================================================================== 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+0x6d8/0x750 mm/filemap.c:167 Read of size 4 at addr ffff88811b8d8470 by task kworker/u4:19/2339 CPU: 1 PID: 2339 Comm: kworker/u4:19 Not tainted 5.15.176-syzkaller-00972-g829d9f138569 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: writeback wb_workfn (flush-8:0) Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x179/0x1c0 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+0x6d8/0x750 mm/filemap.c:167 __delete_from_page_cache+0xc6/0x5b0 mm/filemap.c:235 __remove_mapping+0x566/0x690 mm/vmscan.c:1208 shrink_page_list+0x2723/0x5c50 mm/vmscan.c:1805 shrink_inactive_list mm/vmscan.c:2312 [inline] shrink_list mm/vmscan.c:2557 [inline] shrink_lruvec+0x17ec/0x4580 mm/vmscan.c:5762 shrink_node_memcgs mm/vmscan.c:5954 [inline] shrink_node+0x1083/0x2550 mm/vmscan.c:5984 shrink_zones mm/vmscan.c:6190 [inline] do_try_to_free_pages+0x5c6/0x1600 mm/vmscan.c:6248 try_to_free_pages+0x3a5/0xd70 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+0x15fe/0x38e0 mm/page_alloc.c:5396 __alloc_pages+0x503/0x8f0 mm/page_alloc.c:5793 allocate_slab mm/slub.c:1932 [inline] new_slab+0x9a/0x4e0 mm/slub.c:1995 ___slab_alloc+0x39e/0x830 mm/slub.c:3028 __slab_alloc+0x4a/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc+0x139/0x250 mm/slub.c:3255 mempool_alloc_slab+0x1d/0x30 mm/mempool.c:513 mempool_alloc+0x3f3/0x550 mm/mempool.c:393 bio_alloc_bioset+0x12a/0x950 block/bio.c:469 bio_alloc include/linux/bio.h:429 [inline] io_submit_init_bio fs/ext4/page-io.c:403 [inline] io_submit_add_bh fs/ext4/page-io.c:428 [inline] ext4_bio_write_page+0x1295/0x1b80 fs/ext4/page-io.c:564 mpage_submit_page+0x18e/0x230 fs/ext4/inode.c:2125 mpage_process_page_bufs+0x6d2/0x8c0 fs/ext4/inode.c:2239 mpage_prepare_extent_to_map+0xa27/0xdd0 fs/ext4/inode.c:2667 ext4_writepages+0xde7/0x4000 fs/ext4/inode.c:2795 do_writepages+0x40e/0x670 mm/page-writeback.c:2388 __writeback_single_inode+0xdf/0xa70 fs/fs-writeback.c:1647 writeback_sb_inodes+0xb2a/0x1920 fs/fs-writeback.c:1930 __writeback_inodes_wb+0x118/0x3f0 fs/fs-writeback.c:2001 wb_writeback+0x3cd/0x9e0 fs/fs-writeback.c:2106 wb_check_old_data_flush fs/fs-writeback.c:2206 [inline] wb_do_writeback fs/fs-writeback.c:2259 [inline] wb_workfn+0xb3d/0x1110 fs/fs-writeback.c:2288 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2325 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2472 kthread+0x421/0x510 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Allocated by task 9067: 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+0xdb/0x110 mm/kasan/common.c:512 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] kmem_cache_alloc_trace+0x11a/0x270 mm/slub.c:3269 kmalloc include/linux/slab.h:603 [inline] audit_log_d_path+0xbd/0x2e0 kernel/audit.c:2153 audit_log_d_path_exe+0x42/0x70 kernel/audit.c:2224 audit_log_task+0x20d/0x2e0 kernel/auditsc.c:2682 audit_seccomp+0x7a/0x1e0 kernel/auditsc.c:2729 seccomp_log kernel/seccomp.c:988 [inline] __seccomp_filter+0xc08/0x1c60 kernel/seccomp.c:1254 __secure_computing+0xf0/0x300 kernel/seccomp.c:1316 syscall_trace_enter kernel/entry/common.c:68 [inline] __syscall_enter_from_user_work kernel/entry/common.c:96 [inline] syscall_enter_from_user_mode+0xd5/0x1b0 kernel/entry/common.c:114 do_syscall_64+0x1e/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 9067: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x126/0x160 