================================================================== 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 ffff888116643470 by task ext4lazyinit/20261 CPU: 0 PID: 20261 Comm: ext4lazyinit Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 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/0x420 mm/filemap.c:240 __remove_mapping+0x60b/0x930 mm/vmscan.c:1216 shrink_page_list+0x2778/0x5040 mm/vmscan.c:1824 shrink_inactive_list mm/vmscan.c:2331 [inline] shrink_list mm/vmscan.c:2576 [inline] shrink_lruvec+0x10f3/0x36a0 mm/vmscan.c:5793 shrink_node_memcgs mm/vmscan.c:5985 [inline] shrink_node+0x11e9/0x2a70 mm/vmscan.c:6015 shrink_zones mm/vmscan.c:6221 [inline] do_try_to_free_pages+0x57e/0x1550 mm/vmscan.c:6279 try_to_free_pages+0x4b3/0xba0 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+0x1330/0x2e30 mm/page_alloc.c:5424 __alloc_pages+0x31c/0x440 mm/page_alloc.c:5821 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+0x138/0x260 mm/slub.c:3260 mempool_alloc_slab+0x1d/0x30 mm/mempool.c:513 mempool_alloc+0x384/0x4a0 mm/mempool.c:393 bio_alloc_bioset+0x136/0x940 block/bio.c:469 bio_alloc include/linux/bio.h:429 [inline] submit_bh_wbc+0x1c6/0x670 fs/buffer.c:3028 submit_bh+0x2a/0x40 fs/buffer.c:3062 __ext4_read_bh fs/ext4/super.c:155 [inline] ext4_read_bh_nowait+0x18d/0x1c0 fs/ext4/super.c:167 ext4_read_block_bitmap_nowait+0x707/0x980 fs/ext4/balloc.c:542 ext4_mb_prefetch+0x440/0x630 fs/ext4/mballoc.c:2626 ext4_run_li_request fs/ext4/super.c:3278 [inline] ext4_lazyinit_thread+0x4df/0x1560 fs/ext4/super.c:3404 kthread+0x411/0x500 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Allocated by task 20087: 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] kmem_cache_alloc_trace+0x119/0x270 mm/slub.c:3274 kmalloc include/linux/slab.h:619 [inline] kzalloc include/linux/slab.h:750 [inline] io_ring_ctx_alloc io_uring/io_uring.c:1296 [inline] io_uring_create io_uring/io_uring.c:10396 [inline] io_uring_setup io_uring/io_uring.c:10502 [inline] __do_sys_io_uring_setup io_uring/io_uring.c:10508 [inline] __se_sys_io_uring_setup+0x2c1/0x29a0 io_uring/io_uring.c:10505 __x64_sys_io_uring_setup+0x5b/0x70 io_uring/io_uring.c:10505 x64_sys_call+0x5f4/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:426 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 insert_work+0x51/0x310 kernel/workqueue.c:1373 __queue_work+0x8e5/0xc60 kernel/workqueue.c:1539 queue_work_on+0xd2/0x140 kernel/workqueue.c:1566 queue_work include/linux/workqueue.h:510 [inline] io_ring_ctx_wait_and_kill+0x2bf/0x310 io_uring/io_uring.c:9634 io_uring_create io_uring/io_uring.c:10475 [inline] io_uring_setup io_uring/io_uring.c:10502 [inline] __do_sys_io_uring_setup io_uring/io_uring.c:10508 [inline] __se_sys_io_uring_setup+0x22bd/0x29a0 io_uring/io_uring.c:10505 __x64_sys_io_uring_setup+0x5b/0x70 io_uring/io_uring.c:10505 x64_sys_call+0x5f4/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:426 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 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+0x105/0xfe0 kernel/rcu/tree.c:3129 netlink_release+0x1288/0x1690 net/netlink/af_netlink.c:803 __sock_release net/socket.c:649 [inline] sock_close+0xe0/0x270 net/socket.c:1336 __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 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xa7e/0x27a0 kernel/exit.c:889 do_group_exit+0x141/0x310 kernel/exit.c:1003 get_signal+0x66a/0x1480 kernel/signal.c:2907 arch_do_signal_or_restart+0xc1/0x10f0 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0xa7/0xe0 kernel/entry/common.c:178 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 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:280 The buggy address belongs to the object at ffff888116643000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1136 bytes inside of 2048-byte region [ffff888116643000, ffff888116643800) The buggy address belongs to the page: page:ffffea0004599000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888116643000 pfn:0x116640 head:ffffea0004599000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea000418ee08 ffffea0004437008 ffff888100043200 raw: ffff888116643000 0000000000080003 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 366, ts 31148280436, free_ts 31040092336 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+0x2cc5/0x2d50 mm/page_alloc.c:4485 __alloc_pages+0x18f/0x440 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] __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0x21a/0x740 net/core/skbuff.c:428 alloc_skb include/linux/skbuff.h:1183 [inline] mld_newpack+0x13a/0x9d0 net/ipv6/mcast.c:1745 add_grhead+0x5e/0x290 net/ipv6/mcast.c:1856 add_grec+0xd41/0x1100 net/ipv6/mcast.c:1994 mld_send_initial_cr net/ipv6/mcast.c:2241 [inline] mld_dad_work+0x209/0x660 net/ipv6/mcast.c:2267 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472 kthread+0x411/0x500 kernel/kthread.c:337 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+0xa2/0x550 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5884 __free_slab+0xe8/0x1e0 mm/slub.c:2025 free_slab mm/slub.c:2040 [inline] discard_slab+0x29/0x40 mm/slub.c:2046 __slab_free+0x211/0x290 mm/slub.c:3431 do_slab_free mm/slub.c:3514 [inline] ___cache_free+0x104/0x120 mm/slub.c:3535 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xf0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3245 [inline] slab_alloc mm/slub.c:3255 [inline] __kmalloc+0x120/0x2c0 mm/slub.c:4432 __kmalloc_node include/linux/slab.h:487 [inline] kmalloc_node include/linux/slab.h:642 [inline] kvmalloc_node+0x206/0x300 mm/util.c:621 kvmalloc include/linux/mm.h:862 [inline] vmemdup_user+0x26/0xe0 mm/util.c:203 setxattr_copy fs/xattr.c:564 [inline] setxattr+0x1e6/0x300 fs/xattr.c:607 Memory state around the buggy address: ffff888116643300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888116643380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888116643400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888116643480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888116643500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================