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BUG: KMSAN: uninit-value in packet_rcv_fanout+0x2442/0x25c0 net/packet/af_packet.c:1463
CPU: 0 PID: 14882 Comm: syz-executor.5 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 packet_rcv_fanout+0x2442/0x25c0 net/packet/af_packet.c:1463
 dev_queue_xmit_nit+0x11a0/0x1280 net/core/dev.c:2355
 xmit_one net/core/dev.c:3552 [inline]
 dev_hard_start_xmit+0x20c/0xa70 net/core/dev.c:3572
 __dev_queue_xmit+0x2f8d/0x3b20 net/core/dev.c:4131
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4164
 __bpf_tx_skb net/core/filter.c:2086 [inline]
 __bpf_redirect_no_mac net/core/filter.c:2111 [inline]
 __bpf_redirect+0xaff/0x1440 net/core/filter.c:2134
 ____bpf_clone_redirect net/core/filter.c:2165 [inline]
 bpf_clone_redirect+0x466/0x620 net/core/filter.c:2137
 ___bpf_prog_run+0x214d/0x97a0 kernel/bpf/core.c:1516
 __bpf_prog_run512+0x101/0x170 kernel/bpf/core.c:1683
 bpf_test_run+0x58c/0xdb0 net/bpf/test_run.c:49
 bpf_prog_test_run_skb+0xe69/0x27c0 net/bpf/test_run.c:459
 bpf_prog_test_run kernel/bpf/syscall.c:2983 [inline]
 __do_sys_bpf+0xa6bc/0x16ac0 kernel/bpf/syscall.c:4135
 __se_sys_bpf+0x8e/0xa0 kernel/bpf/syscall.c:4075
 __ia32_sys_bpf+0x4a/0x70 kernel/bpf/syscall.c:4075
 do_syscall_32_irqs_on arch/x86/entry/common.c:430 [inline]
 __do_fast_syscall_32+0x2aa/0x400 arch/x86/entry/common.c:477
 do_fast_syscall_32+0x6b/0xd0 arch/x86/entry/common.c:505
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:554
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7fc3549
Code: Bad RIP value.
RSP: 002b:00000000f5dbe0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000165
RAX: ffffffffffffffda RBX: 000000000000000a RCX: 0000000020000080
RDX: 0000000000000027 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310
 __msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:165
 ___bpf_prog_run+0x6c64/0x97a0 kernel/bpf/core.c:1391
 __bpf_prog_run32+0x101/0x170 kernel/bpf/core.c:1681
 bpf_dispatcher_nop_func include/linux/bpf.h:556 [inline]
 bpf_prog_run_pin_on_cpu include/linux/filter.h:597 [inline]
 bpf_prog_run_clear_cb include/linux/filter.h:719 [inline]
 fanout_demux_bpf net/packet/af_packet.c:1404 [inline]
 packet_rcv_fanout+0x51e/0x25c0 net/packet/af_packet.c:1456
 dev_queue_xmit_nit+0x11a0/0x1280 net/core/dev.c:2355
 xmit_one net/core/dev.c:3552 [inline]
 dev_hard_start_xmit+0x20c/0xa70 net/core/dev.c:3572
 __dev_queue_xmit+0x2f8d/0x3b20 net/core/dev.c:4131
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4164
 __bpf_tx_skb net/core/filter.c:2086 [inline]
 __bpf_redirect_no_mac net/core/filter.c:2111 [inline]
 __bpf_redirect+0xaff/0x1440 net/core/filter.c:2134
 ____bpf_clone_redirect net/core/filter.c:2165 [inline]
 bpf_clone_redirect+0x466/0x620 net/core/filter.c:2137
 ___bpf_prog_run+0x214d/0x97a0 kernel/bpf/core.c:1516
 __bpf_prog_run512+0x101/0x170 kernel/bpf/core.c:1683
 bpf_test_run+0x58c/0xdb0 net/bpf/test_run.c:49
 bpf_prog_test_run_skb+0xe69/0x27c0 net/bpf/test_run.c:459
 bpf_prog_test_run kernel/bpf/syscall.c:2983 [inline]
 __do_sys_bpf+0xa6bc/0x16ac0 kernel/bpf/syscall.c:4135
 __se_sys_bpf+0x8e/0xa0 kernel/bpf/syscall.c:4075
 __ia32_sys_bpf+0x4a/0x70 kernel/bpf/syscall.c:4075
 do_syscall_32_irqs_on arch/x86/entry/common.c:430 [inline]
 __do_fast_syscall_32+0x2aa/0x400 arch/x86/entry/common.c:477
 do_fast_syscall_32+0x6b/0xd0 arch/x86/entry/common.c:505
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:554
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Local variable ----regs@__bpf_prog_run32 created at:
 __bpf_prog_run32+0x87/0x170 kernel/bpf/core.c:1681
 __bpf_prog_run32+0x87/0x170 kernel/bpf/core.c:1681
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