linux-kernel - [2.6.28] NULL pointer dereference at get

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Date:	Tue, 30 Dec 2008 21:53:51 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org
Subject: [2.6.28] NULL pointer dereference at get_stats()

Hello.

I got this on 2.6.28 .

CentOS 5.2 (gcc (GCC) 4.1.2 20071124 (Red Hat 4.1.2-42)) on VMware Workstation 6.5.1.

Config is at http://I-love.SAKURA.ne.jp/tmp/config-2.6.28 .
Full log is at http://I-love.SAKURA.ne.jp/tmp/messages6.txt .

----------------------------------------
BIOS EBDA/lowmem at: 0009f800/0009f800
Linux version 2.6.28 (root@...oyo) (gcc version 4.1.2 20071124 (Red Hat 4.1.2-42)) #1 SMP Tue Dec 30 21:11:13 JST 2008
KERNEL supported cpus:
  Intel GenuineIntel
  AMD AuthenticAMD
  NSC Geode by NSC
  Cyrix CyrixInstead
  Centaur CentaurHauls
  Transmeta GenuineTMx86
  Transmeta TransmetaCPU
  UMC UMC UMC UMC
(... snipped ...)
INIT: Entering runlevel: 3

Entering non-interactive startup
Applying Intel CPU microcode update: [  OK  ]

Starting sysstat:  Calling the system activity data collector (sadc): BUG: unable to handle kernel NULL pointer dereference at 00000004
IP: [<c055f2f5>] get_stats+0x1d/0x48
Oops: 0000 [#1] SMP 
last sysfs file: /sys/class/firmware/microcode/loading
Modules linked in: dm_mirror dm_region_hash dm_log dm_multipath dm_mod rfkill input_polldev sbs sbshc battery lp sg floppy ide_cd_mod cdrom serio_raw parport_pc parport rtc_cmos rtc_core ac button pcnet32 rtc_lib mii ata_piix i2c_piix4 libata i2c_core pcspkr mptspi mptscsih mptbase scsi_transport_spi sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd [last unloaded: microcode]

Pid: 2459, comm: sadc Not tainted (2.6.28 #1) VMware Virtual Platform
EIP: 0060:[<c055f2f5>] EFLAGS: 00010297 CPU: 0
EIP is at get_stats+0x1d/0x48
EAX: 00000000 EBX: df94c858 ECX: 00000001 EDX: 00000001
ESI: 00000000 EDI: 00000000 EBP: 206a4abf ESP: df163f0c
 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process sadc (pid: 2459, ti=df163000 task=df8c56d0 task.ti=df163000)
Stack:
 df94c800 dfb2ae40 df94c800 000000c8 c05bcc0f c066ee4c dfb2ae40 c04828b3
 00000400 b7f6b000 df1dcf00 dfb2ae60 00000000 00000001 00000000 00000000
 00000000 df8e4340 c04826ec fffffffb df1dcf00 c049f08d df163fa0 00000400
Call Trace:
 [<c05bcc0f>] dev_seq_show+0x1c/0x77
 [<c04828b3>] seq_read+0x1c7/0x2a0
 [<c04826ec>] seq_read+0x0/0x2a0
 [<c049f08d>] proc_reg_read+0x58/0x6b
 [<c049f035>] proc_reg_read+0x0/0x6b
 [<c0470444>] vfs_read+0x81/0xf4
 [<c0470720>] sys_read+0x3c/0x63
 [<c0403841>] sysenter_do_call+0x12/0x21
Code: ff 00 89 d8 e8 28 e6 05 00 31 c0 5b 5e c3 55 83 c9 ff 57 31 ff 56 31 f6 53 8b a8 6c 03 00 00 8d 58 58 eb 0c 89 e8 f7 d0 8b 04 88 <03> 78 04 03 30 89 c8 ba a0 9c 81 c0 e8 66 a1 f8 ff 83 f8 1f 89 
EIP: [<c055f2f5>] get_stats+0x1d/0x48 SS:ESP 0068:df163f0c
---[ end trace 8be667e49b995a38 ]---
/etc/rc3.d/S03sysstat: line 34:  2459 Segmentation fault      /usr/lib/sa/sadc -F -L -

[FAILED]

Starting background readahead: [  OK  ]

Bringing up loopback interface:  BUG: unable to handle kernel NULL pointer dereference at 00000004
IP: [<c055f2f5>] get_stats+0x1d/0x48
*pde = 00000000 
Oops: 0000 [#2] SMP 
last sysfs file: /sys/class/firmware/microcode/loading
Modules linked in: dm_mirror dm_region_hash dm_log dm_multipath dm_mod rfkill input_polldev sbs sbshc battery lp sg floppy ide_cd_mod cdrom serio_raw parport_pc parport rtc_cmos rtc_core ac button pcnet32 rtc_lib mii ata_piix i2c_piix4 libata i2c_core pcspkr mptspi mptscsih mptbase scsi_transport_spi sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd [last unloaded: microcode]

