===================================================== BUG: KMSAN: uninit-value in br_dev_xmit+0x8eb/0x1f60 net/bridge/br_device.c:64 br_dev_xmit+0x8eb/0x1f60 net/bridge/br_device.c:64 __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_common net/core/filter.c:2153 [inline] __bpf_redirect+0x15f0/0x1840 net/core/filter.c:2160 ____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 Uninit was created at: slab_post_alloc_hook mm/slab.h:524 [inline] slab_alloc_node mm/slub.c:3251 [inline] __kmalloc_node_track_caller+0xe0c/0x1510 mm/slub.c:4974 kmalloc_reserve net/core/skbuff.c:354 [inline] pskb_expand_head+0x26a/0x1ca0 net/core/skbuff.c:1701 skb_ensure_writable+0x501/0x5b0 net/core/skbuff.c:5695 __bpf_try_make_writable net/core/filter.c:1655 [inline] bpf_try_make_writable net/core/filter.c:1661 [inline] bpf_try_make_head_writable net/core/filter.c:1669 [inline] ____bpf_clone_redirect net/core/filter.c:2423 [inline] bpf_clone_redirect+0x25d/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 CPU: 1 PID: 3785 Comm: syz-executor.2 Not tainted 5.16.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 =====================================================