================================================================== 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 ffff88811c016470 by task syz.8.1175/4169 CPU: 1 PID: 4169 Comm: syz.8.1175 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 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/0x470 mm/filemap.c:240 __remove_mapping+0x80a/0x980 mm/vmscan.c:1216 shrink_page_list+0x24fc/0x5540 mm/vmscan.c:1824 shrink_inactive_list mm/vmscan.c:2331 [inline] shrink_list mm/vmscan.c:2576 [inline] shrink_lruvec+0x1209/0x39a0 mm/vmscan.c:5793 shrink_node_memcgs mm/vmscan.c:5985 [inline] shrink_node+0x1205/0x2aa0 mm/vmscan.c:6015 shrink_zones mm/vmscan.c:6221 [inline] do_try_to_free_pages+0x5a8/0x1580 mm/vmscan.c:6279 try_to_free_pages+0x4e6/0xc40 mm/vmscan.c:6514 __perform_reclaim mm/page_alloc.c:4955 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4978 [inline] __alloc_pages_slowpath+0x143e/0x30a0 mm/page_alloc.c:5424 __alloc_pages+0x338/0x460 mm/page_alloc.c:5821 __alloc_pages_node include/linux/gfp.h:595 [inline] alloc_pages_node include/linux/gfp.h:609 [inline] alloc_pages include/linux/gfp.h:622 [inline] do_anonymous_page mm/memory.c:4069 [inline] handle_pte_fault+0xebf/0x2710 mm/memory.c:4909 __handle_mm_fault mm/memory.c:-1 [inline] do_handle_mm_fault+0x1af9/0x1de0 mm/memory.c:5333 handle_mm_fault include/linux/mm.h:1847 [inline] faultin_page mm/gup.c:976 [inline] __get_user_pages+0x80e/0x10c0 mm/gup.c:1197 populate_vma_page_range mm/gup.c:1529 [inline] __mm_populate+0x324/0x470 mm/gup.c:1638 mm_populate include/linux/mm.h:2704 [inline] __do_sys_mremap mm/mremap.c:1116 [inline] __se_sys_mremap+0x85c/0x1130 mm/mremap.c:965 __x64_sys_mremap+0xbf/0xd0 mm/mremap.c:965 x64_sys_call+0x315/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:26 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 RIP: 0033:0x7f17694e3799 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:00007f1767f3e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000019 RAX: ffffffffffffffda RBX: 00007f176975cfa0 RCX: 00007f17694e3799 RDX: 0000000005000000 RSI: 0000000000002000 RDI: 0000200000ff5000 RBP: 00007f1769579bd9 R08: 0000200000ffd000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f176975d038 R14: 00007f176975cfa0 R15: 00007ffeb43fcaa8 Allocated by task 4039: 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 kmemdup+0x26/0x60 mm/util.c:132 neigh_sysctl_register+0xbe/0xa90 net/core/neighbour.c:3652 devinet_sysctl_register+0xaf/0x1e0 net/ipv4/devinet.c:2641 inetdev_init+0x2b9/0x500 net/ipv4/devinet.c:284 inetdev_event+0x1f7/0x10a0 net/ipv4/devinet.c:1544 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:2070 [inline] call_netdevice_notifiers_extack net/core/dev.c:2082 [inline] call_netdevice_notifiers+0x119/0x190 net/core/dev.c:2096 register_netdevice+0x10e5/0x1460 net/core/dev.c:10449 br_dev_newlink+0x27/0x110 net/bridge/br_netlink.c:1443 __rtnl_newlink net/core/rtnetlink.c:3524 [inline] rtnl_newlink+0x133a/0x1a30 net/core/rtnetlink.c:3572 rtnetlink_rcv_msg+0xa4b/0xce0 net/core/rtnetlink.c:5650 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2511 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5668 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1348 netlink_sendmsg+0x879/0xb80 net/netlink/af_netlink.c:1922 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2435 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2489 __sys_sendmsg net/socket.c:2518 [inline] __do_sys_sendmsg net/socket.c:2527 [inline] __se_sys_sendmsg net/socket.c:2525 [inline] __x64_sys_sendmsg+0x206/0x2f0 net/socket.c:2525 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 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 4039: 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 neigh_sysctl_unregister+0x80/0x90 net/core/neighbour.c:3738 devinet_sysctl_unregister net/ipv4/devinet.c:2656 [inline] inetdev_destroy net/ipv4/devinet.c:327 [inline] inetdev_event+0x808/0x10a0 net/ipv4/devinet.c:1612 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:2070 [inline] call_netdevice_notifiers_extack net/core/dev.c:2082 [inline] call_netdevice_notifiers net/core/dev.c:2096 [inline] unregister_netdevice_many+0x10a1/0x1aa0 net/core/dev.c:11163 