===================================================== BUG: KMSAN: uninit-value in update_stack_state+0x1ee/0xb40 arch/x86/kernel/unwind_frame.c:202 CPU: 1 PID: 17378 Comm: syz-executor.5 Not tainted 5.8.0-rc5-syzkaller #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+0x1df/0x240 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+0x33e/0x3e0 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+0x38b/0x1b00 net/core/skbuff.c:1636 ___pskb_trim+0x276/0x1730 net/core/skbuff.c:1934 __pskb_trim include/linux/skbuff.h:2682 [inline] pskb_trim include/linux/skbuff.h:2689 [inline] sk_filter_trim_cap+0x5d0/0xcc0 net/core/filter.c:121 tcp_filter net/ipv4/tcp_ipv4.c:1849 [inline] tcp_v4_rcv+0x4098/0x5040 net/ipv4/tcp_ipv4.c:2002 ip_protocol_deliver_rcu+0x4b7/0xbc0 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+0x62a/0x7c0 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+0x6cf/0x750 net/ipv4/ip_input.c:539 __netif_receive_skb_one_core net/core/dev.c:5281 [inline] __netif_receive_skb net/core/dev.c:5395 [inline] process_backlog+0xfb5/0x14e0 net/core/dev.c:6239 napi_poll net/core/dev.c:6684 [inline] net_rx_action+0x746/0x1aa0 net/core/dev.c:6752 __do_softirq+0x311/0x83d kernel/softirq.c:293 asm_call_on_stack+0x12/0x20 arch/x86/entry/entry_64.S:711 __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:native_save_fl arch/x86/include/asm/irqflags.h:35 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:79 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:120 [inline] RIP: 0010:kmsan_enter_runtime mm/kmsan/kmsan.h:84 [inline] RIP: 0010:__msan_poison_alloca+0x89/0x120 mm/kmsan/kmsan_instr.c:188 Code: 41 00 00 48 89 44 24 20 48 89 5c 24 28 48 8b 45 08 48 89 44 24 30 bf 01 00 00 00 e8 11 fb ff ff 48 89 44 24 38 9c 8f 44 24 18 <48> 8b 44 24 18 48 89 44 24 08 fa e8 e7 6d 2e ff 65 44 0f c1 2d 6e RSP: 0018:ffffa8984149e950 EFLAGS: 00000246 RAX: ffffffff82b863fa RBX: ffffffff9128adf0 RCX: 0000000000000000 RDX: 0000000000000008 RSI: 00000000ffffffff RDI: 0000000000000001 RBP: ffffa8984149e9c8 R08: ffffd16f4000000f R09: ffffb0984149e9e8 R10: 0000000000000000 R11: 0000000000000000 R12: ffffa8984149e9e8 R13: 0000000000000001 R14: 0000000000000008 R15: 00000000ffffffff native_save_fl kernel/softirq.c:169 [inline] arch_local_save_flags arch/x86/include/asm/irqflags.h:79 [inline] arch_local_irq_save arch/x86/include/asm/irqflags.h:120 [inline] do_softirq kernel/softirq.c:333 [inline] __local_bh_enable_ip+0xea/0x1d0 kernel/softirq.c:190 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:723 [inline] ip_finish_output2+0x1fee/0x24a0 net/ipv4/ip_output.c:229 ip_finish_output_gso net/ipv4/ip_output.c:250 [inline] __ip_finish_output+0x7fe/0xd80 net/ipv4/ip_output.c:301 ip_finish_output+0x166/0x410 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x593/0x680 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:443 [inline] ip_local_out net/ipv4/ip_output.c:125 [inline] __ip_queue_xmit+0x1b5c/0x21a0 net/ipv4/ip_output.c:530 ip_queue_xmit+0xcc/0xf0 include/net/ip.h:237 __tcp_transmit_skb+0x440e/0x6090 net/ipv4/tcp_output.c:1240 tcp_transmit_skb net/ipv4/tcp_output.c:1256 [inline] tcp_write_xmit+0x30b1/0xb430 net/ipv4/tcp_output.c:2519 __tcp_push_pending_frames+0x124/0x4e0 net/ipv4/tcp_output.c:2694 tcp_push_pending_frames include/net/tcp.h:1857 [inline] tcp_data_snd_check+0x160/0x9c0 net/ipv4/tcp_input.c:5264 tcp_rcv_established+0x13de/0x3280 net/ipv4/tcp_input.c:5755 tcp_v4_do_rcv+0x6ce/0xd70 net/ipv4/tcp_ipv4.c:1641 sk_backlog_rcv include/net/sock.h:997 [inline] __release_sock+0x2a3/0x5c0 net/core/sock.c:2550 release_sock+0x99/0x2a0 net/core/sock.c:3066 sk_stream_wait_memory+0x987/0x1310 net/core/stream.c:145 tcp_sendmsg_locked+0x1bdd/0x6d00 net/ipv4/tcp.c:1401 tcp_sendmsg+0xb2/0x100 net/ipv4/tcp.c:1441 inet_sendmsg+0x178/0x2e0 net/ipv4/af_inet.c:814 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] __sys_sendto+0xade/0xc90 net/socket.c:1995 __do_sys_sendto net/socket.c:2007 [inline] __se_sys_sendto+0x107/0x130 net/socket.c:2003 __ia32_sys_sendto+0x6e/0x90 net/socket.c:2003 do_syscall_32_irqs_on arch/x86/entry/common.c:430 [inline] __do_fast_syscall_32+0x2aa/0x400 arch/x86/entry/common.c:477 do_fast_syscall_32+0x6b/0xd0 arch/x86/entry/common.c:505 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:554 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f56549 Code: Bad RIP value. RSP: 002b:00000000f5d510cc EFLAGS: 00000296 ORIG_RAX: 0000000000000171 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000200012c0 RDX: 000000000000fe6a RSI: 000000000000000e RDI: 0000000000000000 RBP: 00000000fffffe2b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Local variable ----iph@ip_vs_in created at: ip_vs_in+0xab/0x2ed0 net/netfilter/ipvs/ip_vs_core.c:1985 ip_vs_in+0xab/0x2ed0 net/netfilter/ipvs/ip_vs_core.c:1985 =====================================================