panic: ffs_blkfree: bad size (7)

Status: upstream: reported on 2026/08/25 21:59
Reported-by: syzbot+f9d625f9c7bc02d72b91@syzkaller.appspotmail.com
First crash: 4h36m, last: 4h36m
▶ ▼ Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd panic: ffs_blkfree: bad size (3) 2 1 956d 956d 0/4 auto-obsoleted due to no activity on 2024/04/11 20:56
openbsd panic: ffs_blkfree: bad size (5) 2 8 535d 564d 0/4 auto-obsoleted due to no activity on 2025/06/06 15:13
openbsd panic: ffs_blkfree: bad size (4) 2 5 739d 837d 0/4 auto-obsoleted due to no activity on 2024/11/14 17:32
openbsd panic: ffs_blkfree: bad size 2 2 2610d 2614d 0/4 auto-closed as invalid on 2019/10/25 14:12
openbsd panic: ffs_blkfree: bad size (6) 2 8 155d 229d 0/4 auto-obsoleted due to no activity on 2026/06/21 22:45
openbsd panic: ffs_blkfree: bad size (2) 2 1 1061d 1061d 0/4 auto-obsoleted due to no activity on 2023/12/28 07:11

Sample crash report:
panic: ffs_blkfree: bad size
Stopped at      db_enter+0x17:  popq    %rbp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*346140  91530      0           0        0x1    0  syz-executor
 175561  84420      0     0x14000      0x200    1  zerothread
db_enter() at

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/25 21:58 https://github.com/blackgnezdo/openbsd-src.git syzbot-kasan 18607adc5162 a9a1fc32 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-kasan panic: ffs_blkfree: bad size
* Struck through repros no longer work on HEAD.