=====================================================
BUG: KMSAN: uninit-value in memcmp lib/string.c:778 [inline]
BUG: KMSAN: uninit-value in bcmp+0x14e/0x290 lib/string.c:810
 memcmp lib/string.c:778 [inline]
 bcmp+0x14e/0x290 lib/string.c:810
 ip4_obj_cmpfn+0x93/0x110 net/ipv4/ip_fragment.c:727
 __rhashtable_lookup include/linux/rhashtable.h:601 [inline]
 rhashtable_lookup include/linux/rhashtable.h:638 [inline]
 inet_frag_find+0x591/0x2a60 net/ipv4/inet_fragment.c:364
 ip_find net/ipv4/ip_fragment.c:217 [inline]
 ip_defrag+0x49b/0x3d10 net/ipv4/ip_fragment.c:485
 nf_ct_ipv4_gather_frags net/ipv4/netfilter/nf_defrag_ipv4.c:31 [inline]
 ipv4_conntrack_defrag+0x885/0xa30 net/ipv4/netfilter/nf_defrag_ipv4.c:86
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0x184/0x490 net/netfilter/core.c:619
 nf_hook include/linux/netfilter.h:262 [inline]
 __ip_local_out+0x791/0x850 net/ipv4/ip_output.c:115
 ip_local_out+0xa3/0x1f0 net/ipv4/ip_output.c:124
 iptunnel_xmit+0xaaf/0x10e0 net/ipv4/ip_tunnel_core.c:82
 ip_tunnel_xmit+0x33a2/0x3b30 net/ipv4/ip_tunnel.c:810
 __gre_xmit net/ipv4/ip_gre.c:471 [inline]
 ipgre_xmit+0x127b/0x1300 net/ipv4/ip_gre.c:659
 __netdev_start_xmit include/linux/netdevice.h:4683 [inline]
 netdev_start_xmit include/linux/netdevice.h:4697 [inline]
 xmit_one+0x2f4/0x840 net/core/dev.c:3473
 dev_hard_start_xmit+0x186/0x440 net/core/dev.c:3489
 __dev_queue_xmit+0x2123/0x3310 net/core/dev.c:4116
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4149
 __bpf_tx_skb net/core/filter.c:2113 [inline]
 __bpf_redirect_no_mac net/core/filter.c:2138 [inline]
 __bpf_redirect+0x913/0x1820 net/core/filter.c:2161
 ____bpf_clone_redirect net/core/filter.c:2428 [inline]
 bpf_clone_redirect+0x4a5/0x670 net/core/filter.c:2400
 ___bpf_prog_run+0x92d/0xb420 kernel/bpf/core.c:1558
 __bpf_prog_run512+0x121/0x180 kernel/bpf/core.c:1798
 bpf_dispatcher_nop_func include/linux/bpf.h:785 [inline]
 __bpf_prog_run include/linux/filter.h:626 [inline]
 bpf_prog_run include/linux/filter.h:633 [inline]
 bpf_test_run+0x762/0x1040 net/bpf/test_run.c:120
 bpf_prog_test_run_skb+0x15c9/0x2100 net/bpf/test_run.c:666
 bpf_prog_test_run+0x784/0x820 kernel/bpf/syscall.c:3350
 __sys_bpf+0xadd/0x1240 kernel/bpf/syscall.c:4652
 __do_sys_bpf kernel/bpf/syscall.c:4738 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4736 [inline]
 __ia32_sys_bpf+0xe1/0x130 kernel/bpf/syscall.c:4736
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Local variable key.i created at:
 ip_find net/ipv4/ip_fragment.c:207 [inline]
 ip_defrag+0x309/0x3d10 net/ipv4/ip_fragment.c:485
 nf_ct_ipv4_gather_frags net/ipv4/netfilter/nf_defrag_ipv4.c:31 [inline]
 ipv4_conntrack_defrag+0x885/0xa30 net/ipv4/netfilter/nf_defrag_ipv4.c:86

CPU: 0 PID: 28965 Comm: syz-executor.2 Not tainted 5.17.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================