================================================================== BUG: KASAN: slab-use-after-free in __hlist_del include/linux/list.h:982 [inline] BUG: KASAN: slab-use-after-free in hlist_del_rcu include/linux/rculist.h:560 [inline] BUG: KASAN: slab-use-after-free in __xfrm_state_delete+0x518/0xb58 net/xfrm/xfrm_state.c:830 Write of size 8 at addr ffff0000f26d88b0 by task kworker/u8:1/14 CPU: 1 UID: 0 PID: 14 Comm: kworker/u8:1 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/18/2025 Workqueue: netns cleanup_net Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xa8/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0xb0/0x110 mm/kasan/report.c:595 __asan_report_store8_noabort+0x20/0x2c mm/kasan/report_generic.c:386 __hlist_del include/linux/list.h:982 [inline] hlist_del_rcu include/linux/rculist.h:560 [inline] __xfrm_state_delete+0x518/0xb58 net/xfrm/xfrm_state.c:830 xfrm_state_delete net/xfrm/xfrm_state.c:856 [inline] xfrm_state_flush+0x438/0x760 net/xfrm/xfrm_state.c:939 xfrm6_tunnel_net_exit+0x40/0x100 net/ipv6/xfrm6_tunnel.c:337 ops_exit_list net/core/net_namespace.c:198 [inline] ops_undo_list+0x3c0/0x7ec net/core/net_namespace.c:251 cleanup_net+0x3e4/0x6c0 net/core/net_namespace.c:682 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3400 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 Allocated by task 6990: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:562 unpoison_slab_object mm/kasan/common.c:330 [inline] __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:356 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4180 [inline] slab_alloc_node mm/slub.c:4229 [inline] kmem_cache_alloc_noprof+0x238/0x3e8 mm/slub.c:4236 xfrm_state_alloc+0x2c/0x264 net/xfrm/xfrm_state.c:733 __find_acq_core+0x720/0x1540 net/xfrm/xfrm_state.c:1833 xfrm_find_acq+0x94/0xcc net/xfrm/xfrm_state.c:2353 xfrm_alloc_userspi+0x52c/0x9c8 net/xfrm/xfrm_user.c:1863 xfrm_user_rcv_msg+0x588/0x7c4 net/xfrm/xfrm_user.c:3501 netlink_rcv_skb+0x220/0x3fc net/netlink/af_netlink.c:2552 xfrm_netlink_rcv+0x80/0x9c net/xfrm/xfrm_user.c:3523 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x694/0x8c4 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x648/0x930 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg net/socket.c:729 [inline] ____sys_sendmsg+0x490/0x7b8 net/socket.c:2614 ___sys_sendmsg+0x204/0x278 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __arm64_sys_sendmsg+0x184/0x238 net/socket.c:2703 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Freed by task 6615: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x74/0x98 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2417 [inline] slab_free mm/slub.c:4680 [inline] kmem_cache_free+0x184/0x550 mm/slub.c:4782 xfrm_state_free net/xfrm/xfrm_state.c:591 [inline] xfrm_state_gc_destroy net/xfrm/xfrm_state.c:618 [inline] xfrm_state_gc_task+0x468/0x560 net/xfrm/xfrm_state.c:634 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3400 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 The buggy address belongs to the object at ffff0000f26d8880 which belongs to the cache xfrm_state of size 928 The buggy address is located 48 bytes inside of freed 928-byte region [ffff0000f26d8880, ffff0000f26d8c20) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff0000f26d8cc0 pfn:0x1326d8 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c30c3b40 dead000000000122 0000000000000000 raw: ffff0000f26d8cc0 00000000800f000b 00000000f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c30c3b40 dead000000000122 0000000000000000 head: ffff0000f26d8cc0 00000000800f000b 00000000f5000000 0000000000000000 head: 05ffc00000000002 fffffdffc3c9b601 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f26d8780: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff0000f26d8800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000f26d8880: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f26d8900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f26d8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== netdevsim netdevsim6 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim6 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim6 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim6 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0