==================================================================
BUG: KMSAN: uninit-value in __list_add_valid+0x292/0x430 lib/list_debug.c:26
CPU: 0 PID: 11541 Comm: syz-executor3 Not tainted 5.0.0-rc1+ #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+0x173/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:600
 __msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:313
 __list_add_valid+0x292/0x430 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:2474 [inline]
 rdma_listen+0x64a/0xfe0 drivers/infiniband/core/cma.c:3489
 ucma_listen+0x4fa/0x630 drivers/infiniband/core/ucma.c:1100
 ucma_write+0x5c7/0x640 drivers/infiniband/core/ucma.c:1689
 __vfs_write+0x1e2/0xc20 fs/read_write.c:485
 vfs_write+0x481/0x920 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+0x17a/0x370 fs/read_write.c:607
 __x64_sys_write+0x4a/0x70 fs/read_write.c:607
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x458089
Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f5f2b74bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458089
RDX: 0000000000000010 RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5f2b74c6d4
R13: 00000000004c7262 R14: 00000000004dcb80 R15: 00000000ffffffff

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline]
 kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:159
 kmsan_kmalloc+0xa6/0x130 mm/kmsan/kmsan_hooks.c:176
 kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:185
 slab_post_alloc_hook mm/slab.h:446 [inline]
 slab_alloc_node mm/slub.c:2754 [inline]
 __kmalloc_node_track_caller+0xe9e/0xff0 mm/slub.c:4377
 __kmalloc_reserve net/core/skbuff.c:140 [inline]
 __alloc_skb+0x309/0xa20 net/core/skbuff.c:208
 alloc_skb include/linux/skbuff.h:1012 [inline]
 nlmsg_new include/net/netlink.h:654 [inline]
 inet6_rt_notify+0x2cf/0x630 net/ipv6/route.c:4976
 fib6_add_rt2node net/ipv6/ip6_fib.c:1120 [inline]
 fib6_add+0x3208/0x5250 net/ipv6/ip6_fib.c:1337
 __ip6_ins_rt net/ipv6/route.c:1157 [inline]
 ip6_ins_rt+0x140/0x1d0 net/ipv6/route.c:1167
 __ipv6_ifa_notify+0x971/0x19a0 net/ipv6/addrconf.c:5876
 ipv6_ifa_notify net/ipv6/addrconf.c:5910 [inline]
 addrconf_dad_completed+0x1e3/0x1470 net/ipv6/addrconf.c:4119
 addrconf_dad_work+0x17c7/0x26e0 net/ipv6/addrconf.c:4068
 process_one_work+0x1607/0x1f80 kernel/workqueue.c:2153
 worker_thread+0x111c/0x2460 kernel/workqueue.c:2296
 kthread+0x4a1/0x4e0 kernel/kthread.c:247
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355
==================================================================