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BUG: KMSAN: uninit-value in ip_vs_lblcr_check_expire+0x1551/0x1600 net/netfilter/ipvs/ip_vs_lblcr.c:479
CPU: 0 PID: 14732 Comm: syz-executor2 Not tainted 4.17.0+ #22
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:990
 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:640
 ip_vs_lblcr_check_expire+0x1551/0x1600 net/netfilter/ipvs/ip_vs_lblcr.c:479
 call_timer_fn+0x280/0x5d0 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers+0xd96/0x11b0 kernel/time/timer.c:1666
 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692
 __do_softirq+0x592/0x979 kernel/softirq.c:285
 invoke_softirq kernel/softirq.c:366 [inline]
 irq_exit+0x207/0x240 kernel/softirq.c:407
 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:525
 smp_apic_timer_interrupt+0x64/0x90 arch/x86/kernel/apic/apic.c:1055
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:868
 </IRQ>
RIP: 0010:native_restore_fl arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:78 [inline]
RIP: 0010:__msan_poison_alloca+0x165/0x200 mm/kmsan/kmsan_instr.c:607
RSP: 0018:ffff8801b5d0f950 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000081000000 RBX: 0000000081000000 RCX: ffff8801b5d0f990
RDX: 0000000000000004 RSI: 0000000000000004 RDI: 00000000bd032155
RBP: ffff8801b5d0f9f0 R08: 0000000001080020 R09: 0000000000000002
R10: ffffffff7fffffff R11: ffffffff81351e50 R12: 0000000000000008
R13: 0000000000000000 R14: 0000000000000246 R15: ffff880198b1d7c0
 rcu_all_qs+0x32/0x1f0 kernel/rcu/tree.c:478
 _cond_resched+0x3c/0xd0 kernel/sched/core.c:5002
 inet_twsk_purge+0x175/0xc90 net/ipv4/inet_timewait_sock.c:266
 dccp_v6_exit_batch+0x31/0x40 net/dccp/ipv6.c:1113
 ops_exit_list net/core/net_namespace.c:155 [inline]
 setup_net+0x9f0/0xfa0 net/core/net_namespace.c:330
 copy_net_ns+0x464/0x8c0 net/core/net_namespace.c:436
 create_new_namespaces+0x7f5/0xe80 kernel/nsproxy.c:107
 unshare_nsproxy_namespaces+0x23b/0x320 kernel/nsproxy.c:206
 ksys_unshare+0x889/0x10f0 kernel/fork.c:2409
 __do_sys_unshare kernel/fork.c:2477 [inline]
 __se_sys_unshare kernel/fork.c:2475 [inline]
 __x64_sys_unshare+0x59/0x80 kernel/fork.c:2475
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455ba9
RSP: 002b:00007f55d2645c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f55d26466d4 RCX: 0000000000455ba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000064000400
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c27c3 R14: 00000000004d3f78 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
 kmsan_internal_alloc_meta_for_pages+0x146/0x700 mm/kmsan/kmsan.c:702
 kmsan_alloc_page+0x75/0xd0 mm/kmsan/kmsan_hooks.c:250
 __alloc_pages_nodemask+0xf7b/0x5cc0 mm/page_alloc.c:4404
 alloc_pages_current+0x6b1/0x970 mm/mempolicy.c:2093
 alloc_pages include/linux/gfp.h:494 [inline]
 kmalloc_order mm/slab_common.c:1148 [inline]
 kmalloc_order_trace+0xbb/0x390 mm/slab_common.c:1159
 kmalloc_large include/linux/slab.h:446 [inline]
 __kmalloc+0x335/0x350 mm/slub.c:3805
 kmalloc include/linux/slab.h:517 [inline]
 ip_vs_lblcr_init_svc+0x57/0x310 net/netfilter/ipvs/ip_vs_lblcr.c:518
 ip_vs_bind_scheduler+0xa9/0x1f0 net/netfilter/ipvs/ip_vs_sched.c:51
 ip_vs_add_service+0xa9d/0x1d90 net/netfilter/ipvs/ip_vs_ctl.c:1265
 do_ip_vs_set_ctl+0x2aa9/0x2cd0 net/netfilter/ipvs/ip_vs_ctl.c:2462
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x47c/0x4e0 net/netfilter/nf_sockopt.c:115
 ip_setsockopt+0x24b/0x2b0 net/ipv4/ip_sockglue.c:1251
 tcp_setsockopt+0x1c0/0x1f0 net/ipv4/tcp.c:2891
 sock_common_setsockopt+0x13b/0x170 net/core/sock.c:3039
 __sys_setsockopt+0x496/0x540 net/socket.c:1903
 __do_sys_setsockopt net/socket.c:1914 [inline]
 __se_sys_setsockopt net/socket.c:1911 [inline]
 __x64_sys_setsockopt+0x15c/0x1c0 net/socket.c:1911
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
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