=====================================================
BUG: KMSAN: uninit-value in __alloc_skb+0x215/0xa10 net/core/skbuff.c:197
CPU: 1 PID: 17414 Comm: syz-executor.4 Not tainted 5.3.0-rc7+ #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+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x13a/0x2b0 mm/kmsan/kmsan_report.c:108
 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250
 slab_alloc_node mm/slub.c:2749 [inline]
 kmem_cache_alloc_node+0x5d0/0xe70 mm/slub.c:2828
 __alloc_skb+0x215/0xa10 net/core/skbuff.c:197
 alloc_skb include/linux/skbuff.h:1056 [inline]
 _sctp_make_chunk+0xee/0x8c0 net/sctp/sm_make_chunk.c:1392
 sctp_make_control net/sctp/sm_make_chunk.c:1439 [inline]
 sctp_make_heartbeat+0xb4/0xa10 net/sctp/sm_make_chunk.c:1146
 sctp_sf_heartbeat net/sctp/sm_statefuns.c:990 [inline]
 sctp_sf_do_prm_requestheartbeat+0x8f/0x4b0 net/sctp/sm_statefuns.c:5327
 sctp_do_sm+0x2b2/0x9720 net/sctp/sm_sideeffect.c:1152
 sctp_primitive_REQUESTHEARTBEAT+0x175/0x1a0 net/sctp/primitive.c:185
 sctp_apply_peer_addr_params+0x212/0x1d40 net/sctp/socket.c:2518
 sctp_setsockopt_peer_addr_params net/sctp/socket.c:2771 [inline]
 sctp_setsockopt+0x174a7/0x17b90 net/sctp/socket.c:4666
 sock_common_setsockopt+0x13b/0x170 net/core/sock.c:3139
 __sys_setsockopt+0x7c3/0xa30 net/socket.c:2084
 __do_sys_setsockopt net/socket.c:2100 [inline]
 __se_sys_setsockopt+0xdd/0x100 net/socket.c:2097
 __x64_sys_setsockopt+0x62/0x80 net/socket.c:2097
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x459a29
Code: fd b7 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 b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa172b95c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459a29
RDX: 0000000000000009 RSI: 0000000000000084 RDI: 0000000000000007
RBP: 000000000075bf20 R08: 0000000000000098 R09: 0000000000000000
R10: 0000000020000280 R11: 0000000000000246 R12: 00007fa172b966d4
R13: 00000000004d0538 R14: 00000000004def50 R15: 00000000ffffffff

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:150 [inline]
 kmsan_internal_chain_origin+0xd2/0x170 mm/kmsan/kmsan.c:314
 __msan_chain_origin+0x6b/0xe0 mm/kmsan/kmsan_instr.c:184
 ___slab_alloc+0x1dbc/0x1fb0 mm/slub.c:2634
 __slab_alloc mm/slub.c:2687 [inline]
 slab_alloc_node mm/slub.c:2750 [inline]
 kmem_cache_alloc_node+0x769/0xe70 mm/slub.c:2828
 __alloc_skb+0x215/0xa10 net/core/skbuff.c:197
 alloc_skb include/linux/skbuff.h:1056 [inline]
 sctp_packet_transmit+0x417/0x4350 net/sctp/output.c:572
 sctp_outq_flush_transports net/sctp/outqueue.c:1146 [inline]
 sctp_outq_flush+0x1823/0x5d80 net/sctp/outqueue.c:1194
 sctp_outq_uncork+0xd0/0xf0 net/sctp/outqueue.c:757
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1781 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1184 [inline]
 sctp_do_sm+0x8fe1/0x9720 net/sctp/sm_sideeffect.c:1155
 sctp_primitive_REQUESTHEARTBEAT+0x175/0x1a0 net/sctp/primitive.c:185
 sctp_apply_peer_addr_params+0x212/0x1d40 net/sctp/socket.c:2518
 sctp_setsockopt_peer_addr_params net/sctp/socket.c:2771 [inline]
 sctp_setsockopt+0x174a7/0x17b90 net/sctp/socket.c:4666
 sock_common_setsockopt+0x13b/0x170 net/core/sock.c:3139
 __sys_setsockopt+0x7c3/0xa30 net/socket.c:2084
 __do_sys_setsockopt net/socket.c:2100 [inline]
 __se_sys_setsockopt+0xdd/0x100 net/socket.c:2097
 __x64_sys_setsockopt+0x62/0x80 net/socket.c:2097
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:150 [inline]
 kmsan_internal_poison_shadow+0x53/0x100 mm/kmsan/kmsan.c:134
 kmsan_slab_free+0x8d/0x100 mm/kmsan/kmsan_hooks.c:123
 slab_free_freelist_hook mm/slub.c:1472 [inline]
 slab_free mm/slub.c:3038 [inline]
 kmem_cache_free_bulk+0x3ad9/0x3f50 mm/slub.c:3163
 _kfree_skb_defer net/core/skbuff.c:885 [inline]
 napi_consume_skb+0x593/0x5d0 net/core/skbuff.c:918
 free_old_xmit_skbs+0x1a1/0x450 drivers/net/virtio_net.c:1366
 virtnet_poll_tx+0x24c/0x4c0 drivers/net/virtio_net.c:1493
 napi_poll net/core/dev.c:6352 [inline]
 net_rx_action+0x74b/0x1950 net/core/dev.c:6418
 __do_softirq+0x4a1/0x83a kernel/softirq.c:293
 invoke_softirq kernel/softirq.c:375 [inline]
 irq_exit+0x230/0x280 kernel/softirq.c:416
 exiting_irq arch/x86/include/asm/apic.h:537 [inline]
 do_IRQ+0x20d/0x3a0 arch/x86/kernel/irq.c:259
 ret_from_intr+0x0/0x33
 native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline]
 arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline]
 default_idle+0x53/0x90 arch/x86/kernel/process.c:580
 arch_cpu_idle+0x25/0x30 arch/x86/kernel/process.c:571
 default_idle_call kernel/sched/idle.c:94 [inline]
 cpuidle_idle_call kernel/sched/idle.c:154 [inline]
 do_idle+0x1d7/0x790 kernel/sched/idle.c:263
 cpu_startup_entry+0x45/0x50 kernel/sched/idle.c:354
 start_secondary+0x370/0x470 arch/x86/kernel/smpboot.c:264
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241
=====================================================