Hi,
While troubleshooting a DFS issue, I hit a kernel panic:
foxdft13 = DFS root
foxdft08 = file server, serving "Global" share
# mount -t cifs //foxdft13.fox.local/company /mnt/bla/ -o
credentials=/creds,sec=ntlmv2,dom=fox
# ls -la /mnt/bla/Global/
fs/cifs/inode.c: CIFS VFS: in cifs_revalidate_dentry as Xid: 603 with
uid: 0
fs/cifs/inode.c: Revalidate: \\foxdft13.fox.local\company\Global inode
0xe289aaac count 1 dentry: 0xda8c53b8 d_time 151744140 jiffies 151765235
fs/cifs/inode.c: Getting info on \\foxdft13.fox.local\company\Global
fs/cifs/transport.c: For smb_command 50
fs/cifs/transport.c: Sending smb: total_len 148
fs/cifs/connect.c: rfc1002 length 0x27
fs/cifs/connect.c: invalid transact2 word count
Status code returned 0xc0000257 NT_STATUS_PATH_NOT_COVERED
fs/cifs/netmisc.c: Mapping smb error code 3 to POSIX err -66
fs/cifs/cifssmb.c: Send error in QPathInfo = -66
fs/cifs/inode.c: creating fake fattr for DFS referral
fs/cifs/inode.c: cifs_revalidate_cache: revalidating inode 62
fs/cifs/inode.c: cifs_revalidate_cache: invalidating inode 62 mapping
fs/cifs/inode.c: inode 0xe289aaac old_time=151744140 new_time=151765237
fs/cifs/inode.c: CIFS VFS: leaving cifs_revalidate_dentry (xid = 603) rc
= 0
fs/cifs/cifs_dfs_ref.c: in cifs_dfs_follow_mountpoint
fs/cifs/cifs_dfs_ref.c: CIFS VFS: in cifs_dfs_follow_mountpoint as Xid:
604 with uid: 0
fs/cifs/cifssmb.c: In GetDFSRefer the path
\foxdft13.fox.local\company\Global
fs/cifs/transport.c: For smb_command 50
fs/cifs/transport.c: Sending smb: total_len 144
fs/cifs/connect.c: rfc1002 length 0x124
fs/cifs/cifssmb.c: Decoding GetDFSRefer response BCC: 233 Offset 56
fs/cifs/cifssmb.c: num_referrals: 1 dfs flags: 0x2 ...
fs/cifs/cifs_dfs_ref.c: DFS: ref path: \foxdft13.fox.local\company\Global
fs/cifs/cifs_dfs_ref.c: DFS: node path: \foxdft08\company\Global
fs/cifs/cifs_dfs_ref.c: DFS: fl: 2, srv_type: 0
fs/cifs/cifs_dfs_ref.c: DFS: ref_flags: 0, path_consumed: 34
fs/cifs/dns_resolve.c: dns_resolve_server_name_to_ip: resolved: foxdft08
to 10.0.0.72
fs/cifs/cifsfs.c: Devname: \\foxdft08\company flags: 0
fs/cifs/connect.c: CIFS VFS: in cifs_mount as Xid: 605 with uid: 0
fs/cifs/connect.c: Domain name set
fs/cifs/connect.c: prefix path /Global
fs/cifs/connect.c: Username: vmtest
fs/cifs/connect.c: UNC: \\foxdft08\company ip: 10.0.0.72
fs/cifs/connect.c: Existing tcp session with server found
fs/cifs/connect.c: CIFS VFS: in cifs_get_smb_ses as Xid: 606 with uid: 0
fs/cifs/connect.c: Existing smb sess found (status=1)
fs/cifs/connect.c: CIFS VFS: leaving cifs_get_smb_ses (xid = 606) rc = 0
fs/cifs/connect.c: file mode: 0x1ed dir mode: 0x1ed
fs/cifs/connect.c: Found match on UNC path
fs/cifs/connect.c: cifs_put_smb_ses: ses_count=2
fs/cifs/cifssmb.c: In QFSDeviceInfo
fs/cifs/transport.c: For smb_command 50