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+0xbd/0x190 mm/slub.c:1749 slab_free mm/slub.c:3521 [inline] kfree+0xcc/0x270 mm/slub.c:4583 audit_log_d_path+0x270/0x2e0 kernel/audit.c:2164 audit_log_d_path_exe+0x42/0x70 kernel/audit.c:2224 audit_log_task+0x20d/0x2e0 kernel/auditsc.c:2682 audit_seccomp+0x7a/0x1e0 kernel/auditsc.c:2729 seccomp_log kernel/seccomp.c:988 [inline] __seccomp_filter+0xc08/0x1c60 kernel/seccomp.c:1254 __secure_computing+0xf0/0x300 kernel/seccomp.c:1316 syscall_trace_enter kernel/entry/common.c:68 [inline] __syscall_enter_from_user_work kernel/entry/common.c:96 [inline] syscall_enter_from_user_mode+0xd5/0x1b0 kernel/entry/common.c:114 do_syscall_64+0x1e/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88811b8d8000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 1136 bytes inside of 8192-byte region [ffff88811b8d8000, ffff88811b8da000) The buggy address belongs to the page: page:ffffea00046e3600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11b8d8 head:ffffea00046e3600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100043500 raw: 0000000000000000 0000000000020002 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 9067, ts 494092640516, free_ts 493815007828 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5780 allocate_slab mm/slub.c:1932 [inline] new_slab+0x9a/0x4e0 mm/slub.c:1995 ___slab_alloc+0x39e/0x830 mm/slub.c:3028 __slab_alloc+0x4a/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc_trace+0x147/0x270 mm/slub.c:3267 kmalloc include/linux/slab.h:603 [inline] audit_log_d_path+0xbd/0x2e0 kernel/audit.c:2153 audit_log_d_path_exe+0x42/0x70 kernel/audit.c:2224 audit_log_task+0x20d/0x2e0 kernel/auditsc.c:2682 audit_seccomp+0x7a/0x1e0 kernel/auditsc.c:2729 seccomp_log kernel/seccomp.c:988 [inline] __seccomp_filter+0xc08/0x1c60 kernel/seccomp.c:1254 __secure_computing+0xf0/0x300 kernel/seccomp.c:1316 syscall_trace_enter kernel/entry/common.c:68 [inline] __syscall_enter_from_user_work kernel/entry/common.c:96 [inline] syscall_enter_from_user_mode+0xd5/0x1b0 kernel/entry/common.c:114 do_syscall_64+0x1e/0xb0 arch/x86/entry/common.c:76 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+0x7c8/0x7d0 mm/page_alloc.c:3534 free_unref_page+0xe8/0x750 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5856 __free_slab+0xec/0x1d0 mm/slub.c:2020 free_slab mm/slub.c:2035 [inline] discard_slab mm/slub.c:2041 [inline] __unfreeze_partials+0x165/0x1a0 mm/slub.c:2527 put_cpu_partial+0xc4/0x120 mm/slub.c:2607 __slab_free+0x1c8/0x290 mm/slub.c:3390 do_slab_free mm/slub.c:3509 [inline] ___cache_free+0x109/0x120 mm/slub.c:3530 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x44/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x15a/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550 slab_alloc_node mm/slub.c:3240 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc_trace+0xf9/0x270 mm/slub.c:3267 kmalloc include/linux/slab.h:603 [inline] kzalloc include/linux/slab.h:733 [inline] kernfs_iop_get_link+0x65/0x5f0 fs/kernfs/symlink.c:136 vfs_readlink+0x16a/0x400 fs/namei.c:5081 Memory state around the buggy address: ffff88811b8d8300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811b8d8380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811b8d8400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811b8d8480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811b8d8500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================