===================================================== BUG: KMSAN: uninit-value in packet_rcv_fanout+0x2442/0x25c0 net/packet/af_packet.c:1463 CPU: 1 PID: 16 Comm: ksoftirqd/1 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 hsr_xmit net/hsr/hsr_forward.c:228 [inline] hsr_forward_do net/hsr/hsr_forward.c:285 [inline] hsr_forward_skb+0x1f07/0x31f0 net/hsr/hsr_forward.c:361 send_hsr_supervision_frame+0x10a7/0x1500 net/hsr/hsr_device.c:302 hsr_announce+0x1e2/0x370 net/hsr/hsr_device.c:330 call_timer_fn+0x218/0x510 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0xd20/0x11c0 kernel/time/timer.c:1773 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786 __do_softirq+0x311/0x83d kernel/softirq.c:293 run_ksoftirqd+0x25/0x40 kernel/softirq.c:634 smpboot_thread_fn+0x493/0x980 kernel/smpboot.c:165 kthread+0x515/0x550 kernel/kthread.c:292 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:293 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 hsr_xmit net/hsr/hsr_forward.c:228 [inline] hsr_forward_do net/hsr/hsr_forward.c:285 [inline] hsr_forward_skb+0x1f07/0x31f0 net/hsr/hsr_forward.c:361 send_hsr_supervision_frame+0x10a7/0x1500 net/hsr/hsr_device.c:302 hsr_announce+0x1e2/0x370 net/hsr/hsr_device.c:330 call_timer_fn+0x218/0x510 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0xd20/0x11c0 kernel/time/timer.c:1773 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786 __do_softirq+0x311/0x83d kernel/softirq.c:293 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 =====================================================