=====================================
WARNING: bad unlock balance detected!
5.6.0-syzkaller #0 Not tainted
-------------------------------------
syz-executor.4/6723 is trying to release lock (
==================================================================
BUG: KASAN: use-after-free in print_unlock_imbalance_bug.cold.53+0x97/0x123 kernel/locking/lockdep.c:3999
Read of size 8 at addr ffff8880a816a660 by task syz-executor.4/6723

CPU: 1 PID: 6723 Comm: syz-executor.4 Not tainted 5.6.0-syzkaller #0
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+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/0x32 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:641
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
 print_unlock_imbalance_bug.cold.53+0x97/0x123 kernel/locking/lockdep.c:3999
 __lock_release kernel/locking/lockdep.c:4241 [inline]
 lock_release+0x60e/0x910 kernel/locking/lockdep.c:4502
 __mutex_unlock_slowpath+0x86/0x690 kernel/locking/mutex.c:1228
 mutex_unlock+0xd/0x10 kernel/locking/mutex.c:740
 ucma_destroy_id+0x23e/0x400 drivers/infiniband/core/ucma.c:621
 ucma_write+0x203/0x2d0 drivers/infiniband/core/ucma.c:1684
 __vfs_write+0x5e/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+0xca/0x630 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c449
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f7b37ecbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f7b37ecc6d4 RCX: 000000000045c449
RDX: 0000000000000018 RSI: 0000000020000200 RDI: 0000000000000006
RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000cb7 R14: 00000000004d7b10 R15: 000000000076bf2c

Allocated by task 6735:
 save_stack+0x21/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc.constprop.17+0xc7/0xd0 mm/kasan/common.c:515
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:529
 kmem_cache_alloc_trace+0x15b/0x780 mm/slab.c:3551
 kmalloc include/linux/slab.h:555 [inline]
 ucma_open+0x4d/0x250 drivers/infiniband/core/ucma.c:1716
 misc_open+0x31b/0x4d0 drivers/char/misc.c:141
 chrdev_open+0x1ed/0x5c0 fs/char_dev.c:414
 do_dentry_open+0x3fa/0x1100 fs/open.c:797
 vfs_open+0x9a/0xc0 fs/open.c:911
 do_last fs/namei.c:3490 [inline]
 path_openat+0x8fb/0x2d40 fs/namei.c:3607
 do_filp_open+0x171/0x240 fs/namei.c:3637
 do_sys_openat2+0x2e0/0x510 fs/open.c:1146
 do_sys_open+0x90/0xe0 fs/open.c:1162
 __do_sys_openat fs/open.c:1176 [inline]
 __se_sys_openat fs/open.c:1171 [inline]
 __x64_sys_openat+0x98/0xf0 fs/open.c:1171
 do_syscall_64+0xca/0x630 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 6722:
 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:337 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:476
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:485
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x108/0x2c0 mm/slab.c:3757
 ucma_close+0x22b/0x2d0 drivers/infiniband/core/ucma.c:1772
 __fput+0x25a/0x770 fs/file_table.c:280
 ____fput+0x9/0x10 fs/file_table.c:313
 task_work_run+0x108/0x180 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x24e/0x2e0 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+0x531/0x630 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a816a600
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 96 bytes inside of
 256-byte region [ffff8880a816a600, ffff8880a816a700)
The buggy address belongs to the page:
page:ffffea0002a05a80 refcount:1 mapcount:0 mapping:ffff8880aa4008c0 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00029ebac8 ffffea00029b8988 ffff8880aa4008c0
raw: 0000000000000000 ffff8880a816a000 0000000100000008 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a816a500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a816a580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880a816a600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff8880a816a680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a816a700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================