================================================================== BUG: KASAN: use-after-free in __write_once_size include/linux/compiler.h:221 [inline] BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:748 [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:1318 Write of size 8 at addr ffff8880a4811680 by task kworker/0:1/12 CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.2.0-rc5+ #45 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+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_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:137 __write_once_size include/linux/compiler.h:221 [inline] __hlist_del include/linux/list.h:748 [inline] hlist_del_rcu include/linux/rculist.h:455 [inline] xfrm_hash_rebuild+0xfff/0x10f0 net/xfrm/xfrm_policy.c:1318 process_one_work+0x989/0x1790 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Allocated by task 8485: 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:3660 [inline] __kmalloc+0x15c/0x740 mm/slab.c:3669 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:742 [inline] xfrm_hash_alloc+0xd1/0x100 net/xfrm/xfrm_hash.c:21 xfrm_policy_init net/xfrm/xfrm_policy.c:4036 [inline] xfrm_net_init net/xfrm/xfrm_policy.c:4120 [inline] xfrm_net_init+0x227/0xa30 net/xfrm/xfrm_policy.c:4105 ops_init+0xb3/0x410 net/core/net_namespace.c:130 setup_net+0x2cc/0x880 net/core/net_namespace.c:327 copy_net_ns+0x1df/0x340 net/core/net_namespace.c:456 create_new_namespaces+0x400/0x7b0 kernel/nsproxy.c:103 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:202 ksys_unshare+0x440/0x980 kernel/fork.c:2692 __do_sys_unshare kernel/fork.c:2760 [inline] __se_sys_unshare kernel/fork.c:2758 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2758 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 5: 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 xfrm_hash_free+0xc3/0xe0 net/xfrm/xfrm_hash.c:35 xfrm_bydst_resize net/xfrm/xfrm_policy.c:602 [inline] xfrm_hash_resize+0x695/0x1600 net/xfrm/xfrm_policy.c:680 process_one_work+0x989/0x1790 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8880a4811680 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff8880a4811680, ffff8880a48116c0) The buggy address belongs to the page: page:ffffea0002920440 refcount:1 mapcount:0 mapping:ffff8880aa400340 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00025b05c8 ffffea0002426588 ffff8880aa400340 raw: 0000000000000000 ffff8880a4811000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a4811580: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8880a4811600: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff8880a4811680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8880a4811700: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880a4811780: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================