panic: ffs_reallocblk: start == end

Kostik Belousov kostikbel at gmail.com
Thu Nov 15 20:49:20 PST 2007


On Thu, Nov 15, 2007 at 11:16:02PM +0100, Kris Kennaway wrote:
> Kris Kennaway wrote:
> >I got this panic on an 8 core amd64 running 8.0 when writing to a ufs on 
> >a md device:
> >
> >panic: ffs_reallocblk: start == end
> >
> >db> wh
> >Tracing pid 59911 tid 100115 td 0xffffff0003b90000
> >kdb_enter() at kdb_enter+0x31
> >panic() at panic+0x1c0
> >ffs_reallocblks() at ffs_reallocblks+0xb11
> >VOP_REALLOCBLKS_APV() at VOP_REALLOCBLKS_APV+0xb9
> >cluster_write() at cluster_write+0x38a
> >ffs_write() at ffs_write+0x575
> >VOP_WRITE_APV() at VOP_WRITE_APV+0x147
> >vn_write() at vn_write+0x213
> >dofilewrite() at dofilewrite+0x9a
> >kern_writev() at kern_writev+0x4f
> >write() at write+0x4b
> >syscall() at syscall+0x301
> >Xfast_syscall() at Xfast_syscall+0xab
> >--- syscall (4, FreeBSD ELF64, write), rip = 0x800a65d0c, rsp = 
> >0x7fffffffd268, rbp = 0x2800 ---
> >
> >Kris
> >
> 
> Another one of these on a different machine.  Looks like something is 
> definitely broken.
> 
Kris,
this is consequence of the checks moved from DIAGNOSTIC to INVARIANTS
ifdef for ffs, and actually being compiled as result. Peter Holm reported
the "ffs_truncate3" panic.
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