RE: 2.6.22.14 oops msg with commvault galaxy ?

From: Fortier,Vincent [Montreal]
Date: Wed Dec 12 2007 - 07:58:09 EST

> -----Message d'origine-----
> De : Dhaval Giani [mailto:dhaval@xxxxxxxxxxxxxxxxxx]
>
> On Tue, Dec 11, 2007 at 10:06:53PM +0100, Ingo Molnar wrote:
> >
> > * Fortier,Vincent [Montreal] <Vincent.Fortier1@xxxxxxxx> wrote:
> >
> > > > That has changed from /sys/kernel/uids/<uid>/cpu_share
> > >
> > > Here is my config.
> > >
> > > Maybie I should give it a shot without CFS at all and see what
> > > happends ?

It got triggerred also using a 2.6.22.14:
[57560.396000] BUG: unable to handle kernel paging request at virtual
address 80000000
[57560.396000] printing eip:
[57560.396000] c01d6c56
[57560.396000] *pdpt = 0000000008d02001
[57560.396000] *pde = 0000000000000000
[57560.396000] Oops: 0000 [#34]
[57560.396000] SMP
[57560.396000] last sysfs file: /devices/platform/floppy.0/uevent
[57560.396000] Modules linked in: xfs drbd cn nfs nfsd exportfs lockd
nfs_acl sunrpc ppdev parport_pc lp parport button ac battery ipv6 fuse
ide_cd ide_generic usbkbd usbmouse tsdev iTCO_wdt iTCO_vendor_support
psmouse e752x_edac edac_mc serio_raw evdev pcspkr sg floppy shpchp
pci_hotplug sr_mod cdrom ext3 jbd mbcache dm_mirror dm_snapshot dm_mod
generic piix ide_core tg3 ata_piix ehci_hcd uhci_hcd usbcore thermal
processor fan mptscsih mptbase megaraid_sas megaraid_mbox megaraid_mm
cciss aacraid
[57560.396000] CPU: 2
[57560.396000] EIP: 0060:[<c01d6c56>] Not tainted VLI
[57560.396000] EFLAGS: 00010297 (2.6.22.14-etch-686-envcan #1)
[57560.396000] EIP is at vsnprintf+0x2af/0x48c
[57560.396000] eax: 80000000 ebx: ffffffff ecx: 80000000 edx:
fffffffe
[57560.396000] esi: edf37017 edi: edf09eac ebp: ffffffff esp:
edf09e4c
[57560.396000] ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068
[57560.396000] Process clBackup (pid: 31421, ti=edf08000 task=f7d36530
task.ti=edf08000)
[57560.396000] Stack: c852b000 00001000 c0338c78 f895b56c c0233bf5
c852b000 120c8fe8 edf37017
[57560.396000] 00c3bd08 00000000 ffffffff ffffffff 00000000
c03354eb 00000003 00000017
[57560.396000] c0376dc0 c852b000 c01d6eb4 edf09eac edf09eac
c0233170 edf37017 c03354ea
[57560.396000] Call Trace:
[57560.396000] [<c0233bf5>] dev_uevent+0x189/0x1e0
[57560.396000] [<c01d6eb4>] sprintf+0x20/0x23
[57560.396000] [<c0233170>] show_uevent+0xad/0xd5
[57560.396000] [<c0154f48>] get_page_from_freelist+0x296/0x32d
[57560.396000] [<c012e6f0>] group_send_sig_info+0x12/0x56
[57560.396000] [<c0155031>] __alloc_pages+0x52/0x294
[57560.396000] [<c02330c3>] show_uevent+0x0/0xd5
[57560.396000] [<c0232c82>] dev_attr_show+0x15/0x18
[57560.396000] [<c01a6979>] sysfs_read_file+0x87/0xd8
[57560.396000] [<c0185f04>] sys_getxattr+0x46/0x4e
[57560.396000] [<c01a68f2>] sysfs_read_file+0x0/0xd8
[57560.396000] [<c016fe03>] vfs_read+0xa6/0x128
[57560.396000] [<c01701ff>] sys_read+0x41/0x67
[57560.396000] [<c0103d8a>] syscall_call+0x7/0xb
[57560.396000] =======================
[57560.396000] Code: 74 24 28 73 03 c6 06 20 4d 46 85 ed 7f f1 e9 b9 00
00 00 8b 0f b8 79 e0 32 c0 8b 54 24 2c 81 f9 ff 0f 00 00 0f 46 c8 89 c8
eb 06 <80> 38 00 74 07 40 4a 83 fa ff 75 f4 29 c8 f6 44 24 30 10 89 c3
[57560.396000] EIP: [<c01d6c56>] vsnprintf+0x2af/0x48c SS:ESP
0068:edf09e4c

> >
> > and also with CFS but without CONFIG_FAIR_GROUP_SCHED.
> >

Is it still required since it now does not seems to be CFS related?

