================================================================== 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+0x9dc/0xac0 mm/filemap.c:175 Read of size 4 at addr ffff88812dd70470 by task syz.3.4396/9862 CPU: 1 PID: 9862 Comm: syz.3.4396 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 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+0x100/0x140 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+0x9dc/0xac0 mm/filemap.c:175 __delete_from_page_cache+0xc3/0x470 mm/filemap.c:243 __remove_mapping+0x581/0x6b0 mm/vmscan.c:985 shrink_page_list+0x21ee/0x4160 mm/vmscan.c:1498 shrink_inactive_list+0x90c/0xef0 mm/vmscan.c:2075 shrink_list mm/vmscan.c:2294 [inline] shrink_lruvec+0x281a/0x2ef0 mm/vmscan.c:5473 shrink_node_memcgs mm/vmscan.c:5660 [inline] shrink_node+0xee0/0x2690 mm/vmscan.c:5690 shrink_zones mm/vmscan.c:5896 [inline] do_try_to_free_pages+0x602/0x1590 mm/vmscan.c:5954 try_to_free_mem_cgroup_pages+0x261/0x610 mm/vmscan.c:6272 mem_cgroup_resize_max+0x309/0x3e0 mm/memcontrol.c:3387 mem_cgroup_write+0x1ed/0x230 mm/memcontrol.c:-1 cgroup_file_write+0x294/0x560 kernel/cgroup/cgroup.c:3902 kernfs_fop_write_iter+0x2bd/0x400 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2072 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x770/0xd70 fs/read_write.c:605 ksys_write+0x14a/0x260 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:667 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fadee3a6b19 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fadecdfe028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fadee62cfa0 RCX: 00007fadee3a6b19 RDX: 0000000000000050 RSI: 0000200000002e40 RDI: 0000000000000003 RBP: 00007fadee43eb70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fadee62d038 R14: 00007fadee62cfa0 R15: 00007ffd0361df98 Allocated by task 271: 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:430 [inline] __kasan_slab_alloc+0xb7/0xe0 mm/kasan/common.c:463 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:580 slab_alloc_node mm/slub.c:2952 [inline] slab_alloc mm/slub.c:2960 [inline] kmem_cache_alloc+0x15a/0x2d0 mm/slub.c:2965 kmem_cache_alloc_node include/linux/slab.h:426 [inline] __alloc_skb+0x9e/0x520 net/core/skbuff.c:200 alloc_skb_fclone include/linux/skbuff.h:1176 [inline] sk_stream_alloc_skb+0x216/0xb70 net/ipv4/tcp.c:887 tcp_sendmsg_locked+0xc92/0x34e0 net/ipv4/tcp.c:1295 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1447 inet_sendmsg+0xa5/0xc0 net/ipv4/af_inet.c:830 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] sock_write_iter+0x2a6/0x3a0 net/socket.c:1019 call_write_iter include/linux/fs.h:2072 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x770/0xd70 fs/read_write.c:605 ksys_write+0x14a/0x260 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:667 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 0: 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:1600 [inline] slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626 slab_free mm/slub.c:3208 [inline] kmem_cache_free+0x100/0x2d0 mm/slub.c:3224 kfree_skbmem+0x10c/0x180 net/core/skbuff.c:-1 __kfree_skb+0x58/0x70 net/core/skbuff.c:695 sk_wmem_free_skb include/net/sock.h:1623 [inline] tcp_rtx_queue_unlink_and_free+0x205/0x740 include/net/tcp.h:1890 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3367 [inline] tcp_ack+0x2198/0x5ec0 net/ipv4/tcp_input.c:3924 tcp_rcv_established+0x1145/0x1a00 net/ipv4/tcp_input.c:5966 tcp_v4_do_rcv+0x3e4/0x7c0 net/ipv4/tcp_ipv4.c:1699 tcp_v4_rcv+0x2295/0x2810 net/ipv4/tcp_ipv4.c:2095 ip_protocol_deliver_rcu+0x302/0x650 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip_local_deliver+0x2dd/0x530 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:461 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:558 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:609 [inline] ip_sublist_rcv+0x75b/0x8b0 