kernel oops under heavy load

[Michael Hanke]

Hej!

I have a serious problem with arla under heavy load. I tried to copy a 
directory tree (slightly less than 1GB) to the local file system. After 
having transferred a few hundred MB, arlad died. The crash is reproducible, 
but the number of sucessfully transferred data varies.

The command:

cd <afs-directory> ; tar cf - . | ( cd /usr/local ; tar xf - )

My attempts:
1. SuSE Linux 9.1, kernel 2.6.5-7.147(SuSE), arla arla-0.36-5.src.rpm
(no messages in the log when arlad died)
2. kernel 2.6.11 (vanilla), arla 0.38
Here, I received a kernel oops:

Mar  2 18:36:46 struppi kernel: Unable to handle kernel NULL pointer 
dereference at virtual address 00000000                                                    
Mar  2 18:36:46 struppi kernel:  printing eip:                                  
Mar  2 18:36:46 struppi kernel: 00000000                                        
Mar  2 18:36:46 struppi kernel: *pde = 00000000                                 
Mar  2 18:36:46 struppi kernel: Oops: 0000 [#1]                                 
Mar  2 18:36:46 struppi kernel: PREEMPT
Mar  2 18:36:46 struppi kernel: Modules linked in: nnpfs radeon drm edd joydev 
sg st sd_mod sr_mod scsi_mod ide_cd cdrom nvram usbserial parport_pc lp 
parport speedstep_lib snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device 
snd_pcm_oss freq_table snd_mixer_oss thermal processor fan button battery ac 
snd_intel8x0 snd_ac97_codec snd_pcm snd_timer snd soundcore snd_page_alloc 
hw_random uhci_hcd i2c_i801 i2c_core intel_agp agpgart ipv6 evdev af_packet 
3c59x mii usbcore nls_utf8 nls_cp437 vfat fat dm_mod reiserfs
Mar  2 18:36:46 struppi kernel: CPU:    0
Mar  2 18:36:46 struppi kernel: EIP:    0060:[<00000000>]    Not tainted VLI
Mar  2 18:36:46 struppi kernel: EFLAGS: 00210202   (2.6.11-050302)
Mar  2 18:36:46 struppi kernel: EIP is at 0x0
Mar  2 18:36:46 struppi kernel: eax: ee652658   ebx: ee480000   ecx: dfc27274   
edx: f8dbea80
Mar  2 18:36:46 struppi kernel: esi: ee652658   edi: dfc27200   ebp: d7db0d18   
esp: eec63ec8
Mar  2 18:36:46 struppi kernel: ds: 007b   es: 007b   ss: 0068
Mar  2 18:36:46 struppi kernel: Process arlad (pid: 12735, threadinfo=eec62000 
task=f72a4520)
Mar  2 18:36:46 struppi kernel: Stack: f9125d49 00000004 eec63f3c d7dd2008 
00000000 00000010 f91291a2 f912d480
Mar  2 18:36:46 struppi kernel:        00300006 000ec263 001f22a0 f9121c65 
ee480000 00000000 ffffffea f912291b
Mar  2 18:36:46 struppi kernel:        00002300 00000000 00000000 d83da380 
f6170d00 eec63f74 00000004 c01c1576
Mar  2 18:36:46 struppi kernel: Call Trace:
Mar  2 18:36:46 struppi kernel:  [pg0+953183561/1069413376] 
nnpfs_fh_to_dentry+0xd9/0x180 [nnpfs]
Mar  2 18:36:46 struppi kernel:  [<f9125d49>] nnpfs_fh_to_dentry+0xd9/0x180 
[nnpfs]
Mar  2 18:36:46 struppi kernel:  [pg0+953166949/1069413376] 
nnpfs_node_find+0x25/0x60 [nnpfs]
Mar  2 18:36:46 struppi kernel:  [<f9121c65>] nnpfs_node_find+0x25/0x60 
[nnpfs]
Mar  2 18:36:46 struppi kernel:  [pg0+953170203/1069413376] 
nnpfs_message_installdata+0x1eb/0x300 [nnpfs]
Mar  2 18:36:46 struppi kernel:  [<f912291b>] 
nnpfs_message_installdata+0x1eb/0x300 [nnpfs]
Mar  2 18:36:46 struppi kernel:  [selinux_file_permission+342/368] 
selinux_file_permission+0x156/0x170
Mar  2 18:36:46 struppi kernel:  [<c01c1576>] 
selinux_file_permission+0x156/0x170
Mar  2 18:36:46 struppi kernel:  [pg0+953157910/1069413376] 
nnpfs_devwrite+0x96/0x130 [nnpfs]
Mar  2 18:36:46 struppi kernel:  [<f911f916>] nnpfs_devwrite+0x96/0x130 
[nnpfs]
Mar  2 18:36:46 struppi kernel:  [vfs_write+212/304] vfs_write+0xd4/0x130
Mar  2 18:36:46 struppi kernel:  [<c015daa4>] vfs_write+0xd4/0x130
Mar  2 18:36:46 struppi kernel:  [sys_write+65/112] sys_write+0x41/0x70
Mar  2 18:36:46 struppi kernel:  [<c015dbb1>] sys_write+0x41/0x70
Mar  2 18:36:46 struppi kernel:  [sysenter_past_esp+82/117] 
sysenter_past_esp+0x52/0x75
Mar  2 18:36:46 struppi kernel:  [<c01030a9>] sysenter_past_esp+0x52/0x75
Mar  2 18:36:46 struppi kernel: Code:  Bad EIP value.
Mar  2 18:42:08 struppi kernel:  VFS: Busy inodes after unmount. Self-destruct 
in 5 seconds.  Have a nice day...


Are there any informations which you need additionally?

Michael