There is no matching lock for this mutex. Git history suggests this is
just a missed remnant from an earlier version of the function before
this locking was moved into uverbs_free_xrcd.
Originally this lock was protecting the xrcd_table_delete()
=====================================
WARNING: bad unlock balance detected!
4.15.0+ #87 Not tainted
-------------------------------------
syzkaller223405/269 is trying to release lock (&uverbs_dev->xrcd_tree_mutex) at:
[<00000000b8703372>] ib_uverbs_close_xrcd+0x195/0x1f0
but there are no more locks to release!
other info that might help us debug this:
1 lock held by syzkaller223405/269:
#0: (&uverbs_dev->disassociate_srcu){....}, at: [<000000005af3b960>] ib_uverbs_write+0x265/0xef0
stack backtrace:
CPU: 0 PID: 269 Comm: syzkaller223405 Not tainted 4.15.0+ #87
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014
Call Trace:
dump_stack+0xde/0x164
? dma_virt_map_sg+0x22c/0x22c
? ib_uverbs_write+0x265/0xef0
? console_unlock+0x502/0xbd0
? ib_uverbs_close_xrcd+0x195/0x1f0
print_unlock_imbalance_bug+0x131/0x160
lock_release+0x59d/0x1100
? ib_uverbs_close_xrcd+0x195/0x1f0
? lock_acquire+0x440/0x440
? lock_acquire+0x440/0x440
__mutex_unlock_slowpath+0x88/0x670
? wait_for_completion+0x4c0/0x4c0
? rdma_lookup_get_uobject+0x145/0x2f0
ib_uverbs_close_xrcd+0x195/0x1f0
? ib_uverbs_open_xrcd+0xdd0/0xdd0
ib_uverbs_write+0x7f9/0xef0
? cyc2ns_read_end+0x10/0x10
? ib_uverbs_open_xrcd+0xdd0/0xdd0
? uverbs_devnode+0x110/0x110
? cyc2ns_read_end+0x10/0x10
? cyc2ns_read_end+0x10/0x10
? sched_clock_cpu+0x18/0x200
__vfs_write+0x10d/0x700
? uverbs_devnode+0x110/0x110
? kernel_read+0x170/0x170
? __fget+0x358/0x5d0
? security_file_permission+0x93/0x260
vfs_write+0x1b0/0x550
SyS_write+0xc7/0x1a0
? SyS_read+0x1a0/0x1a0
? trace_hardirqs_on_thunk+0x1a/0x1c
entry_SYSCALL_64_fastpath+0x1e/0x8b
RIP: 0033:0x4335c9
Cc: syzkaller <syzkaller@googlegroups.com>
Cc: <stable@vger.kernel.org> # 4.11
Fixes: fd3c7904db ("IB/core: Change idr objects to use the new schema")
Reported-by: Noa Osherovich <noaos@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5c2e1c4f92