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panic: ffs2_balloc: unwind failed (4)

Status: upstream: reported on 2026/04/03 13:33
Reported-by: syzbot+6a85d4fe8fa209ea90f7@syzkaller.appspotmail.com
First crash: 103d, last: 19h35m
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd panic: ffs2_balloc: unwind failed (2) 2 1 499d 499d 0/4 auto-obsoleted due to no activity on 2025/06/01 04:48
openbsd panic: ffs2_balloc: unwind failed (3) 2 1 285d 285d 0/4 auto-obsoleted due to no activity on 2026/01/01 15:18
openbsd panic: ffs2_balloc: unwind failed 2 1 669d 669d 0/4 auto-obsoleted due to no activity on 2024/12/13 17:12

Sample crash report:
panic: ffs2_balloc: unwind failed
Starting stack trace...
panic(ffffffff8340de2b) at panic+0x1ba sys/kern/subr_prf.c:229
ffs2_balloc(fffff800797f5f00,6001000003,1,fffff80007ffd618,1,ffff800033ccf6d0) at ffs2_balloc+0x1965
ffs_truncate(fffff800797f5f00,6001000004,0,fffff80007ffd618) at ffs_truncate+0x4f8 sys/ufs/ffs/ffs_inode.c:217
ufs_setattr(ffff800033ccf7f0) at ufs_setattr+0x8e0 sys/ufs/ufs/ufs_vnops.c:403
VOP_SETATTR(fffff800716b22b0,ffff800033ccf878,fffff80007ffd618,ffff80002a736a68) at VOP_SETATTR+0x112 sys/kern/vfs_vops.c:210
dotruncate(ffff80002a736a68,fffff800716b22b0,6001000004) at dotruncate+0x1da sys/kern/vfs_syscalls.c:2812
sys_truncate(ffff80002a736a68,ffff800033ccfb40,ffff800033ccfa90) at sys_truncate+0x13e sys/kern/vfs_syscalls.c:2836
syscall(ffff800033ccfb40) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff800033ccfb40) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc88bdfa0a10, count: 248
End of stack trace.
syncing disks...

Crashes (18):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/15 02:56 openbsd c070732167b6 2130f682 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/07/10 02:16 openbsd 21e28dfa3cff 4167ee25 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore panic: ffs2_balloc: unwind failed
2026/06/29 21:56 openbsd eed6eb79f3a4 6a0c72dc .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/06/20 05:41 openbsd e313e922acbc 62cc6db3 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore panic: ffs2_balloc: unwind failed
2026/06/19 21:11 openbsd e313e922acbc 62cc6db3 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/06/06 02:22 openbsd ce89dc54e9c4 cc095639 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/05/24 23:25 openbsd 6adc68a286a5 c69befb3 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore panic: ffs2_balloc: unwind failed
2026/05/24 12:15 openbsd 19a448b47c50 c69befb3 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/05/09 17:01 openbsd 387d82fb614c 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/05/08 01:30 openbsd d8525c0ee876 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/05/06 11:44 openbsd eec9cf095b26 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/04/26 18:07 openbsd 443952c09f98 9c2d0995 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/04/21 04:44 openbsd 5ca82bba1a6e 1a086e7c .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/04/19 22:50 openbsd 2fc67ad6b988 1a086e7c .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
2026/04/14 18:37 openbsd 84c70f1e56c7 1a086e7c .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore panic: ffs2_balloc: unwind failed
2026/04/12 10:37 openbsd 6018ae1d0153 4b3d9a38 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore panic: ffs2_balloc: unwind failed
2026/04/10 19:50 openbsd 411a0c209e89 4b3d9a38 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore panic: ffs2_balloc: unwind failed
2026/04/03 13:32 openbsd de6be2070bf6 4b3d9a38 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: ffs2_balloc: unwind failed
* Struck through repros no longer work on HEAD.