=====================================================
BUG: KMSAN: uninit-value in erspan_build_header+0x170/0x2f0 include/net/erspan.h:197
 erspan_build_header+0x170/0x2f0 include/net/erspan.h:197
 erspan_xmit+0x1252/0x1cd0 net/ipv4/ip_gre.c:729
 __netdev_start_xmit include/linux/netdevice.h:5151 [inline]
 netdev_start_xmit include/linux/netdevice.h:5160 [inline]
 xmit_one net/core/dev.c:3800 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3816
 sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
 __dev_xmit_skb net/core/dev.c:4039 [inline]
 __dev_queue_xmit+0x30b9/0x57d0 net/core/dev.c:4615
 dev_queue_xmit include/linux/netdevice.h:3313 [inline]
 __bpf_tx_skb net/core/filter.c:2135 [inline]
 __bpf_redirect_common net/core/filter.c:2179 [inline]
 __bpf_redirect+0x1511/0x1690 net/core/filter.c:2186
 ____bpf_clone_redirect net/core/filter.c:2460 [inline]
 bpf_clone_redirect+0x37e/0x500 net/core/filter.c:2430
 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:2015
 __bpf_prog_run512+0xc5/0xf0 kernel/bpf/core.c:2258
 bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
 __bpf_prog_run include/linux/filter.h:701 [inline]
 bpf_prog_run include/linux/filter.h:708 [inline]
 bpf_test_run+0x546/0xd20 net/bpf/test_run.c:434
 bpf_prog_test_run_skb+0x18fa/0x25a0 net/bpf/test_run.c:1093
 bpf_prog_test_run+0x5e5/0xa30 kernel/bpf/syscall.c:4407
 __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5813
 __do_sys_bpf kernel/bpf/syscall.c:5902 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5900 [inline]
 __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5900
 x64_sys_call+0x329c/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4121 [inline]
 slab_alloc_node mm/slub.c:4164 [inline]
 kmem_cache_alloc_node_noprof+0x907/0xe00 mm/slub.c:4216
 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:515
 pskb_expand_head+0x21f/0x1b70 net/core/skbuff.c:2185
 __skb_cow include/linux/skbuff.h:3769 [inline]
 skb_cow_head include/linux/skbuff.h:3803 [inline]
 erspan_xmit+0x8e2/0x1cd0 net/ipv4/ip_gre.c:715
 __netdev_start_xmit include/linux/netdevice.h:5151 [inline]
 netdev_start_xmit include/linux/netdevice.h:5160 [inline]
 xmit_one net/core/dev.c:3800 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3816
 sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
 __dev_xmit_skb net/core/dev.c:4039 [inline]
 __dev_queue_xmit+0x30b9/0x57d0 net/core/dev.c:4615
 dev_queue_xmit include/linux/netdevice.h:3313 [inline]
 __bpf_tx_skb net/core/filter.c:2135 [inline]
 __bpf_redirect_common net/core/filter.c:2179 [inline]
 __bpf_redirect+0x1511/0x1690 net/core/filter.c:2186
 ____bpf_clone_redirect net/core/filter.c:2460 [inline]
 bpf_clone_redirect+0x37e/0x500 net/core/filter.c:2430
 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:2015
 __bpf_prog_run512+0xc5/0xf0 kernel/bpf/core.c:2258
 bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
 __bpf_prog_run include/linux/filter.h:701 [inline]
 bpf_prog_run include/linux/filter.h:708 [inline]
 bpf_test_run+0x546/0xd20 net/bpf/test_run.c:434
 bpf_prog_test_run_skb+0x18fa/0x25a0 net/bpf/test_run.c:1093
 bpf_prog_test_run+0x5e5/0xa30 kernel/bpf/syscall.c:4407
 __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5813
 __do_sys_bpf kernel/bpf/syscall.c:5902 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5900 [inline]
 __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5900
 x64_sys_call+0x329c/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 9399 Comm: syz.0.825 Not tainted 6.14.0-rc6-syzkaller-00016-g0fed89a961ea #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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