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    SubjectRe: [OOPS] 3.0-rc1 cifs
    On Sun, 12 Jun 2011 00:31:47 +0200 (CEST)
    Martijn Uffing <mp3project@sarijopen.student.utwente.nl> wrote:

    >
    >
    >
    > <snip>
    > >
    > > Yep, mea culpa. This patch should fix it. Martin, can you test it?
    > > Anyone else have comments?
    > >
    > > Thanks...
    >
    >
    > Unfortunately, I have to quote Britney: "Oops! I did it again"
    > Well, not entirely true, the OOPS changed into a BUG, but my samba mount
    > still doesn't work.
    >
    > The OOPS to BUG has a interesting diff. Don't know if it really matters,
    > but some more info about my samba setup. Never such a thing as to much
    > info. Note, the SAMBA hostname and DNS hostname of the server are
    > NOT the same.
    >
    >
    > ######## <samba setup> #############
    > SERVER:
    > -DNS_hostname : sarijopen.student.utwente.nl
    > -SAMBA_hostname : duckman-tm
    > -ipv4 only :
    > testparm -v|grep wins :
    > name resolve order = lmhosts wins host bcast
    > max wins ttl = 518400
    > min wins ttl = 21600
    > wins proxy = No
    > wins server = 130.89.4.21, 130.89.4.22
    > wins support = No
    > wins hook =
    > No Domain Controller or anything. This a student LAN of circa 1000
    > computers where you can set your SAMBA hostname and workgroup to anything you like. Browse masters
    > of ad hoc workgroups are decided by elections. Only the WINS servers are
    > provided as a service of the IT department. I dont have very deep
    > knowledge of samba, but when I read some specs, my first thought was "this stuff is NOT designed for the way we use it".
    > However, it works. (Well, with a s*#%load of legitimate samba broadcast
    > traffic)
    >
    > CLIENT:
    > -DNS_hostname = xxxx.student.utwente.nl
    > -SAMBA_hostname = xxxx
    > -ipv4/ipv6 dual stack
    > -fstab: //sarijopen.student.utwente.nl/sysadmin /home/XXXX/docs_sysadmin
    > cifs guest,uid=XXXX,gid=XXXX,users,auto,nounix,nobrl 0
    > 0
    > ######### </samba setup> #########
    >
    >
    >
    > diff -up OOPS BUG
    >
    > 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: [<ffffffffa041e286>] CIFSTCon+0xf6/0x4d0 [cifs]
    > -PGD 127393067 PUD 129c80067 PMD 0
    > -Oops: 0000 [#1] SMP
    > +CIFS VFS: dns_resolve_server_name_to_ip: unable to resolve:
    > sarijopen.student.utwente.nl
    > +CIFS VFS: cifs_compose_mount_options: Failed to resolve server part of
    > \\sarijopen.student.utwente.nl\sysadmin to IP: -2
    > +------------[ cut here ]------------
    > +kernel BUG at mm/slab.c:501!
    > +invalid opcode: 0000 [#1] SMP
    >
    > BUG:
    >
    > 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
    > CIFS VFS: dns_resolve_server_name_to_ip: unable to resolve:
    > sarijopen.student.utwente.nl
    > CIFS VFS: cifs_compose_mount_options: Failed to resolve server part of
    > \\sarijopen.student.utwente.nl\sysadmin to IP: -2
    > ------------[ cut here ]------------
    > kernel BUG at mm/slab.c:501!
    > invalid opcode: 0000 [#1] SMP
    > CPU 0
    > 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 usbhid
    > sr_mod cdrom hid evdev pata_marvell sky2 skge snd_hda_codec_hdmi
    > snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_hwdep snd_pcm tpm_tis
    > snd_seq_midi snd_rawmidi tpm snd_seq_midi_event pcspkr tpm_bios snd_seq
    > uhci_hcd snd_timer snd_seq_device snd i2c_i801 i2c_core ehci_hcd intel_agp
    > intel_gtt soundcore snd_page_alloc
    >
    > Pid: 2085, comm: mount.cifs Not tainted 3.0.0-rc1-debug-patched #1 System
    > manufacturer P5Q-E/P5Q-E
    > RIP: 0010:[<ffffffff810d19f4>] [<ffffffff810d19f4>] kfree+0x134/0x170
    > RSP: 0018:ffff880129251cc8 EFLAGS: 00010046
    > RAX: ffffea000070f420 RBX: ffff8801287e2e00 RCX: ffff88012f3c8800
    > RDX: 4000000000000000 RSI: 00000000000000d0 RDI: ffffffffa045cebb
    > RBP: ffff880129251d18 R08: b018000000000000 R09: 000000000000000a
    > R10: 0000000000000006 R11: dead000000200200 R12: ffffffffa045cebb
    > R13: 0000000000000282 R14: ffff88012a903400 R15: ffff88012a903800
    > FS: 00007f6d20b9f700(0000) GS:ffff88012fc00000(0000)
    > knlGS:0000000000000000
    > CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    > CR2: 00007fb9903dfc58 CR3: 0000000128b43000 CR4: 00000000000406f0
    > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    > Process mount.cifs (pid: 2085, threadinfo ffff880129250000, task
    > ffff88012aba6100)
    > Stack:
    > ffff880129251c5c ffffffff810ec545 ffff88012f3c8800 ffff88010f876d10
    > ffff88012f3c8800 ffff8801287e2e00 ffff880129251d80 ffff88010f876d10
    > ffff88012a903400 ffff88012a903800 ffff880129251d38 ffffffffa043d19f
    > Call Trace:
    > [<ffffffff810ec545>] ? __d_instantiate+0x85/0xf0
    > [<ffffffffa043d19f>] cifs_cleanup_volume_info+0x1f/0x70 [cifs]
    > [<ffffffffa043123b>] cifs_do_mount+0x11b/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: c8 44 01 09 4c 8b 45 c0 41 fe 46 40 8b 13 4b 8d 34 38 29 c2 4c 89 c7
    > 89 13 89 d2 48 c1 e2 03 e8 53 d2 0c 00 8b 03 e9 47 ff ff ff <0f> 0b eb fe
    > 48 8b 40 10 e9 16 ff ff ff 4c 8d 43 18 89 c2 4c 89
    > RIP [<ffffffff810d19f4>] kfree+0x134/0x170
    > RSP <ffff880129251cc8>
    > ---[ end trace cffbbd6be8c5a0f3 ]---
    >
    >
    >
    > So, we're from OOPS to BUG. I tried gdb, but it won't decode the
    > kfree+0x134 into something, which I could with the real OOPS.
    > Some pointers how I can help with gdb?
    >
    > http://wiki.samba.org/index.php/LinuxCIFS_troubleshooting#Oopses mentions
    > only OOPS, no BUG.
    >
    > Greetz Martijn
    > (BTW, I will mostly be of the net a couple of days, so my reply's can take
    > a while)
    >

