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BUG: KMSAN: uninit-value in __list_add_valid+0x2a4/0x450 lib/list_debug.c:26
CPU: 0 PID: 26602 Comm: syz-executor0 Not tainted 4.19.0-rc8+ #70
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+0x306/0x460 lib/dump_stack.c:113
 kmsan_report+0x1a2/0x2e0 mm/kmsan/kmsan.c:917
 __msan_warning+0x7c/0xe0 mm/kmsan/kmsan_instr.c:500
 __list_add_valid+0x2a4/0x450 lib/list_debug.c:26
 __list_add include/linux/list.h:60 [inline]
 list_add_tail include/linux/list.h:93 [inline]
 cma_listen_on_all drivers/infiniband/core/cma.c:2366 [inline]
 rdma_listen+0x790/0x10b0 drivers/infiniband/core/cma.c:3383
 ucma_listen+0x32f/0x540 drivers/infiniband/core/ucma.c:1098
 ucma_write+0x5ba/0x630 drivers/infiniband/core/ucma.c:1686
 __vfs_write+0x1f4/0xb70 fs/read_write.c:485
 vfs_write+0x495/0x8e0 fs/read_write.c:549
 ksys_write fs/read_write.c:598 [inline]
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write+0x183/0x370 fs/read_write.c:607
 __x64_sys_write+0x4a/0x70 fs/read_write.c:607
 do_syscall_64+0xbe/0x100 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457569
Code: fd b3 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ff2f2cecc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000010 RSI: 0000000020003a40 RDI: 0000000000000004
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff2f2ced6d4
R13: 00000000004c53b3 R14: 00000000004d8c10 R15: 00000000ffffffff

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:255 [inline]
 kmsan_internal_poison_shadow+0xc8/0x1d0 mm/kmsan/kmsan.c:180
 kmsan_kmalloc+0xa4/0x120 mm/kmsan/kmsan_hooks.c:104
 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan_hooks.c:113
 slab_post_alloc_hook mm/slab.h:446 [inline]
 slab_alloc_node mm/slub.c:2727 [inline]
 __kmalloc_node_track_caller+0xb43/0x1400 mm/slub.c:4360
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x422/0xe90 net/core/skbuff.c:206
 alloc_skb_fclone include/linux/skbuff.h:1038 [inline]
 sk_stream_alloc_skb+0x237/0xe60 net/ipv4/tcp.c:874
 tcp_fragment+0x4f5/0x21c0 net/ipv4/tcp_output.c:1306
 __tcp_retransmit_skb+0xa0c/0x4320 net/ipv4/tcp_output.c:2847
 tcp_retransmit_skb net/ipv4/tcp_output.c:2913 [inline]
 tcp_xmit_retransmit_queue+0xef4/0x1960 net/ipv4/tcp_output.c:2995
 tcp_xmit_recovery net/ipv4/tcp_input.c:3551 [inline]
 tcp_ack+0x8d26/0x9c50 net/ipv4/tcp_input.c:3704
 tcp_rcv_established+0x1182/0x2980 net/ipv4/tcp_input.c:5631
 tcp_v4_do_rcv+0x689/0xd50 net/ipv4/tcp_ipv4.c:1534
 sk_backlog_rcv include/net/sock.h:931 [inline]
 __release_sock+0x332/0x720 net/core/sock.c:2336
 release_sock+0x99/0x2a0 net/core/sock.c:2849
 tcp_sendmsg+0xd6/0x100 net/ipv4/tcp.c:1444
 inet_sendmsg+0x4d8/0x7f0 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg net/socket.c:631 [inline]
 __sys_sendto+0x975/0xb70 net/socket.c:1788
 __do_sys_sendto net/socket.c:1800 [inline]
 __se_sys_sendto+0x107/0x130 net/socket.c:1796
 __x64_sys_sendto+0x6e/0x90 net/socket.c:1796
 do_syscall_64+0xbe/0x100 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
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