Re: [Dazuko-help] Kernel Oops in dazukofs_lookup()

[Lino Sanfilippo]

Peter Radig wrote:
> OpenSUSE 11.1 with kernel 2.6.27.23-0.1-default
>
> dazukofs coming with antivir-server-prof-3.0.5-0 (i.e. 3.0.0-rc4)
>
>  
>
> The following kernel oops happened on my system:
>
>  
>
> kernel BUG at include/linux/dcache.h:329!
>
> invalid opcode: 0000 [1] SMP
>
> last sysfs file: /sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
>
> CPU 5
>
> Modules linked in: dazukofs(N) nls_iso8859_1 nls_cp437 vfat fat 
> usb_storage nfsd lockd nfs_acl auth_rpcgss sunrpc exportfs bluetooth 
> af_packet ppdev vmnet(N) parport_pc parport vmci(N) vmmon(N) 
> iscsi_trgt(N) crc32c libcrc32c w83793(N) hwmon_vid capidrv isdn slhc 
> fcpci(PN) capi capifs kernelcapi microcode fuse loop dm_mod osst st 
> iTCO_wdt iTCO_vendor_support shpchp button sr_mod rtc_cmos i2c_i801 
> rtc_core rtc_lib i2c_core cdrom pci_hotplug pcspkr e1000e sg raid456 
> async_xor async_memcpy async_tx xor raid0 ehci_hcd uhci_hcd usbcore 
> sd_mod crc_t10dif pata_marvell edd raid1 ext3 mbcache jbd fan 3w_9xxx 
> ide_pci_generic piix ide_core ata_generic ata_piix ahci libata dock 
> aic79xx scsi_transport_spi scsi_mod thermal processor thermal_sys hwmon
>
> Supported: No
>
> Pid: 901, comm: smbd Tainted: P          2.6.27.23-0.1-default #1
>
> RIP: 0010:[<ffffffff802b82c3>]  [<ffffffff802b82c3>] 
> __follow_mount+0x54/0x7a
>
> RSP: 0018:ffff8806bbcc9a88  EFLAGS: 00010246
>
> RAX: ffff8807dd6ab3c0 RBX: ffff88081cf552c0 RCX: 0000000000000002
>
> RDX: ffff8806bbcc9e98 RSI: 0000000000000001 RDI: ffff8807dd51dcb0
>
> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
>
> R10: ffff8807fecd8a1c R11: ffffffff803319e8 R12: ffff8806bbcc9b18
>
> R13: ffff8806bbcc9b18 R14: ffff8806bbcc9b08 R15: ffff880816948e80
>
> FS:  00007fac916cc710(0000) GS:ffff88081ce34ec0(0000) 
> knlGS:0000000000000000
>
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>
> CR2: 00007fff99ce4e80 CR3: 00000006dc495000 CR4: 00000000000006e0
>
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>
> Process smbd (pid: 901, threadinfo ffff8806bbcc8000, task 
> ffff88064411c340)
>
> Stack:  ffff8807dd51dcb0 ffff8806bbcc9bc8 ffff8806bbcc9bc8 
> ffffffff802b85c4
>
>  ffffffff80a2e6a0 0000000000000000 ffff8806bbcc9bc8 ffff8807ea888d58
>
>  ffff8807bd8e1e40 ffff880816948e80 ffff8807fecd8a21 ffffffff802bab49
>
> Call Trace:
>
>  [<ffffffff802b85c4>] do_lookup+0x4f/0xb6
>
>  [<ffffffff802bab49>] __link_path_walk+0x904/0xd68
>
>  [<ffffffff802bb178>] path_walk+0x5e/0xb9
>
>  [<ffffffff802bbe86>] vfs_path_lookup+0x51/0x90
>
>  [<ffffffffa04ba3be>] dazukofs_lookup+0xda/0x2ec [dazukofs]
>
>  [<ffffffff802b84e4>] real_lookup+0x7e/0x10f
>
>  [<ffffffff802b85d8>] do_lookup+0x63/0xb6
>
>  [<ffffffff802bab49>] __link_path_walk+0x904/0xd68
>
>  [<ffffffff802bb178>] path_walk+0x5e/0xb9
>
>  [<ffffffff802bb335>] do_path_lookup+0x162/0x1b9
>
>  [<ffffffff802bbccf>] user_path_at+0x48/0x79
>
>  [<ffffffff802b4722>] vfs_stat_fd+0x18/0x44
>
>  [<ffffffff802b47aa>] sys_newstat+0x19/0x31
>
>  [<ffffffff8020bfbb>] system_call_fastpath+0x16/0x1b
>
>  [<00007fac8dbcb145>] 0x7fac8dbcb145
>
>  
>
>  
>
> Code: 18 49 8b 3c 24 48 85 ff 74 0f c7 87 cc 00 00 00 00 00 00 00 e8 
> 48 f5 00 00 49 89 1c 24 48 8b 43 20 48 85 c0 74 0c 83 38 00 75 04 <0f> 
> 0b eb fe f0 ff 00 49 89 44 24 08 bd 01 00 00 00 49 8b 74 24
>
> RIP  [<ffffffff802b82c3>] __follow_mount+0x54/0x7a
>
>  RSP <ffff8806bbcc9a88>
>
> ---[ end trace 763126df9862cc09 ]---
>
> ------------------------------------------------------------------------
>
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>   
Hi Peter,

thanks for reporting this bug.
This looks to me like a known bug that occurs if one dazukofs is mounted 
over
more than one filesystems and you try to access a file for which 
dazukofs has
to cross the boundary of both underlaying filesystems.
Could you please tell if it was a situation like this that triggered the 
bug or
else, under which circumstances this bug occured
(i.e. where and how often has dazukofs been mounted, what action has 
triggered
that bug)?

Thx,

Lino Sanfilippo



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