sctp_backlog_rcv+0x250/0xb10 net/sctp/input.c:350
 sk_backlog_rcv include/net/sock.h:908 [inline]
 __release_sock+0x2d6/0x680 net/core/sock.c:2271
 release_sock+0x97/0x2a0 net/core/sock.c:2786
 sctp_wait_for_connect+0x3b5/0x7d0 net/sctp/socket.c:8236
 sctp_sendmsg+0x5fdd/0x6020 net/sctp/socket.c:2043
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 SYSC_sendto+0x6c3/0x7e0 net/socket.c:1747
 SyS_sendto+0x8a/0xb0 net/socket.c:1715
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455259
RSP: 002b:00007f2059de9c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f2059dea6d4 RCX: 0000000000455259
RDX: 0000000000000001 RSI: 000000002087dffe RDI: 0000000000000014
RBP: 000000000072bea0 R08: 000000002005ffe4 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000004f8 R14: 00000000006fa7e0 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
 kmsan_slab_alloc+0x11/0x20 mm/kmsan/kmsan.c:321
 slab_post_alloc_hook mm/slab.h:445 [inline]
 slab_alloc_node mm/slub.c:2737 [inline]
 __kmalloc_node_track_caller+0xaed/0x11c0 mm/slub.c:4369
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x2cf/0x9f0 net/core/skbuff.c:206
 alloc_skb include/linux/skbuff.h:984 [inline]
 sctp_packet_transmit+0x48a/0x42e0 net/sctp/output.c:581
 sctp_outq_flush+0x1a7a/0x6320 net/sctp/outqueue.c:1197
 sctp_outq_uncork+0xd2/0xf0 net/sctp/outqueue.c:776
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1807 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1210 [inline]
 sctp_do_sm+0x860f/0x8c20 net/sctp/sm_sideeffect.c:1181
 sctp_generate_heartbeat_event+0x3cf/0x5c0 net/sctp/sm_sideeffect.c:406
 call_timer_fn+0x26a/0x5a0 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers+0xda7/0x11c0 kernel/time/timer.c:1666
 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692
 __do_softirq+0x56d/0x93d kernel/softirq.c:285
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