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BUG: KMSAN: uninit-value in geneve_xmit_skb drivers/net/geneve.c:909 [inline]
BUG: KMSAN: uninit-value in geneve_xmit+0x300c/0x3200 drivers/net/geneve.c:1005
CPU: 0 PID: 4874 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+0x21c/0x280 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
 geneve_xmit_skb drivers/net/geneve.c:909 [inline]
 geneve_xmit+0x300c/0x3200 drivers/net/geneve.c:1005
 __netdev_start_xmit include/linux/netdevice.h:4611 [inline]
 netdev_start_xmit include/linux/netdevice.h:4625 [inline]
 xmit_one+0x3cf/0x750 net/core/dev.c:3556
 dev_hard_start_xmit net/core/dev.c:3572 [inline]
 __dev_queue_xmit+0x3aad/0x4470 net/core/dev.c:4131
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4164
 neigh_hh_output include/net/neighbour.h:498 [inline]
 neigh_output include/net/neighbour.h:507 [inline]
 ip6_finish_output2+0x23f1/0x2a70 net/ipv6/ip6_output.c:117
 __ip6_finish_output+0x9c0/0xa90 net/ipv6/ip6_output.c:143
 ip6_finish_output+0x14b/0x4b0 net/ipv6/ip6_output.c:153
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip6_output+0x68d/0x7f0 net/ipv6/ip6_output.c:176
 dst_output include/net/dst.h:443 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 mld_sendpack+0xf6c/0x1470 net/ipv6/mcast.c:1679
 mld_send_cr net/ipv6/mcast.c:1975 [inline]
 mld_ifc_timer_expire+0x13b8/0x1b50 net/ipv6/mcast.c:2474
 call_timer_fn+0x226/0x550 kernel/time/timer.c:1404
 expire_timers+0x4fc/0x780 kernel/time/timer.c:1449
 __run_timers+0xaf4/0xd30 kernel/time/timer.c:1773
 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786
 __do_softirq+0x2ea/0x7f5 kernel/softirq.c:293
 asm_call_on_stack+0xf/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+0x173/0x180 mm/kmsan/kmsan_shadow.c:203
Code: e8 04 48 b9 00 d0 cc cc cc cc cc cc 48 0f af c8 48 09 d9 48 b8 00 00 00 00 80 88 ff ff e9 fd fe ff ff 31 c0 5b 41 5e 41 5f 5d <c3> 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 48 89 f8 48 2d
RSP: 0018:ffff888115a4f6d0 EFLAGS: 00000282
RAX: ffff88811524faf8 RBX: 0000000000000000 RCX: 000000011524faf8
RDX: 0000000115a4faf8 RSI: 0000000000000440 RDI: ffff888115a4faf8
RBP: ffff888115a4f6f0 R08: ffffea000000000f R09: ffff88812fffa000
R10: 0000000000000004 R11: ffff88811a0dbd00 R12: ffff888115a1b160
R13: ffff8881231f0900 R14: ffff888115a4faf8 R15: 0000000000000000
 __msan_metadata_ptr_for_load_8+0x10/0x20 mm/kmsan/kmsan_instr.c:55
 handle_mounts fs/namei.c:1367 [inline]
 step_into+0xed/0x33f0 fs/namei.c:1690
 walk_component+0x8c6/0xbb0 fs/namei.c:1866
 link_path_walk+0xbef/0x1460 fs/namei.c:2179
 path_lookupat+0x17c/0x1100 fs/namei.c:2332
 filename_lookup+0x313/0xc40 fs/namei.c:2366
 user_path_at_empty+0x123/0x140 fs/namei.c:2646
 user_path_at include/linux/namei.h:59 [inline]
 vfs_statx+0x2a0/0x940 fs/stat.c:202
 vfs_lstat include/linux/fs.h:3302 [inline]
 __do_sys_newlstat fs/stat.c:374 [inline]
 __se_sys_newlstat+0xce/0x920 fs/stat.c:368
 __x64_sys_newlstat+0x3e/0x60 fs/stat.c:368
 do_syscall_64+0xad/0x160 arch/x86/entry/common.c:386
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f4ff9f5b335
Code: Bad RIP value.
RSP: 002b:00007ffd0bfe4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000006
RAX: ffffffffffffffda RBX: 000055e2b9f244f0 RCX: 00007f4ff9f5b335
RDX: 00007ffd0bfe4cb0 RSI: 00007ffd0bfe4cb0 RDI: 000055e2b9f234f0
RBP: 00007ffd0bfe4d70 R08: 00007f4ffa21a1a8 R09: 0000000000001010
R10: 0000000000000020 R11: 0000000000000246 R12: 000055e2b9f234f0
R13: 000055e2b9f2350a R14: 000055e2b9f175e5 R15: 000055e2b9f175ea

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
 geneve_changelink+0xdb2/0x10f0 drivers/net/geneve.c:1652
 __rtnl_newlink net/core/rtnetlink.c:3255 [inline]
 rtnl_newlink+0x3384/0x3ed0 net/core/rtnetlink.c:3397
 rtnetlink_rcv_msg+0x142b/0x18c0 net/core/rtnetlink.c:5460
 netlink_rcv_skb+0x6d7/0x7e0 net/netlink/af_netlink.c:2469
 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:5478
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x11c8/0x1490 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x173a/0x1840 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 kernel_sendmsg+0x22c/0x2f0 net/socket.c:692
 sock_no_sendpage+0x205/0x2b0 net/core/sock.c:2853
 kernel_sendpage net/socket.c:3642 [inline]
 sock_sendpage+0x1dc/0x2b0 net/socket.c:945
 pipe_to_sendpage+0x3f4/0x530 fs/splice.c:448
 splice_from_pipe_feed fs/splice.c:502 [inline]
 __splice_from_pipe+0x5e3/0xff0 fs/splice.c:626
 splice_from_pipe fs/splice.c:661 [inline]
 generic_splice_sendpage+0x1d5/0x2d0 fs/splice.c:834
 do_splice_from fs/splice.c:846 [inline]
 do_splice+0x2727/0x39e0 fs/splice.c:1144
 __do_sys_splice fs/splice.c:1419 [inline]
 __se_sys_splice+0x323/0x500 fs/splice.c:1401
 __x64_sys_splice+0x6e/0x90 fs/splice.c:1401
 do_syscall_64+0xad/0x160 arch/x86/entry/common.c:386
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Local variable ----df@geneve_changelink created at:
 geneve_changelink+0x101/0x10f0 drivers/net/geneve.c:1622
 geneve_changelink+0x101/0x10f0 drivers/net/geneve.c:1622
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