================================================================== BUG: KASAN: slab-use-after-free in netdev_need_ops_lock include/net/netdev_lock.h:30 [inline] BUG: KASAN: slab-use-after-free in netdev_lock_ops include/net/netdev_lock.h:41 [inline] BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0x230/0x250 net/ethtool/ioctl.c:463 Read of size 1 at addr ffff88807e1a4e09 by task kworker/0:12/10248 CPU: 0 UID: 0 PID: 10248 Comm: kworker/0:12 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026 Workqueue: infiniband ib_cache_event_task Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 netdev_need_ops_lock include/net/netdev_lock.h:30 [inline] netdev_lock_ops include/net/netdev_lock.h:41 [inline] __ethtool_get_link_ksettings+0x230/0x250 net/ethtool/ioctl.c:463 __ethtool_get_link_ksettings+0x11f/0x250 net/ethtool/ioctl.c:464 ib_get_eth_speed+0x180/0x7f0 drivers/infiniband/core/verbs.c:2052 rxe_query_port+0x93/0x3d0 drivers/infiniband/sw/rxe/rxe_verbs.c:56 __ib_query_port drivers/infiniband/core/device.c:2129 [inline] ib_query_port+0x16e/0x830 drivers/infiniband/core/device.c:2161 ib_cache_update+0x1ba/0xc50 drivers/infiniband/core/cache.c:1456 ib_cache_event_task+0xd3/0x1c0 drivers/infiniband/core/cache.c:1535 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 5628: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5362 [inline] __kvmalloc_node_noprof+0x53f/0x860 mm/slub.c:6933 alloc_netdev_mqs+0xa9/0x12b0 net/core/dev.c:12064 rtnl_create_link+0x321/0xd70 net/core/rtnetlink.c:3757 rtnl_newlink_create+0x258/0x7b0 net/core/rtnetlink.c:3939 __rtnl_newlink net/core/rtnetlink.c:4078 [inline] rtnl_newlink+0x166d/0x1c30 net/core/rtnetlink.c:4195 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7112 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7bb/0x940 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:775 __sock_sendmsg net/socket.c:790 [inline] __sys_sendto+0x408/0x5a0 net/socket.c:2252 __do_sys_sendto net/socket.c:2259 [inline] __se_sys_sendto net/socket.c:2255 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2255 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5861: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2705 [inline] slab_free mm/slub.c:6405 [inline] kfree+0x1c5/0x640 mm/slub.c:6720 device_release+0xc4/0x1f0 drivers/base/core.c:-1 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x222/0x550 lib/kobject.c:737 netdev_run_todo+0xeee/0x1060 net/core/dev.c:11765 default_device_exit_batch+0x923/0x9a0 net/core/dev.c:13234 ops_exit_list net/core/net_namespace.c:206 [inline] ops_undo_list+0x4b4/0x8d0 net/core/net_namespace.c:253 cleanup_net+0x572/0x810 net/core/net_namespace.c:706 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 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 ffff88807e1a4000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 3593 bytes inside of freed 4096-byte region [ffff88807e1a4000, ffff88807e1a5000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88807e1a2000 pfn:0x7e1a0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88805986fcc1 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801b01b500 ffffea0001f85810 ffffea0001f26e10 raw: ffff88807e1a2000 0000000800040003 00000000f5000000 ffff88805986fcc1 head: 00fff00000000240 ffff88801b01b500 ffffea0001f85810 ffffea0001f26e10 head: ffff88807e1a2000 0000000800040003 00000000f5000000 ffff88805986fcc1 head: 00fff00000000003 fffffffffffffe01 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 5621, tgid 5621 (syz-executor), ts 91814683524, free_ts 91697380487 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0x21fa/0x2270 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3294 [inline] allocate_slab+0x79/0x5e0 mm/slub.c:3408 new_slab mm/slub.c:3454 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7338 refill_sheaf mm/slub.c:2832 [inline] __pcs_replace_empty_main+0x2bf/0x6b0 mm/slub.c:4703 alloc_from_pcs mm/slub.c:4801 [inline] slab_alloc_node mm/slub.c:4933 [inline] __do_kmalloc_node mm/slub.c:5361 [inline] __kmalloc_noprof+0x485/0x720 mm/slub.c:5387 _kmalloc_noprof include/linux/slab.h:973 [inline] _kzalloc_noprof include/linux/slab.h:1290 [inline] __register_sysctl_table+0x6f/0x1370 fs/proc/proc_sysctl.c:1378 __addrconf_sysctl_register+0x31c/0x4b0 net/ipv6/addrconf.c:7367 addrconf_sysctl_register+0x168/0x1c0 net/ipv6/addrconf.c:7415 ipv6_add_dev+0xd26/0x13a0 net/ipv6/addrconf.c:460 addrconf_notify+0x771/0x1050 net/ipv6/addrconf.c:3685 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2291 [inline] call_netdevice_notifiers net/core/dev.c:2305 [inline] register_netdevice+0x18a4/0x1eb0 net/core/dev.c:11489 hsr_dev_finalize+0x630/0xaa0 net/hsr/hsr_device.c:784 hsr_newlink+0x837/0x9a0 net/hsr/hsr_netlink.c:133 page last free pid 5625 tgid 5625 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0xc1e/0xd10 mm/page_alloc.c:2950 __slab_free+0x274/0x2c0 mm/slub.c:5767 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4612 [inline] slab_alloc_node mm/slub.c:4945 [inline] kmem_cache_alloc_lru_noprof+0x2aa/0x5f0 mm/slub.c:4978 alloc_inode+0x6a/0x1b0 fs/inode.c:338 new_inode+0x1f/0x170 fs/inode.c:1174 debugfs_get_inode fs/debugfs/inode.c:72 [inline] __debugfs_create_file+0xb8/0x400 fs/debugfs/inode.c:433 debugfs_create_file_full+0x3f/0x60 fs/debugfs/inode.c:460 ref_tracker_dir_debugfs+0x197/0x360 lib/ref_tracker.c:440 ref_tracker_dir_init include/linux/ref_tracker.h:70 [inline] alloc_netdev_mqs+0x275/0x12b0 net/core/dev.c:12071 rtnl_create_link+0x321/0xd70 net/core/rtnetlink.c:3757 veth_newlink+0x277/0xdd0 drivers/net/veth.c:1851 rtnl_newlink_create+0x305/0x7b0 net/core/rtnetlink.c:3949 __rtnl_newlink net/core/rtnetlink.c:4078 [inline] rtnl_newlink+0x166d/0x1c30 net/core/rtnetlink.c:4195 Memory state around the buggy address: ffff88807e1a4d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807e1a4d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807e1a4e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807e1a4e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807e1a4f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================