================================================================== BUG: KASAN: use-after-free in __write_once_size include/linux/compiler.h:226 [inline] BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:762 [inline] BUG: KASAN: use-after-free in hlist_del_rcu include/linux/rculist.h:455 [inline] BUG: KASAN: use-after-free in xfrm_hash_rebuild+0xfff/0x10f0 net/xfrm/xfrm_policy.c:1315 Write of size 8 at addr ffff88808c27a800 by task kworker/0:1/12 CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.2.0-rc7-next-20190703 #28 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events xfrm_hash_rebuild Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351 __kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482 kasan_report+0x12/0x17 mm/kasan/common.c:614 __asan_report_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:137 __write_once_size include/linux/compiler.h:226 [inline] __hlist_del include/linux/list.h:762 [inline] hlist_del_rcu include/linux/rculist.h:455 [inline] xfrm_hash_rebuild+0xfff/0x10f0 net/xfrm/xfrm_policy.c:1315 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:353 Allocated by task 9451: 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 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x163/0x770 mm/slab.c:3665 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:747 [inline] xfrm_hash_alloc+0xd1/0x100 net/xfrm/xfrm_hash.c:21 xfrm_policy_init net/xfrm/xfrm_policy.c:4033 [inline] xfrm_net_init net/xfrm/xfrm_policy.c:4117 [inline] xfrm_net_init+0x227/0xa30 net/xfrm/xfrm_policy.c:4102 ops_init+0xb3/0x420 net/core/net_namespace.c:137 setup_net+0x2d2/0x890 net/core/net_namespace.c:334 copy_net_ns+0x290/0x41f net/core/net_namespace.c:475 create_new_namespaces+0x400/0x7b0 kernel/nsproxy.c:103 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:202 ksys_unshare+0x444/0x980 kernel/fork.c:2817 __do_sys_unshare kernel/fork.c:2885 [inline] __se_sys_unshare kernel/fork.c:2883 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2883 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9453: 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:3426 [inline] kfree+0x10a/0x2c0 mm/slab.c:3757 xfrm_hash_free+0xc3/0xe0 net/xfrm/xfrm_hash.c:35 xfrm_bydst_resize net/xfrm/xfrm_policy.c:599 [inline] xfrm_hash_resize+0x62c/0x1570 net/xfrm/xfrm_policy.c:677 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:353 The buggy address belongs to the object at ffff88808c27a800 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff88808c27a800, ffff88808c27a840) The buggy address belongs to the page: page:ffffea0002309e80 refcount:1 mapcount:0 mapping:ffff8880aa400380 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0002574048 ffffea00024fb388 ffff8880aa400380 raw: 0000000000000000 ffff88808c27a000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808c27a700: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff88808c27a780: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff88808c27a800: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88808c27a880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88808c27a900: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================