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BUG: KMSAN: uninit-value in __skb_flow_dissect+0x5153/0x8070 net/core/flow_dissector.c:1418
CPU: 1 PID: 10866 Comm: kworker/u4:0 Not tainted 5.6.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x220 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 __skb_flow_dissect+0x5153/0x8070 net/core/flow_dissector.c:1418
 skb_flow_dissect include/linux/skbuff.h:1295 [inline]
 fl_classify+0x3f5/0x1310 net/sched/cls_flower.c:319
 tcf_classify+0x280/0x700 net/sched/cls_api.c:1581
 hfsc_classify net/sched/sch_hfsc.c:1132 [inline]
 hfsc_enqueue+0x536/0x1700 net/sched/sch_hfsc.c:1539
 __dev_xmit_skb net/core/dev.c:3721 [inline]
 __dev_queue_xmit+0x20b3/0x4220 net/core/dev.c:4032
 dev_queue_xmit_accel+0x67/0x80 net/core/dev.c:4102
 macvlan_queue_xmit drivers/net/macvlan.c:535 [inline]
 macvlan_start_xmit+0x587/0xb50 drivers/net/macvlan.c:560
 __netdev_start_xmit include/linux/netdevice.h:4524 [inline]
 netdev_start_xmit include/linux/netdevice.h:4538 [inline]
 xmit_one net/core/dev.c:3470 [inline]
 dev_hard_start_xmit+0x531/0xab0 net/core/dev.c:3486
 sch_direct_xmit+0x512/0x18b0 net/sched/sch_generic.c:314
 __dev_xmit_skb net/core/dev.c:3671 [inline]
 __dev_queue_xmit+0x1fc3/0x4220 net/core/dev.c:4032
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4096
 neigh_resolve_output+0xab0/0xb40 net/core/neighbour.c:1487
 neigh_output include/net/neighbour.h:510 [inline]
 ip_finish_output2+0x1acc/0x2610 net/ipv4/ip_output.c:228
 __ip_finish_output+0xaa7/0xd80 net/ipv4/ip_output.c:306
 ip_finish_output+0x166/0x410 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip_output+0x593/0x680 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:436 [inline]
 ip_local_out+0x164/0x1d0 net/ipv4/ip_output.c:125
 igmpv3_sendpack net/ipv4/igmp.c:426 [inline]
 igmpv3_send_cr net/ipv4/igmp.c:721 [inline]
 igmp_ifc_timer_expire+0x1467/0x1cd0 net/ipv4/igmp.c:809
 call_timer_fn+0x218/0x510 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers+0xcff/0x1210 kernel/time/timer.c:1773
 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786
 __do_softirq+0x311/0x83d kernel/softirq.c:293
 invoke_softirq kernel/softirq.c:375 [inline]
 irq_exit+0x230/0x280 kernel/softirq.c:416
 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:546
 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1149
 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:834
 </IRQ>
RIP: 0010:kmsan_get_shadow_origin_ptr+0x6/0xb0 mm/kmsan/kmsan_shadow.c:142
Code: e0 0d 00 75 10 48 8b 45 b8 c6 80 c8 09 00 00 01 e9 62 fe ff ff 48 c7 c7 8a 9a 86 ab 31 c0 e8 83 58 48 ff cc 55 48 89 e5 41 57 <41> 56 53 41 89 d7 48 89 f1 49 89 fe 48 81 fe 01 10 00 00 73 6b 80
RSP: 0018:ffff8ee6c1577a48 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffffffaa802541 RBX: 0000000000000002 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff89f7d74c2010
RBP: ffff8ee6c1577a50 R08: ffffbcf28000000f R09: ffff89f72fffb000
R10: 0000000000000000 R11: ffffffffaa8017c0 R12: 0000000000000000
R13: ffff89f7d74c2000 R14: ffff89f7d74c2010 R15: ffff89f7d74c2000
 __msan_metadata_ptr_for_load_1+0x10/0x20 mm/kmsan/kmsan_instr.c:52
 batadv_iv_ogm_schedule+0x4d/0x13c0 net/batman-adv/bat_iv_ogm.c:860
 batadv_iv_send_outstanding_bat_ogm_packet+0xbae/0xd50 net/batman-adv/bat_iv_ogm.c:1718
 process_one_work+0x1555/0x1f40 kernel/workqueue.c:2264
 worker_thread+0xef6/0x2450 kernel/workqueue.c:2410
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:353

Local variable ----skb_key@fl_classify created at:
 fl_classify+0xd4/0x1310 net/sched/cls_flower.c:303
 fl_classify+0xd4/0x1310 net/sched/cls_flower.c:303
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