net/ipv4/ip_input.c:617 ip_list_rcv+0x3e4/0x430 net/ipv4/ip_input.c:652 __netif_receive_skb_list_ptype net/core/dev.c:5457 [inline] __netif_receive_skb_list_core+0x57e/0x770 net/core/dev.c:5505 __netif_receive_skb_list net/core/dev.c:5557 [inline] netif_receive_skb_list_internal+0x7f8/0xaa0 net/core/dev.c:5667 gro_normal_list net/core/dev.c:5821 [inline] napi_complete_done+0x375/0x780 net/core/dev.c:6570 virtqueue_napi_complete drivers/net/virtio_net.c:357 [inline] virtnet_poll+0x963/0xfa0 drivers/net/virtio_net.c:1570 napi_poll net/core/dev.c:6886 [inline] net_rx_action+0x48d/0xed0 net/core/dev.c:6956 __do_softirq+0x255/0x563 kernel/softirq.c:309 The buggy address belongs to the object at ffff88812dd70280 which belongs to the cache skbuff_fclone_cache of size 504 The buggy address is located 496 bytes inside of 504-byte region [ffff88812dd70280, ffff88812dd70478) The buggy address belongs to the page: page:ffffea0004b75c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12dd70 head:ffffea0004b75c00 order:1 compound_mapcount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 ffffea00043cf700 0000000500000005 ffff888107d93c80 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x152a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 271, ts 153245338717, free_ts 153175002544 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x176/0x190 mm/page_alloc.c:2462 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1813 [inline] new_slab+0x84/0x3f0 mm/slub.c:1874 new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc+0x2f8/0x4c0 mm/slub.c:2796 __slab_alloc+0x63/0xa0 mm/slub.c:2836 slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] kmem_cache_alloc+0x1a4/0x2d0 mm/slub.c:2965 kmem_cache_alloc_node include/linux/slab.h:426 [inline] __alloc_skb+0x9e/0x520 net/core/skbuff.c:200 alloc_skb_fclone include/linux/skbuff.h:1176 [inline] sk_stream_alloc_skb+0x216/0xb70 net/ipv4/tcp.c:887 tso_fragment net/ipv4/tcp_output.c:2129 [inline] tcp_write_xmit+0x10ea/0x5c30 net/ipv4/tcp_output.c:2700 __tcp_push_pending_frames+0x99/0x2f0 net/ipv4/tcp_output.c:2895 tcp_push+0x46f/0x620 net/ipv4/tcp.c:736 tcp_sendmsg_locked+0x2cd0/0x34e0 net/ipv4/tcp.c:1417 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1447 inet_sendmsg+0xa5/0xc0 net/ipv4/af_inet.c:830 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] sock_write_iter+0x2a6/0x3a0 net/socket.c:1019 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_pcp_prepare mm/page_alloc.c:1421 [inline] free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336 free_unref_page_list+0x129/0x9c0 mm/page_alloc.c:3443 release_pages+0xe41/0xe90 mm/swap.c:1103 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:356 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:240 [inline] tlb_flush_mmu mm/mmu_gather.c:247 [inline] tlb_finish_mmu+0x17e/0x310 mm/mmu_gather.c:326 exit_mmap+0x329/0x590 mm/mmap.c:3387 __mmput+0x92/0x2d0 kernel/fork.c:1153 mmput+0x4e/0x150 kernel/fork.c:1176 exit_mm kernel/exit.c:546 [inline] do_exit+0x9d8/0x24e0 kernel/exit.c:866 do_group_exit+0x149/0x310 kernel/exit.c:993 get_signal+0xfb1/0x1300 kernel/signal.c:2806 arch_do_signal_or_restart+0xe7/0x11b0 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop+0xa2/0xe0 kernel/entry/common.c:172 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:202 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:277 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56 Memory state around the buggy address: ffff88812dd70300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88812dd70380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88812dd70400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc ^ ffff88812dd70480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88812dd70500: fa fb fb fb fb fb fb fb fb 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