================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic64_dec_if_positive include/asm-generic/atomic-instrumented.h:1176 [inline] BUG: KASAN: use-after-free in atomic_long_dec_if_positive include/asm-generic/atomic-long.h:515 [inline] BUG: KASAN: use-after-free in dec_ucount+0x54/0x130 kernel/ucount.c:245 Write of size 8 at addr ffff88809aa15440 by task kworker/u4:4/132 CPU: 1 PID: 132 Comm: kworker/u4:4 Not tainted 5.14.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:436 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic64_dec_if_positive include/asm-generic/atomic-instrumented.h:1176 [inline] atomic_long_dec_if_positive include/asm-generic/atomic-long.h:515 [inline] dec_ucount+0x54/0x130 kernel/ucount.c:245 dec_net_namespaces net/core/net_namespace.c:394 [inline] cleanup_net+0x6f3/0xb10 net/core/net_namespace.c:611 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 17731: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] alloc_ucounts+0x23d/0x5b0 kernel/ucount.c:169 set_cred_ucounts+0x171/0x3a0 kernel/cred.c:684 copy_creds+0x70e/0xb60 kernel/cred.c:375 copy_process+0x13c5/0x74d0 kernel/fork.c:1992 kernel_clone+0xe7/0xac0 kernel/fork.c:2509 __do_sys_clone+0xc8/0x110 kernel/fork.c:2626 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 17731: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1625 [inline] slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1650 slab_free mm/slub.c:3210 [inline] kfree+0xeb/0x650 mm/slub.c:4262 put_ucounts kernel/ucount.c:200 [inline] put_ucounts+0x117/0x150 kernel/ucount.c:192 put_cred_rcu+0x27a/0x520 kernel/cred.c:124 rcu_do_batch kernel/rcu/tree.c:2550 [inline] rcu_core+0x7ab/0x1380 kernel/rcu/tree.c:2785 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3029 [inline] call_rcu+0xb1/0x750 kernel/rcu/tree.c:3109 neigh_parms_release net/core/neighbour.c:1667 [inline] neigh_parms_release+0x1f5/0x280 net/core/neighbour.c:1657 inetdev_destroy net/ipv4/devinet.c:325 [inline] inetdev_event+0xd2d/0x15d0 net/ipv4/devinet.c:1598 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2123 call_netdevice_notifiers_extack net/core/dev.c:2135 [inline] call_netdevice_notifiers net/core/dev.c:2149 [inline] unregister_netdevice_many+0x951/0x1790 net/core/dev.c:11093 default_device_exit_batch+0x2fa/0x3c0 net/core/dev.c:11623 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:178 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:595 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88809aa15400 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 64 bytes inside of 192-byte region [ffff88809aa15400, ffff88809aa154c0) The buggy address belongs to the page: page:ffffea00026a8540 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9aa15 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00009e95c0 0000000c00000003 ffff888010841a00 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 7959, ts 955712516197, free_ts 955663581331 prep_new_page mm/page_alloc.c:2436 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4169 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5391 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244 alloc_slab_page mm/slub.c:1688 [inline] allocate_slab+0x32e/0x4b0 mm/slub.c:1828 new_slab mm/slub.c:1891 [inline] new_slab_objects mm/slub.c:2637 [inline] ___slab_alloc+0x4ba/0x820 mm/slub.c:2800 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2840 slab_alloc_node mm/slub.c:2922 [inline] slab_alloc mm/slub.c:2964 [inline] kmem_cache_alloc_trace+0x30f/0x3c0 mm/slub.c:2981 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] kset_create lib/kobject.c:969 [inline] kset_create_and_add+0x4b/0x190 lib/kobject.c:1012 register_queue_kobjects net/core/net-sysfs.c:1703 [inline] netdev_register_kobject+0x1c6/0x430 net/core/net-sysfs.c:1959 register_netdevice+0xd33/0x1500 net/core/dev.c:10349 veth_newlink+0x3f5/0xad0 drivers/net/veth.c:1516 __rtnl_newlink+0x106e/0x1760 net/core/rtnetlink.c:3460 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3508 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5574 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1346 [inline] free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1397 free_unref_page_prepare mm/page_alloc.c:3332 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3411 __vunmap+0x783/0xb70 mm/vmalloc.c:2587 free_work+0x58/0x70 mm/vmalloc.c:82 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff88809aa15300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88809aa15380: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88809aa15400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809aa15480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88809aa15500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================