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BUG: KMSAN: uninit-value in slab_alloc_node mm/slub.c:2704 [inline]
BUG: KMSAN: uninit-value in __kmalloc_node_track_caller+0x667/0x1160 mm/slub.c:4352
CPU: 1 PID: 10120 Comm: syz-executor3 Not tainted 4.19.0-rc1+ #43
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+0x14b/0x190 lib/dump_stack.c:113
 kmsan_report+0x183/0x2b0 mm/kmsan/kmsan.c:956
 __msan_warning+0x70/0xc0 mm/kmsan/kmsan_instr.c:645
 slab_alloc_node mm/slub.c:2704 [inline]
 __kmalloc_node_track_caller+0x667/0x1160 mm/slub.c:4352
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x2f5/0x9e0 net/core/skbuff.c:206
 alloc_skb include/linux/skbuff.h:996 [inline]
 __tcp_send_ack+0x10d/0x880 net/ipv4/tcp_output.c:3584
 tcp_send_ack+0x68/0x90 net/ipv4/tcp_output.c:3611
 __tcp_ack_snd_check+0x786/0x8e0 net/ipv4/tcp_input.c:5186
 tcp_ack_snd_check net/ipv4/tcp_input.c:5222 [inline]
 tcp_rcv_established+0x1b4e/0x2860 net/ipv4/tcp_input.c:5643
 tcp_v4_do_rcv+0x689/0xd50 net/ipv4/tcp_ipv4.c:1532
 sk_backlog_rcv include/net/sock.h:931 [inline]
 __release_sock+0x2ae/0x660 net/core/sock.c:2336
 release_sock+0x99/0x2a0 net/core/sock.c:2849
 tcp_recvmsg+0x351f/0x4280 net/ipv4/tcp.c:2152
 inet_recvmsg+0x4d0/0x5e0 net/ipv4/af_inet.c:830
 sock_recvmsg_nosec net/socket.c:794 [inline]
 sock_recvmsg net/socket.c:801 [inline]
 __sys_recvfrom+0x61e/0x7f0 net/socket.c:1843
 __do_sys_recvfrom net/socket.c:1861 [inline]
 __se_sys_recvfrom+0x111/0x130 net/socket.c:1857
 __x64_sys_recvfrom+0x6e/0x90 net/socket.c:1857
 do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x4572a9
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f2f131ebc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
RAX: ffffffffffffffda RBX: 00007f2f131ec6d4 RCX: 00000000004572a9
RDX: 6478c8501c739e53 RSI: 0000000020f9cf9b RDI: 0000000000000003
RBP: 0000000000930140 R08: 0000000000000000 R09: 000000000000004f
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d4498 R14: 00000000004c8ce4 R15: 0000000000000001

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:181
 kmsan_kmalloc+0x98/0x100 mm/kmsan/kmsan_hooks.c:91
 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan_hooks.c:100
 slab_post_alloc_hook mm/slab.h:446 [inline]
 slab_alloc_node mm/slub.c:2719 [inline]
 __kmalloc_node_track_caller+0x9e7/0x1160 mm/slub.c:4352
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x2f5/0x9e0 net/core/skbuff.c:206
 alloc_skb_fclone include/linux/skbuff.h:1038 [inline]
 sk_stream_alloc_skb+0x172/0xc90 net/ipv4/tcp.c:874
 tso_fragment net/ipv4/tcp_output.c:1860 [inline]
 tcp_write_xmit+0x2677/0xa5a0 net/ipv4/tcp_output.c:2354
 tcp_tsq_write+0x3ec/0x440 net/ipv4/tcp_output.c:801
 tcp_tsq_handler net/ipv4/tcp_output.c:810 [inline]
 tcp_pace_kick+0x115/0x270 net/ipv4/tcp_output.c:974
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0xbfc/0x15b0 kernel/time/hrtimer.c:1460
 hrtimer_run_softirq+0x1b3/0x2b0 kernel/time/hrtimer.c:1474
 __do_softirq+0x562/0x948 kernel/softirq.c:292
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