Re: [Morphix-devel] kernel/unionfs bug (readdir) in 0.5pre5

[Eli M. <ma...@ne...>]

Meanwhile, till it is answered, I want to try a newer unionfs, or a
different filesystem; What should I do?

More detailed:

1. How can I upgrade the unionfs of my Morphix?
2. Can I have another filesystem inside?  i.e. ext2, for example,
   mounted somewhere in the middle of unionfs?

I wrote:
> 
> Bug in 0.5pre5: readdir() on unionfs fails in the kernel. The directory
> becomes locked, and following readdir() on it become non-killable (for
> example, "ls dir" or "cd dir; echo *"). kernel is 2.6.11.
> 
> Output of dmesg is following:
> =============================
> 
> ASSERTION FAILED: rdstate->uds_cookie < MAXRDCOOKIE at /usr/src/modules/unionfs/unionfs.h:256 (verify_rdstate_offset)
> Unable to handle kernel NULL pointer dereference at virtual address 00000000
>  printing eip:
> d56685c9
> *pde = 00000000
> Oops: 0002 [#1]
> Modules linked in: apm af_packet tsdev 8250_pnp evdev pcspkr intel_agp agpgart pcmcia yenta_socket rsrc_nonstatic pcmcia_core unionfs ext3 jbd usb_storage usbhid snd_seq_oss snd_seq_midi_event snd_seq snd_pcm_oss snd_mixer_oss snd_ens1371 snd_rawmidi
> snd_seq_device snd_ac97_codec snd_pcm snd_timer snd soundcore snd_page_alloc gameport mptscsih mptbase i2c_piix4 i2c_core pcnet32 mii sg parport_pc parport 8250 serial_core ohci1394 ieee1394 ohci_hcd uhci_hcd usbcore ide_scsi rtc cloop 3w_xxxx a100u2w
> tmscsim megaraid atp870u aha152x BusLogic aic7xxx ide_cd
> CPU:    0
> EIP:    0060:[<d56685c9>]    Not tainted VLI
> EFLAGS: 00010296   (2.6.11)
> EIP is at unionfs_filldir+0x179/0x230 [unionfs]
> eax: 00000079   ebx: c032914d   ecx: ca37feb0   edx: d56fcd20
> esi: c1c34680   edi: d5700cba   ebp: ca37ff3c   esp: ca37fec0
> ds: 007b   es: 007b   ss: 0068
> Process ls (pid: 13062, threadinfo=ca37e000 task=c851d0a0)
> Stack: 00000000 00000000 c450af34 c377c078 c5200a00 c5200a00 c016973d ca37ff3c
>        c032914d 00000001 00000000 00000000 00003425 00000004 c44fe870 d5668450
>        c5200a00 d25fa480 c015bdc1 c5200a00 ca37ff3c d5668450 c5200a00 c1c34680
> Call Trace:
>  [<c016973d>] dcache_readdir+0x13d/0x160
>  [<d5668450>] unionfs_filldir+0x0/0x230 [unionfs]
>  [<c015bdc1>] vfs_readdir+0x61/0x80
>  [<d5668450>] unionfs_filldir+0x0/0x230 [unionfs]
>  [<d56687c0>] unionfs_readdir+0x140/0x480 [unionfs]
>  [<d5668450>] unionfs_filldir+0x0/0x230 [unionfs]
>  [<c015c080>] filldir64+0x0/0x100
>  [<c015c080>] filldir64+0x0/0x100
>  [<c015bdc1>] vfs_readdir+0x61/0x80
>  [<c015c080>] filldir64+0x0/0x100
>  [<c015c1ed>] sys_getdents64+0x6d/0xb7
>  [<c015c080>] filldir64+0x0/0x100
>  [<c015b5cd>] sys_fcntl64+0x5d/0x80
>  [<c0102d77>] syscall_call+0x7/0xb
> Code: 85 ff 0f 84 61 ff ff ff eb 88 68 71 b0 6f d5 68 00 01 00 00 68 c0 cb 6f d5 68 20 d0 6f d5 68 20 cd 6f d5 e8 4a 00 ab ea 83 c4 14 <c6> 05 00 00 00 00 00 eb c8 68 71 b0 6f d5 68 ff 00 00 00 68 c0

-- 
Eli Marmor
ma...@ne...
Netmask (El-Mar) Internet Technologies Ltd.
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