================================================================== 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 ffff8881183ca470 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 08/18/2025 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 347: 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_track_caller+0x13c/0x2c0 mm/slub.c:4959 kmalloc_reserve net/core/skbuff.c:357 [inline] pskb_expand_head+0x11b/0x11d0 net/core/skbuff.c:1733 __skb_cow include/linux/skbuff.h:3427 [inline] skb_cow_head include/linux/skbuff.h:3461 [inline] __vlan_insert_inner_tag include/linux/if_vlan.h:349 [inline] vlan_insert_inner_tag include/linux/if_vlan.h:419 [inline] vlan_insert_tag include/linux/if_vlan.h:444 [inline] vlan_insert_tag_set_proto include/linux/if_vlan.h:463 [inline] __vlan_hwaccel_push_inside include/linux/if_vlan.h:505 [inline] validate_xmit_vlan net/core/dev.c:3696 [inline] validate_xmit_skb+0x7db/0xbc0 net/core/dev.c:3731 __dev_queue_xmit+0x122a/0x2d80 net/core/dev.c:4287 dev_queue_xmit+0x17/0x20 net/core/dev.c:4329 br_dev_queue_push_xmit+0x52a/0x6a0 net/bridge/br_forward.c:53 NF_HOOK include/linux/netfilter.h:305 [inline] br_forward_finish+0xcc/0x210 net/bridge/br_forward.c:66 NF_HOOK include/linux/netfilter.h:305 [inline] __br_forward+0x3cd/0x4f0 net/bridge/br_forward.c:115 deliver_clone net/bridge/br_forward.c:131 [inline] maybe_deliver+0x1ca/0x2b0 net/bridge/br_forward.c:189 br_flood+0x2ea/0x420 net/bridge/br_forward.c:231 br_handle_frame_finish+0xdae/0x1200 net/bridge/br_input.c:180 nf_hook_bridge_pre net/bridge/br_input.c:264 [inline] br_handle_frame+0x8fc/0xf50 net/bridge/br_input.c:384 __netif_receive_skb_core+0xe49/0x2f10 net/core/dev.c:5427 __netif_receive_skb_one_core net/core/dev.c:5531 [inline] __netif_receive_skb+0x72/0x280 net/core/dev.c:5647 process_backlog+0x368/0x600 net/core/dev.c:6524 __napi_poll+0xbe/0x590 net/core/dev.c:7083 napi_poll net/core/dev.c:7150 [inline] net_rx_action+0x371/0x8e0 net/core/dev.c:7240 handle_softirqs+0x250/0x560 kernel/softirq.c:583 __do_softirq+0xb/0xd kernel/softirq.c:621 Freed by task 347: 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 skb_free_head net/core/skbuff.c:656 [inline] skb_release_data+0x814/0xa10 net/core/skbuff.c:678 skb_release_all net/core/skbuff.c:743 [inline] __kfree_skb net/core/skbuff.c:757 [inline] kfree_skb_reason net/core/skbuff.c:778 [inline] kfree_skb+0xb9/0x2f0 net/core/skbuff.c:792 ip6_mc_input+0x235/0x2a0 net/ipv6/ip6_input.c:572 dst_input include/net/dst.h:463 [inline] ip6_rcv_finish+0x18d/0x360 net/ipv6/ip6_input.c:79 NF_HOOK include/linux/netfilter.h:305 [inline] ipv6_rcv+0xe9/0x210 net/ipv6/ip6_input.c:300 __netif_receive_skb_one_core net/core/dev.c:5533 [inline] __netif_receive_skb+0xc8/0x280 net/core/dev.c:5647 netif_receive_skb_internal net/core/dev.c:5733 [inline] netif_receive_skb+0x98/0x3d0 net/core/dev.c:5792 br_netif_receive_skb net/bridge/br_input.c:30 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] br_pass_frame_up+0x238/0x410 net/bridge/br_input.c:70 br_handle_frame_finish+0xdd6/0x1200 net/bridge/br_input.c:186 nf_hook_bridge_pre net/bridge/br_input.c:264 [inline] br_handle_frame+0x8fc/0xf50 net/bridge/br_input.c:384 __netif_receive_skb_core+0xe49/0x2f10 net/core/dev.c:5427 __netif_receive_skb_one_core net/core/dev.c:5531 [inline] __netif_receive_skb+0x72/0x280 net/core/dev.c:5647 process_backlog+0x368/0x600 net/core/dev.c:6524 __napi_poll+0xbe/0x590 net/core/dev.c:7083 napi_poll net/core/dev.c:7150 [inline] net_rx_action+0x371/0x8e0 net/core/dev.c:7240 handle_softirqs+0x250/0x560 kernel/softirq.c:583 __do_softirq+0xb/0xd kernel/softirq.c:621 The buggy address belongs to the object at ffff8881183ca000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 1136 bytes inside of 4096-byte region [ffff8881183ca000, ffff8881183cb000) The buggy address belongs to the page: page:ffffea000460f200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1183c8 head:ffffea000460f200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043380 raw: 0000000000000000 0000000000040004 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 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 13, ts 457409901518, free_ts 456125476580 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] pskb_expand_head+0x11b/0x11d0 net/core/skbuff.c:1733 __skb_cow include/linux/skbuff.h:3427 [inline] skb_cow_head include/linux/skbuff.h:3461 [inline] __vlan_insert_inner_tag include/linux/if_vlan.h:349 [inline] vlan_insert_inner_tag include/linux/if_vlan.h:419 [inline] vlan_insert_tag include/linux/if_vlan.h:444 [inline] vlan_insert_tag_set_proto include/linux/if_vlan.h:463 [inline] __vlan_hwaccel_push_inside include/linux/if_vlan.h:505 [inline] validate_xmit_vlan net/core/dev.c:3696 [inline] validate_xmit_skb+0x7db/0xbc0 net/core/dev.c:3731 __dev_queue_xmit+0x122a/0x2d80 net/core/dev.c:4287 dev_queue_xmit+0x17/0x20 net/core/dev.c:4329 br_dev_queue_push_xmit+0x52a/0x6a0 net/bridge/br_forward.c:53 NF_HOOK include/linux/netfilter.h:305 [inline] br_forward_finish+0xcc/0x210 net/bridge/br_forward.c:66 NF_HOOK include/linux/netfilter.h:305 [inline] __br_forward+0x3cd/0x4f0 net/bridge/br_forward.c:115 deliver_clone net/bridge/br_forward.c:131 [inline] maybe_deliver+0x1ca/0x2b0 net/bridge/br_forward.c:189 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+0x29/0x40 mm/slub.c:2046 __slab_free+0x211/0x290 mm/slub.c:3431 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_zalloc include/linux/slab.h:737 [inline] __kernfs_new_node+0xdb/0x680 fs/kernfs/dir.c:593 kernfs_new_node+0x150/0x260 fs/kernfs/dir.c:669 __kernfs_create_file+0x4e/0x270 fs/kernfs/file.c:987 Memory state around the buggy address: ffff8881183ca300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881183ca380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881183ca400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881183ca480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881183ca500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================