================================================================== BUG: KASAN: use-after-free in cleancache_fs_enabled_mapping include/linux/cleancache.h:56 [inline] BUG: KASAN: use-after-free in cleancache_invalidate_page include/linux/cleancache.h:110 [inline] BUG: KASAN: use-after-free in unaccount_page_cache_page+0x6f2/0x760 mm/filemap.c:172 Read of size 4 at addr ffff88810e2d6470 by task kswapd0/46 CPU: 1 PID: 46 Comm: kswapd0 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0xf1/0x140 mm/kasan/report.c:444 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 cleancache_fs_enabled_mapping include/linux/cleancache.h:56 [inline] cleancache_invalidate_page include/linux/cleancache.h:110 [inline] unaccount_page_cache_page+0x6f2/0x760 mm/filemap.c:172 __delete_from_page_cache+0xbe/0x420 mm/filemap.c:240 __remove_mapping+0x60b/0x930 mm/vmscan.c:1216 shrink_page_list+0x2778/0x5040 mm/vmscan.c:1824 shrink_inactive_list mm/vmscan.c:2331 [inline] shrink_list mm/vmscan.c:2576 [inline] shrink_lruvec+0x10f3/0x36a0 mm/vmscan.c:5793 shrink_node_memcgs mm/vmscan.c:5985 [inline] shrink_node+0x11e9/0x2a70 mm/vmscan.c:6015 kswapd_shrink_node mm/vmscan.c:6766 [inline] balance_pgdat+0xfba/0x2150 mm/vmscan.c:6956 kswapd+0x649/0xcf0 mm/vmscan.c:7215 kthread+0x411/0x500 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Allocated by task 17322: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc+0x13d/0x2c0 mm/slub.c:4436 kmalloc include/linux/slab.h:624 [inline] kzalloc include/linux/slab.h:750 [inline] arpt_alloc_initial_table+0x6c/0xcd0 net/ipv4/netfilter/arp_tables.c:40 arptable_filter_table_init+0x1b/0x60 net/ipv4/netfilter/arptable_filter.c:44 xt_find_table_lock+0x2a5/0x400 net/netfilter/x_tables.c:1259 xt_request_find_table_lock+0x27/0x100 net/netfilter/x_tables.c:1284 get_info net/ipv4/netfilter/arp_tables.c:807 [inline] do_arpt_get_ctl+0x65c/0xf30 net/ipv4/netfilter/arp_tables.c:1451 nf_getsockopt+0x26d/0x290 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x1060/0x1480 net/ipv4/ip_sockglue.c:1797 tcp_getsockopt+0x1de/0x20a0 net/ipv4/tcp.c:4311 sock_common_getsockopt+0x98/0xb0 net/core/sock.c:3441 __sys_getsockopt+0x207/0x410 net/socket.c:2247 __do_sys_getsockopt net/socket.c:2262 [inline] __se_sys_getsockopt net/socket.c:2259 [inline] __x64_sys_getsockopt+0xbf/0xd0 net/socket.c:2259 x64_sys_call+0x6db/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:56 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 17322: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kfree+0xc4/0x270 mm/slub.c:4588 arptable_filter_table_init+0x4b/0x60 net/ipv4/netfilter/arptable_filter.c:48 xt_find_table_lock+0x2a5/0x400 net/netfilter/x_tables.c:1259 xt_request_find_table_lock+0x27/0x100 net/netfilter/x_tables.c:1284 get_info net/ipv4/netfilter/arp_tables.c:807 [inline] do_arpt_get_ctl+0x65c/0xf30 net/ipv4/netfilter/arp_tables.c:1451 nf_getsockopt+0x26d/0x290 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x1060/0x1480 net/ipv4/ip_sockglue.c:1797 tcp_getsockopt+0x1de/0x20a0 net/ipv4/tcp.c:4311 sock_common_getsockopt+0x98/0xb0 net/core/sock.c:3441 __sys_getsockopt+0x207/0x410 net/socket.c:2247 __do_sys_getsockopt net/socket.c:2262 [inline] __se_sys_getsockopt net/socket.c:2259 [inline] __x64_sys_getsockopt+0xbf/0xd0 net/socket.c:2259 x64_sys_call+0x6db/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:56 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu_common kernel/rcu/tree.c:3011 [inline] call_rcu+0x105/0xfe0 kernel/rcu/tree.c:3129 netlink_release+0x1288/0x1690 net/netlink/af_netlink.c:803 __sock_release net/socket.c:649 [inline] sock_close+0xe0/0x270 net/socket.c:1336 __fput+0x20b/0x8b0 fs/file_table.c:311 ____fput+0x15/0x20 fs/file_table.c:339 task_work_run+0x127/0x190 