Pid: 2534, comm: ip Tainted: G      D    (2.6.28 #1) VMware Virtual Platform
EIP: 0060:[<c055f2f5>] EFLAGS: 00010297 CPU: 0
EIP is at get_stats+0x1d/0x48
EAX: 00000000 EBX: df94c858 ECX: 00000001 EDX: 00000001
ESI: 00000000 EDI: 00000000 EBP: 206a4abf ESP: df0b0c88
 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process ip (pid: 2534, ti=df0b0000 task=df8c7b60 task.ti=df0b0000)
Stack:
 df99a08c df94c964 deda4780 df94c800 c05c571a 0000000b df99a000 dfb2a940
 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00004034
 df94c800 dfb2a940 00000000 deda4780 c05c5fe7 000009e6 495a15d3 00000000
Call Trace:
 [<c05c571a>] rtnl_fill_ifinfo+0x2c9/0x498
 [<c05c5fe7>] rtnl_dump_ifinfo+0x40/0x69
 [<c05d0cff>] netlink_dump+0x4a/0x163
 [<c05d2812>] netlink_dump_start+0xf9/0x11c
 [<c05c5fa7>] rtnl_dump_ifinfo+0x0/0x69
 [<c05c5d59>] rtnetlink_rcv_msg+0xad/0x1ac
 [<c05c5fa7>] rtnl_dump_ifinfo+0x0/0x69
 [<c05c5cac>] rtnetlink_rcv_msg+0x0/0x1ac
 [<c05d1a0c>] netlink_rcv_skb+0x2d/0x71
 [<c05c5ca6>] rtnetlink_rcv+0x14/0x1a
 [<c05d1836>] netlink_unicast+0x1a2/0x205
 [<c05d1f0b>] netlink_sendmsg+0x24a/0x257
 [<c05b44c4>] sock_sendmsg+0xc7/0xe1
 [<c0434958>] autoremove_wake_function+0x0/0x2d
 [<c0450d0c>] sync_page+0x0/0x36
 [<c044f17d>] __delayacct_blkio_end+0x56/0x59
 [<c0629b6b>] io_schedule+0x65/0x81
 [<c0629c9d>] __wait_on_bit_lock+0x4b/0x52
 [<c0450ba2>] find_get_page+0x1d/0x7a
 [<c04ee9d9>] copy_from_user+0x23/0x4f
 [<c05b4e0a>] sys_sendto+0xfc/0x127
 [<c045c52d>] __do_fault+0x2fb/0x33d
 [<c05b5719>] sys_socketcall+0xfc/0x1a9
 [<c0403841>] sysenter_do_call+0x12/0x21
Code: ff 00 89 d8 e8 28 e6 05 00 31 c0 5b 5e c3 55 83 c9 ff 57 31 ff 56 31 f6 53 8b a8 6c 03 00 00 8d 58 58 eb 0c 89 e8 f7 d0 8b 04 88 <03> 78 04 03 30 89 c8 ba a0 9c 81 c0 e8 66 a1 f8 ff 83 f8 1f 89 
EIP: [<c055f2f5>] get_stats+0x1d/0x48 SS:ESP 0068:df0b0c88
---[ end trace 8be667e49b995a38 ]---
----------------------------------------

After doing "chkconfig microcode_ctl off" and reboot, I got below.

----------------------------------------
(... snipped ...)
INIT: Entering runlevel: 3

Entering non-interactive startup
Starting sysstat:  Calling the system activity data collector (sadc): BUG: unable to handle kernel NULL pointer dereference at 00000004
IP: [<c055f2f5>] get_stats+0x1d/0x48
Oops: 0000 [#1] SMP 
last sysfs file: /sys/block/hda/removable
Modules linked in: dm_mirror dm_region_hash dm_log dm_multipath dm_mod rfkill input_polldev sbs sbshc battery lp sg floppy ide_cd_mod cdrom serio_raw parport_pc parport rtc_cmos rtc_core rtc_lib ac pcnet32 button mii ata_piix libata i2c_piix4 pcspkr i2c_core mptspi mptscsih mptbase scsi_transport_spi sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd

Pid: 2417, comm: sadc Not tainted (2.6.28 #1) VMware Virtual Platform
EIP: 0060:[<c055f2f5>] EFLAGS: 00010297 CPU: 0
EIP is at get_stats+0x1d/0x48
EAX: 00000000 EBX: df94b858 ECX: 00000001 EDX: 00000001
ESI: 00000000 EDI: 00000000 EBP: 206a5abf ESP: df396f0c
 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process sadc (pid: 2417, ti=df396000 task=df87edb0 task.ti=df396000)
Stack:
 df94b800 df970f00 df94b800 000000c8 c05bcc0f c066ee4c df970f00 c04828b3
 00000400 b7f93000 dfb89380 df970f20 00000000 00000001 00000000 00000000
 00000000 df8e1340 c04826ec fffffffb dfb89380 c049f08d df396fa0 00000400
Call Trace:
 [<c05bcc0f>] dev_seq_show+0x1c/0x77
 [<c04828b3>] seq_read+0x1c7/0x2a0
 [<c04826ec>] seq_read+0x0/0x2a0
 [<c049f08d>] proc_reg_read+0x58/0x6b
 [<c049f035>] proc_reg_read+0x0/0x6b
 [<c0470444>] vfs_read+0x81/0xf4
 [<c0470720>] sys_read+0x3c/0x63
 [<c0403841>] sysenter_do_call+0x12/0x21
Code: ff 00 89 d8 e8 28 e6 05 00 31 c0 5b 5e c3 55 83 c9 ff 57 31 ff 56 31 f6 53 8b a8 6c 03 00 00 8d 58 58 eb 0c 89 e8 f7 d0 8b 04 88 <03> 78 04 03 30 89 c8 ba a0 9c 81 c0 e8 66 a1 f8 ff 83 f8 1f 89 
EIP: [<c055f2f5>] get_stats+0x1d/0x48 SS:ESP 0068:df396f0c
---[ end trace 51b8087926b0fb03 ]---
/etc/rc3.d/S03sysstat: line 34:  2417 Segmentation fault      /usr/lib/sa/sadc -F -L -

