=====================================================
BUG: KMSAN: uninit-value in update_stack_state+0x1ee/0xb40 arch/x86/kernel/unwind_frame.c:202
CPU: 0 PID: 30267 Comm: syz-executor.0 Not tainted 5.8.0-rc5-syzkaller #0
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+0x21c/0x280 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 update_stack_state+0x1ee/0xb40 arch/x86/kernel/unwind_frame.c:202
 unwind_next_frame+0x8c6/0xed0 arch/x86/kernel/unwind_frame.c:305
 arch_stack_walk+0x338/0x3d0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x117/0x1a0 kernel/stacktrace.c:123
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310
 kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267
 __msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116
 pskb_expand_head+0x3fd/0x1e30 net/core/skbuff.c:1636
 skb_unclone include/linux/skbuff.h:1622 [inline]
 skb_copy_ubufs+0x2123/0x29a0 net/core/skbuff.c:1348
 skb_orphan_frags_rx include/linux/skbuff.h:2764 [inline]
 __netif_receive_skb_core+0x6301/0x6520 net/core/dev.c:5246
 __netif_receive_skb_one_core net/core/dev.c:5279 [inline]
 __netif_receive_skb+0x164/0x670 net/core/dev.c:5395
 process_backlog+0x50d/0xba0 net/core/dev.c:6239
 napi_poll+0x43b/0xfd0 net/core/dev.c:6684
 net_rx_action+0x35c/0xd40 net/core/dev.c:6752
 __do_softirq+0x2ea/0x7f5 kernel/softirq.c:293
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:23 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline]
 do_softirq_own_stack+0x7c/0xa0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:390 [inline]
 __irq_exit_rcu+0x226/0x270 kernel/softirq.c:420
 irq_exit_rcu+0xe/0x10 kernel/softirq.c:432
 sysvec_call_function_single+0x107/0x130 arch/x86/kernel/smp.c:243
 asm_sysvec_call_function_single+0x12/0x20 arch/x86/include/asm/idtentry.h:601
RIP: 0010:kmsan_task_context_state+0x4d/0x90 mm/kmsan/kmsan.c:77
Code: 85 d2 74 26 48 98 48 c7 c3 10 83 02 00 48 03 1c c5 a0 36 0c 92 ba b0 0f 00 00 48 89 df 31 f6 e8 09 57 bf 03 48 89 d8 5b 5d c3 <85> c9 74 1e 48 63 c9 48 69 c9 b0 0f 00 00 48 98 48 8b 04 c5 a0 36
RSP: 0018:ffff8881d1bf6fa0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffff8881d1bf6fa8 R08: ffffffff8ddf199c R09: ffff88812fffa000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888024270b00 R14: ffff888036d36560 R15: ffff888036d36558
 __msan_get_context_state+0x9/0x20 mm/kmsan/kmsan_instr.c:225
 do_softirq+0x23/0x150 kernel/softirq.c:326
 netif_rx_ni+0x21b/0x3c0 net/core/dev.c:4830
 dev_loopback_xmit+0x64c/0x730 net/core/dev.c:3846
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ip6_finish_output2+0x274a/0x2a70 net/ipv6/ip6_output.c:81
 __ip6_finish_output+0x9c0/0xa90 net/ipv6/ip6_output.c:143
 ip6_finish_output+0x14b/0x4b0 net/ipv6/ip6_output.c:153
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip6_output+0x68d/0x7f0 net/ipv6/ip6_output.c:176
 dst_output include/net/dst.h:443 [inline]
 ip6_local_out+0x17b/0x1e0 net/ipv6/output_core.c:179
 ip6_send_skb+0xfd/0x430 net/ipv6/ip6_output.c:1865
 udp_v6_send_skb+0x14cc/0x21a0 net/ipv6/udp.c:1175
 udpv6_sendmsg+0x52c0/0x55c0 net/ipv6/udp.c:1473
 inet6_sendmsg+0x15b/0x1d0 net/ipv6/af_inet6.c:638
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0xc82/0x1240 net/socket.c:2352
 ___sys_sendmsg net/socket.c:2406 [inline]
 __sys_sendmmsg+0x9ee/0xfd0 net/socket.c:2496
 __do_sys_sendmmsg net/socket.c:2525 [inline]
 __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2522
 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2522
 do_syscall_64+0xad/0x160 arch/x86/entry/common.c:386
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5f9
Code: Bad RIP value.
RSP: 002b:00007f3c2fc8fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000027a40 RCX: 000000000045d5f9
RDX: 0000000000000237 RSI: 0000000020004d80 RDI: 0000000000000003
RBP: 000000000118d168 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000004000000 R11: 0000000000000246 R12: 000000000118d12c
R13: 000000000169fb6f R14: 00007f3c2fc909c0 R15: 000000000118d12c

Local variable ----item@nf_ct_deliver_cached_events created at:
 nf_ct_deliver_cached_events+0x7d/0x7e0 net/netfilter/nf_conntrack_ecache.c:197
 nf_ct_deliver_cached_events+0x7d/0x7e0 net/netfilter/nf_conntrack_ecache.c:197
=====================================================