fs/cifs/transport.c: Sending smb: total_len 72
fs/cifs/connect.c: rfc1002 length 0x44
fs/cifs/cifssmb.c: In QFSAttributeInfo
fs/cifs/transport.c: For smb_command 50
fs/cifs/transport.c: Sending smb: total_len 72
fs/cifs/connect.c: rfc1002 length 0x50
BUG: unable to handle kernel NULL pointer dereference at 0000001c
IP: [<f909e327>] cifs_sb_master_tcon+0x3/0x7 [cifs]
*pde = 00000000
Oops: 0000 [#2] SMP
last sysfs file: /sys/devices/virtual/bdi/cifs-183/uevent
Modules linked in: cifs hmac nls_utf8 nls_base xfs exportfs loop
parport_pc snd_pcm parport tpm_tis tpm tpm_bios snd_timer snd soundcore
psmouse snd_page_alloc pcspkr evdev serio_raw i2c_piix4 shpchp i2c_core
pci_hotplug ac container processor thermal_sys button ext3 jbd mbcache
sd_mod crc_t10dif ide_cd_mod cdrom ata_generic ata_piix libata floppy
e1000 mptspi piix mptscsih mptbase scsi_transport_spi ide_core scsi_mod
[last unloaded: cifs]
Pid: 1504, comm: ls Tainted: G D 2.6.37-rc3 #1 440BX Desktop
Reference Platform/VMware Virtual Platform
EIP: 0060:[<f909e327>] EFLAGS: 00010292 CPU: 2
EIP is at cifs_sb_master_tcon+0x3/0x7 [cifs]
EAX: 00000000 EBX: f7031400 ECX: 00000000 EDX: 00000000
ESI: 00000000 EDI: f70c4000 EBP: f70c4000 ESP: f37c7d30
DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process ls (pid: 1504, ti=f37c6000 task=f50a69a0 task.ti=f37c6000)
Stack:
f90aa3ab 0000004c 00000007 f4380000 f7031400 00000000 f7031100 f70c4000
f90a2a79 f70c5200 c127c977 f72affff f501b600 0000025d ef110540 f72a6718
f70c5e00 00000000 ef110540 f50a69a0 f50a69a0 f70c4174 f72a6728 00007d9c
Call Trace:
[<f90aa3ab>] ? cifs_build_path_to_root+0x17/0xe5 [cifs]
[<f90a2a79>] ? cifs_mount+0x19f0/0x1e3f [cifs]
[<c127c977>] ? _raw_spin_lock_bh+0x8/0x1e
[<f90958f9>] ? cifs_do_mount+0x110/0x247 [cifs]
[<f90957e9>] ? cifs_do_mount+0x0/0x247 [cifs]
[<c10b8331>] ? vfs_kern_mount+0x9f/0x185
[<f90b4c03>] ? cifs_dfs_follow_mountpoint+0x233/0x3cc [cifs]
[<c10bebab>] ? do_follow_link+0xb6/0x1b1
[<c10bef38>] ? link_path_walk+0x292/0x372
[<c10bf0da>] ? path_walk+0x4f/0xae
[<c10bf20b>] ? do_path_lookup+0x1f/0x69
[<c10bfaa8>] ? user_path_at+0x37/0x5f
[<c1098b0d>] ? vma_prio_tree_insert+0x17/0x2d
[<c10b99b1>] ? vfs_fstatat+0x2a/0x50
[<c10b9a18>] ? vfs_lstat+0x13/0x15
[<c10b9a29>] ? sys_lstat64+0xf/0x23
[<c1052a6c>] ? sys_futex+0xfe/0x112
[<c10b503c>] ? filp_close+0x4e/0x54
[<c127f339>] ? do_page_fault+0x0/0x36b
[<c1002f9f>] ? sysenter_do_call+0x12/0x28
Code: c8 59 5f 39 ee 0f 8c 49 ff ff ff 8b 44 24 60 65 33 05 14 00 00 00
74 05 e8 3f 0c f9 c7 83 c4 64 5b 5e 5f 5d c3 90 90 90 8b 40 08 <8b> 40 1c
c3 55 89 c5 83 3d a4 47 3b c1 00 57 89 d7 56 89 ce 53
EIP: [<f909e327>] cifs_sb_master_tcon+0x3/0x7 [cifs] SS:ESP 0068:f37c7d30
CR2: 000000000000001c
---[ end trace 9642afdeb896e709 ]---
Any ideas?
Regards,
--
Robbert
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