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Message-ID: <BANLkTimq2xjJq6g3mDX2Oy-scrp84TGLiw@mail.gmail.com> Date: Thu, 9 Jun 2011 15:53:38 -0700 From: Connor Hansen <cmdkhh@...il.com> To: Jeff Layton <jlayton@...hat.com> Cc: Martijn Uffing <mp3project@...ijopen.student.utwente.nl>, linux-cifs@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [OOPS] 3.0-rc1 cifs On Thu, Jun 9, 2011 at 3:50 PM, Connor Hansen <cmdkhh@...il.com> wrote: > On Thu, Jun 9, 2011 at 3:30 PM, Jeff Layton <jlayton@...hat.com> wrote: >> On Thu, 9 Jun 2011 22:15:05 +0200 (CEST) >> Martijn Uffing <mp3project@...ijopen.student.utwente.nl> wrote: >> >>> >>> 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@...ad.swb.de). >>> 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 > > call in get_dfs_path() > rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage); > > function header for CIFSTCon > int CIFSTCon(unsigned int xid, struct cifs_ses *ses, > const char *tree, struct cifs_tcon *tcon, > const struct nls_table *nls_codepage) > > get_dfs_path() is passing struct cifs_tcon *tcon as NULL > > from config: CONFIG_CIFS_WEAK_PW_HASH=y > > in CIFSTCon > > #ifdef CONFIG_CIFS_WEAK_PW_HASH > 3222 if ((global_secflags & CIFSSEC_MAY_LANMAN) && > 3223 (ses->server->secType == LANMAN)) > 3224 calc_lanman_hash(tcon->password, > ses->server->cryptkey, > > in calc_lanman_hash tcon is dereferenced(tcon->password) without being > checked if null > > 3225 ses->server->sec_mode & > 3226 SECMODE_PW_ENCRYPT ? > true : false, > 3227 bcc_ptr); > 3228 else > 3229 #endif /* CIFS_WEAK_PW_HASH */ 3230 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey, 3231 bcc_ptr); and again here, so would occur even without CONFIG_CIFS_WEAK_PW_HASH set > > Connor > > >>> 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 ]--- >>> >> >> Thanks for the bug report, Martin. Can you do the following to get us a >> listing of the place where it fell down? >> >> http://wiki.samba.org/index.php/LinuxCIFS_troubleshooting#Oopses >> >> That should give us a better idea of what went wrong. >> >> Thanks, >> -- >> Jeff Layton <jlayton@...hat.com> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in >> the body of a message to majordomo@...r.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> Please read the FAQ at http://www.tux.org/lkml/ >> > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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