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BUG: KMSAN: uninit-value in __list_add_valid+0x2a4/0x450 lib/list_debug.c:26
CPU: 0 PID: 20702 Comm: syz-executor3 Not tainted 4.17.0+ #9
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+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:1125
 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:620
 __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:2301 [inline]
 rdma_listen+0x65f/0x10f0 drivers/infiniband/core/cma.c:3327
 ucma_listen+0x4e9/0x630 drivers/infiniband/core/ucma.c:1096
 ucma_write+0x57e/0x5f0 drivers/infiniband/core/ucma.c:1676
 __vfs_write+0x1aa/0x9f0 fs/read_write.c:485
 vfs_write+0x467/0x8c0 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 fs/read_write.c:607 [inline]
 __x64_sys_write+0x1bf/0x3e0 fs/read_write.c:607
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x455b29
RSP: 002b:00007f1928edac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f1928edb6d4 RCX: 0000000000455b29
RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c25fd R14: 00000000004d3c30 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:282 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:192
 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:318
 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan.c:325
 slab_post_alloc_hook mm/slab.h:446 [inline]
 slab_alloc_node mm/slub.c:2753 [inline]
 __kmalloc_node_track_caller+0xb35/0x11b0 mm/slub.c:4395
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x2cb/0x9e0 net/core/skbuff.c:206
 alloc_skb_fclone include/linux/skbuff.h:1030 [inline]
 sk_stream_alloc_skb+0x17c/0xcf0 net/ipv4/tcp.c:875
 do_tcp_sendpages+0x15fc/0x3a00 net/ipv4/tcp.c:978
 tcp_sendpage_locked net/ipv4/tcp.c:1081 [inline]
 tcp_sendpage+0x1e0/0x240 net/ipv4/tcp.c:1091
 inet_sendpage+0x505/0x8f0 net/ipv4/af_inet.c:815
 kernel_sendpage net/socket.c:3323 [inline]
 sock_sendpage+0x1ef/0x2e0 net/socket.c:854
 pipe_to_sendpage+0x321/0x440 fs/splice.c:451
 splice_from_pipe_feed fs/splice.c:502 [inline]
 __splice_from_pipe+0x4a5/0xf50 fs/splice.c:626
 splice_from_pipe fs/splice.c:661 [inline]
 generic_splice_sendpage+0x1c6/0x2a0 fs/splice.c:832
 do_splice_from fs/splice.c:851 [inline]
 direct_splice_actor+0x19e/0x200 fs/splice.c:1018
 splice_direct_to_actor+0x767/0x1040 fs/splice.c:973
 do_splice_direct+0x335/0x540 fs/splice.c:1061
 do_sendfile+0x107b/0x1e40 fs/read_write.c:1440
 __do_sys_sendfile64 fs/read_write.c:1495 [inline]
 __se_sys_sendfile64 fs/read_write.c:1487 [inline]
 __x64_sys_sendfile64+0x218/0x390 fs/read_write.c:1487
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
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