===================================== WARNING: bad unlock balance detected! 4.17.0-rc5+ #59 Not tainted ------------------------------------- kworker/u4:1/22 is trying to release lock (&file->mut) at: [] ucma_event_handler+0x780/0xff0 drivers/infiniband/core/ucma.c:390 but there are no more locks to release! other info that might help us debug this: 4 locks held by kworker/u4:1/22: #0: (ptrval) ((wq_completion)"ib_addr"){+.+.}, at: __write_once_size include/linux/compiler.h:215 [inline] #0: (ptrval) ((wq_completion)"ib_addr"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: (ptrval) ((wq_completion)"ib_addr"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: (ptrval) ((wq_completion)"ib_addr"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:57 [inline] #0: (ptrval) ((wq_completion)"ib_addr"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: (ptrval) ((wq_completion)"ib_addr"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: (ptrval) ((wq_completion)"ib_addr"){+.+.}, at: process_one_work+0xaef/0x1b50 kernel/workqueue.c:2116 #1: (ptrval) ((work_completion)(&(&req->work)->work)){+.+.}, at: process_one_work+0xb46/0x1b50 kernel/workqueue.c:2120 #2: (ptrval) (&id_priv->handler_mutex){+.+.}, at: addr_handler+0xa6/0x3d0 drivers/infiniband/core/cma.c:2796 #3: (ptrval) (&file->mut){+.+.}, at: ucma_event_handler+0x10e/0xff0 drivers/infiniband/core/ucma.c:350 stack backtrace: CPU: 1 PID: 22 Comm: kworker/u4:1 Not tainted 4.17.0-rc5+ #59 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+0x1b9/0x294 lib/dump_stack.c:113 print_unlock_imbalance_bug.cold.50+0xcc/0xd8 kernel/locking/lockdep.c:3484 __lock_release kernel/locking/lockdep.c:3691 [inline] lock_release+0x77a/0xa10 kernel/locking/lockdep.c:3939 __mutex_unlock_slowpath+0xeb/0x8a0 kernel/locking/mutex.c:1018 mutex_unlock+0xd/0x10 kernel/locking/mutex.c:614 ucma_event_handler+0x780/0xff0 drivers/infiniband/core/ucma.c:390 addr_handler+0x2bd/0x3d0 drivers/infiniband/core/cma.c:2820 process_one_req+0x2e8/0x750 drivers/infiniband/core/addr.c:616 process_one_work+0xc1e/0x1b50 kernel/workqueue.c:2145 worker_thread+0x1cc/0x1440 kernel/workqueue.c:2279 kthread+0x345/0x410 kernel/kthread.c:240 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412