linux-kernel - Re: 2.6.34-rc3 BUG: unable to handle kernel NULL pointer dereference at 0000000000000048 cifs_show

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Date:	Sat, 26 Jun 2010 07:51:25 -0400
From:	Jeff Layton <jlayton@...ba.org>
To:	Andrew Hendry <andrew.hendry@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-cifs@...r.kernel.org
Subject: Re: 2.6.34-rc3 BUG: unable to handle kernel NULL pointer
 dereference  at 0000000000000048 cifs_show_options

On Sat, 26 Jun 2010 20:47:33 +1000
Andrew Hendry <andrew.hendry@...il.com> wrote:

> sorry, this should say 2.6.35-rc3
> 
> On Sat, Jun 26, 2010 at 8:46 PM, Andrew Hendry <andrew.hendry@...il.com> wrote:
> > From 2.6.34-rc3
> > Can't reliably reproduce, this was once after a resume over a few days
> > normal use.
> > The No response for cmds lines are normal as NAS takes a while to spin
> > up after resume.
> > System was unstable after message so couldn't collect more state
> >
> > [18446744028.633263] r8169 0000:0b:02.0: eth0: link up
> > [18446744039.623540] eth0: no IPv6 routers present
> > [18446744041.684522] CIFS VFS: No response for cmd 117 mid 21812
> > [18446744041.684561] CIFS VFS: cifs_mount failed w/return code = -11
> > [18446744056.674016] CIFS VFS: No response for cmd 114 mid 21813
> > [18446744056.674105] CIFS VFS: cifs_mount failed w/return code = -112
> > [18446744060.831668] BUG: unable to handle kernel NULL pointer
> > dereference at 0000000000000048
> > [18446744060.831680] IP: [<ffffffffa02982d9>]
> > cifs_show_options+0xf9/0x480 [cifs]
> > [18446744060.831699] PGD 2068fe067 PUD 2068fd067 PMD 0
> > [18446744060.831710] Oops: 0000 [#1] PREEMPT SMP
> > [18446744060.831720] last sysfs file:
> > /sys/devices/system/cpu/sched_smt_power_savings
> > [18446744060.831729] CPU 4
> > [18446744060.831733] Modules linked in: nls_cp437 cifs fbcon tileblit
> > font bitblit softcursor binfmt_misc kvm_intel kvm snd_hda_codec_via
> > snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss nouveau
> > snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi
> > snd_rawmidi snd_seq_midi_event ttm psmouse snd_seq drm_kms_helper
> > snd_timer snd_seq_device serio_raw snd drm asus_atk0110 soundcore
> > snd_page_alloc i2c_algo_bit usbhid hid ahci r8169 mii libahci
> > pata_jmicron
> > [18446744060.831821]
> > [18446744060.831829] Pid: 2206, comm: udisks-daemon Not tainted
> > 2.6.35-rc3 #6 P7P55D-E PRO/System Product Name
> > [18446744060.831836] RIP: 0010:[<ffffffffa02982d9>]
> > [<ffffffffa02982d9>] cifs_show_options+0xf9/0x480 [cifs]
> > [18446744060.831853] RSP: 0018:ffff880206913dc8  EFLAGS: 00010246
> > [18446744060.831860] RAX: 0000000000000000 RBX: ffff880184a7f140 RCX:
> > 0000000000000006
> > [18446744060.831867] RDX: 0000000000000006 RSI: 0000000000001000 RDI:
> > ffff880232fb0491
> > [18446744060.831874] RBP: ffff880206913df8 R08: 000000000000fff8 R09:
> > 0000000000000004
> > [18446744060.831881] R10: 0000000000000000 R11: 0000000000000000 R12:
> > ffff880231ad7400
> > [18446744060.831888] R13: ffff8802324d7400 R14: ffff8802324d6b00 R15:
> > 0000000000000000
> > [18446744060.831896] FS:  00007fdb12ceb7a0(0000)
> > GS:ffff880001e80000(0000) knlGS:0000000000000000
> > [18446744060.831904] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [18446744060.831910] CR2: 0000000000000048 CR3: 00000002068fb000 CR4:
> > 00000000000006e0
> > [18446744060.831917] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> > 0000000000000000
> > [18446744060.831924] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
> > 0000000000000400
> > [18446744060.831932] Process udisks-daemon (pid: 2206, threadinfo
> > ffff880206912000, task ffff880236ae1680)
> > [18446744060.831939] Stack:
> > [18446744060.831942]  ffff880206913df8 0000000000000000
> > ffff880184a7f140 ffff880184a7f140
> > [18446744060.831954] <0> ffff8802324d6b00 ffff880231ad6400
> > ffff880206913e68 ffffffff811575c7
> > [18446744060.831966] <0> ffffffff8161b450 0000000000000202
> > ffff8802318cac00 ffff88023fa6af00
> > [18446744060.831980] Call Trace:
> > [18446744060.831992]  [<ffffffff811575c7>] show_mountinfo+0x237/0x2b0
> > [18446744060.832004]  [<ffffffff8115bc1f>] seq_read+0x25f/0x3f0
> > [18446744060.832015]  [<ffffffff8113c9f5>] vfs_read+0xb5/0x180
> > [18446744060.832024]  [<ffffffff8113de8f>] ? fget_light+0x7f/0xc0
> > [18446744060.832033]  [<ffffffff8113d331>] sys_read+0x51/0x90
> > [18446744060.832045]  [<ffffffff8100b0f2>] system_call_fastpath+0x16/0x1b
