Hello,
we often get Kernel BUG().
dmesg:
------------[ cut here ]------------
kernel BUG at fs/nfs/write.c:276!
invalid opcode: 0000 [#2] SMP
last sysfs file: /sys/devices/virtio-pci/virtio1/block/vda/size
CPU 0
Modules linked in:
Pid: 2098, comm: flush-0:17 Tainted: G D 2.6.35.3.x86_64.aufs
#4 /Bochs
RIP: 0010:[<ffffffff811b66f1>] [<ffffffff811b66f1>]
nfs_do_writepage+0x201/0x210
RSP: 0018:ffff88003c601a10 EFLAGS: 00010202
RAX: 0000000000000002 RBX: ffff880037951f80 RCX: 0000000000000001
RDX: 0000000000001fa0 RSI: 000000000000000b RDI: ffff880037a8cc00
RBP: ffffea00006286f8 R08: ffff88003c601920 R09: 0000000000000000
R10: 00000000ffffffff R11: ffff88001d4895c8 R12: 0000000000000000
R13: 0000000000000001 R14: ffff88003c601bb0 R15: ffff88003c601d40
FS: 0000000000000000(0000) GS:ffff880001800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000841210 CR3: 000000003daa5000 CR4: 00000000000006b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process flush-0:17 (pid: 2098, threadinfo ffff88003c600000, task
ffff880037afd230)
Stack:
ffff88001d409c50 ffffffff810a7dda ffffffff811ab70b ffff88003c601a58
<0> 0000000000000286 ffffea00006286f8 ffff88001d409c50 ffffffffffffffff
<0> ffffea00006286f8 0000000000000000 ffff88003c601ae8 ffffffff811b6d26
Call Trace:
[<ffffffff810a7dda>] ? find_get_pages_tag+0x3a/0x110
[<ffffffff811ab70b>] ? nfs_refresh_inode+0x4b/0x70
[<ffffffff811b6d26>] ? nfs_writepages_callback+0x16/0x40
[<ffffffff810af4c1>] ? write_cache_pages+0x1a1/0x370
[<ffffffff811b6d10>] ? nfs_writepages_callback+0x0/0x40
[<ffffffff811b6c86>] ? nfs_writepages+0xa6/0x130
[<ffffffff811b8000>] ? nfs_flush_one+0x0/0xe0
[<ffffffff811013a9>] ? writeback_single_inode+0xe9/0x400
[<ffffffff81101b36>] ? writeback_sb_inodes+0x196/0x270
[<ffffffff810464f0>] ? pvclock_clocksource_read+0x50/0xc0
[<ffffffff8110245c>] ? writeback_inodes_wb+0x9c/0x1a0
[<ffffffff8110279b>] ? wb_writeback+0x23b/0x2a0
[<ffffffff810575ec>] ? finish_task_switch+0x3c/0xc0
[<ffffffff81102963>] ? wb_do_writeback+0x163/0x170
[<ffffffff81406e64>] ? schedule_timeout+0x164/0x230
[<ffffffff811029b7>] ? bdi_writeback_task+0x47/0x150
[<ffffffff81075484>] ? bit_waitqueue+0x14/0xb0
[<ffffffff81408765>] ? _raw_spin_lock+0x5/0x10
[<ffffffff810bbe1e>] ? bdi_start_fn+0x7e/0x100
[<ffffffff810bbda0>] ? bdi_start_fn+0x0/0x100
[<ffffffff810750ce>] ? kthread+0x8e/0xa0
[<ffffffff8102a384>] ? kernel_thread_helper+0x4/0x10
[<ffffffff81075040>] ? kthread+0x0/0xa0
[<ffffffff8102a380>] ? kernel_thread_helper+0x0/0x10
Code: ff ff 48 63 d8 e9 0c ff ff ff 0f 0b eb fe 0f 1f 40 00 48 83 c7 48
31 f6 e8 ad 4b f0 ff e9 69 ff ff ff 48 8b 45 10 e9 36 ff ff ff <0f> 0b
eb fe 66 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec 68 ba 14
RIP [<ffffffff811b66f1>] nfs_do_writepage+0x201/0x210
RSP <ffff88003c601a10>
---[ end trace 9a06d7f037e4429e ]---
uname -r:
2.6.35.3.x86_64.aufs
--------------------------------------------------------
It is a VM on qemu-kvm, 2GB RAM, 1 Virtual CPU,
Root filesystem is a copy-on-write AUFS, changes are written via NFS.
This machine runs always into this error on startup, after installing
Fedora 389 directory server.
