[Qemu-devel] [Bug 543478] Re: qemus pmemsave doesn't accept "/" in filename

[Anthony Liguori]

The '/' character is used to create special expressions if double quotes
aren't used.

** Changed in: qemu
       Status: New => Invalid

-- 
qemus pmemsave doesn't accept "/" in filename
https://bugs.launchpad.net/bugs/543478
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Status in QEMU: Invalid
Status in “qemu-kvm” package in Ubuntu: New

Bug description:
Binary package hint: qemu-kvm

Please see my conversation with qemu:

(qemu) pmemsave 
unexpected end of expression
(qemu) help pmemsave 
pmemsave addr size file -- save to disk physical memory dump starting at 'addr' 
of size 'size'
(qemu) pmemsave 0 512M /tmp/qemu.mem
pmemsave: extraneous characters at the end of line
(qemu) pmemsave 0 512 /tmp/qemu.mem
invalid char in expression
(qemu) pmemsave 0 512 /tmp/qemu
invalid char in expression
(qemu) pmemsave 0 512 qemu.mem
(qemu) pmemsave 0 512M qemu.mem
pmemsave: extraneous characters at the end of line



Let me comment on each one of those:
(qemu) pmemsave 
unexpected end of expression

I expected some sort of hint as to where to get more information. Maybe just a 
"Type ``help pmemsave'' to get syntax information" would be sufficient.


(qemu) help pmemsave 
pmemsave addr size file -- save to disk physical memory dump starting at 'addr' 
of size 'size'

Nice. But an example would be nice. My proposal: "I.e.: pmemsave 0 1G 
/tmp/qemu.mem"


(qemu) pmemsave 0 512M /tmp/qemu.mem
pmemsave: extraneous characters at the end of line

eh. Would be nice if it told me *which* character was "extraneous" and what 
"extraneous" means. My proposal: "Couldn't parse character at position 23, 
please see help pmemsave for an example".


(qemu) pmemsave 0 512 /tmp/qemu.mem
invalid char in expression

Hm. Interesting. Again, would be nice if it printed me the offending character. 
My proposal: "Could not parse character at position 23, please see help 
pmemsave for an example".


(qemu) pmemsave 0 512 /tmp/qemu
invalid char in expression

Now I got rid of almost everything but it still doesn't work.


(qemu) pmemsave 0 512 qemu.mem

aha! No slashes?! Seriously?

(qemu) pmemsave 0 512M qemu.mem
pmemsave: extraneous characters at the end of line

And no "M" or "G" modifiers? If I want to dump 2GB then I'd have to calculate 
the number in bytes and paste that long string. I expected qemu to be able to 
parse the K, M, G suffixes.

Also, I'm wondering why it doesn't offer to dump all memory.

ProblemType: Bug
Architecture: amd64
CurrentDmesg:
 [150870.676062] kvm_intel: Unknown symbol kvm_vcpu_on_spin
 [150947.222923] cron[24260]: segfault at 0 ip (null) sp 00007fffe865eed8 error 
14 in cron[400000+9000]
 [150947.224187] cron[24261]: segfault at 0 ip (null) sp 00007fffe865eed8 error 
14 in cron[400000+9000]
Date: Sun Mar 21 15:03:13 2010
DistroRelease: Ubuntu 9.10
KvmCmdLine:
 UID        PID  PPID  C    SZ   RSS PSR STIME TTY          TIME CMD
 muelli   23807 23806 13 239738 228464 0 14:54 pts/8    00:01:22 /usr/bin/kvm 
-S -M pc -m 512 -smp 1 -name vanilla_ubuntu -monitor stdio -boot c -drive 
file=/home/muelli/qemu/ubuntu8.10/ubuntu.img,if=ide,index=0,boot=on -drive 
file=,if=ide,media=cdrom,index=2 -net 
nic,model=rtl8139,macaddr=f0:00:BA:12:34:56 -net 
user,hostfwd=tcp::2223-:22,smb=/tmp/share -serial pty -snapshot
MachineType: LENOVO 766636G
Package: kvm 1:84+dfsg-0ubuntu16+0.11.0+0ubuntu6.3
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: root=/dev/mapper/cryptroot 
source=UUID=9c3d5596-27c6-4fd5-bfcd-fa8eef6f1230 ro vdso32=0 quiet splash  
crashkernel=384M-2G:64M,2G-:128M
ProcVersionSignature: Ubuntu 2.6.32-16.24-generic
SourcePackage: qemu-kvm
Uname: Linux 2.6.32-16-generic x86_64
dmi.bios.date: 03/12/2009
dmi.bios.vendor: LENOVO
dmi.bios.version: 7NETC0WW (2.20 )
dmi.board.name: 766636G
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: 
dmi:bvnLENOVO:bvr7NETC0WW(2.20):bd03/12/2009:svnLENOVO:pn766636G:pvrThinkPadX61:rvnLENOVO:rn766636G:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 766636G
dmi.product.version: ThinkPad X61
dmi.sys.vendor: LENOVO