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[Qemu-devel] [Bug 735752] [NEW] qemu squeeze crashes "BUG: unable to han

From: Aidar Kamalov
Subject: [Qemu-devel] [Bug 735752] [NEW] qemu squeeze crashes "BUG: unable to handle kernel NULL pointer dereference at (null)"
Date: Tue, 15 Mar 2011 21:28:54 -0000 
Public bug reported:

my virtual machine server (qemu+libvirt) regularly breaks down with such a 
record in the logs
I can not even ping the guest, but i can ping host, but can not do something 
with it (cannot ssh login for example)
And I dont know how to reproduce the problem :(

Mar 15 17:58:04 mainhost kernel: [65866.976982] BUG: unable to handle kernel 
NULL pointer dereference at           (null)                                    
Mar 15 17:58:04 mainhost kernel: [65866.977422] IP: [<ffffffff8100efbe>] 
0xffffffff8100efbe                                                              
    
Mar 15 17:58:04 mainhost kernel: [65866.977663] PGD 7387b7067 PUD 81b723067 PMD 
0.                                                                           
Mar 15 17:58:04 mainhost kernel: [65866.977902] Oops: 0000 [#1] SMP.            
                                                                             
Mar 15 17:58:04 mainhost kernel: [65866.978128] last sysfs file: 
/sys/devices/system/cpu/cpu3/topology/thread_siblings                           
            
Mar 15 17:58:04 mainhost kernel: [65866.978572] CPU 1.                          
                                                                             
Mar 15 17:58:04 mainhost kernel: [65866.978577] Modules linked in: nfs lockd 
nfs_acl auth_rpcgss sunrpc ebtable_nat ebtables coretemp bridge stp llc xt_state
Mar 15 17:58:04 mainhost kernel: [65866.979737].                                
                                                                             
Mar 15 17:58:04 mainhost kernel: [65866.979959] Pid: 3369, comm: 
qemu-system-x86 Not tainted 2.6.37-gentoo-r2 #2 Intel S5000VSA/S5000VSA         
            
Mar 15 17:58:04 mainhost kernel: [65866.980085] RIP: 0010:[<ffffffff8100efbe>]  
[<ffffffff8100efbe>] 0xffffffff8100efbe                                      
Mar 15 17:58:04 mainhost kernel: [65866.980085] RSP: 0018:ffff880738767a48  
EFLAGS: 00010246                                                                
 
Mar 15 17:58:04 mainhost kernel: [65866.980085] RAX: 0000000000000000 RBX: 
fffffffffffff001 RCX: ffff88081cbeb948                                          
  
Mar 15 17:58:04 mainhost kernel: [65866.980085] RDX: 0000000000000022 RSI: 
fffffffffffff001 RDI: ffff88081cbeb000                                          
  
Mar 15 17:58:04 mainhost kernel: [65866.980085] RBP: 0000000000000001 R08: 
00000000000fee01 R09: 0000000000000022                                          
  
Mar 15 17:58:04 mainhost kernel: [65866.980085] R10: 0000008000000000 R11: 
ffffea0000000000 R12: ffff880818d83490                                          
  
Mar 15 17:58:04 mainhost kernel: [65866.980085] R13: 00000000155e5000 R14: 
0000000000000000 R15: 0000000000000100                                          
  
Mar 15 17:58:04 mainhost kernel: [65866.980085] FS:  00007f5f25e4e700(0000) 
GS:ffff88009f680000(0000) knlGS:fffff80001175000                                
 
Mar 15 17:58:04 mainhost kernel: [65866.980085] CS:  0010 DS: 002b ES: 002b 
CR0: 000000008005003b                                                           
 
Mar 15 17:58:04 mainhost kernel: [65866.980085] CR2: 0000000000000000 CR3: 
0000000806be9000 CR4: 00000000000426e0                                          
  
Mar 15 17:58:04 mainhost kernel: [65866.980085] DR0: 0000000000000045 DR1: 
0000000000000000 DR2: 0000000000000000                                          
  
Mar 15 17:58:04 mainhost kernel: [65866.980085] DR3: 0000000000000005 DR6: 
00000000ffff0ff0 DR7: 0000000000000400                                          
  
Mar 15 17:58:04 mainhost kernel: [65866.980085] Process qemu-system-x86 (pid: 
3369, threadinfo ffff880738766000, task ffff8808203ac360)                      
Mar 15 17:58:04 mainhost kernel: [65866.980085] Stack:                          
                                                                             
