===================================================== BUG: KMSAN: uninit-value in update_stack_state+0x1ee/0xb40 arch/x86/kernel/unwind_frame.c:202 CPU: 1 PID: 12653 Comm: syz-executor646 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:__msan_instrument_asm_store+0xfd/0x120 mm/kmsan/kmsan_instr.c:78 Code: 89 df 4c 89 f6 31 d2 e8 91 f3 ff ff be ff ff ff ff 65 0f c1 35 24 e5 b1 74 ff ce 75 1a e8 eb 70 2e ff 4c 89 7d e0 ff 75 e0 9d <48> 83 c4 10 5b 41 5e 41 5f 5d c3 0f 0b 48 c7 c7 2a 29 ca 98 31 c0 RSP: 0018:ffffb9c503226b98 EFLAGS: 00000282 RAX: ffffc9c503226be0 RBX: ffffb9c503226be0 RCX: 0000000000000003 RDX: 0000000000000002 RSI: 0000000000000000 RDI: ffffb9c503226be0 RBP: ffffb9c503226bc0 R08: 0000000000000002 R09: ffffc1c503226be0 R10: 0000000000000004 R11: 0000000000000000 R12: ffffa3a50809c6d8 R13: 0000000000000200 R14: 0000000000000008 R15: 0000000000000282 native_save_fl arch/x86/include/asm/irqflags.h:29 [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+0xf7/0x1d0 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_setsockopt_connectx net/sctp/socket.c:1343 [inline] sctp_getsockopt_connectx3 net/sctp/socket.c:1428 [inline] sctp_getsockopt+0xf33a/0x19b50 net/sctp/socket.c:8099 compat_sock_common_getsockopt+0x23e/0x260 net/core/sock.c:3234 __compat_sys_getsockopt+0x3d4/0x4b0 net/compat.c:439 __do_compat_sys_getsockopt net/compat.c:449 [inline] __se_compat_sys_getsockopt+0xe1/0x100 net/compat.c:446 __ia32_compat_sys_getsockopt+0x62/0x80 net/compat.c:446 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: 0023:0xf7f44549 Code: Bad RIP value. RSP: 002b:00000000f7f1e1ec EFLAGS: 00000246 ORIG_RAX: 000000000000016d RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000084 RDX: 000000000000006f RSI: 0000000020000000 RDI: 0000000020000180 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 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 =====================================================