loop6: detected capacity change from 0 to 32768
ocfs2: Mounting device (7,6) on (node local, slot 0) with ordered data mode.
==================================================================
BUG: KASAN: use-after-free in ocfs2_dir_foreach_blk_id fs/ocfs2/dir.c:1787 [inline]
BUG: KASAN: use-after-free in ocfs2_dir_foreach_blk+0x132c/0x1b20 fs/ocfs2/dir.c:1925
Read of size 2 at addr ffff8880483ce8c9 by task syz.6.3640/16626

CPU: 1 UID: 0 PID: 16626 Comm: syz.6.3640 Not tainted 6.14.0-rc1-next-20250207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:489
 kasan_report+0x143/0x180 mm/kasan/report.c:602
 ocfs2_dir_foreach_blk_id fs/ocfs2/dir.c:1787 [inline]
 ocfs2_dir_foreach_blk+0x132c/0x1b20 fs/ocfs2/dir.c:1925
 ocfs2_readdir+0x2a1/0x5e0 fs/ocfs2/dir.c:1969
 wrap_directory_iterator+0x91/0xd0 fs/readdir.c:65
 iterate_dir+0x5a9/0x760 fs/readdir.c:108
 __do_sys_getdents fs/readdir.c:322 [inline]
 __se_sys_getdents+0x1fd/0x4e0 fs/readdir.c:308
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff9ced8cde9
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:00007ff9cfc14038 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007ff9cefa5fa0 RCX: 00007ff9ced8cde9
RDX: 0000000000000054 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007ff9cee0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff9cefa5fa0 R15: 00007fffebab4088
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x271 pfn:0x483ce
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000271 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 16639, tgid 16638 (syz.1.3647), ts 700166533436, free_ts 700665399998
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1629
 prep_new_page mm/page_alloc.c:1637 [inline]
 get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3555
 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4817
 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270
 folio_alloc_mpol_noprof+0x36/0x70 mm/mempolicy.c:2289
 shmem_alloc_folio mm/shmem.c:1863 [inline]
 shmem_alloc_and_add_folio+0x4a0/0x1090 mm/shmem.c:1902
 shmem_get_folio_gfp+0x621/0x1840 mm/shmem.c:2522
 shmem_fault+0x220/0x5b0 mm/shmem.c:2723
 __do_fault+0x135/0x390 mm/memory.c:5024
 do_read_fault mm/memory.c:5439 [inline]
 do_fault mm/memory.c:5573 [inline]
 do_pte_missing mm/memory.c:4092 [inline]
 handle_pte_fault mm/memory.c:5936 [inline]
 __handle_mm_fault+0x4c44/0x70f0 mm/memory.c:6079
 handle_mm_fault+0x3e5/0x8d0 mm/memory.c:6248
 faultin_page mm/gup.c:1193 [inline]
 __get_user_pages+0x1a92/0x4140 mm/gup.c:1488
 populate_vma_page_range+0x264/0x330 mm/gup.c:1926
 __mm_populate+0x27a/0x460 mm/gup.c:2029
 mm_populate include/linux/mm.h:3370 [inline]
 vm_mmap_pgoff+0x303/0x430 mm/util.c:580
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
page last free pid 16638 tgid 16638 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1205 [inline]
 free_unref_folios+0xe40/0x18b0 mm/page_alloc.c:2785
 folios_put_refs+0x6dc/0x7e0 mm/swap.c:992
 folio_batch_release include/linux/pagevec.h:101 [inline]
 shmem_undo_range+0x593/0x1820 mm/shmem.c:1112
 shmem_truncate_range mm/shmem.c:1224 [inline]
 shmem_evict_inode+0x29b/0xa80 mm/shmem.c:1352
 evict+0x4e8/0x9a0 fs/inode.c:796
 __dentry_kill+0x20d/0x630 fs/dcache.c:643
 dput+0x19f/0x2b0 fs/dcache.c:885
 __fput+0x60b/0x9f0 fs/file_table.c:472
 task_work_run+0x24f/0x310 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xa2a/0x2860 kernel/exit.c:949
 do_group_exit+0x207/0x2c0 kernel/exit.c:1098
 __do_sys_exit_group kernel/exit.c:1109 [inline]
 __se_sys_exit_group kernel/exit.c:1107 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1107
 x64_sys_call+0x26c3/0x26d0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff8880483ce780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880483ce800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8880483ce880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff8880483ce900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880483ce980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================