2008/1/20, Gabor MICSKO <gmicsko@gmail.com>:> Hi,
>
> uname -a: Linux btrfstest 2.6.24-4-generic #1 SMP Mon Jan 14 17:30:39
> UTC 2008 i686 GNU/Linux
>
> btrfs version: 0.11
>
> fs: /dev/sda5 on /mnt type btrfs (rw)
>
>
> root@btrfstest:/tmp# dd if=/dev/zero of=foobar bs=1024 count=100000
> 100000+0 records in
> 100000+0 records out
> 102400000 bytes (102 MB) copied, 15.5326 seconds, 6.6 MB/s
> root@btrfstest:/tmp# cp foobar /mnt/
> Segmentation fault
> root@btrfstest:/tmp# cat /proc/kmsg
> <1>[45260.686155] BUG: unable to handle kernel NULL pointer
dereference
> at virtual address 00000014
> <1>[45260.689084] printing eip: c0164ce1 *pde = 00000000
> <0>[45260.696988] Oops: 0000 [#1] SMP
> <4>[45260.699886] Modules linked in: sbs sbshc video output dock
battery
> btrfs libcrc32c lp loop ipv6 snd_ens1371 gameport snd_ac97_codec
> ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss
> snd_seq_midi snd_rawmidi parport_pc parport snd_seq_midi_event snd_seq
> evdev container snd_timer snd_seq_device serio_raw snd ac power_supply
> soundcore snd_page_alloc psmouse button i2c_piix4 i2c_core pcspkr shpchp
> pci_hotplug intel_agp agpgart ext3 jbd mbcache sg sr_mod cdrom sd_mod
> ata_generic floppy ata_piix pata_acpi pcnet32 mii libata BusLogic
> scsi_mod thermal processor fan fuse
> <4>[45260.760017]
> <4>[45260.761431] Pid: 4510, comm: cp Not tainted (2.6.24-4-generic
#1)
> <4>[45260.762595] EIP: 0060:[<c0164ce1>] EFLAGS: 00010206 CPU:
0
> <4>[45260.765053] EIP is at should_remove_suid+0x1/0x50
> <4>[45260.766213] EAX: 00000008 EBX: df252a18 ECX: ffffffff EDX:
> df8c2300
> <4>[45260.767372] ESI: 00001000 EDI: 00001000 EBP: 00001000 ESP:
> df491ec8
> <4>[45260.768540] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> <0>[45260.774702] Process cp (pid: 4510, ti=df490000 task=df8e50e0
> task.ti=df490000)
> <0>[45260.775943] Stack: df252a18 c0164d3c 00000000 00001000 e0ac10b7
> 00000000 00000000 00000000
> <0>[45260.783051] 00000001 ffffffff df8c2f00 bfed6000 df8c2300
> 00000000 00000000 00000000
> <0>[45260.797161] ffffffea df253558 dfa95000 df8e50e0 c0141ac0
> df491f1c df491f1c 00001000
> <0>[45260.803967] Call Trace:
> <0>[45260.806749] [<c0164d3c>] remove_suid+0xc/0x50
> <0>[45260.808843] [<e0ac10b7>] btrfs_file_write+0x187/0x7c0
[btrfs]
> <0>[45260.815565] [<c0141ac0>]
autoremove_wake_function+0x0/0x40
> <0>[45260.817299] [<e0ac0f30>] btrfs_file_write+0x0/0x7c0
[btrfs]
> <0>[45260.819050] [<c0189919>] vfs_write+0xb9/0x170
> <0>[45260.820691] [<c018a051>] sys_write+0x41/0x70
> <0>[45260.822306] [<c01053a2>] sysenter_past_esp+0x6b/0xa9
> <0>[45260.824497] ======================> <0>[45260.825628]
Code: eb d2 90 8d b4 26 00 00 00 00 53 80 ce 02 83 ec
> 30 89 c3 89 14 24 8b 13 89 e1 8b 40 04 e8 58 92 03 00 83 c4 30 5b c3 8d
> 76 00 53 <8b> 40 0c 0f b7 50 6a 89 d0 25 00 08 00 00 83 f8 01 19 db
81
> e2
> <0>[45260.896130] EIP: [<c0164ce1>] should_remove_suid+0x1/0x50
SS:ESP
> 0068:df491ec8
> <4>[45260.900627] ---[ end trace fc3d3ba8484238ec ]---
>
>
> --
> Gabor MICSKO <gmicsko@gmail.com>
>
>
Maybe it's due to the apparmor stuff. Is there any warning when
compiling btrfs ?
Regards
YZ