===================================================== BUG: KMSAN: uninit-value in update_stack_state+0x974/0xb40 arch/x86/kernel/unwind_frame.c:238 CPU: 1 PID: 556 Comm: kworker/u4:12 Not tainted 5.8.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: krdsd rds_connect_worker 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 kstrdup+0x140/0x1a0 mm/util.c:62 security_netlbl_sid_to_secattr+0x2f3/0x5d0 security/selinux/ss/services.c:3708 selinux_netlbl_inet_conn_request+0x126/0x520 security/selinux/netlabel.c:333 selinux_inet_conn_request+0x580/0x620 security/selinux/hooks.c:5372 security_inet_conn_request+0x111/0x200 security/security.c:2215 tcp_conn_request+0x1b23/0x4d10 net/ipv4/tcp_input.c:6676 tcp_v4_conn_request+0x19b/0x240 net/ipv4/tcp_ipv4.c:1473 tcp_v6_conn_request+0xb5/0x2d0 net/ipv6/tcp_ipv6.c:1157 tcp_rcv_state_process+0x26b/0x71c0 net/ipv4/tcp_input.c:6213 tcp_v4_do_rcv+0xb0f/0xd70 net/ipv4/tcp_ipv4.c:1663 tcp_v4_rcv+0x425c/0x5040 net/ipv4/tcp_ipv4.c:2011 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:kmsan_get_metadata+0x0/0x180 mm/kmsan/kmsan_shadow.c:175 Code: 45 0f b6 c7 48 c7 c7 b4 06 ca bc 48 c7 c6 d5 06 ca bc 4c 89 f2 31 c0 e8 b0 e2 44 ff 0f 0b 66 90 66 2e 0f 1f 84 00 00 00 00 00 <55> 48 89 e5 41 57 41 56 53 41 89 d6 48 89 fb 48 83 e3 fc 85 d2 48 RSP: 0018:ffffb4744197aeb0 EFLAGS: 00000246 RAX: 0000000000000f90 RBX: 0000000000000008 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffb4744197af90 RBP: ffffb4744197aee0 R08: fffff6468000000f R09: ffffa4076fffb000 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff R13: 0000000000000008 R14: 0000000000000001 R15: ffffb4744197af90 __msan_poison_alloca+0x58/0x120 mm/kmsan/kmsan_instr.c:180 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+0xaa7/0xd80 net/ipv4/ip_output.c:306 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_connect+0x4208/0x6830 net/ipv4/tcp_output.c:3673 tcp_v4_connect+0x21fd/0x2370 net/ipv4/tcp_ipv4.c:311 __inet_stream_connect+0x2fb/0x1340 net/ipv4/af_inet.c:658 inet_stream_connect+0x101/0x180 net/ipv4/af_inet.c:722 rds_tcp_conn_path_connect+0x8a7/0xb70 net/rds/tcp_connect.c:172 rds_connect_worker+0x2a6/0x470 net/rds/threads.c:176 process_one_work+0x1540/0x1f30 kernel/workqueue.c:2269 worker_thread+0xed2/0x23f0 kernel/workqueue.c:2415 kthread+0x515/0x550 kernel/kthread.c:292 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:293 Local variable ----buff.i.i@nf_conntrack_tcp_packet created at: tcp_sack net/netfilter/nf_conntrack_proto_tcp.c:403 [inline] tcp_in_window net/netfilter/nf_conntrack_proto_tcp.c:489 [inline] nf_conntrack_tcp_packet+0x2057/0x74b0 net/netfilter/nf_conntrack_proto_tcp.c:1091 tcp_sack net/netfilter/nf_conntrack_proto_tcp.c:403 [inline] tcp_in_window net/netfilter/nf_conntrack_proto_tcp.c:489 [inline] nf_conntrack_tcp_packet+0x2057/0x74b0 net/netfilter/nf_conntrack_proto_tcp.c:1091 =====================================================