loop1: detected capacity change from 0 to 32768
==================================================================
BUG: KASAN: use-after-free in __ocfs2_find_path+0x1ff/0x7e0 fs/ocfs2/alloc.c:1817
Read of size 4 at addr ffff888056390000 by task syz.1.2/3757

CPU: 0 PID: 3757 Comm: syz.1.2 Not tainted 6.1.112-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15f/0x4f0 mm/kasan/report.c:395
 kasan_report+0x136/0x160 mm/kasan/report.c:495
 __ocfs2_find_path+0x1ff/0x7e0 fs/ocfs2/alloc.c:1817
 ocfs2_find_leaf+0xcb/0x220 fs/ocfs2/alloc.c:1931
 ocfs2_get_clusters_nocache+0x1a9/0xbe0 fs/ocfs2/extent_map.c:418
 ocfs2_get_clusters+0x5b5/0xbc0 fs/ocfs2/extent_map.c:621
 ocfs2_extent_map_get_blocks+0x248/0x7d0 fs/ocfs2/extent_map.c:668
 ocfs2_read_virt_blocks+0x313/0xab0 fs/ocfs2/extent_map.c:977
 ocfs2_read_dir_block fs/ocfs2/dir.c:508 [inline]
 ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline]
 ocfs2_find_entry+0x436/0x28c0 fs/ocfs2/dir.c:1080
 ocfs2_find_files_on_disk+0x10d/0x3a0 fs/ocfs2/dir.c:1982
 ocfs2_lookup_ino_from_name+0xad/0x1e0 fs/ocfs2/dir.c:2004
 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline]
 ocfs2_get_system_file_inode+0x314/0x7b0 fs/ocfs2/sysfile.c:112
 ocfs2_init_global_system_inodes+0x328/0x720 fs/ocfs2/super.c:457
 ocfs2_initialize_super fs/ocfs2/super.c:2250 [inline]
 ocfs2_fill_super+0x2f82/0x5730 fs/ocfs2/super.c:994
 mount_bdev+0x2c9/0x3f0 fs/super.c:1443
 legacy_get_tree+0xeb/0x180 fs/fs_context.c:632
 vfs_get_tree+0x88/0x270 fs/super.c:1573
 do_new_mount+0x2ba/0xb40 fs/namespace.c:3051
 do_mount fs/namespace.c:3394 [inline]
 __do_sys_mount fs/namespace.c:3602 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3579
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f75e877f79a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f75e9545e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f75e9545ef0 RCX: 00007f75e877f79a
RDX: 0000000020004440 RSI: 0000000020000780 RDI: 00007f75e9545eb0
RBP: 0000000020004440 R08: 00007f75e9545ef0 R09: 0000000001000000
R10: 0000000001000000 R11: 0000000000000246 R12: 0000000020000780
R13: 00007f75e9545eb0 R14: 000000000000444a R15: 00000000200005c0
 </TASK>

The buggy address belongs to the physical page:
page:ffffea000158e400 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x56390
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea000158e448 ffff8880b8e411e0 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 3714, tgid 3714 (udevd), ts 62711515275, free_ts 62718285998
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2517
 prep_new_page mm/page_alloc.c:2524 [inline]
 get_page_from_freelist+0x322e/0x33b0 mm/page_alloc.c:4290
 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5558
 __folio_alloc+0xf/0x30 mm/page_alloc.c:5590
 vma_alloc_folio+0x486/0x990 mm/mempolicy.c:2243
 shmem_alloc_folio mm/shmem.c:1589 [inline]
 shmem_alloc_and_acct_folio+0x5a8/0xd50 mm/shmem.c:1613
 shmem_get_folio_gfp+0x13f0/0x3470 mm/shmem.c:1941
 shmem_get_folio mm/shmem.c:2072 [inline]
 shmem_write_begin+0x16e/0x4e0 mm/shmem.c:2559
 generic_perform_write+0x2fc/0x5e0 mm/filemap.c:3817
 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3945
 generic_file_write_iter+0xab/0x310 mm/filemap.c:3977
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x857/0xbc0 fs/read_write.c:584
 ksys_write+0x19c/0x2c0 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1444 [inline]
 free_pcp_prepare mm/page_alloc.c:1494 [inline]
 free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3369
 free_unref_page_list+0x663/0x900 mm/page_alloc.c:3510
 release_pages+0x2836/0x2b40 mm/swap.c:1055
 __pagevec_release+0x80/0xf0 mm/swap.c:1075
 pagevec_release include/linux/pagevec.h:71 [inline]
 folio_batch_release include/linux/pagevec.h:135 [inline]
 shmem_undo_range+0x865/0x2390 mm/shmem.c:946
 shmem_truncate_range mm/shmem.c:1062 [inline]
 shmem_evict_inode+0x265/0xa60 mm/shmem.c:1171
 evict+0x529/0x930 fs/inode.c:701
 __dentry_kill+0x436/0x650 fs/dcache.c:611
 dentry_kill+0xbb/0x290
 dput+0xfb/0x1d0 fs/dcache.c:918
 do_renameat2+0xded/0x1440 fs/namei.c:5031
 __do_sys_rename fs/namei.c:5075 [inline]
 __se_sys_rename fs/namei.c:5073 [inline]
 __x64_sys_rename+0x82/0x90 fs/namei.c:5073
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Memory state around the buggy address:
 ffff88805638ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88805638ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888056390000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888056390080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888056390100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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