RBP: 00007efc18f4d1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff8087c88f R14: 00007efc18f4d300 R15: 0000000000022000
==================================================================
BUG: KASAN: use-after-free in __list_del_entry_valid+0xe0/0xf0 lib/list_debug.c:51
Read of size 8 at addr ffff88808ff20698 by task syz-executor.4/25644

CPU: 1 PID: 25644 Comm: syz-executor.4 Not tainted 4.14.260-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430
 __list_del_entry_valid+0xe0/0xf0 lib/list_debug.c:51
 __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:1607 [inline]
 cma_cancel_operation drivers/infiniband/core/cma.c:1635 [inline]
 cma_cancel_operation+0x285/0x950 drivers/infiniband/core/cma.c:1623
 rdma_destroy_id+0x84/0xb60 drivers/infiniband/core/cma.c:1699
 ucma_close+0x11a/0x340 drivers/infiniband/core/ucma.c:1753
 __fput+0x25f/0x7a0 fs/file_table.c:210
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f79df04dadb
RSP: 002b:00007ffe8d61ee30 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007f79df04dadb
RDX: 0000000000000000 RSI: 0000001b2ff216d8 RDI: 0000000000000004
RBP: 00007f79df1af960 R08: 0000000000000000 R09: 000000005290041d
R10: 0000000000000000 R11: 0000000000000293 R12: 00000000001237ee
R13: 00007ffe8d61ef30 R14: 00007f79df1ae100 R15: 0000000000000032

Allocated by task 25640:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618
 kmalloc include/linux/slab.h:488 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 rdma_create_id+0x57/0x4c0 drivers/infiniband/core/cma.c:790
 ucma_create_id+0x18b/0x500 drivers/infiniband/core/ucma.c:484
 ucma_write+0x206/0x2c0 drivers/infiniband/core/ucma.c:1672
 __vfs_write+0xe4/0x630 fs/read_write.c:480
 vfs_write+0x17f/0x4d0 fs/read_write.c:544
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0xf2/0x210 fs/read_write.c:582
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 25630:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xc9/0x250 mm/slab.c:3815
 ucma_close+0x11a/0x340 drivers/infiniband/core/ucma.c:1753
 __fput+0x25f/0x7a0 fs/file_table.c:210
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

The buggy address belongs to the object at ffff88808ff204c0
 which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 472 bytes inside of
 1024-byte region [ffff88808ff204c0, ffff88808ff208c0)
The buggy address belongs to the page:
page:ffffea00023fc800 count:1 mapcount:0 mapping:ffff88808ff20040 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffff88808ff20040 0000000000000000 0000000100000007
raw: ffffea0002caaea0 ffffea00024f0da0 ffff88813fe74ac0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808ff20580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88808ff20600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88808ff20680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff88808ff20700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88808ff20780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================