do_syscall_64+0xcd/0x110 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Uninit was created at:
==================================================================
BUG: KMSAN: uninit-value in print_stack_trace+0xf4/0x360 kernel/stacktrace.c:21
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.20.0-rc5+ #2
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+0x1c9/0x220 lib/dump_stack.c:113
 kmsan_report+0x12d/0x290 mm/kmsan/kmsan.c:682
 __msan_warning+0x76/0xc0 mm/kmsan/kmsan_instr.c:316
 print_stack_trace+0xf4/0x360 kernel/stacktrace.c:21
 kmsan_print_origin+0x206/0x260 mm/kmsan/kmsan.c:415
 kmsan_internal_chain_origin+0x247/0x260 mm/kmsan/kmsan.c:462
 kmsan_memcpy_memmove_metadata+0x1a9/0xf30 mm/kmsan/kmsan.c:345
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:363
 __msan_memcpy+0x61/0x70 mm/kmsan/kmsan_instr.c:148
 skb_copy_from_linear_data_offset include/linux/skbuff.h:3445 [inline]
 skb_copy_bits+0x1d2/0xc90 net/core/skbuff.c:2033
 tcp_collapse+0x1cb9/0x26d0 net/ipv4/tcp_input.c:4922
 tcp_prune_queue net/ipv4/tcp_input.c:5070 [inline]
 tcp_try_rmem_schedule+0x10c4/0x2080 net/ipv4/tcp_input.c:4462
 tcp_data_queue_ofo net/ipv4/tcp_input.c:4483 [inline]
 tcp_data_queue+0x2496/0x9420 net/ipv4/tcp_input.c:4790
 tcp_rcv_established+0x1ad6/0x28d0 net/ipv4/tcp_input.c:5648
 tcp_v4_do_rcv+0x686/0xd80 net/ipv4/tcp_ipv4.c:1534
 tcp_v4_rcv+0x6a5c/0x7080 net/ipv4/tcp_ipv4.c:1826
 ip_local_deliver_finish+0x7b8/0xef0 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+0x756/0x10f0 net/core/dev.c:5859
 napi_poll net/core/dev.c:6282 [inline]
 net_rx_action+0x876/0x1b40 net/core/dev.c:6348
 __do_softirq+0x5ff/0xab6 kernel/softirq.c:293
 invoke_softirq kernel/softirq.c:375 [inline]
 irq_exit+0x2ae/0x2f0 kernel/softirq.c:416
 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:536
 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1063
 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:811
 </IRQ>
RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:57 [inline]
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:99 [inline]
RIP: 0010:default_idle+0x2be/0x580 arch/x86/kernel/process.c:561
Code: 04 24 00 00 00 00 8b 45 c0 41 89 44 24 08 8b 45 c4 41 89 84 24 90 0c 00 00 48 c7 c7 08 26 cb 8b 8b 75 bc e8 a4 b1 b9 f6 fb f4 <be> 04 00 00 00 48 c7 c7 20 a1 02 00 e8 b1 cf 38 f7 65 8b 04 25 20
RSP: 0018:ffff8881de30fdd0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff8881fd833008 RBX: 0000000000000000 RCX: ffff8881fd833008
RDX: ffff8881fd433008 RSI: 0000160000000000 RDI: ccccccccccccd000
RBP: ffff8881de30fe18 R08: ffff888000000000 R09: ffff8881de30fd78
R10: 0000000000000000 R11: ffffffff8ac4ab30 R12: ffff8881de2e0988
R13: 0000000000000001 R14: ffff8881de2e0000 R15: ffff8881de2e0988
 arch_cpu_idle+0x26/0x30 arch/x86/kernel/process.c:552
 default_idle_call kernel/sched/idle.c:93 [inline]
 cpuidle_idle_call kernel/sched/idle.c:153 [inline]
 do_idle+0x288/0x8d0 kernel/sched/idle.c:262
 cpu_startup_entry+0x45/0x50 kernel/sched/idle.c:353
 start_secondary+0x576/0x6a0 arch/x86/kernel/smpboot.c:271
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243

Local variable description: ----__ret.i.i.i.i@kmem_cache_free
Variable was created at:
 kmem_cache_free+0xd8/0x2d90 mm/slub.c:3023
 kfree_skbmem net/core/skbuff.c:603 [inline]
 __kfree_skb+0x1e2/0x210 net/core/skbuff.c:642
==================================================================