================================================================== 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+0x6f1/0x760 mm/filemap.c:172 Read of size 4 at addr ffff888128c80470 by task syz.0.1218/4086 CPU: 0 PID: 4086 Comm: syz.0.1218 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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+0x10f/0x150 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+0x6f1/0x760 mm/filemap.c:172 __delete_from_page_cache+0xbe/0x470 mm/filemap.c:240 __remove_mapping+0x601/0x990 mm/vmscan.c:1216 shrink_page_list+0x2a24/0x5800 mm/vmscan.c:1829 shrink_inactive_list mm/vmscan.c:2338 [inline] shrink_list mm/vmscan.c:2583 [inline] shrink_lruvec+0x1297/0x3a40 mm/vmscan.c:5800 shrink_node_memcgs mm/vmscan.c:5992 [inline] shrink_node+0x11ee/0x2a40 mm/vmscan.c:6022 shrink_zones mm/vmscan.c:6228 [inline] do_try_to_free_pages+0x5a7/0x1580 mm/vmscan.c:6286 try_to_free_mem_cgroup_pages+0x261/0x610 mm/vmscan.c:6600 mem_cgroup_force_empty mm/memcontrol.c:3595 [inline] mem_cgroup_force_empty_write+0x130/0x170 mm/memcontrol.c:3616 cgroup_file_write+0x294/0x560 kernel/cgroup/cgroup.c:4011 kernfs_fop_write_iter+0x2bd/0x400 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2218 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x831/0xfd0 fs/read_write.c:594 ksys_write+0x14a/0x260 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:656 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 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: 0033:0x7ffa22748159 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:00007ffa211a1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ffa229cffa0 RCX: 00007ffa22748159 RDX: 0000000000000001 RSI: 00002000000002c0 RDI: 0000000000000003 RBP: 00007ffa227df06b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffa229d0038 R14: 00007ffa229cffa0 R15: 00007ffd725d0ba8 Allocated by task 140: 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+0xd4/0x100 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] __alloc_skb+0x210/0x730 net/core/skbuff.c:428 alloc_skb include/linux/skbuff.h:1183 [inline] nlmsg_new include/net/netlink.h:953 [inline] audit_buffer_alloc kernel/audit.c:1806 [inline] audit_log_start+0x407/0x8a0 kernel/audit.c:1924 common_lsm_audit+0xd2/0x1670 security/lsm_audit.c:457 slow_avc_audit+0x1c4/0x240 security/selinux/avc.c:802 avc_audit security/selinux/include/avc.h:135 [inline] avc_has_perm+0x1fb/0x250 security/selinux/avc.c:1190 sock_has_perm security/selinux/hooks.c:4701 [inline] selinux_socket_recvmsg+0x22f/0x340 security/selinux/hooks.c:5061 security_socket_recvmsg+0x77/0xb0 security/security.c:2260 sock_recvmsg net/socket.c:983 [inline] ____sys_recvmsg+0x223/0x5b0 net/socket.c:2655 ___sys_recvmsg+0x213/0x5c0 net/socket.c:2697 __sys_recvmsg net/socket.c:2727 [inline] __do_sys_recvmsg net/socket.c:2737 [inline] __se_sys_recvmsg net/socket.c:2734 [inline] __x64_sys_recvmsg+0x1fe/0x2d0 net/socket.c:2734 x64_sys_call+0x705/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:48 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 30: 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+0x7bd/0xa20 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 kauditd_hold_skb+0x116/0x210 kernel/audit.c:617 kauditd_send_queue+0x28c/0x2e0 kernel/audit.c:772 kauditd_thread+0x4ea/0x880 kernel/audit.c:896 kthread+0x3f5/0x4f0 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 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/0xf60 kernel/rcu/tree.c:3129 netlink_release+0x128f/0x16d0 net/netlink/af_netlink.c:799 __sock_release net/socket.c:649 [inline] sock_close+0xb8/0x200 net/socket.c:1336 __fput+0x22b/0x900 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 insert_work+0x51/0x310 kernel/workqueue.c:1373 __queue_work+0x8e1/0xc60 kernel/workqueue.c:1539 queue_work_on+0xde/0x150 kernel/workqueue.c:1566 queue_work include/linux/workqueue.h:510 [inline] schedule_work include/linux/workqueue.h:571 [inline] destroy_super_rcu+0xd1/0xe0 fs/super.c:172 rcu_do_batch+0x4c1/0xbf0 kernel/rcu/tree.c:2523 rcu_core+0x4a3/0xef0 kernel/rcu/tree.c:2763 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2776 handle_softirqs+0x250/0x560 kernel/softirq.c:583 __do_softirq kernel/softirq.c:621 [inline] invoke_softirq kernel/softirq.c:443 [inline] __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:670 irq_exit_rcu+0x9/0x10 kernel/softirq.c:682 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676 The buggy address belongs to the object at ffff888128c80000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1136 bytes inside of 2048-byte region [ffff888128c80000, ffff888128c80800) The buggy address belongs to the page: page:ffffea0004a32000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x128c80 head:ffffea0004a32000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 dead000000000100 dead000000000122 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 285, ts 24036172421, free_ts 0 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa0/0x4d0 mm/slub.c:2000 ___slab_alloc+0x3ac/0x840 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] ipv6_add_dev+0xd2/0x1150 net/ipv6/addrconf.c:386 ipv6_find_idev net/ipv6/addrconf.c:492 [inline] inet6_rtm_newaddr+0x49a/0x9c0 net/ipv6/addrconf.c:4966 rtnetlink_rcv_msg+0x9fd/0xcb0 net/core/rtnetlink.c:5662 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2520 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5680 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x86c/0xa30 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x879/0xb80 net/netlink/af_netlink.c:1923 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] __sys_sendto+0x46d/0x620 net/socket.c:2063 page_owner free stack trace missing Memory state around the buggy address: ffff888128c80300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888128c80380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888128c80400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888128c80480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888128c80500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== 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 285, ts 24036172421, free_ts 0 page_owner free stack trace missing