=====================================================
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:726
 __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:362
 ip_find net/ipv4/ip_fragment.c:216 [inline]
 ip_defrag+0x498/0x3d60 net/ipv4/ip_fragment.c:484
 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+0x184/0x480 net/netfilter/core.c:619
 nf_hook include/linux/netfilter.h:262 [inline]
 __ip_local_out+0x779/0x830 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+0x3392/0x3b20 net/ipv4/ip_tunnel.c:810
 __gre_xmit net/ipv4/ip_gre.c:471 [inline]
 ipgre_xmit+0x1270/0x1300 net/ipv4/ip_gre.c:658
 __netdev_start_xmit include/linux/netdevice.h:4994 [inline]
 netdev_start_xmit include/linux/netdevice.h:5008 [inline]
 xmit_one+0x2f4/0x840 net/core/dev.c:3590
 dev_hard_start_xmit+0x186/0x440 net/core/dev.c:3606
 __dev_queue_xmit+0x2104/0x3290 net/core/dev.c:4229
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4262
 __bpf_tx_skb net/core/filter.c:2114 [inline]
 __bpf_redirect_no_mac net/core/filter.c:2139 [inline]
 __bpf_redirect+0x8fc/0x1840 net/core/filter.c:2162
 ____bpf_clone_redirect net/core/filter.c:2429 [inline]
 bpf_clone_redirect+0x4a5/0x660 net/core/filter.c:2401
 ___bpf_prog_run+0x92d/0xb420 kernel/bpf/core.c:1558
 __bpf_prog_run512+0x121/0x180 kernel/bpf/core.c:1797
 bpf_dispatcher_nop_func include/linux/bpf.h:727 [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:3349
 __sys_bpf+0xada/0x1230 kernel/bpf/syscall.c:4651
 __do_sys_bpf kernel/bpf/syscall.c:4737 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4735 [inline]
 __ia32_sys_bpf+0xe1/0x130 kernel/bpf/syscall.c:4735
 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:206 [inline]
 ip_defrag+0x306/0x3d60 net/ipv4/ip_fragment.c:484
 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: 1 PID: 6105 Comm: syz-executor.0 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================