> > [18446744060.832052] Code: 00 48 c7 c6 9a 7e 2c a0 48 89 df 31 c0 e8
> > 80 32 ec e0 49 8b 45 28 48 c7 c6 b0 7e 2c a0 4c 8b 78 40 48 89 df 31
> > c0 e8 67 32 ec e0 <41> 0f b7 47 48 66 83 f8 02 0f 84 98 01 00 00 66 83
> > f8 0a 0f 84
> > [18446744060.832164] RIP  [<ffffffffa02982d9>]
> > cifs_show_options+0xf9/0x480 [cifs]
> > [18446744060.832179]  RSP <ffff880206913dc8>
> > [18446744060.832184] CR2: 0000000000000048
> > [18446744060.832190] BUG: unable to handle kernel NULL pointer
> > dereference at 0000000000000048
> > [18446744060.832199] IP: [<ffffffffa02982d9>]
> > cifs_show_options+0xf9/0x480 [cifs]
> > [18446744060.832211] ---[ end trace d709801030e1a5a5 ]---
> > [18446744060.832217] PGD 233e17067 PUD 233e15067 PMD 0
> > [18446744060.832225] Oops: 0000 [#2] PREEMPT SMP
> > [18446744060.832232] last sysfs file:
> > /sys/devices/system/cpu/sched_smt_power_savings
> > [18446744060.832238] CPU 1
> > [18446744060.832241] Modules linked in: nls_cp437 cifs fbcon tileblit
> > font bitblit softcursor binfmt_misc kvm_intel kvm snd_hda_codec_via
> > snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss nouveau
> > snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi
> > snd_rawmidi snd_seq_midi_event ttm psmouse snd_seq drm_kms_helper
> > snd_timer snd_seq_device serio_raw snd drm asus_atk0110 soundcore
> > snd_page_alloc i2c_algo_bit usbhid hid ahci r8169 mii libahci
> > pata_jmicron
> > [18446744060.832321]
> > [18446744060.832327] Pid: 1356, comm: hald Tainted: G      D
> > 2.6.35-rc3 #6 P7P55D-E PRO/System Product Name
> > [18446744060.832334] RIP: 0010:[<ffffffffa02982d9>]
> > [<ffffffffa02982d9>] cifs_show_options+0xf9/0x480 [cifs]
> > [18446744060.832348] RSP: 0018:ffff880234ac3de8  EFLAGS: 00010246
> > [18446744060.832354] RAX: 0000000000000000 RBX: ffff88020afd0fc0 RCX:
> > 0000000000000006
> > [18446744060.832360] RDX: 0000000000000006 RSI: 0000000000001000 RDI:
> > ffff880232f7f3e5
> > [18446744060.832366] RBP: ffff880234ac3e18 R08: 000000000000fff8 R09:
> > 0000000000000004
> > [18446744060.832372] R10: 0000000000000000 R11: 0000000000000002 R12:
> > ffff880231ad7400
> > [18446744060.832378] R13: ffff8802324d7400 R14: ffff8802324d6b00 R15:
> > 0000000000000000
> > [18446744060.832384] FS:  00007f0b1c325700(0000)
> > GS:ffff880001e20000(0000) knlGS:0000000000000000
> > [18446744060.832390] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [18446744060.832396] CR2: 0000000000000048 CR3: 0000000235641000 CR4:
> > 00000000000006e0
> > [18446744060.832401] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> > 0000000000000000
> > [18446744060.832406] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
> > 0000000000000400
> > [18446744060.832413] Process hald (pid: 1356, threadinfo
> > ffff880234ac2000, task ffff880234bc9680)
> > [18446744060.832419] Stack:
> > [18446744060.832423]  ffff880234ac3e18 ffff88020afd0fc0
> > ffff8802324d6b00 ffff8802324d6b60
> > [18446744060.832433] <0> ffffffff8161b470 0000000000000000
> > ffff880234ac3e68 ffffffff81157752
> > [18446744060.832444] <0> ffff8802324d6b00 ffff88023f986000
> > ffff880234ac3e68 ffff88020afd0fc0
> > [18446744060.832458] Call Trace:
> > [18446744060.832467]  [<ffffffff81157752>] show_vfsmnt+0x112/0x150
> > [18446744060.832475]  [<ffffffff8115bc1f>] seq_read+0x25f/0x3f0
> > [18446744060.832484]  [<ffffffff8113c9f5>] vfs_read+0xb5/0x180
> > [18446744060.832492]  [<ffffffff8113de8f>] ? fget_light+0x7f/0xc0
> > [18446744060.832500]  [<ffffffff8113d331>] sys_read+0x51/0x90
> > [18446744060.832510]  [<ffffffff8100b0f2>] system_call_fastpath+0x16/0x1b
> > [18446744060.832515] Code: 00 48 c7 c6 9a 7e 2c a0 48 89 df 31 c0 e8
> > 80 32 ec e0 49 8b 45 28 48 c7 c6 b0 7e 2c a0 4c 8b 78 40 48 89 df 31
> > c0 e8 67 32 ec e0 <41> 0f b7 47 48 66 83 f8 02 0f 84 98 01 00 00 66 83
> > f8 0a 0f 84
> > [18446744060.832634] RIP  [<ffffffffa02982d9>]
> > cifs_show_options+0xf9/0x480 [cifs]
> > [18446744060.832647]  RSP <ffff880234ac3de8>
> > [18446744060.832651] CR2: 0000000000000048
> > [18446744060.832668] ---[ end trace d709801030e1a5a6 ]---
> >

(cc'ing new linux-cifs ML)

Thanks for the bug report. Would you be able to follow the directions
here? That should help us pinpoint the spot where it actually crashed:

http://wiki.samba.org/index.php/LinuxCIFS_troubleshooting#Oopses

Thanks!
-- 
Jeff Layton <jlayton@...ba.org>
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