ERROR: (device loop8): txCommit: 
find_entry called with index = 0
read_mapping_page failed!
ERROR: (device loop8): txCommit: 
read_mapping_page failed!
bread failed!
jfs_mkdir: dtInsert returned -EIO
ERROR: (device loop8): jfs_mkdir: 
==================================================================
BUG: KASAN: slab-out-of-bounds in jfs_readdir+0x1973/0x3ae0 fs/jfs/jfs_dtree.c:2916
Read of size 1 at addr ffff888067546145 by task syz.8.659/12649

CPU: 1 UID: 0 PID: 12649 Comm: syz.8.659 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 jfs_readdir+0x1973/0x3ae0 fs/jfs/jfs_dtree.c:2916
 wrap_directory_iterator+0x99/0xe0 fs/readdir.c:65
 iterate_dir+0x3a5/0x580 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:410 [inline]
 __se_sys_getdents64+0xe4/0x260 fs/readdir.c:396
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f03f351f749
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:00007f03f1786038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f03f3775fa0 RCX: 00007f03f351f749
RDX: 0000000000001000 RSI: 0000200000000f80 RDI: 0000000000000003
RBP: 00007f03f35a3f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f03f3776038 R14: 00007f03f3775fa0 R15: 00007ffec14e2e38
 </TASK>

Allocated by task 12649:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_lru_noprof+0x193/0x6c0 mm/slub.c:5282
 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105
 alloc_inode+0x6a/0x1b0 fs/inode.c:346
 iget_locked+0x131/0x6a0 fs/inode.c:1470
 jfs_iget+0x24/0x470 fs/jfs/inode.c:29
 jfs_lookup+0x1c5/0x380 fs/jfs/namei.c:1469
 __lookup_slow+0x29d/0x3d0 fs/namei.c:1866
 lookup_slow+0x53/0x70 fs/namei.c:1883
 walk_component fs/namei.c:2229 [inline]
 lookup_last fs/namei.c:2730 [inline]
 path_lookupat+0x3f5/0x8c0 fs/namei.c:2754
 filename_lookup+0x212/0x570 fs/namei.c:2783
 user_path_at+0x3a/0x60 fs/namei.c:3576
 __do_sys_chdir fs/open.c:558 [inline]
 __se_sys_chdir+0x91/0x280 fs/open.c:552
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8880675457c0
 which belongs to the cache jfs_ip of size 2368
The buggy address is located 69 bytes to the right of
 allocated 2368-byte region [ffff8880675457c0, ffff888067546100)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880675430c0 pfn:0x67540
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff8880313b6e01
flags: 0x80000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000040 ffff8881436a5640 dead000000000122 0000000000000000
raw: ffff8880675430c0 00000000800d0009 00000000f5000000 ffff8880313b6e01
head: 0080000000000040 ffff8881436a5640 dead000000000122 0000000000000000
head: ffff8880675430c0 00000000800d0009 00000000f5000000 ffff8880313b6e01
head: 0080000000000003 ffffea00019d5001 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd2050(__GFP_RECLAIMABLE|__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6385, tgid 6384 (syz.3.72), ts 124814360097, free_ts 109051362009
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1857
 prep_new_page mm/page_alloc.c:1865 [inline]
 get_page_from_freelist+0x28c0/0x2960 mm/page_alloc.c:3915
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210
 alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3075 [inline]
 allocate_slab+0x86/0x3b0 mm/slub.c:3248
 new_slab mm/slub.c:3302 [inline]
 ___slab_alloc+0xb10/0x13e0 mm/slub.c:4656
 __slab_alloc+0xc6/0x1f0 mm/slub.c:4779
 __slab_alloc_node mm/slub.c:4855 [inline]
 slab_alloc_node mm/slub.c:5251 [inline]
 kmem_cache_alloc_lru_noprof+0x104/0x6c0 mm/slub.c:5282
 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105
 alloc_inode+0x6a/0x1b0 fs/inode.c:346
 new_inode+0x22/0x170 fs/inode.c:1175
 diReadSpecial+0x52/0x710 fs/jfs/jfs_imap.c:426
 jfs_mount+0x174/0x870 fs/jfs/jfs_mount.c:108
 jfs_fill_super+0x6bc/0xd80 fs/jfs/super.c:523
 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691
 vfs_get_tree+0x92/0x2a0 fs/super.c:1751
page last free pid 5799 tgid 5799 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1406 [inline]
 __free_pages_ok+0xa3e/0xba0 mm/page_alloc.c:1582
 __free_frozen_pages+0x11f/0x1170 mm/page_alloc.c:2939
 zstd_free_workspace fs/btrfs/zstd.c:366 [inline]
 zstd_free_workspace_manager+0x2c7/0x390 fs/btrfs/zstd.c:226
 btrfs_free_fs_info+0x5e/0x3c0 fs/btrfs/disk-io.c:1245
 deactivate_locked_super+0xbc/0x130 fs/super.c:474
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1318
 task_work_run+0x1d4/0x260 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
 exit_to_user_mode_loop+0xef/0x4e0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2c1/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888067546000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888067546080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888067546100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                           ^
 ffff888067546180: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888067546200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================