=====================================
WARNING: bad unlock balance detected!
5.9.0-rc4-syzkaller #0 Not tainted
-------------------------------------
syz-executor.2/8340 is trying to release lock (
==================================================================
BUG: KASAN: use-after-free in print_lockdep_cache+0x70/0xf5 kernel/locking/lockdep.c:677
Read of size 8 at addr ffff88809827f480 by task syz-executor.2/8340

CPU: 1 PID: 8340 Comm: syz-executor.2 Not tainted 5.9.0-rc4-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+0x198/0x1fd lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 print_lockdep_cache+0x70/0xf5 kernel/locking/lockdep.c:677
 print_unlock_imbalance_bug.part.0+0x8b/0xe6 kernel/locking/lockdep.c:4471
 print_unlock_imbalance_bug kernel/locking/lockdep.c:4040 [inline]
 __lock_release kernel/locking/lockdep.c:4715 [inline]
 lock_release.cold+0x21/0x4a kernel/locking/lockdep.c:5026
 __mutex_unlock_slowpath+0x81/0x610 kernel/locking/mutex.c:1228
 ucma_destroy_id+0x21e/0x460 drivers/infiniband/core/ucma.c:629
 ucma_write+0x288/0x350 drivers/infiniband/core/ucma.c:1768
 vfs_write+0x2b0/0x730 fs/read_write.c:576
 ksys_write+0x1ee/0x250 fs/read_write.c:631
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5b9
Code: 5d b4 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f581a554c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000038340 RCX: 000000000045d5b9
RDX: 0000000000000018 RSI: 00000000200000c0 RDI: 0000000000000005
RBP: 000000000118d020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cfec
R13: 00007fff6e89cf5f R14: 00007f581a5559c0 R15: 000000000118cfec

Allocated by task 8340:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
 kmem_cache_alloc_trace+0x174/0x2c0 mm/slab.c:3550
 kmalloc include/linux/slab.h:554 [inline]
 ucma_open+0x4a/0x270 drivers/infiniband/core/ucma.c:1800
 misc_open+0x372/0x4a0 drivers/char/misc.c:141
 chrdev_open+0x266/0x770 fs/char_dev.c:414
 do_dentry_open+0x4b9/0x11b0 fs/open.c:817
 do_open fs/namei.c:3251 [inline]
 path_openat+0x1b9a/0x2730 fs/namei.c:3368
 do_filp_open+0x17e/0x3c0 fs/namei.c:3395
 do_sys_openat2+0x16d/0x420 fs/open.c:1168
 do_sys_open fs/open.c:1184 [inline]
 __do_sys_openat fs/open.c:1200 [inline]
 __se_sys_openat fs/open.c:1195 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1195
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 8333:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56
 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355
 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422
 __cache_free mm/slab.c:3418 [inline]
 kfree+0x10e/0x2b0 mm/slab.c:3756
 ucma_close+0x26d/0x310 drivers/infiniband/core/ucma.c:1856
 __fput+0x285/0x920 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:141
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:163 [inline]
 exit_to_user_mode_prepare+0x1e1/0x200 kernel/entry/common.c:190
 syscall_exit_to_user_mode+0x7e/0x2e0 kernel/entry/common.c:265
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff88809827f400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 128 bytes inside of
 512-byte region [ffff88809827f400, ffff88809827f600)
The buggy address belongs to the page:
page:00000000fda0c912 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9827f
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00025f37c8 ffffea00024ee548 ffff8880aa040600
raw: 0000000000000000 ffff88809827f000 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809827f380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809827f400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88809827f480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88809827f500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809827f580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================