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Second to last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 kvfree_call_rcu+0xae/0x7e0 kernel/rcu/tree.c:3648 drop_sysctl_table+0x2ef/0x410 fs/proc/proc_sysctl.c:1687 unregister_sysctl_table+0x7a/0x120 fs/proc/proc_sysctl.c:1725 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:175 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7193 [inline] addrconf_sysctl_unregister net/ipv6/addrconf.c:7221 [inline] addrconf_ifdown+0x152f/0x1880 net/ipv6/addrconf.c:3952 addrconf_notify+0x3bd/0xde0 net/ipv6/addrconf.c:-1 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2057 [inline] call_netdevice_notifiers_extack net/core/dev.c:2069 [inline] call_netdevice_notifiers net/core/dev.c:2083 [inline] unregister_netdevice_many+0xfb8/0x1990 net/core/dev.c:11150 default_device_exit_batch+0x330/0x390 net/core/dev.c:11683 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x602/0xad0 net/core/net_namespace.c:599 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472 kthread+0x411/0x500 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff88810e2d6000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1136 bytes inside of 2048-byte region [ffff88810e2d6000, ffff88810e2d6800) The buggy address belongs to the page: page:ffffea000438b400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10e2d0 head:ffffea000438b400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 0000000100000001 ffff888100043200 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 281, ts 30838628012, free_ts 30649665727 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5808 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa1/0x4d0 mm/slub.c:2000 ___slab_alloc+0x381/0x810 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0x21a/0x740 net/core/skbuff.c:428 alloc_skb include/linux/skbuff.h:1183 [inline] nlmsg_new include/net/netlink.h:953 [inline] inet6_ifinfo_notify+0x6e/0x110 net/ipv6/addrconf.c:6102 addrconf_notify+0xade/0xde0 net/ipv6/addrconf.c:3706 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2057 [inline] call_netdevice_notifiers_extack net/core/dev.c:2069 [inline] call_netdevice_notifiers net/core/dev.c:2083 [inline] __dev_notify_flags+0x28f/0x500 net/core/dev.c:-1 dev_change_flags+0xe8/0x1a0 net/core/dev.c:8937 do_setlink+0xbed/0x3990 net/core/rtnetlink.c:2779 __rtnl_newlink net/core/rtnetlink.c:3450 [inline] rtnl_newlink+0x13fa/0x17b0 net/core/rtnetlink.c:3572 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534 free_unref_page+0xa2/0x550 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5884 __free_slab+0xe8/0x1e0 mm/slub.c:2025 free_slab mm/slub.c:2040 [inline] discard_slab mm/slub.c:2046 [inline] __unfreeze_partials+0x160/0x190 mm/slub.c:2532 put_cpu_partial+0xc6/0x120 mm/slub.c:2612 __slab_free+0x1d4/0x290 mm/slub.c:3395 do_slab_free mm/slub.c:3514 [inline] ___cache_free+0x104/0x120 mm/slub.c:3535 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xf0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3245 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260 kmem_cache_alloc_node include/linux/slab.h:492 [inline] __alloc_skb+0xe0/0x740 net/core/skbuff.c:416 alloc_skb include/linux/skbuff.h:1183 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1186 [inline] netlink_sendmsg+0x602/0xb70 net/netlink/af_netlink.c:1897 Memory state around the buggy address: ffff88810e2d6300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810e2d6380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88810e2d6400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88810e2d6480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810e2d6500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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