===================================================== BUG: KMSAN: uninit-value in do_ip_vs_set_ctl+0x19c2/0x34a0 net/netfilter/ipvs/ip_vs_ctl.c:2537 CPU: 0 PID: 15323 Comm: syz-executor.3 Not tainted 5.9.0-rc8-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+0x21c/0x280 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:122 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:201 do_ip_vs_set_ctl+0x19c2/0x34a0 net/netfilter/ipvs/ip_vs_ctl.c:2537 nf_setsockopt+0x588/0x5e0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0x6412/0x8ae0 net/ipv4/ip_sockglue.c:1436 udp_setsockopt+0x160/0x230 net/ipv4/udp.c:2711 ipv6_setsockopt+0x922/0xafa0 net/ipv6/ipv6_sockglue.c:998 udpv6_setsockopt+0x15b/0x220 net/ipv6/udp.c:1626 sock_common_setsockopt+0x16c/0x1b0 net/core/sock.c:3247 __sys_setsockopt+0x951/0xda0 net/socket.c:2132 __do_sys_setsockopt net/socket.c:2143 [inline] __se_sys_setsockopt+0xdd/0x100 net/socket.c:2140 __ia32_sys_setsockopt+0x62/0x80 net/socket.c:2140 do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline] __do_fast_syscall_32+0x129/0x180 arch/x86/entry/common.c:139 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f88549 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f55820cc EFLAGS: 00000296 ORIG_RAX: 000000000000016e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000480 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:129 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:297 __msan_chain_origin+0x57/0xa0 mm/kmsan/kmsan_instr.c:151 ip_vs_copy_usvc_compat net/netfilter/ipvs/ip_vs_ctl.c:2425 [inline] do_ip_vs_set_ctl+0x1296/0x34a0 net/netfilter/ipvs/ip_vs_ctl.c:2518 nf_setsockopt+0x588/0x5e0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0x6412/0x8ae0 net/ipv4/ip_sockglue.c:1436 udp_setsockopt+0x160/0x230 net/ipv4/udp.c:2711 ipv6_setsockopt+0x922/0xafa0 net/ipv6/ipv6_sockglue.c:998 udpv6_setsockopt+0x15b/0x220 net/ipv6/udp.c:1626 sock_common_setsockopt+0x16c/0x1b0 net/core/sock.c:3247 __sys_setsockopt+0x951/0xda0 net/socket.c:2132 __do_sys_setsockopt net/socket.c:2143 [inline] __se_sys_setsockopt+0xdd/0x100 net/socket.c:2140 __ia32_sys_setsockopt+0x62/0x80 net/socket.c:2140 do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline] __do_fast_syscall_32+0x129/0x180 arch/x86/entry/common.c:139 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Local variable ----arg@do_ip_vs_set_ctl created at: do_ip_vs_set_ctl+0xd9/0x34a0 net/netfilter/ipvs/ip_vs_ctl.c:2458 do_ip_vs_set_ctl+0xd9/0x34a0 net/netfilter/ipvs/ip_vs_ctl.c:2458 =====================================================