list_add corruption. prev->next should be next (ffffffff887af9e0), but was           (null). (prev=ffff88808e811cd8).
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:26!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 15658 Comm: syz-executor.5 Not tainted 4.14.170-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880933f6600 task.stack: ffff8880594f0000
RIP: 0010:__list_add_valid.cold+0x3a/0x3c lib/list_debug.c:26
RSP: 0018:ffff8880594f7b80 EFLAGS: 00010286
RAX: 0000000000000075 RBX: ffff88808e811cd8 RCX: 0000000000000000
RDX: 000000000000fbfe RSI: ffffffff814b5755 RDI: ffffed100b29ef66
RBP: ffff8880594f7b98 R08: 0000000000000075 R09: ffff8880933f6ea0
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff887af9e0
R13: ffff88809fbd3418 R14: 0000000000000400 R15: 0000000000000000
FS:  00007ffb58c3d700(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32729000 CR3: 0000000088bdb000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __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:2321 [inline]
 rdma_listen+0x5a7/0x840 drivers/infiniband/core/cma.c:3319
 ucma_listen+0x10e/0x170 drivers/infiniband/core/ucma.c:1078
 ucma_write+0x231/0x310 drivers/infiniband/core/ucma.c:1672
 __vfs_write+0x105/0x6b0 fs/read_write.c:480
 vfs_write+0x198/0x500 fs/read_write.c:544
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0xfd/0x230 fs/read_write.c:582
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45b3b9
RSP: 002b:00007ffb58c3cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffb58c3d6d4 RCX: 000000000045b3b9
RDX: 0000000000000010 RSI: 00000000200001c0 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000c8b R14: 00000000004cd6b1 R15: 000000000075bf2c
Code: 0f 0b 48 89 f2 4c 89 e1 4c 89 ee 48 c7 c7 40 55 04 87 e8 b8 e7 3c fe 0f 0b 48 89 f1 48 c7 c7 c0 54 04 87 4c 89 e6 e8 a4 e7 3c fe <0f> 0b 4c 89 f6 48 c7 c7 60 56 04 87 e8 93 e7 3c fe 0f 0b 4c 89 
RIP: __list_add_valid.cold+0x3a/0x3c lib/list_debug.c:26 RSP: ffff8880594f7b80
---[ end trace 5c5995b3b7369a9b ]---