================================================================== 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 ffff888125f90470 by task syz.6.2807/10687 CPU: 0 PID: 10687 Comm: syz.6.2807 Tainted: G W 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 try_charge+0x426/0x1580 mm/memcontrol.c:2749 __mem_cgroup_charge+0x148/0x6d0 mm/memcontrol.c:6881 mem_cgroup_charge include/linux/memcontrol.h:458 [inline] shmem_add_to_page_cache+0x569/0xe10 mm/shmem.c:699 shmem_getpage_gfp+0x907/0x20f0 mm/shmem.c:1952 shmem_getpage mm/shmem.c:161 [inline] shmem_write_begin+0xce/0x1b0 mm/shmem.c:2497 generic_perform_write+0x2ce/0x540 mm/filemap.c:3509 __generic_file_write_iter+0x24b/0x480 mm/filemap.c:3638 generic_file_write_iter+0xa9/0x1d0 mm/filemap.c:3670 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: 0033:0x7fd09e70ab19 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:00007fd09d162028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fd09e990fa0 RCX: 00007fd09e70ab19 RDX: 00000000ffffffe8 RSI: 0000200000006b80 RDI: 0000000000000003 RBP: 00007fd09e7a2b70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd09e991038 R14: 00007fd09e990fa0 R15: 00007fff0fa003d8 Allocated by task 10331: 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_kmalloc mm/kasan/common.c:509 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] kmem_cache_alloc_trace+0x179/0x2e0 mm/slub.c:2979 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:667 [inline] copy_verifier_state+0x711/0xc20 kernel/bpf/verifier.c:913 push_stack+0x19b/0x4f0 kernel/bpf/verifier.c:989 check_cond_jmp_op kernel/bpf/verifier.c:8305 [inline] do_check+0xbcd4/0xe3b0 kernel/bpf/verifier.c:10353 do_check_common+0x94e/0x1190 kernel/bpf/verifier.c:12087 do_check_main kernel/bpf/verifier.c:12150 [inline] bpf_check+0x97e4/0xdcd0 kernel/bpf/verifier.c:12717 bpf_prog_load+0x1004/0x14e0 kernel/bpf/syscall.c:2234 __do_sys_bpf kernel/bpf/syscall.c:4435 [inline] __se_sys_bpf+0x49a/0x740 kernel/bpf/syscall.c:4391 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:4391 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 10331: 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] kfree+0xc0/0x270 mm/slub.c:4196 free_func_state kernel/bpf/verifier.c:839 [inline] free_verifier_state+0xf1/0x250 kernel/bpf/verifier.c:855 pop_stack+0x393/0x510 kernel/bpf/verifier.c:964 do_check+0x87e5/0xe3b0 kernel/bpf/verifier.c:10342 do_check_common+0x94e/0x1190 kernel/bpf/verifier.c:12087 do_check_main kernel/bpf/verifier.c:12150 [inline] bpf_check+0x97e4/0xdcd0 kernel/bpf/verifier.c:12717 bpf_prog_load+0x1004/0x14e0 kernel/bpf/syscall.c:2234 __do_sys_bpf kernel/bpf/syscall.c:4435 [inline] __se_sys_bpf+0x49a/0x740 kernel/bpf/syscall.c:4391 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:4391 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb 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 kernel/rcu/tree.c:2980 [inline] call_rcu+0x11a/0x1090 kernel/rcu/tree.c:3054 netlink_release+0x128f/0x16d0 net/netlink/af_netlink.c:795 __sock_release net/socket.c:597 [inline] sock_close+0xb8/0x200 net/socket.c:1287 __fput+0x2dc/0x730 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x127/0x190 kernel/task_work.c:189 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xa7c/0x24e0 kernel/exit.c:879 do_group_exit+0x149/0x310 kernel/exit.c:993 __do_sys_exit_group kernel/exit.c:1004 [inline] __se_sys_exit_group kernel/exit.c:1002 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1002 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb 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 __call_rcu kernel/rcu/tree.c:2980 [inline] call_rcu+0x11a/0x1090 kernel/rcu/tree.c:3054 netlink_release+0x128f/0x16d0 net/netlink/af_netlink.c:795 __sock_release net/socket.c:597 [inline] sock_close+0xb8/0x200 net/socket.c:1287 __fput+0x2dc/0x730 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x127/0x190 kernel/task_work.c:189 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xa7c/0x24e0 kernel/exit.c:879 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 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888125f90000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1136 bytes inside of 2048-byte region [ffff888125f90000, ffff888125f90800) The buggy address belongs to the page: page:ffffea000497e400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x125f90 head:ffffea000497e400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042d80 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 281, ts 23190986595, free_ts 0 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] __kmalloc_track_caller+0x1e4/0x310 mm/slub.c:4541 __kmalloc_reserve net/core/skbuff.c:144 [inline] __alloc_skb+0xdc/0x520 net/core/skbuff.c:212 alloc_skb include/linux/skbuff.h:1126 [inline] nlmsg_new include/net/netlink.h:953 [inline] rtmsg_ifinfo_build_skb+0x75/0x180 net/core/rtnetlink.c:3856 rtmsg_ifinfo_event net/core/rtnetlink.c:3892 [inline] rtmsg_ifinfo+0x7a/0x130 net/core/rtnetlink.c:3901 register_netdevice+0x10fb/0x13a0 net/core/dev.c:10113 __ip_tunnel_create+0x2c7/0x390 net/ipv4/ip_tunnel.c:267 ip_tunnel_init_net+0x2be/0x730 net/ipv4/ip_tunnel.c:1069 ipip_init_net+0x29/0x30 net/ipv4/ipip.c:614 ops_init+0x2c0/0x470 net/core/net_namespace.c:144 setup_net+0x34f/0xae0 net/core/net_namespace.c:345 page_owner free stack trace missing Memory state around the buggy address: ffff888125f90300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888125f90380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888125f90400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888125f90480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888125f90500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================