syzbot

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BUG: KMSAN: uninit-value in eth_type_trans+0x69d/0x9a0 net/ethernet/eth.c:176
 eth_type_trans+0x69d/0x9a0 net/ethernet/eth.c:176
 __dev_forward_skb2+0x4b1/0x950 net/core/dev.c:2423
 dev_forward_skb_nomtu+0x3b/0xe0 net/core/dev.c:2462
 __bpf_rx_skb net/core/filter.c:2122 [inline]
 __bpf_redirect_common net/core/filter.c:2197 [inline]
 __bpf_redirect+0x14d6/0x1760 net/core/filter.c:2204
 ____bpf_clone_redirect net/core/filter.c:2480 [inline]
 bpf_clone_redirect+0x366/0x530 net/core/filter.c:2450
 ___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2000
 __bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2296
 bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline]
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run include/linux/filter.h:728 [inline]
 bpf_test_run+0x496/0xd80 net/bpf/test_run.c:423
 bpf_prog_test_run_skb+0x18c1/0x26a0 net/bpf/test_run.c:1091
 bpf_prog_test_run+0x5c2/0xa40 kernel/bpf/syscall.c:4688
 __sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6167
 __do_sys_bpf kernel/bpf/syscall.c:6259 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6257 [inline]
 __x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6257
 x64_sys_call+0x3550/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0xfa0 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:4969 [inline]
 slab_alloc_node mm/slub.c:5272 [inline]
 kmem_cache_alloc_node_noprof+0x989/0x16b0 mm/slub.c:5324
 kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:579
 pskb_expand_head+0x1fc/0x1610 net/core/skbuff.c:2241
 skb_ensure_writable+0x44e/0x510 net/core/skbuff.c:6273
 __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:2474 [inline]
 bpf_clone_redirect+0x1c1/0x530 net/core/filter.c:2450
 ___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2000
 __bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2296
 bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline]
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run include/linux/filter.h:728 [inline]
 bpf_test_run+0x496/0xd80 net/bpf/test_run.c:423
 bpf_prog_test_run_skb+0x18c1/0x26a0 net/bpf/test_run.c:1091
 bpf_prog_test_run+0x5c2/0xa40 kernel/bpf/syscall.c:4688
 __sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6167
 __do_sys_bpf kernel/bpf/syscall.c:6259 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6257 [inline]
 __x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6257
 x64_sys_call+0x3550/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 6056 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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