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BUG: KMSAN: uninit-value in do_ip_vs_set_ctl+0x19c2/0x34a0 net/netfilter/ipvs/ip_vs_ctl.c:2537
CPU: 0 PID: 13935 Comm: syz-executor.1 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
 dccp_setsockopt+0x43f/0x1960 net/dccp/proto.c:578
 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: 0023:0xf7f6e549
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:00000000f55680cc 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
 dccp_setsockopt+0x43f/0x1960 net/dccp/proto.c:578
 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
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