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BUG: KMSAN: uninit-value in update_stack_state+0x974/0xb40 arch/x86/kernel/unwind_frame.c:238
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+0x974/0xb40 arch/x86/kernel/unwind_frame.c:238
 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_carve_inside_nonlinear net/core/skbuff.c:5956 [inline]
 pskb_carve+0x869/0x2ff0 net/core/skbuff.c:6024
 pskb_extract+0x116/0x4c0 net/core/skbuff.c:6038
 rds_tcp_data_recv+0x990/0x1920 net/rds/tcp_recv.c:218
 tcp_read_sock+0xb52/0x26e0 net/ipv4/tcp.c:1646
 rds_tcp_read_sock net/rds/tcp_recv.c:276 [inline]
 rds_tcp_data_ready+0x29d/0x6c0 net/rds/tcp_recv.c:325
 tcp_data_ready net/ipv4/tcp_input.c:4795 [inline]
 tcp_rcv_established+0x43e4/0x4480 net/ipv4/tcp_input.c:5724
 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:finish_lock_switch+0x2b/0x40 kernel/sched/core.c:3198
Code: 48 89 e5 53 48 89 fb e8 c3 d8 b9 00 8b b8 88 0c 00 00 48 8b 00 48 85 c0 75 12 48 89 df e8 4d d2 b9 00 c6 00 00 c6 03 00 fb 5b <5d> c3 e8 fe d7 b9 00 eb e7 66 90 66 2e 0f 1f 84 00 00 00 00 00 55
RSP: 0018:ffff88812dfabcf8 EFLAGS: 00000282
RAX: ffff88821fdb2340 RBX: ffff8881020b3d00 RCX: 000000021fd13340
RDX: ffff88821fd13340 RSI: 00000000000004a0 RDI: ffff88812fd94340
RBP: ffff88812dfabcf8 R08: ffffea000000000f R09: ffff88812fffa000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88812dfa09d8
R13: ffff88812dfa0000 R14: 0000000000000001 R15: ffff88812fd94340
 finish_task_switch+0xd2/0x2f0 kernel/sched/core.c:3303
 context_switch kernel/sched/core.c:3467 [inline]
 __schedule+0x4ae/0x520 kernel/sched/core.c:4195
 schedule+0x260/0x330 kernel/sched/core.c:4270
 smpboot_thread_fn+0x7c6/0xa90 kernel/smpboot.c:161
 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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