>
> Hi Ingo,
>
> I am able to reproduce the oops here on my system with
> 2.6.22.14 + CFS backport. I am not able to reproduce it with
> 2.6.22.13 + CFS backport. I believe the CFS backport is just
> exposing the bug. Can't find an obvious culprit and am
> looking into this issue.
>
> Vincent, could you please confirm if you are able to
> reproduce this with
> 2.6.22.13 + CFS?

Using 2.6.13 + CFS v24 I was also able to reproduce the bug (I already
had one built in my depot without the
display_most-recently-opened_sysfs_file_name_when_oopsing.patch). So it
looks like it is at least related to >= 2.6.22.13 and probably not
directly CFS related. Note that to get a oops on a 2.6.13 it seems to
need a full backup since it usually works with incremental. The backup
does start properly then, in this case, at around 70% it oopsed. Using
2.6.22.14 it seems to oops right at startup. Here is the 2.6.22.13 CFS
v24 oops:

[ 170.152908] SGI XFS Quota Management subsystem
[ 170.168443] Filesystem "drbd0": Disabling barriers, not supported by
the underlying device
[ 170.174964] XFS mounting filesystem drbd0
[ 170.232455] Ending clean XFS mount for filesystem: drbd0
[ 170.318614] Filesystem "drbd1": Disabling barriers, not supported by
the underlying device
[ 170.327708] XFS mounting filesystem drbd1
[ 170.380481] Ending clean XFS mount for filesystem: drbd1
[ 947.493764] BUG: unable to handle kernel NULL pointer dereference at
virtual address 000000c8
[ 947.493797] printing eip:
[ 947.493810] c01a922c
[ 947.493823] *pdpt = 000000002a97a001
[ 947.493837] *pde = 0000000000000000
[ 947.493852] Oops: 0000 [#1]
[ 947.493865] SMP
[ 947.493881] Modules linked in: xfs drbd cn nfs nfsd exportfs lockd
nfs_acl sunrpc ppdev parport_pc lp parport button ac battery ipv6 fuse
ide_cd ide_generic usbkbd usbmouse tsdev iTCO_wdt iTCO_vendor_support sg
e752x_edac psmouse edac_mc pcspkr evdev shpchp pci_hotplug serio_raw
sr_mod floppy cdrom ext3 jbd mbcache dm_mirror dm_snapshot dm_mod
generic piix ide_core ehci_hcd uhci_hcd ata_piix usbcore tg3 thermal
processor fan mptscsih mptbase megaraid_sas megaraid_mbox megaraid_mm
cciss aacraid
[ 947.494099] CPU: 0
[ 947.494100] EIP: 0060:[<c01a922c>] Not tainted VLI
[ 947.494102] EFLAGS: 00010202 (2.6.22.13-cfs-etch-686-envcan #1)
[ 947.494148] EIP is at sysfs_open_file+0x78/0x1e4
[ 947.494163] eax: 00000000 ebx: dff18440 ecx: 0000000d edx:
000000c8
[ 947.494181] esi: f7fc118c edi: eb385f30 ebp: c01a91b4 esp:
eb385edc
[ 947.494199] ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068
[ 947.494217] Process clBackup (pid: 5273, ti=eb384000 task=f6558000
task.ti=eb384000)
[ 947.494235] Stack: ec339cc0 eafae158 f7fc1148 ec339cc0 eafae158
eb385f30 c01a91b4 c01704ac
[ 947.494278] dfaa8080 eafad220 ec339cc0 00008000 eb385f30
00000010 c01705dd ec339cc0
[ 947.494321] 00000000 00000000 c017061e 00000000 eb385f30
eafad220 dfaa8080 f711dd00
[ 947.494364] Call Trace:
[ 947.494389] [<c01a91b4>] sysfs_open_file+0x0/0x1e4
[ 947.494407] [<c01704ac>] __dentry_open+0xc1/0x178
[ 947.494429] [<c01705dd>] nameidata_to_filp+0x24/0x33
[ 947.494450] [<c017061e>] do_filp_open+0x32/0x39
[ 947.494475] [<c017038b>] get_unused_fd+0x4a/0xaa
[ 947.494496] [<c0170667>] do_sys_open+0x42/0xc3
[ 947.494518] [<c0170721>] sys_open+0x1c/0x1e
[ 947.494537] [<c0103d8a>] syscall_call+0x7/0xb
[ 947.494561] =======================
[ 947.494577] Code: 14 24 83 7c 24 08 00 8b 42 0c 8b 40 54 8b 70 14 0f
84 70 01 00 00 85 f6 0f 84 68 01 00 00 8b 56 04 85 d2 74 19 64 a1 08 50
3d c0 <83> 3a 02 0f 84 42 01 00 00 c1 e0 05 ff 84 10 20 01 00 00 8b 54
[ 947.494743] EIP: [<c01a922c>] sysfs_open_file+0x78/0x1e4 SS:ESP
0068:eb385edc

- vin
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