================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:197 [inline] BUG: KASAN: use-after-free in lockdep_register_key+0x3b9/0x490 kernel/locking/lockdep.c:1023 Read of size 8 at addr ffff888099af2b18 by task syz-executor.4/13429 CPU: 1 PID: 13429 Comm: syz-executor.4 Not tainted 5.0.0-next-20190306 #4 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+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 __read_once_size include/linux/compiler.h:197 [inline] lockdep_register_key+0x3b9/0x490 kernel/locking/lockdep.c:1023 wq_init_lockdep kernel/workqueue.c:3444 [inline] alloc_workqueue+0x427/0xe70 kernel/workqueue.c:4263 xfs_init_mount_workqueues+0x5f/0x660 fs/xfs/xfs_super.c:836 xfs_fs_fill_super+0x749/0x1670 fs/xfs/xfs_super.c:1658 mount_bdev+0x307/0x3c0 fs/super.c:1346 xfs_fs_mount+0x35/0x40 fs/xfs/xfs_super.c:1834 legacy_get_tree+0xf2/0x200 fs/fs_context.c:584 vfs_get_tree+0x123/0x450 fs/super.c:1481 do_new_mount fs/namespace.c:2622 [inline] do_mount+0x1436/0x2c40 fs/namespace.c:2942 ksys_mount+0xdb/0x150 fs/namespace.c:3151 __do_sys_mount fs/namespace.c:3165 [inline] __se_sys_mount fs/namespace.c:3162 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3162 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45aaea Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 2d 8e fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 0a 8e fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007f75f873ba88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f75f873bb30 RCX: 000000000045aaea RDX: 00007f75f873bad0 RSI: 0000000020000080 RDI: 00007f75f873baf0 RBP: 0000000020000080 R08: 00007f75f873bb30 R09: 00007f75f873bad0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003 R13: 0000000000000000 R14: 00000000004dbf80 R15: 00000000ffffffff Allocated by task 8410: 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:3621 kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] alloc_perf_context+0x49/0xf0 kernel/events/core.c:4069 find_get_context.isra.0+0x145/0x5c0 kernel/events/core.c:4158 __do_sys_perf_event_open+0xbfb/0x24e0 kernel/events/core.c:10853 __se_sys_perf_event_open kernel/events/core.c:10686 [inline] __x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:10686 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8526: 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:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3821 free_ctx+0x42/0x50 kernel/events/core.c:1184 __rcu_reclaim kernel/rcu/rcu.h:227 [inline] rcu_do_batch kernel/rcu/tree.c:2475 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2788 [inline] rcu_core+0x928/0x1390 kernel/rcu/tree.c:2769 __do_softirq+0x266/0x95a kernel/softirq.c:293 The buggy address belongs to the object at ffff888099af2a00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 280 bytes inside of 512-byte region [ffff888099af2a00, ffff888099af2c00) The buggy address belongs to the page: page:ffffea000266bc80 count:1 mapcount:0 mapping:ffff88812c3f0940 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00023659c8 ffffea000244f4c8 ffff88812c3f0940 raw: 0000000000000000 ffff888099af2000 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888099af2a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888099af2a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888099af2b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888099af2b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888099af2c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================