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BUG: KMSAN: uninit-value in update_stack_state+0x1ee/0xb40 arch/x86/kernel/unwind_frame.c:202
CPU: 1 PID: 16 Comm: ksoftirqd/1 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_prepare_for_shift net/core/skbuff.c:3277 [inline]
 skb_shift+0xe62/0x2fa0 net/core/skbuff.c:3350
 tcp_skb_shift net/ipv4/tcp_input.c:1392 [inline]
 tcp_shift_skb_data net/ipv4/tcp_input.c:1500 [inline]
 tcp_sacktag_walk+0x2aec/0x3920 net/ipv4/tcp_input.c:1565
 tcp_sacktag_write_queue+0x2f4f/0x51e0 net/ipv4/tcp_input.c:1830
 tcp_ack+0x2cf7/0xb960 net/ipv4/tcp_input.c:3655
 tcp_rcv_established+0xf86/0x4480 net/ipv4/tcp_input.c:5744
 tcp_v4_do_rcv+0x80c/0xff0 net/ipv4/tcp_ipv4.c:1641
 tcp_v4_rcv+0x57d0/0x5c10 net/ipv4/tcp_ipv4.c:2023
 ip_protocol_deliver_rcu+0x572/0xc50 net/ipv4/ip_input.c:204
 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ip_local_deliver+0x727/0x8d0 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:449 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:428 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ip_rcv+0x795/0x810 net/ipv4/ip_input.c:539
 __netif_receive_skb_one_core net/core/dev.c:5281 [inline]
 __netif_receive_skb+0x265/0x670 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:__nr_to_section include/linux/mmzone.h:1210 [inline]
RIP: 0010:pfn_valid include/linux/mmzone.h:1323 [inline]
RIP: 0010:kmsan_virt_addr_valid mm/kmsan/kmsan_shadow.c:91 [inline]
RIP: 0010:virt_to_page_or_null+0x3f/0xf0 mm/kmsan/kmsan_shadow.c:129
Code: 00 00 00 00 80 77 00 00 48 01 fa 48 39 c2 77 55 8a 0d 32 11 77 10 48 89 d6 48 d3 ee 48 85 f6 75 44 48 89 d1 48 c1 e9 2e 75 3b <48> 8b 0d 9a 18 c8 10 48 85 c9 74 2f 48 89 d6 48 c1 ee 22 4c 8b 0c
RSP: 0018:ffff88812dfafd58 EFLAGS: 00000246
RAX: ffff8881adfb0024 RBX: ffff88812dfb0024 RCX: 0000000000000000
RDX: 000000012dfb0024 RSI: 0000000000000000 RDI: ffff88812dfb0024
RBP: ffff88812dfafd58 R08: ffffea000000000f R09: ffff88812fffa000
R10: 0000000000000004 R11: 0000000000000000 R12: ffff88812dfb0000
R13: 0000000000200000 R14: 0000000000000001 R15: 0000000000000001
 kmsan_get_metadata+0x116/0x180 mm/kmsan/kmsan_shadow.c:194
 kmsan_get_shadow_origin_ptr+0x81/0xb0 mm/kmsan/kmsan_shadow.c:154
 __msan_metadata_ptr_for_load_4+0x10/0x20 mm/kmsan/kmsan_instr.c:54
 to_kthread kernel/kthread.c:83 [inline]
 kthread_should_stop+0x3a/0x130 kernel/kthread.c:111
 smpboot_thread_fn+0x76e/0xa90 kernel/smpboot.c:115
 kthread+0x551/0x590 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Local variable ----heads@__run_timers created at:
 __run_timers+0x61/0xd30 kernel/time/timer.c:1742
 __run_timers+0x61/0xd30 kernel/time/timer.c:1742
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