===================================================== BUG: KMSAN: uninit-value in update_stack_state+0x1ee/0xb40 arch/x86/kernel/unwind_frame.c:202 CPU: 0 PID: 13536 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 sctp_init_addrs+0x91/0xf0 net/sctp/sm_make_chunk.c:1364 sctp_rcv+0x443e/0x5410 net/sctp/input.c:222 ip_protocol_deliver_rcu+0x700/0xbc0 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_shadow_origin_ptr+0x81/0xb0 mm/kmsan/kmsan_shadow.c:154 Code: 31 d2 e8 52 d8 ff ff 84 c0 74 40 4c 89 f7 31 d2 e8 44 00 00 00 48 85 c0 74 be 48 89 c3 4c 89 f7 ba 01 00 00 00 e8 2f 00 00 00 <48> 89 c2 eb c1 45 0f b6 c7 48 c7 c7 b4 06 4a 94 48 c7 c6 d5 06 4a RSP: 0018:ffffb4d9c1f6ae88 EFLAGS: 00000282 RAX: ffffc4d9c1f6aed0 RBX: ffffbcd9c1f6aed0 RCX: ffffbcd9c1f6aed0 RDX: ffffbcd9bfffffff RSI: 0000000000000008 RDI: ffffb4d9c1f6aed0 RBP: ffffb4d9c1f6aea0 R08: 0000000000000002 R09: ffffbcd9c1f6aed0 R10: 0000000000000004 R11: ffffffff862156b0 R12: ffff8f7c8b6e6558 R13: 0000000000000282 R14: ffffb4d9c1f6aed0 R15: 0000000000000000 __msan_metadata_ptr_for_load_8+0x10/0x20 mm/kmsan/kmsan_instr.c:55 native_save_fl arch/x86/include/asm/irqflags.h:35 [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+0x107/0x1d0 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 sctp_v4_xmit+0x255/0x2f0 net/sctp/protocol.c:992 sctp_packet_transmit+0x3e6b/0x4380 net/sctp/output.c:629 sctp_packet_singleton net/sctp/outqueue.c:773 [inline] sctp_outq_flush_ctrl net/sctp/outqueue.c:904 [inline] sctp_outq_flush+0x98d/0x5ca0 net/sctp/outqueue.c:1186 sctp_outq_uncork+0xd0/0xf0 net/sctp/outqueue.c:758 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1801 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1185 [inline] sctp_do_sm+0x93d1/0x9a60 net/sctp/sm_sideeffect.c:1156 sctp_primitive_ASSOCIATE+0x172/0x1a0 net/sctp/primitive.c:73 __sctp_connect+0x19cb/0x1ef0 net/sctp/socket.c:1234 sctp_connect net/sctp/socket.c:4915 [inline] sctp_inet_connect+0x2dd/0x330 net/sctp/socket.c:4930 __sys_connect_file net/socket.c:1854 [inline] __sys_connect+0x6f7/0x770 net/socket.c:1871 __do_sys_connect net/socket.c:1882 [inline] __se_sys_connect+0x8d/0xb0 net/socket.c:1879 __x64_sys_connect+0x4a/0x70 net/socket.c:1879 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:00007f3992eedc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00000000000022c0 RCX: 000000000045c1d9 RDX: 000000000000001c RSI: 0000000020000040 RDI: 0000000000000003 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 0000000000c9fb6f R14: 00007f3992eee9c0 R15: 000000000078bf0c Local variable ----_inithdr@nf_conntrack_sctp_packet created at: nf_conntrack_sctp_packet+0x20c4/0x3030 net/netfilter/nf_conntrack_proto_sctp.c:456 nf_conntrack_sctp_packet+0x20c4/0x3030 net/netfilter/nf_conntrack_proto_sctp.c:456 =====================================================