unregister_netdevice_queue+0x324/0x370 net/core/dev.c:11096 br_dev_delete+0xfc/0x110 net/bridge/br_if.c:387 br_dev_newlink+0xef/0x110 net/bridge/br_netlink.c:1455 __rtnl_newlink net/core/rtnetlink.c:3524 [inline] rtnl_newlink+0x133a/0x1a30 net/core/rtnetlink.c:3572 rtnetlink_rcv_msg+0xa4b/0xce0 net/core/rtnetlink.c:5650 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2511 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5668 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1348 netlink_sendmsg+0x879/0xb80 net/netlink/af_netlink.c:1922 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2435 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2489 __sys_sendmsg net/socket.c:2518 [inline] __do_sys_sendmsg net/socket.c:2527 [inline] __se_sys_sendmsg net/socket.c:2525 [inline] __x64_sys_sendmsg+0x206/0x2f0 net/socket.c:2525 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 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+0x10b/0xf80 kernel/rcu/tree.c:3129 netlink_release+0x12ea/0x1710 net/netlink/af_netlink.c:803 __sock_release net/socket.c:649 [inline] sock_close+0xe0/0x270 net/socket.c:1335 __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 __call_rcu_common kernel/rcu/tree.c:3011 [inline] call_rcu+0x10b/0xf80 kernel/rcu/tree.c:3129 netlink_release+0x12ea/0x1710 net/netlink/af_netlink.c:803 __sock_release net/socket.c:649 [inline] sock_close+0xe0/0x270 net/socket.c:1335 __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 The buggy address belongs to the object at ffff88811c016000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1136 bytes inside of 2048-byte region [ffff88811c016000, ffff88811c016800) The buggy address belongs to the page: page:ffffea0004700400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11c010 head:ffffea0004700400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 0000000600000001 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 273, ts 25701582505, free_ts 18485466129 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+0x2d3a/0x2dc0 mm/page_alloc.c:4485 __alloc_pages+0x1a2/0x460 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] kmem_cache_alloc_trace+0x146/0x270 mm/slub.c:3272 kmalloc include/linux/slab.h:619 [inline] kzalloc include/linux/slab.h:750 [inline] alloc_super+0x5e/0x7f0 fs/super.c:203 sget_fc+0x2e3/0x750 fs/super.c:554 kernfs_get_tree+0x191/0x790 fs/kernfs/mount.c:332 cgroup_do_get_tree+0xf8/0x550 kernel/cgroup/cgroup.c:2144 cgroup1_get_tree+0x9df/0xc70 kernel/cgroup/cgroup-v1.c:1250 vfs_get_tree+0x89/0x260 fs/super.c:1530 do_new_mount+0x25a/0xa20 fs/namespace.c:3034 path_mount+0x659/0xff0 fs/namespace.c:3364 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+0xae/0x540 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] free_compound_page+0x78/0xa0 mm/page_alloc.c:828 destroy_compound_page include/linux/mm.h:1000 [inline] __put_compound_page+0x77/0xb0 mm/swap.c:111 __put_page+0xbc/0xe0 mm/swap.c:127 put_page include/linux/mm.h:1306 [inline] __skb_frag_unref include/linux/skbuff.h:3275 [inline] skb_release_data+0x3d3/0xa10 net/core/skbuff.c:673 skb_release_all net/core/skbuff.c:743 [inline] __kfree_skb+0x50/0x70 net/core/skbuff.c:757 sk_eat_skb include/net/sock.h:2799 [inline] tcp_recvmsg_locked+0x14cd/0x26f0 net/ipv4/tcp.c:2517 tcp_recvmsg+0x23c/0x770 net/ipv4/tcp.c:2563 inet_recvmsg+0x13a/0x480 net/ipv4/af_inet.c:861 sock_recvmsg_nosec net/socket.c:966 [inline] sock_recvmsg net/socket.c:984 [inline] sock_read_iter+0x2b8/0x380 net/socket.c:1057 call_read_iter include/linux/fs.h:2206 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0x6c9/0xc40 fs/read_write.c:485 ksys_read+0x149/0x250 fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __x64_sys_read+0x7b/0x90 fs/read_write.c:631 x64_sys_call+0x96d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 Memory state around the buggy address: ffff88811c016300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811c016380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811c016400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811c016480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811c016500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================