================================================================== 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 ffff88811355c470 by task syz.4.10313/31946 CPU: 0 PID: 31946 Comm: syz.4.10313 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 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_mem_cgroup_pages+0x261/0x610 mm/vmscan.c:6593 try_charge_memcg+0x3f8/0x14b0 mm/memcontrol.c:2713 try_charge mm/memcontrol.c:2838 [inline] charge_memcg+0x6d/0x1a0 mm/memcontrol.c:6861 __mem_cgroup_charge+0x93/0x280 mm/memcontrol.c:6898 mem_cgroup_charge include/linux/memcontrol.h:715 [inline] shmem_add_to_page_cache+0x64b/0xc50 mm/shmem.c:719 shmem_getpage_gfp+0x116a/0x2310 mm/shmem.c:1942 shmem_getpage mm/shmem.c:152 [inline] shmem_fallocate+0x882/0xd20 mm/shmem.c:2760 vfs_fallocate+0x4b4/0x590 fs/open.c:309 ksys_fallocate fs/open.c:332 [inline] __do_sys_fallocate fs/open.c:340 [inline] __se_sys_fallocate fs/open.c:338 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:338 x64_sys_call+0x7ec/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:286 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: 0033:0x7fd8b300edd9 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:00007fd8b1a48028 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fd8b3288090 RCX: 00007fd8b300edd9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 00007fd8b30a4d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008800000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd8b3288128 R14: 00007fd8b3288090 R15: 00007ffc93668ec8 Allocated by task 28819: 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_slab_alloc+0xbd/0xf0 mm/kasan/common.c:466 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] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260 getname_flags+0xb9/0x500 fs/namei.c:138 getname fs/namei.c:217 [inline] __do_sys_unlink fs/namei.c:4404 [inline] __se_sys_unlink fs/namei.c:4402 [inline] __x64_sys_unlink+0x3c/0x50 fs/namei.c:4402 x64_sys_call+0x878/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:88 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 28819: 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] kmem_cache_free+0x100/0x320 mm/slub.c:3544 putname fs/namei.c:271 [inline] do_unlinkat+0x638/0x6d0 fs/namei.c:4379 __do_sys_unlink fs/namei.c:4404 [inline] __se_sys_unlink fs/namei.c:4402 [inline] __x64_sys_unlink+0x49/0x50 fs/namei.c:4402 x64_sys_call+0x878/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:88 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 The buggy address belongs to the object at ffff88811355c400 which belongs to the cache names_cache of size 4096 The buggy address is located 112 bytes inside of 4096-byte region [ffff88811355c400, ffff88811355d400) The buggy address belongs to the page: page:ffffea00044d5600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113558 head:ffffea00044d5600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff8881001c4000 raw: 0000000000000000 0000000000070007 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 101, ts 1254929190958, free_ts 1254924907125 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:5822 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 getname_flags+0xb9/0x500 fs/namei.c:138 getname+0x19/0x20 fs/namei.c:217 do_sys_openat2+0xeb/0x7f0 fs/open.c:1230 do_sys_open fs/open.c:1252 [inline] __do_sys_openat fs/open.c:1268 [inline] __se_sys_openat fs/open.c:1263 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1263 x64_sys_call+0x219/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258 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 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_pages+0x6c/0x100 mm/page_alloc.c:5898 __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] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260 getname_flags+0xb9/0x500 fs/namei.c:138 user_path_at_empty+0x30/0x1c0 fs/namei.c:2890 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x109/0xa20 fs/stat.c:221 Memory state around the buggy address: ffff88811355c300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811355c380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88811355c400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811355c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811355c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================