panic: vm_fault_copy_wired: page missing

Daniel Braniss danny at
Sun Apr 7 12:58:30 UTC 2013

> on 05/04/2013 12:33 Daniel Braniss said the following:
> > The system is running FreeBSD-9.1-stable, and is dataless/diskless.
> > the culprit is mlockall(2) which is called from the automounter amd/am-utils,
> > commenting the call, eliminates the panic.
> > 
> > I don't know when the problem surfaced, I was last hit by this
> > 2 years ago almost to the day - creepy.
> > 
> > I can make this happen by first running firefox, and the trying some
> > command that involves the automounter.
> > 
> > so is someone interested in fixing this?
> So, is there someone interested in properly reporting the problem first?
> :-)
since it seems to be happening only to me, I wasn't sure if it was a good idea
writing a long message with allot of info that noone would read :-)

so, in the meantime, some more info:
when the root file system is NOT via NFS all seems ok,
when the root is via NFS, no matter is amd is via NFS or not, it panics:

panic: vm_fault_copy_wired: page missing
cpuid = 1
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a/frame 0xffffff814907a790
kdb_backtrace() at kdb_backtrace+0x37/frame 0xffffff814907a850
panic() at panic+0x1ce/frame 0xffffff814907a950
vm_fault_copy_entry() at vm_fault_copy_entry+0x28e/frame 0xffffff814907a9e0
vmspace_fork() at vmspace_fork+0x553/frame 0xffffff814907aa30
fork1() at fork1+0x328/frame 0xffffff814907aae0
sys_fork() at sys_fork+0x22/frame 0xffffff814907ab10
amd64_syscall() at amd64_syscall+0x540/frame 0xffffff814907ac30
Xfast_syscall() at Xfast_syscall+0xf7/frame 0xffffff814907ac30
--- syscall (2, FreeBSD ELF64, sys_fork), rip = 0x800edd36c, rsp = 
0x7fffffffd0c8, rbp = 0 ---

#0  doadump (textdump=1) at /r+d/stable/9/sys/kern/kern_shutdown.c:266
#1  0xffffffff809022b4 in kern_reboot (howto=260)
    at /r+d/stable/9/sys/kern/kern_shutdown.c:449
#2  0xffffffff809027a7 in panic (fmt=0x1 <Address 0x1 out of bounds>)
    at /r+d/stable/9/sys/kern/kern_shutdown.c:637
#3  0xffffffff80b62e6e in vm_fault_copy_entry (dst_map=0xfffffe001270adc8, 
    src_map=<value optimized out>, dst_entry=0xfffffe0012bc2348, 
    src_entry=<value optimized out>, fork_charge=<value optimized out>)
    at /r+d/stable/9/sys/vm/vm_fault.c:1356
#4  0xffffffff80b6bb73 in vmspace_fork (vm1=0xfffffe000de90498, 
    fork_charge=0xffffff814907aaa8) at /r+d/stable/9/sys/vm/vm_map.c:3035
#5  0xffffffff808d1828 in fork1 (td=0xfffffe00122d3920, flags=20, pages=4, 
    procp=0xffffff814907ab00, procdescp=<value optimized out>, 
    pdflags=<value optimized out>) at /r+d/stable/9/sys/kern/kern_fork.c:841
#6  0xffffffff808d3272 in sys_fork (td=0xfffffe00122d3920, 
    uap=<value optimized out>) at /r+d/stable/9/sys/kern/kern_fork.c:110
#7  0xffffffff80c8f330 in amd64_syscall (td=0xfffffe00122d3920, traced=0)
    at subr_syscall.c:135
#8  0xffffffff80c79a17 in Xfast_syscall ()
    at /r+d/stable/9/sys/amd64/amd64/exception.S:387
#9  0x0000000800edd36c in ?? ()
Previous frame inner to this frame (corrupt stack?)


> -- 
> Andriy Gapon

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