================================================================== 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+0x9e0/0xac0 mm/filemap.c:175 Read of size 4 at addr ffff88811320a470 by task kswapd0/39 CPU: 1 PID: 39 Comm: kswapd0 Tainted: G W 5.10.240-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x169/0x1d8 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 __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+0x9e0/0xac0 mm/filemap.c:175 __delete_from_page_cache+0xc4/0x460 mm/filemap.c:243 __remove_mapping+0x562/0x690 mm/vmscan.c:985 shrink_page_list+0x2109/0x4120 mm/vmscan.c:1498 shrink_inactive_list+0x4f4/0xe80 mm/vmscan.c:2075 shrink_list mm/vmscan.c:2294 [inline] shrink_lruvec+0x2246/0x2770 mm/vmscan.c:5473 shrink_node_memcgs mm/vmscan.c:5660 [inline] shrink_node+0xf0c/0x2690 mm/vmscan.c:5690 kswapd_shrink_node mm/vmscan.c:6444 [inline] balance_pgdat mm/vmscan.c:6601 [inline] kswapd+0x154e/0x2f90 mm/vmscan.c:6858 kthread+0x346/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Allocated by task 0: (stack is not available) Freed by task 489: 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:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1595 [inline] slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1621 slab_free mm/slub.c:3203 [inline] kfree+0xc0/0x270 mm/slub.c:4191 skb_free_head net/core/skbuff.c:606 [inline] skb_release_data+0x532/0x670 net/core/skbuff.c:626 skb_release_all net/core/skbuff.c:680 [inline] __kfree_skb net/core/skbuff.c:694 [inline] kfree_skb+0xb9/0x2f0 net/core/skbuff.c:713 ip_tunnel_xmit+0xf22/0x2280 net/ipv4/ip_tunnel.c:834 __gre_xmit net/ipv4/ip_gre.c:469 [inline] gre_tap_xmit+0x4f3/0x6e0 net/ipv4/ip_gre.c:746 __netdev_start_xmit include/linux/netdevice.h:4864 [inline] netdev_start_xmit include/linux/netdevice.h:4878 [inline] xmit_one net/core/dev.c:3608 [inline] dev_hard_start_xmit+0x244/0x670 net/core/dev.c:3624 sch_direct_xmit+0x24b/0x8b0 net/sched/sch_generic.c:336 qdisc_restart net/sched/sch_generic.c:401 [inline] __qdisc_run+0x9be/0x1330 net/sched/sch_generic.c:409 qdisc_run+0x10a/0x300 include/net/pkt_sched.h:127 __dev_xmit_skb net/core/dev.c:3819 [inline] __dev_queue_xmit+0xbc7/0x2540 net/core/dev.c:4175 dev_queue_xmit+0x17/0x20 net/core/dev.c:4243 br_dev_queue_push_xmit+0x569/0x6e0 net/bridge/br_forward.c:52 NF_HOOK include/linux/netfilter.h:299 [inline] br_forward_finish net/bridge/br_forward.c:65 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] __br_forward+0x208/0x2f0 net/bridge/br_forward.c:109 deliver_clone net/bridge/br_forward.c:125 [inline] maybe_deliver+0x1ca/0x2b0 net/bridge/br_forward.c:181 br_flood+0x2e7/0x420 net/bridge/br_forward.c:223 br_handle_frame_finish+0xd17/0x1180 net/bridge/br_input.c:173 nf_hook_bridge_pre net/bridge/br_input.c:259 [inline] br_handle_frame+0x407/0x8e0 net/bridge/br_input.c:363 __netif_receive_skb_core+0xe95/0x2f90 net/core/dev.c:5296 __netif_receive_skb_one_core net/core/dev.c:5400 [inline] __netif_receive_skb+0x72/0x280 net/core/dev.c:5516 process_backlog+0x368/0x600 net/core/dev.c:6423 napi_poll net/core/dev.c:6874 [inline] net_rx_action+0x432/0xdd0 net/core/dev.c:6944 __do_softirq+0x255/0x563 kernel/softirq.c:309 The buggy address belongs to the object at ffff88811320a000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 1136 bytes inside of 4096-byte region [ffff88811320a000, ffff88811320b000) The buggy address belongs to the page: page:ffffea00044c8200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113208 head:ffffea00044c8200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042c00 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 489, ts 1739815798533, free_ts 1737387251085 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2235/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5357 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1808 [inline] new_slab+0x84/0x3f0 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x2a6/0x450 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] __kmalloc_track_caller+0x1ef/0x320 mm/slub.c:4536 __kmalloc_reserve net/core/skbuff.c:144 [inline] pskb_expand_head+0x123/0x1110 net/core/skbuff.c:1653 __skb_cow include/linux/skbuff.h:3247 [inline] skb_cow_head include/linux/skbuff.h:3281 [inline] gre_tap_xmit+0x3c2/0x6e0 net/ipv4/ip_gre.c:743 __netdev_start_xmit include/linux/netdevice.h:4864 [inline] netdev_start_xmit include/linux/netdevice.h:4878 [inline] xmit_one net/core/dev.c:3608 [inline] dev_hard_start_xmit+0x244/0x670 net/core/dev.c:3624 sch_direct_xmit+0x24b/0x8b0 net/sched/sch_generic.c:336 qdisc_restart net/sched/sch_generic.c:401 [inline] __qdisc_run+0x9be/0x1330 net/sched/sch_generic.c:409 qdisc_run+0x10a/0x300 include/net/pkt_sched.h:127 __dev_xmit_skb net/core/dev.c:3819 [inline] __dev_queue_xmit+0xbc7/0x2540 net/core/dev.c:4175 dev_queue_xmit+0x17/0x20 net/core/dev.c:4243 br_dev_queue_push_xmit+0x569/0x6e0 net/bridge/br_forward.c:52 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] __free_pages_ok+0x7fc/0x820 mm/page_alloc.c:1629 free_the_page mm/page_alloc.c:5418 [inline] __free_pages+0xdd/0x380 mm/page_alloc.c:5427 __free_slab+0xcf/0x190 mm/slub.c:1894 free_slab mm/slub.c:1909 [inline] discard_slab+0x29/0x40 mm/slub.c:1915 __slab_free+0x313/0x3a0 mm/slub.c:3131 do_slab_free mm/slub.c:3191 [inline] ___cache_free+0x111/0x130 mm/slub.c:3210 qlink_free+0x50/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x160 mm/kasan/quarantine.c:283 ____kasan_kmalloc mm/kasan/common.c:475 [inline] __kasan_kmalloc+0x2f/0x110 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x1a7/0x330 mm/slub.c:4033 kmalloc_array include/linux/slab.h:592 [inline] kcalloc include/linux/slab.h:603 [inline] alloc_pipe_info+0x1fc/0x4b0 fs/pipe.c:804 get_pipe_inode fs/pipe.c:878 [inline] create_pipe_files+0x8d/0x6c0 fs/pipe.c:910 __do_pipe_flags+0x4f/0x200 fs/pipe.c:959 do_pipe2+0x99/0x170 fs/pipe.c:1007 __do_sys_pipe2 fs/pipe.c:1025 [inline] __se_sys_pipe2 fs/pipe.c:1023 [inline] __x64_sys_pipe2+0x5a/0x70 fs/pipe.c:1023 Memory state around the buggy address: ffff88811320a300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811320a380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811320a400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811320a480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811320a500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================