list_del corruption. prev->next should be ffff8800af1431d8, but was ffffffff8af0e970
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:53!
invalid opcode: 0000 [#1] SMP PTI
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 1562 Comm: syz-executor1 Not tainted 4.17.0+ #9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid+0x37c/0x440 lib/list_debug.c:51
RSP: 0018:ffff8801a549f498 EFLAGS: 00010286
RAX: 0000000000000054 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000
RBP: ffff8801a549f4f0 R08: 0000000001080020 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff86575950 R12: ffffffff8af0e970
R13: ffff8800af142dd8 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f1599a86700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc4ca091630 CR3: 000000014e06c000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __list_del_entry include/linux/list.h:117 [inline]
 list_del include/linux/list.h:125 [inline]
 cma_cancel_listens drivers/infiniband/core/cma.c:1553 [inline]
 cma_cancel_operation+0x69a/0xea0 drivers/infiniband/core/cma.c:1581
 rdma_destroy_id+0x1a1/0x1800 drivers/infiniband/core/cma.c:1645
 ucma_close+0x29a/0x450 drivers/infiniband/core/ucma.c:1755
 __fput+0x458/0xa30 fs/file_table.c:209
 ____fput+0x37/0x40 fs/file_table.c:243
 task_work_run+0x22e/0x2b0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x110e/0x3930 kernel/exit.c:867
 do_group_exit+0x1a0/0x360 kernel/exit.c:970
 get_signal+0x1405/0x1ec0 kernel/signal.c:2482
 do_signal+0xb8/0x1d20 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline]
 prepare_exit_to_usermode+0x271/0x3a0 arch/x86/entry/common.c:196
 syscall_return_slowpath+0xe9/0x710 arch/x86/entry/common.c:265
 do_syscall_64+0x1ad/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x455a99
RSP: 002b:00007f1599a85ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000072bf68 RCX: 0000000000455a99
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bf68
RBP: 000000000072bf68 R08: 0000000000000000 R09: 000000000072bf48
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000a3e81f R14: 00007f1599a869c0 R15: 0000000000000001
Code: 00 48 c7 81 80 0c 00 00 00 00 00 00 c7 81 20 03 00 00 00 00 00 00 48 c7 c7 3e b2 9c 8a 31 c0 48 8b 75 c0 4c 89 e2 e8 c4 9f 3e fd <0f> 0b 66 90 eb fe 44 89 f7 e8 66 98 be fd e9 88 fd ff ff 48 85 
RIP: __list_del_entry_valid+0x37c/0x440 lib/list_debug.c:51 RSP: ffff8801a549f498
---[ end trace 26786f74ad33aa53 ]---