================================================================== BUG: KASAN: slab-out-of-bounds in cleancache_fs_enabled_mapping include/linux/cleancache.h:54 [inline] BUG: KASAN: slab-out-of-bounds in cleancache_invalidate_page include/linux/cleancache.h:108 [inline] BUG: KASAN: slab-out-of-bounds in unaccount_page_cache_page+0x6e6/0x750 mm/filemap.c:169 Read of size 4 at addr ffff8881eb9ad488 by task syz-executor.1/22522 CPU: 0 PID: 22522 Comm: syz-executor.1 Tainted: G W 5.4.233-syzkaller-00004-gdd94985a9b62 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 print_address_description+0x8c/0x600 mm/kasan/report.c:384 __kasan_report+0xf3/0x120 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 cleancache_fs_enabled_mapping include/linux/cleancache.h:54 [inline] cleancache_invalidate_page include/linux/cleancache.h:108 [inline] unaccount_page_cache_page+0x6e6/0x750 mm/filemap.c:169 __delete_from_page_cache+0xd0/0x600 mm/filemap.c:237 __remove_mapping+0x4a2/0x590 mm/vmscan.c:978 shrink_page_list+0x22f9/0x42c0 mm/vmscan.c:1482 shrink_inactive_list+0x533/0xfe0 mm/vmscan.c:2001 shrink_list mm/vmscan.c:2293 [inline] shrink_node_memcg+0xc42/0x2430 mm/vmscan.c:2623 shrink_node+0x389/0x14a0 mm/vmscan.c:2836 shrink_zones mm/vmscan.c:3053 [inline] do_try_to_free_pages+0x63f/0x12b0 mm/vmscan.c:3111 try_to_free_mem_cgroup_pages+0x3f6/0x9b0 mm/vmscan.c:3412 memory_high_write+0x176/0x260 mm/memcontrol.c:6173 cgroup_file_write+0x275/0x5f0 kernel/cgroup/cgroup.c:3898 kernfs_fop_write+0x2e2/0x3e0 fs/kernfs/file.c:315 __vfs_write+0x103/0x750 fs/read_write.c:494 vfs_write+0x206/0x4e0 fs/read_write.c:558 ksys_write+0x199/0x2c0 fs/read_write.c:611 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Allocated by task 162: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842 getname_flags+0xb8/0x4e0 fs/namei.c:141 user_path_at_empty+0x28/0x50 fs/namei.c:2683 do_readlinkat+0x114/0x3a0 fs/stat.c:398 __do_sys_readlink fs/stat.c:431 [inline] __se_sys_readlink fs/stat.c:428 [inline] __x64_sys_readlink+0x7b/0x90 fs/stat.c:428 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 162: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x1b5/0x270 mm/kasan/common.c:487 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook mm/slub.c:1494 [inline] slab_free mm/slub.c:3080 [inline] kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096 putname fs/namei.c:262 [inline] filename_lookup+0x50e/0x6e0 fs/namei.c:2432 do_readlinkat+0x114/0x3a0 fs/stat.c:398 __do_sys_readlink fs/stat.c:431 [inline] __se_sys_readlink fs/stat.c:428 [inline] __x64_sys_readlink+0x7b/0x90 fs/stat.c:428 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 The buggy address belongs to the object at ffff8881eb9ac400 which belongs to the cache names_cache of size 4096 The buggy address is located 136 bytes to the right of 4096-byte region [ffff8881eb9ac400, ffff8881eb9ad400) The buggy address belongs to the page: page:ffffea0007ae6a00 refcount:1 mapcount:0 mapping:ffff8881f5cfc500 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 0000000000000000 0000000100000001 ffff8881f5cfc500 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) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x18f/0x370 mm/page_alloc.c:2171 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4891 alloc_slab_page+0x39/0x3c0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x97/0x440 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x2fe/0x490 mm/slub.c:2667 __slab_alloc+0x62/0xa0 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0x109/0x250 mm/slub.c:2842 getname_flags+0xb8/0x4e0 fs/namei.c:141 do_sys_open+0x357/0x810 fs/open.c:1107 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] __free_pages_ok+0x847/0x950 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4953 [inline] __free_pages+0x91/0x140 mm/page_alloc.c:4959 __free_slab+0x221/0x2e0 mm/slub.c:1774 free_slab mm/slub.c:1789 [inline] discard_slab mm/slub.c:1795 [inline] unfreeze_partials+0x14e/0x180 mm/slub.c:2288 put_cpu_partial+0x44/0x180 mm/slub.c:2324 __slab_free+0x297/0x360 mm/slub.c:2971 qlist_free_all+0x43/0xb0 mm/kasan/quarantine.c:167 quarantine_reduce+0x1d9/0x210 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x41/0x210 mm/kasan/common.c:507 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842 kmem_cache_zalloc include/linux/slab.h:680 [inline] taskstats_tgid_alloc kernel/taskstats.c:565 [inline] taskstats_exit+0xf2/0xbb0 kernel/taskstats.c:604 do_exit+0x65e/0x2bc0 kernel/exit.c:844 do_group_exit+0x138/0x300 kernel/exit.c:982 get_signal+0xdb1/0x1440 kernel/signal.c:2735 do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159 Memory state around the buggy address: ffff8881eb9ad380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881eb9ad400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881eb9ad480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881eb9ad500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881eb9ad580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================