    (cc'ing Pavel)

    Ok, I've been able to reproduce on -rc2 as well, simply by mounting
    with -o sec=none. Pavel, I'm pretty sure this got broken by commit
    724d9f1cfb. That patch doesn't handle the "null user" case correctly.
    There are probably several different ways to fix it:


    [ 249.418776] ------------[ cut here ]------------
    [ 249.419050] kernel BUG at mm/slub.c:2948!
    [ 249.419050] invalid opcode: 0000 [#1] SMP
    [ 249.419050] CPU 1
    [ 249.419050] Modules linked in: des_generic md4 nls_utf8 cifs fscache sunrpc ipx p8022 psnap llc p8023 rose ax25 joydev i2c_piix4 i2c_core virtio_balloon virtio_net virtio_blk [last unloaded: cifs]
    [ 249.419050]
    [ 249.419050] Pid: 1058, comm: mount.cifs Not tainted 3.0-0.rc2.git0.2.fc16.x86_64 #1 Bochs Bochs
    [ 249.419050] RIP: 0010:[<ffffffff81126249>] [<ffffffff81126249>] kfree+0x60/0xfc
    [ 249.419050] RSP: 0018:ffff88003ba2bce8 EFLAGS: 00010246
    [ 249.419050] RAX: 0020000000000000 RBX: ffffffffa013d46d RCX: ffff880034380930
    [ 249.419050] RDX: 0020000000000000 RSI: ffff8800314a4ea0 RDI: ffffffffa013d46d
    [ 249.419050] RBP: ffff88003ba2bd08 R08: ffff88003e002500 R09: 000000000000005a
    [ 249.419050] R10: ffffffff82421ed0 R11: 00000000000003a7 R12: ffffea0000704558
    [ 249.419050] R13: ffff88002f1a8050 R14: ffff88003140c2d0 R15: ffff88003a40d330
    [ 249.419050] FS: 00007f89290dc740(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000
    [ 249.419050] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    [ 249.419050] CR2: 00007f804783a240 CR3: 000000003aea9000 CR4: 00000000000006e0
    [ 249.419050] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    [ 249.419050] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    [ 249.419050] Process mount.cifs (pid: 1058, threadinfo ffff88003ba2a000, task ffff8800314a47a0)
    [ 249.419050] Stack:
    [ 249.419050] ffff88003c312000 ffff88003ba2bd70 ffff88002f1a8050 ffff88003140c2d0
    [ 249.419050] ffff88003ba2bd28 ffffffffa011e1a7 ffff88003ba1c240 ffff88003140c240
    [ 249.419050] ffff88003ba2bda8 ffffffffa0112107 ffff88003ba2bd98 ffff880034380930
    [ 249.419050] Call Trace:
    [ 249.419050] [<ffffffffa011e1a7>] cifs_cleanup_volume_info+0x24/0x72 [cifs]
    [ 249.419050] [<ffffffffa0112107>] cifs_do_mount+0x34e/0x364 [cifs]
    [ 249.419050] [<ffffffff8113a2dd>] mount_fs+0x69/0x158
    [ 249.419050] [<ffffffff81103e6c>] ? __alloc_percpu+0x10/0x12
    [ 249.419050] [<ffffffff8114f35e>] vfs_kern_mount+0x63/0xa0
    [ 249.419050] [<ffffffff81150032>] do_kern_mount+0x4d/0xdf
    [ 249.419050] [<ffffffff811516c8>] do_mount+0x63c/0x69f
    [ 249.419050] [<ffffffff811519ac>] sys_mount+0x88/0xc2
    [ 249.419050] [<ffffffff814fb002>] system_call_fastpath+0x16/0x1b
    [ 249.419050] Code: e9 ae 00 00 00 48 83 fb 10 0f 86 af 00 00 00 48 89 df e8 11 dd ff ff 49 89 c4 48 8b 00 a8 80 75 19 49 f7 04 24 00 c0 00 00 75 02 <0f> 0b 4c 89 e7 e8 78 e1 fc ff e9 84 00 00 00 4d 8b 6c 24 10 48
    [ 249.419050] RIP [<ffffffff81126249>] kfree+0x60/0xfc
    [ 249.419050] RSP <ffff88003ba2bce8>
    [ 249.474238] ---[ end trace 48c6ff1e268f2f6a ]---


    --
    Jeff Layton <jlayton@redhat.com>


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