Mar 15 17:58:04 mainhost kernel: [65866.980085]  0000000000000000 
ffff8806a30f3ff8 ffff880753980000 ffffffff8100f06f                              
           
Mar 15 17:58:04 mainhost kernel: [65866.980085]  0000000000000ff8 
ffff8807705d6b40 0000000000000ff8 ffffffff810123f0                              
           
Mar 15 17:58:04 mainhost kernel: [65866.980085]  0000000000000000 
0000000000000000 0000000000000000 0000000000000000                              
           
Mar 15 17:58:04 mainhost kernel: [65866.980085] Call Trace:                     
                                                                             
Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff8100f06f>] ? 
0xffffffff8100f06f                                                              
     
Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff810123f0>] ? 
0xffffffff810123f0                                                              
     
Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff8100f744>] ? 
0xffffffff8100f744                                                              
     
Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff8100ffaf>] ? 
0xffffffff8100ffaf                                                              
     
Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff810011f1>] ? 
0xffffffff810011f1                                                              
     
Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff810142fc>] ? 
0xffffffff810142fc                                                              
     
Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff8100834d>] ? 
0xffffffff8100834d                                                              
     
Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff81011af6>] ? 
0xffffffff81011af6                                                              
     
Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff8100c5a7>] ? 
0xffffffff8100c5a7                                                              
     
Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff81003a85>] ? 
0xffffffff81003a85                                                              
     
Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff810e19b0>] ? 
0xffffffff810e19b0                                                              
     
Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff81078cd8>] ? 
0xffffffff81078cd8                                                              
     
Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff810e1a39>] ? 
0xffffffff810e1a39                                                              
     
Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff810267fb>] ? 
0xffffffff810267fb                                                              
     
Mar 15 17:58:04 mainhost kernel: [65866.980085] Code: 8b 47 50 8d 50 01 85 c0 
89 57 50 75 07 41 58 e9 32 ff ff ff 5f c3 55 89 d5 53 48 89 f3 48 83 ec 08 e8 d
Mar 15 17:58:04 mainhost kernel: [65866.980085] RIP  [<ffffffff8100efbe>] 
0xffffffff8100efbe                                                              
   
Mar 15 17:58:04 mainhost kernel: [65866.980085]  RSP <ffff880738767a48>         
                                                                             
Mar 15 17:58:04 mainhost kernel: [65866.980085] CR2: 0000000000000000           
                                                                             
Mar 15 17:58:04 mainhost kernel: [65866.990753] ---[ end trace d147f74976c2654d 
]---

Linux mainhost 2.6.37-gentoo-r2 #2 SMP Mon Mar 14 22:53:20 MSK 2011
x86_64 Intel(R) Xeon(R) CPU E5405 @ 2.00GHz GenuineIntel GNU/Linux

app-emulation/qemu-kvm-0.13.0-r2
app-emulation/libvirt-0.8.8-r1

mainhost log # ps ax|grep qemu
 2957 ?        Sl    12:28 /usr/bin/qemu-system-x86_64 --enable-kvm -S -M 
pc-0.13 -enable-kvm -m 512 -smp 1,sockets=1,cores=1,threads=1 -name dc1 -uuid 
f090bfc9-1cab-e4e9-51ea-80c9cc775bff -nodefconfig -nodefaults -chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/dc1.monitor,server,nowait -mon 
chardev=charmonitor,id=monitor,mode=control -rtc base=localtime -boot 
order=c,menu=off -drive 
file=/dev/vm-storage/dc1,if=none,id=drive-ide0-0-0,format=raw -device 
ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive 
if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device 
ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev 
tap,fd=13,id=hostnet0 -device 
rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:7e:a1:a7,bus=pci.0,addr=0x4 -usb 
-device usb-tablet,id=input0 -vnc 0.0.0.0:0,password -vga cirrus -device 
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
 2982 ?        Rl    10:34 /usr/bin/qemu-system-x86_64 --enable-kvm -S -M 
pc-0.13 -enable-kvm -m 1024 -smp 1,sockets=1,cores=1,threads=1 -name 
transarchive -uuid b96a3481-1ad6-9329-387e-a1504a17d0ee -nodefconfig 
-nodefaults -chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/transarchive.monitor,server,nowait
 -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime -boot 
order=c,menu=off -drive 
file=/dev/vm-storage/transarchive,if=none,id=drive-ide0-0-0,format=raw -device 
ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive 
if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device 
ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev 
tap,fd=13,id=hostnet0,vhost=on,vhostfd=17 -device 
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:a9:f8:06,bus=pci.0,addr=0x3 
-usb -device usb-tablet,id=input0 -vnc 0.0.0.0:3,password -vga std -device 
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/735752

