Red Hat Bugzilla – Bug 199057
unable to handle kernel NULL pointer dereference
Last modified: 2008-01-19 23:37:08 EST
The following message appears when disabling selinux enforcement with
"setenforce 0", starting openvpnd from extras, which would otherwise fail as
there is no fitting selinux policy, subsequently calling "setenforce 1" and
This is not a major problem, but should probably be caught somewhere.
BUG: unable to handle kernel NULL pointer dereference at virtual address 0000000b
*pde = 04591067
*pte = 00000000
Oops: 0000 [#1]
last sysfs file: /class/net/lo/type
Modules linked in: diva2i4l(U) isdn divas divadidd tun ppp_synctty ppp_async
crc_ccitt ppp_generic slhc 3c509 ip_conntrack_netbios_ns ipt_MASQUERADE
iptable_nat ip_nat ipt_REJECT xt_state ip_conntrack nfnetlink xt_tcpudp
iptable_filter ip_tables x_tables dm_mirror dm_mod lp parport_pc parport floppy
8139cp 8139too mii raid1 ext3 jbd
EIP: 0060:[<c048ed3a>] Not tainted VLI
EFLAGS: 00010286 (2.6.17-1.2145_FC5 #1)
EIP is at sysfs_hash_and_remove+0x18/0x100
eax: fffffff3 ebx: c06c95e4 ecx: c0434902 edx: fffffff3
esi: fffffff3 edi: fffffff3 ebp: c06c93a0 esp: c37e9eec
ds: 007b es: 007b ss: 0068
Process openvpn (pid: 22678, threadinfo=c37e9000 task=c73aa550)
Stack: c0637499 fffffff3 c06c93a0 c06c95e4 fffffff3 fffffff3 c06c93a0 c0491021
c06c9478 c5f2f608 c049106f c5f2f600 00000004 c06c93a0 c05315d8 00000000
00000000 c5f2f590 c5f2f400 c131ae10 c7fc4744 c059fda5 c5f2f400 c059ee39
<c0491021> remove_files+0x15/0x1e <c049106f> sysfs_remove_group+0x45/0x5b
<c05315d8> class_device_del+0x105/0x149 <c059fda5> netdev_run_todo+0x114/0x277
<c059ee39> unregister_netdevice+0x1ec/0x212 <c0599ecf> skb_dequeue+0x39/0x3f
<ca972692> tun_chr_close+0xb1/0xb9 [tun] <c0456b29> __fput+0xb9/0x15f
<c0454438> filp_close+0x52/0x59 <c0402cd7> syscall_call+0x7/0xb
Code: 8b 40 20 8b 40 30 c3 8b 40 14 8b 00 c3 8b 40 14 8b 00 c3 55 57 56 53 83 ec
0c 85 c0 89 44 24 04 89 14 24 0f 84 e2 00 00 00 89 c2 <8b> 40 18 85 c0 0f 84 d5
00 00 00 8b 52 60 05 84 00 00 00 89 54
EIP: [<c048ed3a>] sysfs_hash_and_remove+0x18/0x100 SS:ESP 0068:c37e9eec
BUG: openvpn/22678, lock held at task exit time!
.. held by: openvpn:22678 [c73aa550, 116]
... acquired at: netdev_run_todo+0x1c/0x277
A new kernel update has been released (Version: 2.6.18-1.2200.fc5)
based upon a new upstream kernel release.
Please retest against this new kernel, as a large number of patches
go into each upstream release, possibly including changes that
may address this problem.
This bug has been placed in NEEDINFO state.
Due to the large volume of inactive bugs in bugzilla, if this bug is
still in this state in two weeks time, it will be closed.
Should this bug still be relevant after this period, the reporter
can reopen the bug at any time. Any other users on the Cc: list
of this bug can request that the bug be reopened by adding a
comment to the bug.
In the last few updates, some users upgrading from FC4->FC5
have reported that installing a kernel update has left their
systems unbootable. If you have been affected by this problem
please check you only have one version of device-mapper & lvm2
installed. See bug 207474 for further details.
If this bug is a problem preventing you from installing the
release this version is filed against, please see bug 169613.
If this bug has been fixed, but you are now experiencing a different
problem, please file a separate bug for the new problem.
(this is a mass-close to kernel bugs in NEEDINFO state)
As indicated previously there has been no update on the progress of this bug
therefore I am closing it as INSUFFICIENT_DATA. Please re-open if the issue
still occurs for you and I will try to assist in its resolution. Thank you for
taking the time to report the initial bug.
If you believe that this bug was closed in error, please feel free to reopen