netdevsim netdevsim2 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim2 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 ================================================================== BUG: KASAN: slab-use-after-free in mini_qdisc_pair_swap+0x68/0x190 net/sched/sch_generic.c:1572 Read of size 8 at addr ffff88805e08e000 by task kworker/u8:5/750 CPU: 1 UID: 0 PID: 750 Comm: kworker/u8:5 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: netns cleanup_net Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 mini_qdisc_pair_swap+0x68/0x190 net/sched/sch_generic.c:1572 tcf_chain_head_change_item net/sched/cls_api.c:522 [inline] tcf_chain0_head_change_cb_del+0x24c/0x380 net/sched/cls_api.c:969 tcf_block_put_ext+0x129/0x390 net/sched/cls_api.c:1559 clsact_destroy+0x25e/0x8d0 net/sched/sch_ingress.c:302 __qdisc_destroy+0x153/0x420 net/sched/sch_generic.c:1081 dev_shutdown+0x233/0x440 net/sched/sch_generic.c:1496 unregister_netdevice_many_notify+0x118c/0x2390 net/core/dev.c:12272 unregister_netdevice_many net/core/dev.c:12347 [inline] unregister_netdevice_queue+0x33c/0x380 net/core/dev.c:12161 unregister_netdevice include/linux/netdevice.h:3389 [inline] nsim_destroy+0x1dd/0x670 drivers/net/netdevsim/netdev.c:1178 __nsim_dev_port_del+0x14d/0x1b0 drivers/net/netdevsim/dev.c:1473 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1485 [inline] nsim_dev_reload_destroy+0x288/0x490 drivers/net/netdevsim/dev.c:1707 nsim_dev_reload_down+0x8a/0xc0 drivers/net/netdevsim/dev.c:983 devlink_reload+0x1b6/0x8d0 net/devlink/dev.c:461 devlink_pernet_pre_exit+0x1d9/0x3d0 net/devlink/core.c:509 ops_pre_exit_list net/core/net_namespace.c:161 [inline] ops_undo_list+0x187/0x990 net/core/net_namespace.c:234 cleanup_net+0x4d8/0x820 net/core/net_namespace.c:695 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 7013: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:400 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417 kasan_kmalloc include/linux/kasan.h:262 [inline] __kmalloc_cache_noprof+0x3d5/0x6f0 mm/slub.c:5748 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] rxrpc_alloc_connection+0x7b/0x590 net/rxrpc/conn_object.c:62 rxrpc_prealloc_service_connection+0x26/0x2e0 net/rxrpc/conn_service.c:123 rxrpc_service_prealloc_one+0x2f5/0xe20 net/rxrpc/call_accept.c:86 afs_charge_preallocation+0x1fa/0x4e0 fs/afs/rxrpc.c:758 afs_open_socket+0x302/0x3a0 fs/afs/rxrpc.c:112 afs_net_init+0x67d/0x880 fs/afs/main.c:116 ops_init+0x35c/0x5c0 net/core/net_namespace.c:137 setup_net+0xfe/0x320 net/core/net_namespace.c:445 copy_net_ns+0x34e/0x4e0 net/core/net_namespace.c:580 create_new_namespaces+0x3f3/0x720 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:218 ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3129 __do_sys_unshare kernel/fork.c:3200 [inline] __se_sys_unshare kernel/fork.c:3198 [inline] __x64_sys_unshare+0x38/0x50 kernel/fork.c:3198 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 3488: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2523 [inline] slab_free mm/slub.c:6611 [inline] kfree+0x19a/0x6d0 mm/slub.c:6818 rxrpc_discard_prealloc+0x4c9/0x890 net/rxrpc/call_accept.c:212 rxrpc_listen+0x265/0x370 net/rxrpc/af_rxrpc.c:246 afs_close_socket+0xa2/0x3a0 fs/afs/rxrpc.c:130 afs_net_exit+0x60/0x100 fs/afs/main.c:149 ops_exit_list net/core/net_namespace.c:199 [inline] ops_undo_list+0x49a/0x990 net/core/net_namespace.c:252 cleanup_net+0x4d8/0x820 net/core/net_namespace.c:695 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff88805e08e000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 0 bytes inside of freed 2048-byte region [ffff88805e08e000, ffff88805e08e800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805e08c000 pfn:0x5e088 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88813ffa7000 ffffea0001632a10 ffffea00017c6810 raw: ffff88805e08c000 0000000000080002 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88813ffa7000 ffffea0001632a10 ffffea00017c6810 head: ffff88805e08c000 0000000000080002 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0001782201 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5829, tgid 5829 (syz-executor), ts 80016805450, free_ts 79967953275 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850 prep_new_page mm/page_alloc.c:1858 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:3039 [inline] allocate_slab+0x96/0x3a0 mm/slub.c:3212 new_slab mm/slub.c:3266 [inline] ___slab_alloc+0xe94/0x18a0 mm/slub.c:4636 __slab_alloc+0x65/0x100 mm/slub.c:4755 __slab_alloc_node mm/slub.c:4831 [inline] slab_alloc_node mm/slub.c:5253 [inline] __do_kmalloc_node mm/slub.c:5626 [inline] __kmalloc_node_noprof+0x5cc/0x800 mm/slub.c:5633 kmalloc_node_noprof include/linux/slab.h:987 [inline] qdisc_alloc+0x97/0xaa0 net/sched/sch_generic.c:950 qdisc_create_dflt+0x8e/0x4e0 net/sched/sch_generic.c:1012 attach_one_default_qdisc net/sched/sch_generic.c:1178 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2664 [inline] attach_default_qdiscs net/sched/sch_generic.c:1196 [inline] dev_activate+0x378/0x1150 net/sched/sch_generic.c:1255 __dev_open+0x69c/0x880 net/core/dev.c:1691 __dev_change_flags+0x1ea/0x6d0 net/core/dev.c:9637 netif_change_flags+0x88/0x1a0 net/core/dev.c:9700 do_setlink+0xc55/0x41c0 net/core/rtnetlink.c:3151 rtnl_changelink net/core/rtnetlink.c:3769 [inline] __rtnl_newlink net/core/rtnetlink.c:3928 [inline] rtnl_newlink+0x1619/0x1c80 net/core/rtnetlink.c:4065 page last free pid 5832 tgid 5832 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1394 [inline] __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906 discard_slab mm/slub.c:3310 [inline] __put_partials+0x146/0x170 mm/slub.c:3857 put_cpu_partial+0x1f2/0x2e0 mm/slub.c:3932 __slab_free+0x2b9/0x390 mm/slub.c:5906 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:352 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4955 [inline] slab_alloc_node mm/slub.c:5265 [inline] kmem_cache_alloc_node_noprof+0x433/0x710 mm/slub.c:5317 __alloc_skb+0x112/0x2d0 net/core/skbuff.c:660 alloc_skb include/linux/skbuff.h:1383 [inline] nlmsg_new include/net/netlink.h:1055 [inline] rtmsg_ifa+0xf8/0x1f0 net/ipv4/devinet.c:2014 __inet_insert_ifa+0x9ff/0xbf0 net/ipv4/devinet.c:565 inet_rtm_newaddr+0xf3a/0x18b0 net/ipv4/devinet.c:1001 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6951 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 Memory state around the buggy address: ffff88805e08df00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805e08df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805e08e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805e08e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805e08e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================