nfs on zfs panic

Philippe Pegon Philippe.Pegon at
Tue Jun 26 16:36:05 UTC 2007


I'm playing with zfs on vmware on FreeBSD current (world and kernel of 
today with GENERIC kernel). I have 3 disks (virtuals) in raidz :

# zpool status
   pool: tank
  state: ONLINE
  scrub: none requested

         NAME        STATE     READ WRITE CKSUM
         tank        ONLINE       0     0     0
           raidz1    ONLINE       0     0     0
             da0     ONLINE       0     0     0
             da1     ONLINE       0     0     0
             da2     ONLINE       0     0     0

errors: No known data errors

with this zfs configuration :

# zfs list
tank         844M  8.93G  25.3K  none
tank/nfs    24.0K  8.93G  24.0K  /mnt/nfs
tank/obj     436M  8.93G   436M  /usr/obj
tank/ports   244M  8.93G   244M  /usr/ports
tank/src     162M  8.93G   162M  /usr/src

/mnt/nfs is nfs exported (zfs set sharenfs=on tank/nfs) and when I mount 
it on a Linux box and try a ls from Linux, FreeBSD panic.

panic and debug informations :

# kgdb kernel.debug /var/crash/vmcore.0
[GDB will not be able to debug user-mode threads: 
/usr/lib/ Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain 
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-marcel-freebsd".

Unread portion of the kernel message buffer:

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x10
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0xc08d088d
stack pointer           = 0x28:0xd61f88f0
frame pointer           = 0x28:0xd61f8bec
code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 722 (nfsd)
panic: from debugger
cpuid = 0
Uptime: 3h46m48s
Physical memory: 499 MB
Dumping 52 MB: 37 21 5

#0  doadump () at pcpu.h:195
195             __asm __volatile("movl %%fs:0,%0" : "=r" (td));
(kgdb) backtrace
#0  doadump () at pcpu.h:195
#1  0xc074997e in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409
#2  0xc0749c3b in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3  0xc048bf87 in db_panic (addr=Could not find the frame base for 
) at /usr/src/sys/ddb/db_command.c:433
#4  0xc048c975 in db_command_loop () at /usr/src/sys/ddb/db_command.c:401
#5  0xc048e0e5 in db_trap (type=12, code=0) at 
#6  0xc07703d6 in kdb_trap (type=12, code=0, tf=0xd61f88b0) at 
#7  0xc09f31bc in trap_fatal (frame=0xd61f88b0, eva=16) at 
#8  0xc09f33f3 in trap_pfault (frame=0xd61f88b0, usermode=0, eva=16) at 
#9  0xc09f3d92 in trap (frame=0xd61f88b0) at 
#10 0xc09d9a0b in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#11 0xc08d088d in nfsrv_readdirplus (nfsd=0xc3bb4500, slp=0xc3d31900, 
td=0xc3b0be00, mrq=0xd61f8c58) at /usr/src/sys/nfsserver/nfs_serv.c:3640
#12 0xc08de4b4 in nfssvc (td=0xc3b0be00, uap=0xd61f8cfc) at 
#13 0xc09f36d3 in syscall (frame=0xd61f8d38) at 
#14 0xc09d9a70 in Xint0x80_syscall () at 
#15 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb) list *0xc08d088d
0xc08d088d is in nfsrv_readdirplus (/usr/src/sys/nfsserver/nfs_serv.c:3640).
3635                             */
3636                            if (VFS_VGET(vp->v_mount, dp->d_fileno, 
3637                                &nvp))
3638                                    goto invalid;
3639                            bzero((caddr_t)nfhp, NFSX_V3FH);
3640                            nfhp->fh_fsid =
3641                                    nvp->v_mount->mnt_stat.f_fsid;
3642                            /*
3643                             * XXXRW: Assert the mountpoints are the 
same so that
3644                             * we know that acquiring Giant based on the

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