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Vasily Tarasov 701e054e0c [PATCH] mounstats NULL pointer dereference 
OpenVZ developers team has encountered the following problem in 2.6.19-rc6
kernel. After some seconds of running script

while [[ 1 ]]
do
	find  /proc -name mountstats | xargs cat
done

this Oops appears:

BUG: unable to handle kernel NULL pointer dereference at virtual address
00000010
 printing eip:
c01a6b70
*pde = 00000000
Oops: 0000 [#1]
SMP
Modules linked in: xt_length ipt_ttl xt_tcpmss ipt_TCPMSS iptable_mangle
iptable_filter xt_multiport xt_limit ipt_tos ipt_REJECT ip_tables x_tables
parport_pc lp parport sunrpc af_packet thermal processor fan button battery
asus_acpi ac ohci_hcd ehci_hcd usbcore i2c_nforce2 i2c_core tg3 floppy
pata_amd
ide_cd cdrom sata_nv libata
CPU:    1
EIP:    0060:[<c01a6b70>]    Not tainted VLI
EFLAGS: 00010246   (2.6.19-rc6 #2)
EIP is at mountstats_open+0x70/0xf0
eax: 00000000   ebx: e6247030   ecx: e62470f8   edx: 00000000
esi: 00000000   edi: c01a6b00   ebp: c33b83c0   esp: f4105eb4
ds: 007b   es: 007b   ss: 0068
Process cat (pid: 6044, ti=f4105000 task=f4104a70 task.ti=f4105000)
Stack: c33b83c0 c04ee940 f46a4a80 c33b83c0 e4df31b4 c01a6b00 f4105000 c0169231
       e4df31b4 c33b83c0 c33b83c0 f4105f20 00000003 f4105000 c0169445 f2503cf0
       f7f8c4c0 00008000 c33b83c0 00000000 00008000 c0169350 f4105f20 00008000
Call Trace:
 [<c01a6b00>] mountstats_open+0x0/0xf0
 [<c0169231>] __dentry_open+0x181/0x250
 [<c0169445>] nameidata_to_filp+0x35/0x50
 [<c0169350>] do_filp_open+0x50/0x60
 [<c01873d6>] seq_read+0xc6/0x300
 [<c0169511>] get_unused_fd+0x31/0xc0
 [<c01696d3>] do_sys_open+0x63/0x110
 [<c01697a7>] sys_open+0x27/0x30
 [<c01030bd>] sysenter_past_esp+0x56/0x79
 =======================
Code: 45 74 8b 54 24 20 89 44 24 08 8b 42 f0 31 d2 e8 47 cb f8 ff 85 c0 89 c3
74 51 8d 80 a0 04 00 00 e8 46 06 2c 00 8b 83 48 04 00 00 <8b> 78 10 85 ff 74
03
f0 ff 07 b0 01 86 83 a0 04 00 00 f0 ff 4b
EIP: [<c01a6b70>] mountstats_open+0x70/0xf0 SS:ESP 0068:f4105eb4

The problem is that task->nsproxy can be equal NULL for some time during
task exit. This patch fixes the BUG.

Signed-off-by: Vasily Tarasov <vtaras@openvz.org>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: "Serge E. Hallyn" <serue@us.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-11-25 13:28:33 -08:00
..
acpi ACPI: Processor native C-states using MWAIT 2006-10-14 00:35:39 -04:00
asm-alpha [PATCH] Consolidate check_signature 2006-10-11 11:14:23 -07:00
asm-arm [ARM] 3942/1: ARM: comment: consistent_sync should not be called directly 2006-11-22 22:45:57 +00:00
asm-arm26 fix file specification in comments 2006-10-03 23:01:26 +02:00
asm-avr32 AVR32: Wire up sys_epoll_pwait 2006-11-06 14:07:15 +01:00
asm-cris [PATCH] remove remaining errno and __KERNEL_SYSCALLS__ references 2006-10-02 07:57:23 -07:00
asm-frv [PATCH] FRV: Use the correct preemption primitives in kmap_atomic() and co 2006-10-16 08:32:29 -07:00
asm-generic Add "pure_initcall" for static variable initialization 2006-11-20 11:47:18 -08:00
asm-h8300 [PATCH] remove remaining errno and __KERNEL_SYSCALLS__ references 2006-10-02 07:57:23 -07:00
asm-i386 [PATCH] x86: Add acpi_user_timer_override option for Asus boards 2006-11-14 16:57:46 +01:00
asm-ia64 [PATCH] mspec driver build fix 2006-11-13 07:40:42 -08:00
asm-m32r [PATCH] Consolidate check_signature 2006-10-11 11:14:23 -07:00
asm-m68k [PATCH] sun3_ioremap() prototype 2006-10-15 11:00:58 -07:00
asm-m68knommu [PATCH] m68knommu: fix up for the irq_handler_t changes 2006-11-20 10:16:49 -08:00
asm-mips [PATCH] make au1xxx-ide compile again 2006-11-22 23:34:02 +00:00
asm-parisc [PARISC] pdc_init no longer exists 2006-10-07 05:22:30 -06:00
asm-powerpc [POWERPC] Revert "[POWERPC] Add powerpc get/set_rtc_time interface to new generic rtc class" 2006-11-22 12:13:36 +11:00
asm-ppc [PATCH] Consolidate check_signature 2006-10-11 11:14:23 -07:00
asm-s390 [S390] Fix pte type checking. 2006-10-18 18:30:51 +02:00
asm-sh sh: Fix IPR-IRQ's for IRQ-chip change breakage. 2006-10-31 12:53:28 +09:00
asm-sh64 [PATCH] Consolidate check_signature 2006-10-11 11:14:23 -07:00
asm-sparc [SPARC]: Fix robust futex syscalls and wire up migrate_pages. 2006-11-05 16:51:03 -08:00
asm-sparc64 [SPARC]: Fix robust futex syscalls and wire up migrate_pages. 2006-11-05 16:51:03 -08:00
asm-um [PATCH] uml: add INITCALLS 2006-10-31 08:07:00 -08:00
asm-v850 [PATCH] remove remaining errno and __KERNEL_SYSCALLS__ references 2006-10-02 07:57:23 -07:00
asm-x86_64 [PATCH] x86-64: Fix race in exit_idle 2006-11-14 16:57:46 +01:00
asm-xtensa fix file specification in comments 2006-10-03 23:01:26 +02:00
crypto
keys
linux [PATCH] mounstats NULL pointer dereference 2006-11-25 13:28:33 -08:00
math-emu
media V4L/DVB (4666): Ensure the WM8775 driver is loaded generically for any board. 2006-10-03 15:13:48 -03:00
mtd Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 2006-10-01 17:55:53 +01:00
net [IPVS]: Compile fix for annotations in userland. 2006-11-09 20:00:55 -08:00
pcmcia
rdma RDMA/addr: Use client registration to fix module unload race 2006-11-02 14:26:04 -08:00
rxrpc
scsi [SCSI] replace u8 and u32 with __u8 and __u32 in scsi.h for user space 2006-10-25 15:14:34 -07:00
sound [ALSA] version 1.0.13 2006-10-22 10:56:24 +02:00
video fix file specification in comments 2006-10-03 23:01:26 +02:00
Kbuild