Title:
  qemu squeeze crashes "BUG: unable to handle kernel NULL pointer
  dereference at           (null)"

Status in QEMU:
  New

Bug description:
  my virtual machine server (qemu+libvirt) regularly breaks down with such a 
record in the logs
  I can not even ping the guest, but i can ping host, but can not do something 
with it (cannot ssh login for example)
  And I dont know how to reproduce the problem :(

  Mar 15 17:58:04 mainhost kernel: [65866.976982] BUG: unable to handle kernel 
NULL pointer dereference at           (null)                                    
  Mar 15 17:58:04 mainhost kernel: [65866.977422] IP: [<ffffffff8100efbe>] 
0xffffffff8100efbe                                                              
    
  Mar 15 17:58:04 mainhost kernel: [65866.977663] PGD 7387b7067 PUD 81b723067 
PMD 0.                                                                          
 
  Mar 15 17:58:04 mainhost kernel: [65866.977902] Oops: 0000 [#1] SMP.          
                                                                               
  Mar 15 17:58:04 mainhost kernel: [65866.978128] last sysfs file: 
/sys/devices/system/cpu/cpu3/topology/thread_siblings                           
            
  Mar 15 17:58:04 mainhost kernel: [65866.978572] CPU 1.                        
                                                                               
  Mar 15 17:58:04 mainhost kernel: [65866.978577] Modules linked in: nfs lockd 
nfs_acl auth_rpcgss sunrpc ebtable_nat ebtables coretemp bridge stp llc xt_state
  Mar 15 17:58:04 mainhost kernel: [65866.979737].                              
                                                                               
  Mar 15 17:58:04 mainhost kernel: [65866.979959] Pid: 3369, comm: 
qemu-system-x86 Not tainted 2.6.37-gentoo-r2 #2 Intel S5000VSA/S5000VSA         
            
  Mar 15 17:58:04 mainhost kernel: [65866.980085] RIP: 
0010:[<ffffffff8100efbe>]  [<ffffffff8100efbe>] 0xffffffff8100efbe              
                        
  Mar 15 17:58:04 mainhost kernel: [65866.980085] RSP: 0018:ffff880738767a48  
EFLAGS: 00010246                                                                
 
  Mar 15 17:58:04 mainhost kernel: [65866.980085] RAX: 0000000000000000 RBX: 
fffffffffffff001 RCX: ffff88081cbeb948                                          
  
  Mar 15 17:58:04 mainhost kernel: [65866.980085] RDX: 0000000000000022 RSI: 
fffffffffffff001 RDI: ffff88081cbeb000                                          
  
  Mar 15 17:58:04 mainhost kernel: [65866.980085] RBP: 0000000000000001 R08: 
00000000000fee01 R09: 0000000000000022                                          
  
  Mar 15 17:58:04 mainhost kernel: [65866.980085] R10: 0000008000000000 R11: 
ffffea0000000000 R12: ffff880818d83490                                          
  
  Mar 15 17:58:04 mainhost kernel: [65866.980085] R13: 00000000155e5000 R14: 
0000000000000000 R15: 0000000000000100                                          
  
  Mar 15 17:58:04 mainhost kernel: [65866.980085] FS:  00007f5f25e4e700(0000) 
GS:ffff88009f680000(0000) knlGS:fffff80001175000                                
 
  Mar 15 17:58:04 mainhost kernel: [65866.980085] CS:  0010 DS: 002b ES: 002b 
CR0: 000000008005003b                                                           
 
  Mar 15 17:58:04 mainhost kernel: [65866.980085] CR2: 0000000000000000 CR3: 
0000000806be9000 CR4: 00000000000426e0                                          
  
  Mar 15 17:58:04 mainhost kernel: [65866.980085] DR0: 0000000000000045 DR1: 
0000000000000000 DR2: 0000000000000000                                          
  
  Mar 15 17:58:04 mainhost kernel: [65866.980085] DR3: 0000000000000005 DR6: 
00000000ffff0ff0 DR7: 0000000000000400                                          
  
  Mar 15 17:58:04 mainhost kernel: [65866.980085] Process qemu-system-x86 (pid: 
3369, threadinfo ffff880738766000, task ffff8808203ac360)                      
  Mar 15 17:58:04 mainhost kernel: [65866.980085] Stack:                        
                                                                               
