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BUG: KASAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:938 [inline]
BUG: KASAN: use-after-free in __mutex_lock+0x108f/0x1410 kernel/locking/mutex.c:1103
Read of size 8 at addr ffff88809a9dd388 by task kworker/u4:8/751

CPU: 0 PID: 751 Comm: kworker/u4:8 Not tainted 5.5.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: ib_addr process_one_req
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x12d/0x187 lib/dump_stack.c:118
 print_address_description.constprop.8.cold.10+0x9/0x31d mm/kasan/report.c:374
 __kasan_report.cold.11+0x1b/0x3a mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:639
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
 __mutex_lock_common kernel/locking/mutex.c:938 [inline]
 __mutex_lock+0x108f/0x1410 kernel/locking/mutex.c:1103
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
 addr_handler+0xac/0x300 drivers/infiniband/core/cma.c:3059
 process_one_req+0xdf/0x610 drivers/infiniband/core/addr.c:643
 process_one_work+0x891/0x1690 kernel/workqueue.c:2264
 worker_thread+0x85/0xb60 kernel/workqueue.c:2410
 kthread+0x334/0x3f0 kernel/kthread.c:255
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

Allocated by task 5586:
 save_stack+0x21/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc.constprop.9+0xc7/0xd0 mm/kasan/common.c:513
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527
 kmem_cache_alloc_trace+0x15b/0x780 mm/slab.c:3551
 kmalloc include/linux/slab.h:556 [inline]
 kzalloc include/linux/slab.h:670 [inline]
 __rdma_create_id+0x5d/0x510 drivers/infiniband/core/cma.c:855
 ucma_create_id+0x199/0x550 drivers/infiniband/core/ucma.c:501
 ucma_write+0x206/0x2e0 drivers/infiniband/core/ucma.c:1684
 __vfs_write+0x61/0x110 fs/read_write.c:494
 vfs_write+0x18a/0x520 fs/read_write.c:558
 ksys_write+0x197/0x220 fs/read_write.c:611
 __do_sys_write fs/read_write.c:623 [inline]
 __se_sys_write fs/read_write.c:620 [inline]
 __x64_sys_write+0x6e/0xb0 fs/read_write.c:620
 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 5568:
 save_stack+0x21/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 kasan_set_free_info mm/kasan/common.c:335 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x108/0x2c0 mm/slab.c:3757
 rdma_destroy_id+0x612/0xa00 drivers/infiniband/core/cma.c:1850
 ucma_close+0x101/0x2d0 drivers/infiniband/core/ucma.c:1762
 __fput+0x25d/0x780 fs/file_table.c:280
 ____fput+0x9/0x10 fs/file_table.c:313
 task_work_run+0x10e/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x1be/0x210 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x50b/0x600 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88809a9dd000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 904 bytes inside of
 2048-byte region [ffff88809a9dd000, ffff88809a9dd800)
The buggy address belongs to the page:
page:ffffea00026a7740 refcount:1 mapcount:0 mapping:ffff8880aa800e00 index:0x0
raw: 01fffc0000000200 ffffea0002514708 ffffea0002901c08 ffff8880aa800e00
raw: 0000000000000000 ffff88809a9dd000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809a9dd280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809a9dd300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88809a9dd380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff88809a9dd400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809a9dd480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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