=====================================================
BUG: KMSAN: uninit-value in eth_type_trans+0x6a2/0x9b0 net/ethernet/eth.c:176
 eth_type_trans+0x6a2/0x9b0 net/ethernet/eth.c:176
 loopback_xmit+0x4d2/0x720 drivers/net/loopback.c:87
 __netdev_start_xmit include/linux/netdevice.h:5275 [inline]
 netdev_start_xmit include/linux/netdevice.h:5284 [inline]
 xmit_one net/core/dev.c:3871 [inline]
 dev_hard_start_xmit+0x24e/0xad0 net/core/dev.c:3887
 sch_direct_xmit+0x3b2/0xcf0 net/sched/sch_generic.c:347
 qdisc_restart net/sched/sch_generic.c:412 [inline]
 __qdisc_run+0x1919/0x2830 net/sched/sch_generic.c:420
 qdisc_run include/net/pkt_sched.h:120 [inline]
 __dev_xmit_skb net/core/dev.c:4269 [inline]
 __dev_queue_xmit+0x2c11/0x5980 net/core/dev.c:4802
 dev_queue_xmit include/linux/netdevice.h:3384 [inline]
 __bpf_tx_skb net/core/filter.c:2152 [inline]
 __bpf_redirect_common net/core/filter.c:2196 [inline]
 __bpf_redirect+0x162e/0x1760 net/core/filter.c:2203
 ____bpf_clone_redirect net/core/filter.c:2486 [inline]
 bpf_clone_redirect+0x4a6/0x6c0 net/core/filter.c:2449
 ___bpf_prog_run+0x12af/0xeb60 kernel/bpf/core.c:2040
 __bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2336
 bpf_dispatcher_nop_func include/linux/bpf.h:1402 [inline]
 __bpf_prog_run include/linux/filter.h:723 [inline]
 bpf_prog_run include/linux/filter.h:730 [inline]
 bpf_test_run+0x493/0xdf0 net/bpf/test_run.c:423
 bpf_prog_test_run_skb+0x22a5/0x3050 net/bpf/test_run.c:1159
 bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4722
 __sys_bpf+0x925/0xee0 kernel/bpf/syscall.c:6246
 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6339 [inline]
 __x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6339
 x64_sys_call+0x13d0/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4522 [inline]
 slab_alloc_node mm/slub.c:4844 [inline]
 kmem_cache_alloc_node_noprof+0x3cd/0x12d0 mm/slub.c:4896
 kmalloc_reserve net/core/skbuff.c:613 [inline]
 __alloc_skb+0x855/0x1190 net/core/skbuff.c:713
 skb_copy+0x1c4/0xb70 net/core/skbuff.c:2195
 skb_unshare include/linux/skbuff.h:2168 [inline]
 netem_enqueue+0x4765/0x5030 net/sched/sch_netem.c:510
 dev_qdisc_enqueue net/core/dev.c:4151 [inline]
 __dev_xmit_skb net/core/dev.c:4266 [inline]
 __dev_queue_xmit+0x25ad/0x5980 net/core/dev.c:4802
 dev_queue_xmit include/linux/netdevice.h:3384 [inline]
 __bpf_tx_skb net/core/filter.c:2152 [inline]
 __bpf_redirect_common net/core/filter.c:2196 [inline]
 __bpf_redirect+0x162e/0x1760 net/core/filter.c:2203
 ____bpf_clone_redirect net/core/filter.c:2486 [inline]
 bpf_clone_redirect+0x4a6/0x6c0 net/core/filter.c:2449
 ___bpf_prog_run+0x12af/0xeb60 kernel/bpf/core.c:2040
 __bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2336
 bpf_dispatcher_nop_func include/linux/bpf.h:1402 [inline]
 __bpf_prog_run include/linux/filter.h:723 [inline]
 bpf_prog_run include/linux/filter.h:730 [inline]
 bpf_test_run+0x493/0xdf0 net/bpf/test_run.c:423
 bpf_prog_test_run_skb+0x22a5/0x3050 net/bpf/test_run.c:1159
 bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4722
 __sys_bpf+0x925/0xee0 kernel/bpf/syscall.c:6246
 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6339 [inline]
 __x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6339
 x64_sys_call+0x13d0/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 15104 Comm: syz.8.2966 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
=====================================================