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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: 0 PID: 19152 Comm: syz-executor.2 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
 deliver_skb net/core/dev.c:2247 [inline]
 dev_queue_xmit_nit+0x862/0x1280 net/core/dev.c:2317
 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:finish_lock_switch+0x2b/0x40 kernel/sched/core.c:3198
Code: 48 89 e5 53 48 89 fb e8 03 d0 a6 00 8b b8 88 0c 00 00 48 8b 00 48 85 c0 75 12 48 89 df e8 8d c9 a6 00 c6 00 00 c6 03 00 fb 5b <5d> c3 e8 3e cf a6 00 eb e7 66 90 66 2e 0f 1f 84 00 00 00 00 00 55
RSP: 0000:ffffa713c2c5bc78 EFLAGS: 00000286
RAX: ffffa182dfef21c0 RBX: ffffa18277d51e80 RCX: 0000000000a9f79f
RDX: ffffa182dfe531c0 RSI: 00000000000004a0 RDI: ffffa181efc941c0
RBP: ffffa713c2c5bc78 R08: ffffc90dc000000f R09: ffffa181efffb000
R10: ffffa180fcfde000 R11: 0000000000000000 R12: ffffa18291509e80
R13: ffffa18277d52858 R14: ffffa18291509e80 R15: ffffa181efc941c0
 finish_task_switch+0xd4/0x2f0 kernel/sched/core.c:3303
 context_switch kernel/sched/core.c:3467 [inline]
 __schedule+0x752/0x840 kernel/sched/core.c:4195
 schedule+0x260/0x330 kernel/sched/core.c:4270
 freezable_schedule include/linux/freezer.h:172 [inline]
 do_nanosleep+0x244/0x940 kernel/time/hrtimer.c:1879
 hrtimer_nanosleep kernel/time/hrtimer.c:1932 [inline]
 __do_sys_nanosleep kernel/time/hrtimer.c:1966 [inline]
 __se_sys_nanosleep+0x53c/0x760 kernel/time/hrtimer.c:1953
 __x64_sys_nanosleep+0x3e/0x60 kernel/time/hrtimer.c:1953
 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45a701
Code: Bad RIP value.
RSP: 002b:0000000000c9fbc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000023
RAX: ffffffffffffffda RBX: 00000000000b2458 RCX: 000000000045a701
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000c9fbd0
RBP: 0000000000000001 R08: 000000003314e065 R09: 000000003314e069
R10: 0000000000c9fcd0 R11: 0000000000000293 R12: 000000000078bf00
R13: 000000000078c900 R14: ffffffffffffffff R15: 000000000078c0ec

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
 deliver_skb net/core/dev.c:2247 [inline]
 dev_queue_xmit_nit+0x862/0x1280 net/core/dev.c:2317
 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
 deliver_skb net/core/dev.c:2247 [inline]
 dev_queue_xmit_nit+0x862/0x1280 net/core/dev.c:2317
 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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