bcachefs (loop4): dirent points to missing inode:
  u64s 7 type dirent 4096:2695648408715017799:U32_MAX len 0 ver 0: file2 -> 536870913 type reg, fixing
==================================================================
BUG: KASAN: use-after-free in check_dirent fs/bcachefs/fsck.c:2395 [inline]
BUG: KASAN: use-after-free in bch2_check_dirents+0x1818/0x2760 fs/bcachefs/fsck.c:2421
Read of size 1 at addr ffff00010a360110 by task syz.4.678/9543

CPU: 0 UID: 0 PID: 9543 Comm: syz.4.678 Not tainted 6.16.0-rc7-syzkaller-g82af5ea7c611 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xa8/0x220 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:480
 kasan_report+0xb0/0x110 mm/kasan/report.c:593
 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378
 check_dirent fs/bcachefs/fsck.c:2395 [inline]
 bch2_check_dirents+0x1818/0x2760 fs/bcachefs/fsck.c:2421
 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:484 [inline]
 __bch2_run_recovery_passes+0x29c/0xd18 fs/bcachefs/recovery_passes.c:539
 bch2_run_recovery_passes+0x174/0x1f4 fs/bcachefs/recovery_passes.c:610
 bch2_fs_recovery+0x1c34/0x2fb4 fs/bcachefs/recovery.c:1016
 bch2_fs_start+0x940/0xbec fs/bcachefs/super.c:1213
 bch2_fs_get_tree+0x880/0x107c fs/bcachefs/fs.c:2488
 vfs_get_tree+0x90/0x28c fs/super.c:1804
 do_new_mount+0x228/0x814 fs/namespace.c:3902
 path_mount+0x5b4/0xde0 fs/namespace.c:4226
 do_mount fs/namespace.c:4239 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount fs/namespace.c:4427 [inline]
 __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4427
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14a360
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 05ffc00000000000 fffffdffc3ac0008 ffff0001fea8bbc8 0000000000000000
raw: 0000000000000000 0000000000000005 00000000f0000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff00010a360000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff00010a360080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff00010a360100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                         ^
 ffff00010a360180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff00010a360200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
bcachefs (loop4): hash table key at wrong offset: should be at 5178636093158006573
  u64s 8 type dirent 4096:8130059955150870709:U32_MAX len 0 ver 0: lost+foun -> 4097 type dir, fixing
bcachefs (loop4): dirent points to missing inode:
  u64s 8 type dirent 4096:9097378837824744618:U32_MAX len 0 ver 0: file.cold -> 172335562754 type reg, fixing
bcachefs (loop4): fsck counted subdirectories wrong for inum 4096:4294967295: got 1 should be 2
bcachefs (loop4): check_dirents requires second pass
 done
bcachefs (loop4): resume_logged_ops... done
bcachefs (loop4): delete_dead_inodes... done
bcachefs (loop4): Fixed errors, running fsck a second time to verify fs is clean
bcachefs (loop4): check_extents_to_backpointers... done
bcachefs (loop4): check_subvols... done
bcachefs (loop4): check_inodes... done
bcachefs (loop4): check_dirents... done
bcachefs (loop4): resume_logged_ops... done
bcachefs (loop4): delete_dead_inodes... done
bcachefs (loop4): done starting filesystem
iommufd_mock iommufd_mock0: Adding to iommu group 0