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BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
BUG: KASAN: use-after-free in test_bit_le include/asm-generic/bitops/le.h:21 [inline]
BUG: KASAN: use-after-free in reiserfs_readdir_inode+0xb0d/0x13b0 fs/reiserfs/dir.c:147
Read of size 8 at addr ffff88809bbc7000 by task syz-executor.5/20954

CPU: 1 PID: 20954 Comm: syz-executor.5 Not tainted 6.3.0-rc2-next-20230317-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351
 print_report mm/kasan/report.c:462 [inline]
 kasan_report+0x11c/0x130 mm/kasan/report.c:572
 check_region_inline mm/kasan/generic.c:181 [inline]
 kasan_check_range+0x141/0x190 mm/kasan/generic.c:187
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 test_bit_le include/asm-generic/bitops/le.h:21 [inline]
 reiserfs_readdir_inode+0xb0d/0x13b0 fs/reiserfs/dir.c:147
 iterate_dir+0x56e/0x6f0 fs/readdir.c:65
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __x64_sys_getdents64+0x13e/0x2c0 fs/readdir.c:354
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f05d548c0f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f05d61cc168 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f05d55abf80 RCX: 00007f05d548c0f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f05d54e7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe5b4df1ef R14: 00007f05d61cc300 R15: 0000000000022000
 </TASK>

The buggy address belongs to the physical page:
page:ffffea00026ef1c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x9bbc7
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 ffffea0002722608 ffffea0002712fc8 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 20890, tgid 20886 (syz-executor.1), ts 867582240489, free_ts 870574325429
 prep_new_page mm/page_alloc.c:2472 [inline]
 get_page_from_freelist+0xf75/0x2ab0 mm/page_alloc.c:4236
 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:5502
 __folio_alloc+0x16/0x40 mm/page_alloc.c:5534
 vma_alloc_folio+0x155/0x850 mm/mempolicy.c:2244
 shmem_alloc_folio+0x119/0x1e0 mm/shmem.c:1557
 shmem_alloc_and_acct_folio+0x15e/0x5d0 mm/shmem.c:1581
 shmem_get_folio_gfp+0xa86/0x1a80 mm/shmem.c:1926
 shmem_get_folio mm/shmem.c:2057 [inline]
 shmem_write_begin+0x14a/0x380 mm/shmem.c:2663
 generic_perform_write+0x256/0x570 mm/filemap.c:3921
 __generic_file_write_iter+0x2ae/0x500 mm/filemap.c:4049
 generic_file_write_iter+0xe3/0x350 mm/filemap.c:4081
 call_write_iter include/linux/fs.h:1854 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x9f6/0xe20 fs/read_write.c:584
 ksys_write+0x12b/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1468 [inline]
 free_unref_page_prepare+0x4d1/0xb60 mm/page_alloc.c:3298
 free_unref_page_list+0xe3/0xa70 mm/page_alloc.c:3439
 release_pages+0xcd7/0x1380 mm/swap.c:1042
 __pagevec_release+0x77/0xe0 mm/swap.c:1062
 pagevec_release include/linux/pagevec.h:63 [inline]
 folio_batch_release include/linux/pagevec.h:132 [inline]
 shmem_undo_range+0x5c0/0x1350 mm/shmem.c:929
 shmem_truncate_range mm/shmem.c:1027 [inline]
 shmem_evict_inode+0x32f/0xb60 mm/shmem.c:1142
 evict+0x2ed/0x6b0 fs/inode.c:665
 iput_final fs/inode.c:1748 [inline]
 iput fs/inode.c:1774 [inline]
 iput+0x4a7/0x7a0 fs/inode.c:1760
 dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401
 __dentry_kill+0x3c0/0x640 fs/dcache.c:607
 dentry_kill fs/dcache.c:733 [inline]
 dput+0x865/0xe10 fs/dcache.c:913
 __fput+0x3cc/0xa90 fs/file_table.c:329
 task_work_run+0x16f/0x270 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86

Memory state around the buggy address:
 ffff88809bbc6f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88809bbc6f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88809bbc7000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88809bbc7080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88809bbc7100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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