[Bug 293244] ufs: crash involving (non)existant file

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293244

            Bug ID: 293244
           Summary: ufs: crash involving (non)existant file
           Product: Base System
           Version: 15.0-RELEASE
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: [email protected]
          Reporter: [email protected]

I have experienced some sort of UFS defect on a 15.0-RELEASE machine
(powerpc64le).
git reported that a file was missing that seemed to still exist:

$ ls deskutils/xcalendar/files/patch-dayeditor.c
ls: deskutils/xcalendar/files/patch-dayeditor.c: No such file or directory
$ ls deskutils/xcalendar/files/
patch-Imakefile         patch-dayeditor.c       xcalendar-uj.hlp.sed
patch-XCal-uj.sed       patch-xcalendar.c       xcalendar-uj.hol
patch-XCalendar.sed     patch-xcalendar.h       xcalendar-uj.man.sed
$ rm deskutils/xcalendar/files/patch-dayeditor.c 
rm: deskutils/xcalendar/files/patch-dayeditor.c: No such file or directory
$ ls deskutils/xcalendar/files/
patch-Imakefile         patch-dayeditor.c       xcalendar-uj.hlp.sed
patch-XCal-uj.sed       patch-xcalendar.c       xcalendar-uj.hol
patch-XCalendar.sed     patch-xcalendar.h       xcalendar-uj.man.sed
$ mv deskutils/xcalendar/files/patch-dayeditor.c .
(server crashes)

The console shows the following crash:

panic: Bad effnlink fip 0xc000000104e9ca28, fdp 0xc000000104e1b3e8, tdp
0xc0000001090deed8
cpuid = 7
time = 1771351460
KDB: stack backtrace:
#0 0xc000000002f99884 at kdb_backtrace+0x84
#1 0xc000000002f284cc at vpanic+0x1ac
#2 0xc000000002f28300 at panic+0x40
#3 0xc000000003411bc8 at ufs_vinit+0x31a8
#4 0xc00000000357a5cc at VOP_RENAME_APV+0x4c
#5 0xc0000000030a2940 at kern_renameat+0x5c0
#6 0xc0000000030a2350 at sys_rename+0x30
#7 0xc00000000356b098 at trap+0xd88
#8 0xc00000000356a8dc at trap+0x5cc
#9 0xc00000000355e0a4 at powerpc_interrupt+0x1b4
Uptime: 2m42s

Unfortunately I have no debug symbols on this kernel, which is the kernel from
15.0 with this patch applied: https://github.com/openzfs/zfs/pull/18218.

A file system check reports:

# fsck -f /
** /dev/ada0p2
** Last Mounted on /
** Root file system
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
/usr/ports/audio/midi-matrix-lv2/pkg-plist IS AN EXTRANEOUS HARD LINK TO
DIRECTORY /usr/src/crypto/openssl/demos/pkey
REMOVE? [yn] y

UNALLOCATED  I=112099165  OWNER=root MODE=0
SIZE=0 MTIME=Feb 16 16:35 2026 
NAME=/home/main.ports/deskutils/xcalendar/files/patch-dayeditor.c

UNEXPECTED SOFT UPDATE INCONSISTENCY

REMOVE? [yn] y

** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
FREE BLK COUNT(S) WRONG IN SUPERBLK
SALVAGE? [yn] y

SUMMARY INFORMATION BAD
SALVAGE? [yn] y

BLK(S) MISSING IN BIT MAPS
SALVAGE? [yn] y

1127016 files, 33449276 used, 202052774 free (30934 frags, 25252730 blocks,
0.0% fragmentation)

***** FILE SYSTEM MARKED CLEAN *****

***** FILE SYSTEM WAS MODIFIED *****

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