================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3150/0x4710 kernel/locking/lockdep.c:3200 Read of size 8 at addr ffff88808ce18410 by task kworker/u4:3/7590 CPU: 0 PID: 7590 Comm: kworker/u4:3 Not tainted 5.0.0-rc7-next-20190219 #38 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 __lock_acquire+0x3150/0x4710 kernel/locking/lockdep.c:3200 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3833 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1310 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 addr_handler+0xaf/0x3d0 drivers/infiniband/core/cma.c:3007 process_one_req+0x109/0x680 drivers/infiniband/core/addr.c:643 process_one_work+0x98e/0x1790 kernel/workqueue.c:2267 worker_thread+0x98/0xe40 kernel/workqueue.c:2413 kthread+0x357/0x430 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Allocated by task 5436: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:511 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3615 kmalloc include/linux/slab.h:548 [inline] kzalloc include/linux/slab.h:743 [inline] __rdma_create_id+0x5f/0x4e0 drivers/infiniband/core/cma.c:879 ucma_create_id+0x1de/0x640 drivers/infiniband/core/ucma.c:506 ucma_write+0x2da/0x3c0 drivers/infiniband/core/ucma.c:1696 __vfs_write+0x8d/0x110 fs/read_write.c:485 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0xea/0x1f0 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 5453: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459 kasan_slab_free+0xe/0x10 mm/kasan/common.c:467 __cache_free mm/slab.c:3491 [inline] kfree+0xcf/0x230 mm/slab.c:3816 rdma_destroy_id+0x723/0xab0 drivers/infiniband/core/cma.c:1853 ucma_close+0x115/0x320 drivers/infiniband/core/ucma.c:1777 __fput+0x2e5/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 get_signal+0x1961/0x1d50 kernel/signal.c:2390 do_signal+0x87/0x1940 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808ce18080 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 912 bytes inside of 2048-byte region [ffff88808ce18080, ffff88808ce18880) The buggy address belongs to the page: page:ffffea0002338600 count:1 mapcount:0 mapping:ffff88812c3f0c40 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0002a51f88 ffffea00022f1208 ffff88812c3f0c40 raw: 0000000000000000 ffff88808ce18080 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808ce18300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808ce18380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808ce18400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808ce18480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808ce18500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================