syzbot

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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
 __dev_forward_skb2+0x4b1/0x940 net/core/dev.c:2437
 dev_forward_skb_nomtu+0x3b/0xe0 net/core/dev.c:2476
 __bpf_rx_skb net/core/filter.c:2122 [inline]
 __bpf_redirect_common net/core/filter.c:2197 [inline]
 __bpf_redirect+0x14d7/0x1760 net/core/filter.c:2204
 ____bpf_clone_redirect net/core/filter.c:2487 [inline]
 bpf_clone_redirect+0x4a6/0x6c0 net/core/filter.c:2450
 ___bpf_prog_run+0x12af/0xeb60 kernel/bpf/core.c:2037
 __bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333
 bpf_dispatcher_nop_func include/linux/bpf.h:1378 [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+0x2376/0x3200 net/bpf/test_run.c:1158
 bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
 __sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
 __x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
 x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0xf80 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:4960 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_node_noprof+0x9de/0x1780 mm/slub.c:5315
 kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:586
 pskb_expand_head+0x205/0x1900 net/core/skbuff.c:2283
 skb_ensure_writable+0x44e/0x510 net/core/skbuff.c:6317
 __bpf_try_make_writable net/core/filter.c:1682 [inline]
 bpf_try_make_writable net/core/filter.c:1688 [inline]
 bpf_try_make_head_writable net/core/filter.c:1696 [inline]
 ____bpf_clone_redirect net/core/filter.c:2481 [inline]
 bpf_clone_redirect+0x301/0x6c0 net/core/filter.c:2450
 ___bpf_prog_run+0x12af/0xeb60 kernel/bpf/core.c:2037
 __bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333
 bpf_dispatcher_nop_func include/linux/bpf.h:1378 [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+0x2376/0x3200 net/bpf/test_run.c:1158
 bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
 __sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
 __x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
 x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 6036 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
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