=====================================================
BUG: KMSAN: uninit-value in ____bpf_skb_get_nlattr net/core/filter.c:144 [inline]
BUG: KMSAN: uninit-value in bpf_skb_get_nlattr+0x145/0x290 net/core/filter.c:134
CPU: 1 PID: 4893 Comm: systemd-udevd Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __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
 ____bpf_skb_get_nlattr net/core/filter.c:144 [inline]
 bpf_skb_get_nlattr+0x145/0x290 net/core/filter.c:134
 ___bpf_prog_run+0x214d/0x97a0 kernel/bpf/core.c:1516
 __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]
 run_filter net/packet/af_packet.c:2012 [inline]
 packet_rcv+0x70f/0x2150 net/packet/af_packet.c:2085
 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
 asm_call_on_stack+0x12/0x20 arch/x86/entry/entry_64.S:711
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:23 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline]
 do_softirq_own_stack+0x7c/0xa0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:390 [inline]
 __irq_exit_rcu+0x226/0x270 kernel/softirq.c:420
 irq_exit_rcu+0xe/0x10 kernel/softirq.c:432
 sysvec_apic_timer_interrupt+0x107/0x130 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:593
RIP: 0010:kmsan_get_metadata+0x1/0x180 mm/kmsan/kmsan_shadow.c:175
Code: 0f b6 c7 48 c7 c7 b4 06 8a b4 48 c7 c6 d5 06 8a b4 4c 89 f2 31 c0 e8 b0 e4 44 ff 0f 0b 66 90 66 2e 0f 1f 84 00 00 00 00 00 55 <48> 89 e5 41 57 41 56 53 41 89 d6 48 89 fb 48 83 e3 fc 85 d2 48 0f
RSP: 0018:ffffb05640d6b9c8 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffb05640d5106a RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffffb05640d5106a
RBP: ffffb05640d6b9f0 R08: ffffdd9b8000000f R09: ffff947fefffb000
R10: 0000000000000003 R11: ffffffffb3e0083d R12: 0000000000000000
R13: ffffb05640d6be18 R14: ffffb05640d5106a R15: 0000000000000000
 __msan_metadata_ptr_for_load_2+0x10/0x20 mm/kmsan/kmsan_instr.c:53
 ___bpf_prog_run+0x4171/0x97a0 kernel/bpf/core.c:1611
 __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]
 seccomp_run_filters kernel/seccomp.c:272 [inline]
 __seccomp_filter+0x59e/0x2720 kernel/seccomp.c:817
 __secure_computing+0x1fa/0x380 kernel/seccomp.c:950
 syscall_trace_enter+0x63b/0xe10 arch/x86/entry/common.c:194
 do_syscall_64+0x54/0x150 arch/x86/entry/common.c:382
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f8081a82335
Code: Bad RIP value.
RSP: 002b:00007ffc5a2ebaf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000006
RAX: ffffffffffffffda RBX: 000055d576e36930 RCX: 00007f8081a82335
RDX: 00007ffc5a2ebb30 RSI: 00007ffc5a2ebb30 RDI: 000055d576e35930
RBP: 00007ffc5a2ebbf0 R08: 00007f8081d41218 R09: 0000000000001010
R10: 0000000000000220 R11: 0000000000000246 R12: 000055d576e35930
R13: 000055d576e3594a R14: 000055d576e2ba95 R15: 000055d576e2ba9a

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+0x6cbe/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]
 run_filter net/packet/af_packet.c:2012 [inline]
 packet_rcv+0x70f/0x2150 net/packet/af_packet.c:2085
 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

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]
 run_filter net/packet/af_packet.c:2012 [inline]
 packet_rcv+0x70f/0x2150 net/packet/af_packet.c:2085
 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
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