================================================================== BUG: KASAN: use-after-free in constant_test_bit arch/x86/include/asm/bitops.h:314 [inline] BUG: KASAN: use-after-free in work_is_static_object+0x2c/0x50 kernel/workqueue.c:445 Read of size 8 at addr ffff8880a881e978 by task syz-executor.2/8905 CPU: 1 PID: 8905 Comm: syz-executor.2 Not tainted 5.2.0-rc6+ #7 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+0x1d8/0x2f8 lib/dump_stack.c:113 print_address_description+0x6d/0x310 mm/kasan/report.c:188 __kasan_report+0x14b/0x1c0 mm/kasan/report.c:317 kasan_report+0x26/0x50 mm/kasan/common.c:614 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 constant_test_bit arch/x86/include/asm/bitops.h:314 [inline] work_is_static_object+0x2c/0x50 kernel/workqueue.c:445 debug_object_activate+0x136/0x700 lib/debugobjects.c:510 debug_work_activate kernel/workqueue.c:494 [inline] __queue_work+0xe9/0xc90 kernel/workqueue.c:1411 queue_work_on+0xc3/0x1a0 kernel/workqueue.c:1518 queue_work include/linux/workqueue.h:494 [inline] __rxrpc_put_local net/rxrpc/local_object.c:362 [inline] rxrpc_put_local+0xac/0xc0 net/rxrpc/local_object.c:378 rxrpc_release_sock net/rxrpc/af_rxrpc.c:904 [inline] rxrpc_release+0x360/0x4d0 net/rxrpc/af_rxrpc.c:930 __sock_release net/socket.c:601 [inline] sock_close+0xdb/0x280 net/socket.c:1273 __fput+0x2e4/0x740 fs/file_table.c:280 ____fput+0x15/0x20 fs/file_table.c:313 task_work_run+0x17e/0x1b0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:185 [inline] exit_to_usermode_loop arch/x86/entry/common.c:168 [inline] prepare_exit_to_usermode+0x402/0x4f0 arch/x86/entry/common.c:199 syscall_return_slowpath+0x110/0x440 arch/x86/entry/common.c:279 do_syscall_64+0x126/0x140 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413201 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffd5f38be80 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000413201 RDX: 0000000000000000 RSI: 0000000000000081 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00000000007607d8 R09: ffffffffffffffff R10: 00007ffd5f38bf50 R11: 0000000000000293 R12: 00000000007607e0 R13: 0000000000000003 R14: 0000000000000000 R15: ffffffffffffffff Allocated by task 8910: save_stack mm/kasan/common.c:71 [inline] set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:489 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:503 kmem_cache_alloc_trace+0x209/0x2c0 mm/slab.c:3555 kmalloc include/linux/slab.h:547 [inline] kzalloc include/linux/slab.h:742 [inline] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline] rxrpc_lookup_local+0x762/0x1710 net/rxrpc/local_object.c:279 rxrpc_bind+0x3a0/0x6e0 net/rxrpc/af_rxrpc.c:149 __sys_bind+0x305/0x400 net/socket.c:1653 __do_sys_bind net/socket.c:1664 [inline] __se_sys_bind net/socket.c:1662 [inline] __x64_sys_bind+0x7a/0x90 net/socket.c:1662 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9: save_stack mm/kasan/common.c:71 [inline] set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x12a/0x1e0 mm/kasan/common.c:451 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459 __cache_free mm/slab.c:3432 [inline] kfree+0xae/0x120 mm/slab.c:3755 rxrpc_local_rcu+0x56/0x70 net/rxrpc/local_object.c:471 __rcu_reclaim kernel/rcu/rcu.h:222 [inline] rcu_do_batch kernel/rcu/tree.c:2092 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2310 [inline] rcu_core+0x8d6/0xf90 kernel/rcu/tree.c:2291 __do_softirq+0x340/0x7b0 arch/x86/include/asm/paravirt.h:777 The buggy address belongs to the object at ffff8880a881e940 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 56 bytes inside of 1024-byte region [ffff8880a881e940, ffff8880a881ed40) The buggy address belongs to the page: page:ffffea0002a20780 refcount:1 mapcount:0 mapping:ffff8880aa400ac0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0002307d88 ffffea000242af08 ffff8880aa400ac0 raw: 0000000000000000 ffff8880a881e040 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a881e800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a881e880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8880a881e900: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8880a881e980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a881ea00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================