Hi,
I run a bunch of virtual servers using KVM. And I a mmap.c bug on the guest
machine. The virtual machines are "desktop servers" for Thin Clients.
My host is running a 2.6.33 kernel and have 32GB of rami, opteron with
amd-v.
The guest is running 2.6.27.45 (tried 2.6.31.12, 2.6.32.9, 2.6.33), some
guests are using 10GB, 4GB or 20GB of ram.
My qemu-kvm version is 0.12.3
All guests are using NFSROOT as the ROOT FS and virtio as the network
driver.
I run the guest with:
kvm -cpu kvm64 -smp 4 -vnc :101 -daemonize -name ${NOME} -localtime -m $RAM
-net nic,macaddr=$VLAN0,model=virtio,vlan=0 -net tap,vlan=0,ifname=${NOME}0\
-net nic,macaddr=$VLAN121,model=virtio,vlan=121 -net tap,vlan=121,ifname=${NOME}121\
-net nic,macaddr=$VLAN112,model=virtio,vlan=112 -net tap,vlan=112,ifname=${NOME}112\
-kernel /root/vmlinuz-2.6.27.45-amd64-aufs-guest \
-append "root=/dev/nfs rw ip=dhcp nfsroot=$5 init=/sbin/boot.sh"
I have a machine running an identical kernel (without virtio stuff) for a
dedicated machine (as it does not have amd-v) and it stays up for days and
even months. But when running a guest machine with qemu-kvm i get some bug
message and lots of process in D state and i can't 'ps aux' or look inside
/proc and /sys without losing my shell (it hangs).
In `console` I get the folowing message, repeated for different processor,
different Pid and diferent mmap.c line (line 486 appears to).
------------[ cut here ]------------
kernel BUG at mm/mmap.c:869!
invalid opcode: 0000 [1] SMP
CPU 2
Pid: 31334, comm: nautilus Not tainted 2.6.27.45-amd64-aufs-guest-00267
#2
RIP: 0010:[<ffffffff8027b2e1>] [<ffffffff8027b2e1>] find_mergeable_ano
f1/0x200
RSP: 0000:ffff8804d933fb38 EFLAGS: 00010283
RAX: ffff8804cb44b9a8 RBX: ffff8804cb44b978 RCX: ffff8804fe6d3088
RDX: 00000000f4803000 RSI: ffff8804fe6d3088 RDI: ffff88049fa56138
RBP: ffff88049fa56138 R08: ffff8804d933e000 R09: 0000000000000000
R10: 00000000ffffffff R11: 00000000ffffffff R12: 0000000000100073
R13: 0000000000100073 R14: 00000000f4803000 R15: ffffffff806ce6c0
FS: 0000000000000000(0000) GS:ffff88051cc7d440(0063) knlGS:00000000f41
CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b
CR2: 00000000f4803000 CR3: 00000004a7d39000 CR4: 00000000000006a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process nautilus (pid: 31334, threadinfo ffff8804d933e000, task ffff880
)
Stack: ffffffff8052e62d 0000000000000000 0000000000000000 ffff88049fa5
ffff88051a5aac40 ffffffff80280382 ffff8804cb41b790 ffff880498919018
0000000000000000 ffff88049f8dad20 00003ffffffff000 ffffffff802770aa
Call Trace:
[<ffffffff8052e62d>] ? _spin_lock_irq+0xd/0x10
[<ffffffff80280382>] ? anon_vma_prepare+0x52/0x100
[<ffffffff802770aa>] ? handle_mm_fault+0x65a/0x900
[<ffffffff802de6d8>] ? proc_alloc_inode+0x58/0x90
[<ffffffff8052e545>] ? __down_read+0x85/0xbc
[<ffffffff80223331>] ? do_page_fault+0x2a1/0xab0
[<ffffffff803d6899>] ? vsnprintf+0x4d9/0x750
[<ffffffff8029d7a1>] ? do_lookup+0x81/0x240
[<ffffffff8027265d>] ? zone_statistics+0x7d/0x80
[<ffffffff8052ea3a>] ? error_exit+0x0/0x70
[<ffffffff803d706d>] ? copy_user_generic_string+0x2d/0x40
[<ffffffff802e35ec>] ? proc_file_read+0x12c/0x2e0
[<ffffffff802e34c0>] ? proc_file_read+0x0/0x2e0
[<ffffffff802dec1a>] ? proc_reg_read+0x8a/0xe0
[<ffffffff80295995>] ? vfs_read+0xb5/0x160
[<ffffffff80295b2e>] ? sys_read+0x4e/0x90
[<ffffffff80227004>] ? ia32_sysret+0x0/0x5
Code: 29 d0 48 c1 e8 0c 48 01 f8 48 3b 83 88 00 00 00 0f 85 5b fe ff ff
78 e9 c5 fe ff ff 0f 1f 00 31 f6 31 db e9 a9 fe ff ff <0f> 0b eb fe 66
1f 84 00 00 00 00 00 48 83 ec 08 48 8b
RIP [<ffffffff8027b2e1>] find_mergeable_anon_vma+0x1f1/0x200
RSP <ffff8804d933fb38>
---[ end trace e5ca25224cd7d1d4 ]---
Does anyone has a sugestion? Where to look? What else should I trace?
Thanks in advance,
--
Bruno Ribas - ribas@xxxxxxxxxxxx
http://www.inf.ufpr.br/ribas
C3SL: http://www.c3sl.ufpr.br
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