===================================== WARNING: bad unlock balance detected! 5.0.0-rc6+ #69 Not tainted ------------------------------------- kworker/u4:0/7 is trying to release lock (&file->mut) at: [] ucma_event_handler+0x711/0xef0 drivers/infiniband/core/ucma.c:394 but there are no more locks to release! other info that might help us debug this: 4 locks held by kworker/u4:0/7: #0: 00000000d9810187 ((wq_completion)"ib_addr"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 00000000d9810187 ((wq_completion)"ib_addr"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000d9810187 ((wq_completion)"ib_addr"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000d9810187 ((wq_completion)"ib_addr"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 00000000d9810187 ((wq_completion)"ib_addr"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 00000000d9810187 ((wq_completion)"ib_addr"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 00000000d9810187 ((wq_completion)"ib_addr"){+.+.}, at: process_one_work+0x87e/0x1790 kernel/workqueue.c:2144 kobject: 'loop1' (0000000019445f36): kobject_uevent_env #1: 00000000d9a08688 ((work_completion)(&(&req->work)->work)){+.+.}, at: process_one_work+0x8b4/0x1790 kernel/workqueue.c:2148 #2: 00000000a4bcf14e (&id_priv->handler_mutex){+.+.}, at: addr_handler+0xa5/0x300 drivers/infiniband/core/cma.c:2970 #3: 000000008d87b92d (&file->mut){+.+.}, at: ucma_event_handler+0xb3/0xef0 drivers/infiniband/core/ucma.c:354 stack backtrace: CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 5.0.0-rc6+ #69 kobject: 'loop1' (0000000019445f36): fill_kobj_path: path = '/devices/virtual/block/loop1' Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: ib_addr process_one_req kobject: 'kvm' (00000000cfa0622d): kobject_uevent_env Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 kobject: 'kvm' (00000000cfa0622d): fill_kobj_path: path = '/devices/virtual/misc/kvm' print_unlock_imbalance_bug kernel/locking/lockdep.c:3391 [inline] print_unlock_imbalance_bug.cold+0x114/0x123 kernel/locking/lockdep.c:3368 __lock_release kernel/locking/lockdep.c:3601 [inline] lock_release+0x67e/0xa00 kernel/locking/lockdep.c:3860 __mutex_unlock_slowpath+0x8e/0x6b0 kernel/locking/mutex.c:1197 kobject: 'loop4' (00000000b4c632eb): kobject_uevent_env mutex_unlock+0xd/0x10 kernel/locking/mutex.c:713 ucma_event_handler+0x711/0xef0 drivers/infiniband/core/ucma.c:394 kobject: 'loop4' (00000000b4c632eb): fill_kobj_path: path = '/devices/virtual/block/loop4' addr_handler+0x227/0x300 drivers/infiniband/core/cma.c:2994 process_one_req+0x109/0x680 drivers/infiniband/core/addr.c:643 process_one_work+0x98e/0x1790 kernel/workqueue.c:2173 ALSA: seq fatal error: cannot create timer (-22) worker_thread+0x98/0xe40 kernel/workqueue.c:2319 kthread+0x357/0x430 kernel/kthread.c:246 kobject: 'loop3' (00000000e2db3c9f): kobject_uevent_env ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 kobject: 'kvm' (00000000cfa0622d): kobject_uevent_env ALSA: seq fatal error: cannot create timer (-22) kobject: 'kvm' (00000000cfa0622d): kobject_uevent_env kobject: 'kvm' (00000000cfa0622d): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (00000000cfa0622d): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop3' (00000000e2db3c9f): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'kvm' (00000000cfa0622d): kobject_uevent_env kobject: 'loop4' (00000000b4c632eb): kobject_uevent_env kobject: 'kvm' (00000000cfa0622d): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop4' (00000000b4c632eb): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000e2db3c9f): kobject_uevent_env kobject: 'loop3' (00000000e2db3c9f): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (00000000e553bdd8): kobject_uevent_env kobject: 'loop5' (00000000e553bdd8): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (00000000b4c632eb): kobject_uevent_env kobject: 'loop4' (00000000b4c632eb): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop1' (0000000019445f36): kobject_uevent_env kobject: 'loop1' (0000000019445f36): fill_kobj_path: path = '/devices/virtual/block/loop1'