===================================================== BUG: KMSAN: uninit-value in update_stack_state+0x974/0xb40 arch/x86/kernel/unwind_frame.c:238 CPU: 1 PID: 14387 Comm: syz-executor.3 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+0x974/0xb40 arch/x86/kernel/unwind_frame.c:238 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:__msan_poison_alloca+0xe3/0x120 mm/kmsan/kmsan_instr.c:191 Code: 00 e8 11 c8 d0 02 65 44 0f c1 3d 48 e2 31 54 41 ff cf 75 34 89 c3 e8 bc 6d 2e ff 48 8b 44 24 08 48 89 44 24 10 ff 74 24 10 9d <4c> 89 e7 44 89 f6 89 da e8 10 f5 ff ff 48 8d 65 d8 5b 41 5c 41 5d RSP: 0018:ffffa5fb00f26e50 EFLAGS: 00000246 RAX: 0000000000000246 RBX: 0000000006d70008 RCX: ffffffffab1863fa RDX: 0000000000000a20 RSI: 000000000006f381 RDI: 000000007e78669c RBP: ffffa5fb00f26ed0 R08: 0000000000000002 R09: ffffa5fb00f26e88 R10: 0000000000000004 R11: 0000000000000000 R12: ffffa5fb00f26ef0 R13: 0000000000000001 R14: 0000000000000008 R15: 0000000000000000 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_one+0x187/0x210 net/ipv4/tcp_output.c:2708 tcp_sendmsg_locked+0x47f4/0x6d00 net/ipv4/tcp.c:1391 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 __x64_sys_sendto+0x6e/0x90 net/socket.c:2003 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007f07a5ae9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 000000000002b880 RCX: 000000000045c1d9 RDX: 000000000000fe6a RSI: 00000000200012c0 RDI: 0000000000000004 RBP: 000000000078bf58 R08: 0000000000000000 R09: 0000000000000027 R10: 000000000020c49a R11: 0000000000000246 R12: 000000000078bf0c R13: 0000000000c9fb6f R14: 00007f07a5aea9c0 R15: 000000000078bf0c Local variable ----_addrs@nf_ct_get_tuple created at: nf_ct_get_tuple+0xe1/0x1530 net/netfilter/nf_conntrack_core.c:252 nf_ct_get_tuple+0xe1/0x1530 net/netfilter/nf_conntrack_core.c:252 =====================================================