bond6 (unregistering): Released all slaves bond7 (unregistering): Released all slaves bond8 (unregistering): Released all slaves bond9 (unregistering): Released all slaves ================================================================== BUG: KASAN: slab-use-after-free in fib_rules_lookup+0x15e/0xeb0 net/core/fib_rules.c:321 Read of size 8 at addr ffff88801cb08680 by task kworker/u8:19/9869 CPU: 0 UID: 0 PID: 9869 Comm: kworker/u8:19 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: netns cleanup_net 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 fib_rules_lookup+0x15e/0xeb0 net/core/fib_rules.c:321 __fib_lookup+0x106/0x210 net/ipv4/fib_rules.c:96 ip_route_output_key_hash_rcu+0x294/0x2720 net/ipv4/route.c:2811 ip_route_output_key_hash+0x18d/0x2a0 net/ipv4/route.c:2702 __ip_route_output_key include/net/route.h:169 [inline] ip_route_output_flow+0x2a/0x150 net/ipv4/route.c:2929 ip4_datagram_release_cb+0x89d/0xbe0 net/ipv4/datagram.c:118 release_sock+0x206/0x260 net/core/sock.c:3861 inet_shutdown+0x2b1/0x390 net/ipv4/af_inet.c:950 udp_tunnel_sock_release+0x6d/0x80 net/ipv4/udp_tunnel_core.c:197 fou_release net/ipv4/fou_core.c:562 [inline] fou_exit_net+0x17d/0x1f0 net/ipv4/fou_core.c:1230 ops_exit_list net/core/net_namespace.c:199 [inline] ops_undo_list+0x43d/0x8d0 net/core/net_namespace.c:252 cleanup_net+0x572/0x810 net/core/net_namespace.c:702 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3478 kthread+0x389/0x470 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 5629: 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:5296 [inline] __kmalloc_node_track_caller_noprof+0x4d7/0x7b0 mm/slub.c:5408 kmemdup_noprof+0x2b/0x70 mm/util.c:138 kmemdup_noprof include/linux/fortify-string.h:763 [inline] fib_rules_register+0x2f/0x400 net/core/fib_rules.c:170 fib4_rules_init+0x21/0x160 net/ipv4/fib_rules.c:508 ip_fib_net_init net/ipv4/fib_frontend.c:1578 [inline] fib_net_init+0x17a/0x3e0 net/ipv4/fib_frontend.c:1628 ops_init+0x35d/0x5d0 net/core/net_namespace.c:137 setup_net+0x118/0x350 net/core/net_namespace.c:446 copy_net_ns+0x4f9/0x720 net/core/net_namespace.c:579 create_new_namespaces+0x3f0/0x6b0 kernel/nsproxy.c:132 unshare_nsproxy_namespaces+0x149/0x190 kernel/nsproxy.c:234 ksys_unshare+0x57d/0xa00 kernel/fork.c:3242 __do_sys_unshare kernel/fork.c:3316 [inline] __se_sys_unshare kernel/fork.c:3314 [inline] __x64_sys_unshare+0x38/0x50 kernel/fork.c:3314 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 5632: 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:2689 [inline] __rcu_free_sheaf_prepare+0x12d/0x2a0 mm/slub.c:2940 rcu_free_sheaf+0x31/0x200 mm/slub.c:5850 rcu_do_batch kernel/rcu/tree.c:2617 [inline] rcu_core+0x78b/0x10a0 kernel/rcu/tree.c:2869 handle_softirqs+0x225/0x840 kernel/softirq.c:622 do_softirq+0x76/0xd0 kernel/softirq.c:523 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450 do_ip_getsockopt+0x11b9/0x1d10 net/ipv4/ip_sockglue.c:1703 ip_getsockopt+0xbb/0x230 net/ipv4/ip_sockglue.c:1765 do_sock_getsockopt+0x51d/0x7e0 net/socket.c:2488 __sys_getsockopt net/socket.c:2519 [inline] __do_sys_getsockopt net/socket.c:2526 [inline] __se_sys_getsockopt net/socket.c:2523 [inline] __x64_sys_getsockopt+0x1a4/0x240 net/socket.c:2523 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 The buggy address belongs to the object at ffff88801cb08600 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 128 bytes inside of freed 192-byte region [ffff88801cb08600, ffff88801cb086c0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1cb08 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88813fe163c0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800100010 00000000f5000000 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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 4195446844, free_ts 4194942309 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x22d/0x280 mm/page_alloc.c:1853 prep_new_page mm/page_alloc.c:1861 [inline] get_page_from_freelist+0x24ae/0x2530 mm/page_alloc.c:3941 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5221 alloc_slab_page mm/slub.c:3278 [inline] allocate_slab+0x77/0x660 mm/slub.c:3467 new_slab mm/slub.c:3525 [inline] refill_objects+0x336/0x3d0 mm/slub.c:7272 refill_sheaf mm/slub.c:2816 [inline] __pcs_replace_empty_main+0x320/0x720 mm/slub.c:4652 alloc_from_pcs mm/slub.c:4750 [inline] slab_alloc_node mm/slub.c:4884 [inline] __kmalloc_cache_noprof+0x388/0x660 mm/slub.c:5415 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] call_usermodehelper_setup+0x8e/0x270 kernel/umh.c:362 kobject_uevent_env+0x662/0x9e0 lib/kobject_uevent.c:631 driver_register+0x2d4/0x320 drivers/base/driver.c:257 do_one_initcall+0x250/0x870 init/main.c:1392 do_initcall_level+0x10a/0x1a0 init/main.c:1454 do_initcalls+0x59/0xa0 init/main.c:1470 kernel_init_freeable+0x29d/0x3e0 init/main.c:1703 kernel_init+0x1d/0x1d0 init/main.c:1593 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 page last free pid 57 tgid 57 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1397 [inline] __free_frozen_pages+0xc0d/0xd20 mm/page_alloc.c:2938 __kasan_populate_vmalloc_do mm/kasan/shadow.c:393 [inline] __kasan_populate_vmalloc+0x1a8/0x1c0 mm/kasan/shadow.c:424 kasan_populate_vmalloc include/linux/kasan.h:580 [inline] alloc_vmap_area+0xd1a/0x1420 mm/vmalloc.c:2123 __get_vm_area_node+0x1f2/0x300 mm/vmalloc.c:3226 __vmalloc_node_range_noprof+0x358/0x1730 mm/vmalloc.c:4024 __vmalloc_node_noprof+0xc2/0x100 mm/vmalloc.c:4124 alloc_thread_stack_node kernel/fork.c:357 [inline] dup_task_struct+0x28e/0x830 kernel/fork.c:926 copy_process+0x79d/0x4380 kernel/fork.c:2090 kernel_clone+0x2d7/0x940 kernel/fork.c:2722 user_mode_thread+0x110/0x180 kernel/fork.c:2798 call_usermodehelper_exec_work+0x5c/0x230 kernel/umh.c:171 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3478 kthread+0x389/0x470 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 Memory state around the buggy address: ffff88801cb08580: 00 00 00 00 00 00 00 05 fc fc fc fc fc fc fc fc ffff88801cb08600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801cb08680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88801cb08700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801cb08780: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ==================================================================