> -----Message d'origine-----
> De : [email protected]
> [mailto:[email protected]] De la part de
> Fortier,Vincent [Montreal]
>
> > -----Message d'origine-----
> > De : Dhaval Giani [mailto:[email protected]]
> >
> > On Tue, Dec 11, 2007 at 10:06:53PM +0100, Ingo Molnar wrote:
> > >
> > > * Fortier,Vincent [Montreal] <[email protected]> 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:
Just to clarify... this is a non CFS kernel oops...
> [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.patc
> h). 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:
Again, just to clarify, I'm not even sure the backup worked at all using
a 2.6.22.13 CFS v24 since I already had a previous pending full backup
at 70% ... so it may simply had tried to finalize that one and crash
right at startup?
> [ 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
>
Regards,
- vin
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