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  0000000000000000 
ffff8806a30f3ff8 ffff880753980000 ffffffff8100f06f                              
           
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  0000000000000ff8 
ffff8807705d6b40 0000000000000ff8 ffffffff810123f0                              
           
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  0000000000000000 
0000000000000000 0000000000000000 0000000000000000                              
           
  Mar 15 17:58:04 mainhost kernel: [65866.980085] Call Trace:                   
                                                                               
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff8100f06f>] ? 
0xffffffff8100f06f                                                              
     
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff810123f0>] ? 
0xffffffff810123f0                                                              
     
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff8100f744>] ? 
0xffffffff8100f744                                                              
     
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff8100ffaf>] ? 
0xffffffff8100ffaf                                                              
     
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff810011f1>] ? 
0xffffffff810011f1                                                              
     
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff810142fc>] ? 
0xffffffff810142fc                                                              
     
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff8100834d>] ? 
0xffffffff8100834d                                                              
     
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff81011af6>] ? 
0xffffffff81011af6                                                              
     
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff8100c5a7>] ? 
0xffffffff8100c5a7                                                              
     
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff81003a85>] ? 
0xffffffff81003a85                                                              
     
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff810e19b0>] ? 
0xffffffff810e19b0                                                              
     
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff81078cd8>] ? 
0xffffffff81078cd8                                                              
     
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff810e1a39>] ? 
0xffffffff810e1a39                                                              
     
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  [<ffffffff810267fb>] ? 
0xffffffff810267fb                                                              
     
  Mar 15 17:58:04 mainhost kernel: [65866.980085] Code: 8b 47 50 8d 50 01 85 c0 
89 57 50 75 07 41 58 e9 32 ff ff ff 5f c3 55 89 d5 53 48 89 f3 48 83 ec 08 e8 d
  Mar 15 17:58:04 mainhost kernel: [65866.980085] RIP  [<ffffffff8100efbe>] 
0xffffffff8100efbe                                                              
   
  Mar 15 17:58:04 mainhost kernel: [65866.980085]  RSP <ffff880738767a48>       
                                                                               
  Mar 15 17:58:04 mainhost kernel: [65866.980085] CR2: 0000000000000000         
                                                                               
  Mar 15 17:58:04 mainhost kernel: [65866.990753] ---[ end trace 
d147f74976c2654d ]---

  Linux mainhost 2.6.37-gentoo-r2 #2 SMP Mon Mar 14 22:53:20 MSK 2011
  x86_64 Intel(R) Xeon(R) CPU E5405 @ 2.00GHz GenuineIntel GNU/Linux

  app-emulation/qemu-kvm-0.13.0-r2
  app-emulation/libvirt-0.8.8-r1

  mainhost log # ps ax|grep qemu
   2957 ?        Sl    12:28 /usr/bin/qemu-system-x86_64 --enable-kvm -S -M 
pc-0.13 -enable-kvm -m 512 -smp 1,sockets=1,cores=1,threads=1 -name dc1 -uuid 
f090bfc9-1cab-e4e9-51ea-80c9cc775bff -nodefconfig -nodefaults -chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/dc1.monitor,server,nowait -mon 
chardev=charmonitor,id=monitor,mode=control -rtc base=localtime -boot 
order=c,menu=off -drive 
file=/dev/vm-storage/dc1,if=none,id=drive-ide0-0-0,format=raw -device 
ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive 
if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device 
ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev 
tap,fd=13,id=hostnet0 -device 
rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:7e:a1:a7,bus=pci.0,addr=0x4 -usb 
-device usb-tablet,id=input0 -vnc 0.0.0.0:0,password -vga cirrus -device 
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
   2982 ?        Rl    10:34 /usr/bin/qemu-system-x86_64 --enable-kvm -S -M 
pc-0.13 -enable-kvm -m 1024 -smp 1,sockets=1,cores=1,threads=1 -name 
transarchive -uuid b96a3481-1ad6-9329-387e-a1504a17d0ee -nodefconfig 
-nodefaults -chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/transarchive.monitor,server,nowait
 -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime -boot 
order=c,menu=off -drive 
file=/dev/vm-storage/transarchive,if=none,id=drive-ide0-0-0,format=raw -device 
ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive 
if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device 
ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev 
tap,fd=13,id=hostnet0,vhost=on,vhostfd=17 -device 
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:a9:f8:06,bus=pci.0,addr=0x3 
-usb -device usb-tablet,id=input0 -vnc 0.0.0.0:3,password -vga std -device 
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4
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