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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+0x99f/0xa80 mm/filemap.c:175
Read of size 4 at addr ffff88816e4df470 by task syz-executor.1/15949

CPU: 0 PID: 15949 Comm: syz-executor.1 Tainted: G        W         5.10.199-syzkaller-00307-gd30b996835c0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:452
 __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+0x99f/0xa80 mm/filemap.c:175
 __delete_from_page_cache+0xd0/0x5d0 mm/filemap.c:243
 __remove_mapping+0x567/0x690 mm/vmscan.c:978
 shrink_page_list+0x1f38/0x4c60 mm/vmscan.c:1491
 shrink_inactive_list+0x591/0x1150 mm/vmscan.c:2068
 shrink_list mm/vmscan.c:2287 [inline]
 shrink_lruvec+0xced/0x3860 mm/vmscan.c:5466
 shrink_node_memcgs mm/vmscan.c:5653 [inline]
 shrink_node+0xdf3/0x1fb0 mm/vmscan.c:5683
 shrink_zones mm/vmscan.c:5886 [inline]
 do_try_to_free_pages+0x67e/0x15e0 mm/vmscan.c:5944
 try_to_free_mem_cgroup_pages+0x369/0x830 mm/vmscan.c:6262
 try_charge+0x4b8/0x15f0 mm/memcontrol.c:2742
 __mem_cgroup_charge+0x147/0x6e0 mm/memcontrol.c:6847
 mem_cgroup_charge include/linux/memcontrol.h:458 [inline]
 __add_to_page_cache_locked+0x29d/0xba0 mm/filemap.c:854
 add_to_page_cache_lru+0x117/0x2c0 mm/filemap.c:948
 pagecache_get_page+0x71e/0x950 mm/filemap.c:1859
 grab_cache_page_write_begin+0x5d/0xa0 mm/filemap.c:3459
 ext4_da_write_begin+0x587/0xf60 fs/ext4/inode.c:3055
 generic_perform_write+0x2cd/0x570 mm/filemap.c:3509
 ext4_buffered_write_iter+0x482/0x610 fs/ext4/file.c:271
 ext4_file_write_iter+0x193/0x1c80 fs/ext4/file.c:685
 __kernel_write+0x5ab/0x9d0 fs/read_write.c:550
 dump_emit+0x261/0x3a0 fs/coredump.c:849
 dump_user_range+0x71/0x1a0 fs/coredump.c:902
 elf_core_dump+0x33bd/0x3c10 fs/binfmt_elf.c:2287
 do_coredump+0x1eb8/0x2d60 fs/coredump.c:811
 get_signal+0x102c/0x1410 kernel/signal.c:2768
 arch_do_signal_or_restart+0xbd/0x17c0 arch/x86/kernel/signal.c:805
 handle_signal_work kernel/entry/common.c:145 [inline]
 exit_to_user_mode_loop+0x9b/0xd0 kernel/entry/common.c:169
 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline]
 irqentry_exit_to_user_mode+0x5a/0x80 kernel/entry/common.c:287
 irqentry_exit+0x12/0x60 kernel/entry/common.c:375
 exc_page_fault+0x33d/0x5b0 arch/x86/mm/fault.c:1521
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571
RIP: 0033:0xf354906b26
Code: Unable to access opcode bytes at RIP 0xf354906afc.
RSP: 002b:00000000200001e8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f6d0bbf4050 RCX: 00007f6d0bad4ae9
RDX: 0000000020000200 RSI: 00000000200001e0 RDI: 000000004008a080
RBP: 00007f6d0bb2047a R08: 0000000020000280 R09: 0000000020000280
R10: 0000000020000240 R11: 0000000000000202 R12: 0000000000000000
R13: 000000000000000b R14: 00007f6d0bbf4050 R15: 00007ffc8e762928

The buggy address belongs to the page:
page:ffffea0005b937c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16e4df
flags: 0x4000000000000000()
raw: 4000000000000000 0000000000000000 ffffea0005b93788 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d2800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 11398, ts 1412113645713, free_ts 1425061415185
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x166/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5346
 allocate_slab mm/slub.c:1808 [inline]
 new_slab+0x80/0x400 mm/slub.c:1869
 new_slab_objects mm/slub.c:2627 [inline]
 ___slab_alloc+0x302/0x4b0 mm/slub.c:2791
 __slab_alloc+0x63/0xa0 mm/slub.c:2831
 slab_alloc_node mm/slub.c:2913 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x1b9/0x2e0 mm/slub.c:2960
 mempool_alloc_slab+0x1d/0x30 mm/mempool.c:513
 mempool_alloc+0x11f/0x530 mm/mempool.c:393
 bvec_alloc+0x13a/0x180 block/bio.c:208
 bio_alloc_bioset+0x39b/0x650 block/bio.c:506
 bio_alloc include/linux/bio.h:412 [inline]
 io_submit_init_bio fs/ext4/page-io.c:406 [inline]
 io_submit_add_bh fs/ext4/page-io.c:431 [inline]
 ext4_bio_write_page+0xf6c/0x1760 fs/ext4/page-io.c:556
 mpage_submit_page+0x1bf/0x260 fs/ext4/inode.c:2145
 mpage_process_page_bufs+0x698/0x800 fs/ext4/inode.c:2259
 mpage_prepare_extent_to_map+0x9f6/0xd70 fs/ext4/inode.c:2687
 ext4_writepages+0xc7f/0x3c00 fs/ext4/inode.c:2815
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1349 [inline]
 __free_pages_ok+0x82c/0x850 mm/page_alloc.c:1629
 free_the_page+0x76/0x370 mm/page_alloc.c:5407
 __free_pages+0x67/0xc0 mm/page_alloc.c:5416
 __free_slab+0xcf/0x190 mm/slub.c:1894
 free_slab mm/slub.c:1909 [inline]
 discard_slab+0x29/0x40 mm/slub.c:1915
 __slab_free+0x30d/0x3a0 mm/slub.c:3131
 do_slab_free mm/slub.c:3191 [inline]
 ___cache_free+0x111/0x130 mm/slub.c:3210
 qlink_free+0x50/0x90 mm/kasan/quarantine.c:157
 qlist_free_all+0x47/0xb0 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x15a/0x170 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:440
 kasan_slab_alloc include/linux/kasan.h:244 [inline]
 slab_post_alloc_hook+0x61/0x2f0 mm/slab.h:583
 slab_alloc_node mm/slub.c:2947 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x168/0x2e0 mm/slub.c:2960
 getname_flags+0xba/0x520 fs/namei.c:141
 user_path_at_empty+0x2d/0x50 fs/namei.c:2740
 do_readlinkat+0x114/0x3a0 fs/stat.c:414

Memory state around the buggy address:
 ffff88816e4df300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88816e4df380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88816e4df400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                             ^
 ffff88816e4df480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88816e4df500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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