[FAILED]

Starting background readahead: [  OK  ]

Bringing up loopback interface:  BUG: unable to handle kernel NULL pointer dereference at 00000004
IP: [<c055f2f5>] get_stats+0x1d/0x48
*pde = 00000000 
Oops: 0000 [#2] SMP 
last sysfs file: /sys/block/hda/removable
Modules linked in: dm_mirror dm_region_hash dm_log dm_multipath dm_mod rfkill input_polldev sbs sbshc battery lp sg floppy ide_cd_mod cdrom serio_raw parport_pc parport rtc_cmos rtc_core rtc_lib ac pcnet32 button mii ata_piix libata i2c_piix4 pcspkr i2c_core mptspi mptscsih mptbase scsi_transport_spi sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd

Pid: 2492, comm: ip Tainted: G      D    (2.6.28 #1) VMware Virtual Platform
EIP: 0060:[<c055f2f5>] EFLAGS: 00010297 CPU: 0
EIP is at get_stats+0x1d/0x48
EAX: 00000000 EBX: df94b858 ECX: 00000001 EDX: 00000001
ESI: 00000000 EDI: 00000000 EBP: 206a5abf ESP: deea4c88
 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process ip (pid: 2492, ti=deea4000 task=df87edb0 task.ti=deea4000)
Stack:
 dee5908c df94b964 df1c36c0 df94b800 c05c571a dedc3040 dee59000 df93e916
 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00004034
 df94b800 df16b9c0 00000000 df1c36c0 c05c5fe7 000009bc 495a1819 00000000
Call Trace:
 [<c05c571a>] rtnl_fill_ifinfo+0x2c9/0x498
 [<c05c5fe7>] rtnl_dump_ifinfo+0x40/0x69
 [<c05d0cff>] netlink_dump+0x4a/0x163
 [<c05d2812>] netlink_dump_start+0xf9/0x11c
 [<c05c5fa7>] rtnl_dump_ifinfo+0x0/0x69
 [<c05c5d59>] rtnetlink_rcv_msg+0xad/0x1ac
 [<c05c5fa7>] rtnl_dump_ifinfo+0x0/0x69
 [<c04dfad4>] __generic_unplug_device+0x1a/0x1c
 [<c05c5cac>] rtnetlink_rcv_msg+0x0/0x1ac
 [<c05d1a0c>] netlink_rcv_skb+0x2d/0x71
 [<c05c5ca6>] rtnetlink_rcv+0x14/0x1a
 [<c05d1836>] netlink_unicast+0x1a2/0x205
 [<c05d1f0b>] netlink_sendmsg+0x24a/0x257
 [<c05b44c4>] sock_sendmsg+0xc7/0xe1
 [<c0434958>] autoremove_wake_function+0x0/0x2d
 [<c0450d0c>] sync_page+0x0/0x36
 [<c044f17d>] __delayacct_blkio_end+0x56/0x59
 [<c0629b6b>] io_schedule+0x65/0x81
 [<c0629c9d>] __wait_on_bit_lock+0x4b/0x52
 [<c0450ba2>] find_get_page+0x1d/0x7a
 [<c04ee9d9>] copy_from_user+0x23/0x4f
 [<c05b4e0a>] sys_sendto+0xfc/0x127
 [<c045c52d>] __do_fault+0x2fb/0x33d
 [<c05b5719>] sys_socketcall+0xfc/0x1a9
 [<c0403841>] sysenter_do_call+0x12/0x21
Code: ff 00 89 d8 e8 28 e6 05 00 31 c0 5b 5e c3 55 83 c9 ff 57 31 ff 56 31 f6 53 8b a8 6c 03 00 00 8d 58 58 eb 0c 89 e8 f7 d0 8b 04 88 <03> 78 04 03 30 89 c8 ba a0 9c 81 c0 e8 66 a1 f8 ff 83 f8 1f 89 
EIP: [<c055f2f5>] get_stats+0x1d/0x48 SS:ESP 0068:deea4c88
---[ end trace 51b8087926b0fb03 ]---
----------------------------------------

This bug resembles the one I reported at http://lkml.org/lkml/2008/11/28/99 .

Regards.
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