================================================================== 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:167 Read of size 4 at addr ffff88811431c470 by task syz.8.4507/16125 CPU: 0 PID: 16125 Comm: syz.8.4507 Tainted: G W 5.15.185-syzkaller-00339-ge678c93d43cc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 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:167 __delete_from_page_cache+0xbe/0x420 mm/filemap.c:235 __remove_mapping+0x55d/0x680 mm/vmscan.c:1208 shrink_page_list+0x25c8/0x4cc0 mm/vmscan.c:1805 shrink_inactive_list mm/vmscan.c:2312 [inline] shrink_list mm/vmscan.c:2557 [inline] shrink_lruvec+0x10e4/0x3760 mm/vmscan.c:5762 shrink_node_memcgs mm/vmscan.c:5954 [inline] shrink_node+0x11e9/0x2a70 mm/vmscan.c:5984 shrink_zones mm/vmscan.c:6190 [inline] do_try_to_free_pages+0x57e/0x1550 mm/vmscan.c:6248 try_to_free_pages+0x4b3/0xba0 mm/vmscan.c:6483 __perform_reclaim mm/page_alloc.c:4949 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4972 [inline] __alloc_pages_slowpath+0x1221/0x2cc0 mm/page_alloc.c:5405 __alloc_pages+0x31c/0x440 mm/page_alloc.c:5802 __alloc_pages_node include/linux/gfp.h:591 [inline] alloc_pages_node include/linux/gfp.h:605 [inline] alloc_pages include/linux/gfp.h:618 [inline] __get_free_pages+0x10/0x30 mm/page_alloc.c:5826 io_mem_alloc io_uring/io_uring.c:8875 [inline] io_allocate_scq_urings io_uring/io_uring.c:10296 [inline] io_uring_create io_uring/io_uring.c:10412 [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+0xfa7/0x29a0 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 RIP: 0033:0x7fb66c2d7929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb66a8fdfc8 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 00007fb66c4ff160 RCX: 00007fb66c2d7929 RDX: 0000000000000000 RSI: 0000200000000340 RDI: 0000000000000111 RBP: 0000200000000340 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000111 R15: 0000000000000000 Allocated by task 15681: 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:3240 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3255 getname_flags+0xb9/0x500 fs/namei.c:138 getname+0x19/0x20 fs/namei.c:217 do_sys_openat2+0xd9/0x7b0 fs/open.c:1228 do_sys_open fs/open.c:1250 [inline] __do_sys_openat fs/open.c:1266 [inline] __se_sys_openat fs/open.c:1261 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1261 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 Freed by task 15681: 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:1723 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1749 slab_free mm/slub.c:3521 [inline] kmem_cache_free+0x100/0x320 mm/slub.c:3539 putname+0x111/0x160 fs/namei.c:271 do_sys_openat2+0x6a7/0x7b0 fs/open.c:1243 do_sys_open fs/open.c:1250 [inline] __do_sys_openat fs/open.c:1266 [inline] __se_sys_openat fs/open.c:1261 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1261 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 The buggy address belongs to the object at ffff88811431c400 which belongs to the cache names_cache of size 4096 The buggy address is located 112 bytes inside of 4096-byte region [ffff88811431c400, ffff88811431d400) The buggy address belongs to the page: page:ffffea000450c600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x114318 head:ffffea000450c600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff8881001c4c00 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 15681, ts 1128674677660, free_ts 1124117791831 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:5789 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1932 [inline] new_slab+0xa1/0x4d0 mm/slub.c:1995 ___slab_alloc+0x381/0x810 mm/slub.c:3028 __slab_alloc+0x49/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc+0x138/0x260 mm/slub.c:3255 getname_flags+0xb9/0x500 fs/namei.c:138 getname+0x19/0x20 fs/namei.c:217 do_sys_openat2+0xd9/0x7b0 fs/open.c:1228 do_sys_open fs/open.c:1250 [inline] __do_sys_openat fs/open.c:1266 [inline] __se_sys_openat fs/open.c:1261 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1261 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+0xa2/0x550 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5865 __free_slab+0xe8/0x1e0 mm/slub.c:2020 free_slab mm/slub.c:2035 [inline] discard_slab mm/slub.c:2041 [inline] __unfreeze_partials+0x160/0x190 mm/slub.c:2527 put_cpu_partial+0xc6/0x120 mm/slub.c:2607 __slab_free+0x1d4/0x290 mm/slub.c:3390 do_slab_free mm/slub.c:3509 [inline] ___cache_free+0x104/0x120 mm/slub.c:3530 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:3240 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3255 kmem_cache_zalloc include/linux/slab.h:737 [inline] lsm_inode_alloc security/security.c:595 [inline] security_inode_alloc+0x33/0x110 security/security.c:1033 inode_init_always+0x711/0x990 fs/inode.c:232 Memory state around the buggy address: ffff88811431c300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811431c380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88811431c400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811431c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811431c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================