We have seen this error also when memory was low, but this VM has plenty
memory free.
top:
Tasks: 56 total, 1 running, 55 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.4%us, 1.4%sy, 0.0%ni, 96.9%id, 1.0%wa, 0.0%hi, 0.2%si,
0.0%st
Mem: 2058768k total, 661556k used, 1397212k free, 157792k buffers
Swap: 0k total, 0k used, 0k free, 87844k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1 root 20 0 19284 1428 1160 S 0.0 0.1 0:00.39 init
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root 20 0 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0
4 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
5 root 20 0 0 0 0 S 0.0 0.0 0:00.01 events/0
6 root 20 0 0 0 0 S 0.0 0.0 0:00.00 cpuset
7 root 20 0 0 0 0 S 0.0 0.0 0:00.01 khelper
12 root 20 0 0 0 0 S 0.0 0.0 0:00.00 async/mgr
139 root 20 0 0 0 0 S 0.0 0.0 0:00.00 sync_supers
141 root 20 0 0 0 0 S 0.0 0.0 0:00.00 bdi-default
143 root 20 0 0 0 0 S 0.0 0.0 0:00.09 kblockd/0
145 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kacpid
146 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kacpi_notify
147 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kacpi_hotplug
219 root 20 0 0 0 0 S 0.0 0.0 0:00.00 khubd
222 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kseriod
246 root 20 0 0 0 0 S 0.0 0.0 0:00.19 rpciod/0
247 root 20 0 0 0 0 S 0.0 0.0 0:00.00
kvm-irqfd-clean
266 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kswapd0
267 root 20 0 0 0 0 S 0.0 0.0 0:00.00 aio/0
268 root 20 0 0 0 0 S 0.0 0.0 0:00.05 nfsiod
270 root 20 0 0 0 0 S 0.0 0.0 0:00.00 aufsd/0
271 root 20 0 0 0 0 S 0.0 0.0 0:00.03 aufsd_pre/0
272 root 20 0 0 0 0 S 0.0 0.0 0:00.00 crypto/0
460 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kpsmoused
466 root 20 0 0 0 0 S 0.0 0.0 0:00.00
usbhid_resumer
932 root 20 0 0 0 0 S 0.0 0.0 0:00.00 jbd2/vda1-8
933 root 20 0 0 0 0 S 0.0 0.0 0:00.00
ext4-dio-unwrit
1061 root 16 -4 11004 1056 320 S 0.0 0.1 0:00.02 udevd
1837 root 20 0 9084 596 124 S 0.0 0.0 0:00.00 dhclient
1966 root 20 0 238m 1420 852 S 0.0 0.1 0:00.04 rsyslogd
1995 rpc 20 0 18916 856 612 S 0.0 0.0 0:00.02 rpcbind
2025 rpcuser 20 0 23084 1128 844 S 0.0 0.1 0:00.00 rpc.statd
2146 root 20 0 185m 3484 1572 S 0.0 0.2 0:00.03 httpd.worker
2149 root 20 0 185m 2280 368 S 0.0 0.1 0:00.00 httpd.worker
2150 LDAP 20 0 777m 3804 1168 S 0.0 0.2 0:00.00 httpd.worker
2227 dbus 20 0 21464 908 624 S 0.0 0.0 0:00.00 dbus-daemon
--------------------------------------------------------
cat /proc/mounts:
rootfs / rootfs rw 0 0
/proc /proc proc rw,relatime 0 0
/sys /sys sysfs rw,relatime 0 0
udev /dev tmpfs rw,relatime,mode=755 0 0
devpts /dev/pts devpts rw,relatime,gid=5,mode=620 0 0
tmpfs /dev/shm tmpfs rw,relatime 0 0
/dev/vda1 /dev/ro ext4 ro,relatime,barrier=1,data=ordered 0 0
aufs / aufs rw,sync,noatime,si=92ba86936973eb7c 0 0
192.168.255.1:/dev/servers /dev/servers nfs
rw,sync,noatime,vers=3,rsize=32768,wsize=32768,namlen=255,hard,nolock,proto=udp,timeo=11,retrans=20,sec=sys,mountaddr=192.168.255.1,mountvers=3,mountport=49222,mountproto=udp,addr=192.168.255.1
0 0
/proc/bus/usb /proc/bus/usb usbfs rw,relatime 0 0
none /proc/sys/fs/binfmt_misc binfmt_misc rw,relatime 0 0
--------------------------------------------------------
We are ready create VMs for testing.
If you need more info, please ask.
Regards
David Mudrich
--
Mudrich Systems
David Mudrich Geschäftsführung / Executive
Tel/Fax +49 3907 775646
E-Mail dmudrich@xxxxxxxxxxxxxxxxxx
Web www.mudrichsystems.com <http://www.mudrichsystems.com>
Mudrich EDV David und Johannes Mudrich GbR
Bäckergang 1, 39638 Gardelegen, Germany
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