================================================================== 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+0x39/0x40 kernel/workqueue.c:445 Read of size 8 at addr ffff888088cf5b78 by task syz-executor.2/12680 CPU: 1 PID: 12680 Comm: syz-executor.2 Not tainted 5.2.0-rc6+ #34 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:188 __kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 kasan_report+0x12/0x20 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+0x39/0x40 kernel/workqueue.c:445 debug_object_activate+0x291/0x4e0 lib/debugobjects.c:510 debug_work_activate kernel/workqueue.c:494 [inline] __queue_work+0xcf/0x1200 kernel/workqueue.c:1411 queue_work_on+0x192/0x200 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+0x24a/0x3a0 net/rxrpc/local_object.c:378 rxrpc_release_sock net/rxrpc/af_rxrpc.c:904 [inline] rxrpc_release+0x46e/0x830 net/rxrpc/af_rxrpc.c:930 __sock_release+0xce/0x2a0 net/socket.c:601 sock_close+0x1b/0x30 net/socket.c:1273 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:185 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:168 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_32_irqs_on arch/x86/entry/common.c:352 [inline] do_fast_syscall_32+0xb51/0xd7d arch/x86/entry/common.c:408 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7fd6849 Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:000000000847fbcc EFLAGS: 00000216 ORIG_RAX: 0000000000000006 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000000000 RDX: 0000000000000005 RSI: 00000000081707e0 RDI: 00000000081707d8 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 12687: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:503 kmem_cache_alloc_trace+0x151/0x750 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+0x64c/0x1b40 net/rxrpc/local_object.c:279 rxrpc_bind+0x34d/0x5e0 net/rxrpc/af_rxrpc.c:149 __sys_bind+0x239/0x290 net/socket.c:1653 __do_sys_bind net/socket.c:1664 [inline] __se_sys_bind net/socket.c:1662 [inline] __ia32_sys_bind+0x72/0xb0 net/socket.c:1662 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline] do_fast_syscall_32+0x27b/0xd7d arch/x86/entry/common.c:408 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 Freed by task 16: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459 __cache_free mm/slab.c:3432 [inline] kfree+0xcf/0x220 mm/slab.c:3755 rxrpc_local_rcu+0x53/0x60 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+0xba5/0x1500 kernel/rcu/tree.c:2291 __do_softirq+0x25c/0x94c kernel/softirq.c:292 The buggy address belongs to the object at ffff888088cf5b40 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 56 bytes inside of 1024-byte region [ffff888088cf5b40, ffff888088cf5f40) The buggy address belongs to the page: page:ffffea0002233d00 refcount:1 mapcount:0 mapping:ffff8880aa400ac0 index:0xffff888088cf5240 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00027a8c88 ffffea00022df708 ffff8880aa400ac0 raw: ffff888088cf5240 ffff888088cf4040 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888088cf5a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888088cf5a80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888088cf5b00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff888088cf5b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888088cf5c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================