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BUG: KMSAN: uninit-value in variable_test_bit arch/x86/include/asm/bitops.h:214 [inline]
BUG: KMSAN: uninit-value in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:111 [inline]
BUG: KMSAN: uninit-value in macvlan_broadcast+0x3de/0xac0 drivers/net/macvlan.c:278
CPU: 0 PID: 12030 Comm: syz-executor494 Not tainted 5.5.0-rc1-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+0x1c9/0x220 lib/dump_stack.c:118
 kmsan_report+0xf8/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 variable_test_bit arch/x86/include/asm/bitops.h:214 [inline]
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:111 [inline]
 macvlan_broadcast+0x3de/0xac0 drivers/net/macvlan.c:278
 macvlan_queue_xmit drivers/net/macvlan.c:520 [inline]
 macvlan_start_xmit+0x456/0xad0 drivers/net/macvlan.c:559
 __netdev_start_xmit include/linux/netdevice.h:4447 [inline]
 netdev_start_xmit include/linux/netdevice.h:4461 [inline]
 dev_direct_xmit+0x85c/0xb50 net/core/dev.c:4079
 packet_direct_xmit+0x289/0x470 net/packet/af_packet.c:240
 packet_snd net/packet/af_packet.c:2965 [inline]
 packet_sendmsg+0x836f/0x92a0 net/packet/af_packet.c:2990
 sock_sendmsg_nosec net/socket.c:639 [inline]
 sock_sendmsg net/socket.c:659 [inline]
 __sys_sendto+0xc44/0xc70 net/socket.c:1985
 __do_sys_sendto net/socket.c:1997 [inline]
 __se_sys_sendto+0x107/0x130 net/socket.c:1993
 __x64_sys_sendto+0x6e/0x90 net/socket.c:1993
 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x442f29
Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 6b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffcfa435ec8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000442f29
RDX: 000000000000000e RSI: 0000000020000080 RDI: 0000000000000003
RBP: 0000000000020902 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000403db0 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:127
 kmsan_slab_alloc+0x8b/0xe0 mm/kmsan/kmsan_hooks.c:82
 slab_alloc_node mm/slub.c:2774 [inline]
 __kmalloc_node_track_caller+0xe47/0x11f0 mm/slub.c:4382
 __kmalloc_reserve net/core/skbuff.c:141 [inline]
 __alloc_skb+0x309/0xa50 net/core/skbuff.c:209
 alloc_skb include/linux/skbuff.h:1049 [inline]
 alloc_skb_with_frags+0x18c/0xa80 net/core/skbuff.c:5664
 sock_alloc_send_pskb+0xae9/0xc70 net/core/sock.c:2242
 sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2259
 mld_newpack+0x2ad/0xd30 net/ipv6/mcast.c:1609
 add_grhead net/ipv6/mcast.c:1713 [inline]
 add_grec+0x1cdf/0x2120 net/ipv6/mcast.c:1844
 mld_send_initial_cr+0x371/0x4d0 net/ipv6/mcast.c:2094
 ipv6_mc_dad_complete+0xae/0x600 net/ipv6/mcast.c:2106
 addrconf_dad_completed+0x8c3/0x1580 net/ipv6/addrconf.c:4176
 addrconf_dad_work+0x1b6c/0x2ac0 net/ipv6/addrconf.c:4107
 process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2264
 worker_thread+0x111b/0x2460 kernel/workqueue.c:2410
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:353
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