[OOPS] 3.0-rc1 cifs

[Martijn Uffing]

Ave People


I've got an oops with 3.0-rc1. (The same Oops also occurs with 3.0-rc2 and
the git snapshot of today linux-2.6-06e8684.)
The Oops occurs at boot time while the boot scripts try to automount a samba
share.

Last (tested)  working kernel	:	2.6.39
First (tested) oopsing kernel	:	3.0-rc1

I'm willing to try patches, and if it's needed, I can try to
git-bisect the kernel. However, I'm short on time and thought maybe somebody
already has some idea. I did a diff between 2.6.39/3.0-rc1 and there seems
to be a lot of code churn in cifs.

Details of client/server and the Oops attached. If there are any questions
please ask and CC: to my mail address. I'm not subscribed to
linux-cifs/linux-kernel

Martijn Uffing



CLIENT:

-Debian squeeze (64 bits)
-kernel vanilla 2.6.39 working   (core 2 duo)
-kernel vanilla 3.0-rc1 crashing (core 2 duo)
-fstab
 X.X.X.X/sysadmin /home/XXXX/docs_sysadmin	cifs	guest,uid=XXXX,gid=XXXX,users,auto,nounix,nobrl     0  0
-cat kernelconfig|grep CIFS
 CONFIG_CIFS=m
 CONFIG_CIFS_STATS=y
 # CONFIG_CIFS_STATS2 is not set
 CONFIG_CIFS_WEAK_PW_HASH=y
 CONFIG_CIFS_UPCALL=y
 # CONFIG_CIFS_XATTR is not set
 # CONFIG_CIFS_DEBUG2 is not set
 CONFIG_CIFS_DFS_UPCALL=y
 # CONFIG_CIFS_FSCACHE is not set
 CONFIG_CIFS_NFSD_EXPORT=y


SERVER:
-Debian etch (32 bits)
-kernel vanilla 2.6.27.59
-samba 3.0.24-6etch10
-samba share:
[sysadmin]
    path = /root/sysadmin/docs
    guest ok = yes
    guest only = yes
    force user = root
    writable = yes
    printable = no
    browseable = yes
    hosts deny = ALL
    hosts allow = X.X.X.X

OOPS:
Installing knfsd (copyright (C) 1996 okir@xxxxxxxxxxxx).
svc: failed to register lockdv1 RPC service (errno 97).
Registering the dns_resolver key type
CIFS VFS: default security mechanism requested.  The default security mechanism will be upgraded from ntlm to ntlmv2 in kernel release 2.6.41
BUG: unable to handle kernel NULL pointer dereference at 00000000000000a0
IP: [<ffffffffa0413286>] CIFSTCon+0xf6/0x4d0 [cifs]
PGD 12a9a1067 PUD 1270ef067 PMD 0 
Oops: 0000 [#1] SMP 
CPU 1 
Modules linked in: des_generic ecb md4 hmac nls_utf8 cifs dns_resolver nfsd nfs lockd fscache sunrpc xfs fuse radeon ttm drm_kms_helper drm i2c_algo_bit cfbcopyarea cfbimgblt cfbfillrect loop sg asus_atk0110 sr_mod cdrom usbhid hid pata_marvell sky2 skge evdev snd_hda_codec_hdmi snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi intel_agp intel_gtt snd_seq_midi_event snd_seq tpm_tis tpm snd_timer snd_seq_device i2c_i801 snd i2c_core uhci_hcd soundcore snd_page_alloc ehci_hcd tpm_bios pcspkr

Pid: 2065, comm: mount.cifs Not tainted 3.0.0-rc1 #1 System manufacturer P5Q-E/P5Q-E
RIP: 0010:[<ffffffffa0413286>]  [<ffffffffa0413286>] CIFSTCon+0xf6/0x4d0 [cifs]
RSP: 0018:ffff880127d17b48  EFLAGS: 00010282
RAX: ffff88012a905400 RBX: ffff880129dc4200 RCX: 0000000000000000
RDX: 0000000000000811 RSI: ffff88012a9055ea RDI: ffff88012a905578
RBP: ffff880127d17ba8 R08: 0000000000000005 R09: 0000000000000001
R10: ffff88012638d600 R11: ffffffffa00600c0 R12: ffff880128bd0140
R13: 0000000000000000 R14: ffff880128bd016f R15: 0000000000000000
FS:  00007f4cbf033700(0000) GS:ffff88012fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00000000000000a0 CR3: 000000012a9f1000 CR4: 00000000000406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process mount.cifs (pid: 2065, threadinfo ffff880127d16000, task ffff880127b26880)
Stack:
 ffff8801273a5900 ffff88012638d600 ffffffffa00600c0 0000000300000001
 ffff880127d17b78 ffff88012a905560 ffff880127d17ba8 ffff880127d17c74
 ffff880127d17c68 ffff880129dc4200 00000000fffffff4 ffff8801279b7f01
Call Trace:
 [<ffffffffa041479e>] get_dfs_path+0x11e/0x190 [cifs]
 [<ffffffffa041492c>] expand_dfs_referral+0x11c/0x220 [cifs]
 [<ffffffffa0425b55>] ? cifs_buf_release+0x15/0x20 [cifs]
 [<ffffffffa040d211>] ? CIFSSMBQFSAttributeInfo+0x1b1/0x260 [cifs]
 [<ffffffffa0415dc5>] cifs_mount+0x2c5/0x5d0 [cifs]
 [<ffffffff810b2c7d>] ? bdi_setup_and_register+0x7d/0xa0
 [<ffffffffa0408311>] cifs_do_mount+0x1f1/0x3b0 [cifs]
 [<ffffffff810db35b>] mount_fs+0x1b/0xd0
 [<ffffffff810f5c6e>] vfs_kern_mount+0x5e/0xd0
 [<ffffffff810f5d4d>] do_kern_mount+0x4d/0x110
 [<ffffffff810f732b>] do_mount+0x2cb/0x7d0
 [<ffffffff810f78c3>] sys_mount+0x93/0xe0
 [<ffffffff8138bdbb>] system_call_fastpath+0x16/0x1b
Code: b4 02 00 10 0f 84 e7 02 00 00 48 8b 73 40 8b be cc 01 00 00 85 ff 0f 84 de 02 00 00 4c 89 55 a8 4c 89 5d b0 48 81 c6 ea 01 00 00
 8b bd a0 00 00 00 4c 89 f2 e8 3b 37 01 00 4c 8b 5d b0 4c 8b 
RIP  [<ffffffffa0413286>] CIFSTCon+0xf6/0x4d0 [cifs]
 RSP <ffff880127d17b48>
CR2: 00000000000000a0
---[ end trace 64d92145e3df4829 ]---


-----------------------------------------
Ceterum censeo Carthaginem esse delendam

When it comes to procrastination, casting the first stone is definitely on
my TO DO list.


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