BUG in ext4_setattr

BUG in ext4_setattr

[Pranith Kumar]

Hi,

The following splat occurs in the latest rc5+ kernel. I am not sure
this is enough information. Please let me know what options to enable
to get more meaningful info.

Thanks!

[ 6382.247836] ------------[ cut here ]------------
[ 6382.248011] Kernel BUG at c00b1a70 [verbose debug info unavailable]
[ 6382.248209] Oops: Exception in kernel mode, sig: 5 [#1]
[ 6382.248370] PowerMac
[ 6382.248442] Modules linked in: uinput joydev hid_generic usbhid
radeon hid drm_kms_helper evdev ttm drm snd_powermac snd_pcm snd_timer
snd soundcore loop fuse autofs4 ext4 crc16 mbcache jbd2 ohci_pci
ehci_pci ohci_hcd ehci_hcd sg firewire_ohci sungem sungem_phy
firewire_core crc_itu_t sd_mod sr_mod crc_t10dif cdrom
crct10dif_generic crct10dif_common usbcore usb_common
[ 6382.249822] CPU: 0 PID: 1239 Comm: dpkg Not tainted 3.17.0-rc5+ #14
[ 6382.250013] task: ec78c000 ti: ec610000 task.ti: ec610000
[ 6382.250179] NIP: c00b1a70 LR: c00b1a60 CTR: c00b1a48
[ 6382.250331] REGS: ec611d70 TRAP: 0700   Not tainted  (3.17.0-rc5+)
[ 6382.250518] MSR: 00029032 <EE,ME,IR,DR,RI>  CR: 40022488  XER: 20000000
[ 6382.250799]
[ 6382.250799] GPR00: f307d88c ec611e20 ec78c000 c05966e0 ec611ea8
00000000 00000000 00000000
[ 6382.250799] GPR08: 00010000 00000001 00000000 ec611e60 c00b1a48
1005831c 00000000 10040000
[ 6382.250799] GPR16: 1002f3d0 100d0000 100309e0 10030a68 00000000
1026ad50 102698f0 1003094c
[ 6382.250799] GPR24: 10d8b1c0 ec611ee0 00001846 ef0edb88 ef11e088
00000000 c05966e0 ef11e088
[ 6382.252001] NIP [c00b1a70] clear_page_dirty_for_io+0x28/0x11c
[ 6382.252178] LR [c00b1a60] clear_page_dirty_for_io+0x18/0x11c
[ 6382.252349] Call Trace:
[ 6382.252436] [ec611e20] [ec611ee0] 0xec611ee0 (unreliable)
[ 6382.252667] [ec611e30] [f307d88c] ext4_setattr+0x2c/0x66c [ext4]
[ 6382.252863] [ec611e70] [c0100f14] notify_change+0x1b0/0x300
[ 6382.253046] [ec611ea0] [c00e7c60] chown_common.isra.10+0xe4/0x13c
[ 6382.253240] [ec611f10] [c00e8be0] SyS_fchownat+0x84/0xbc
[ 6382.253411] [ec611f40] [c0011fb8] ret_from_syscall+0x0/0x40
[ 6382.253591] --- interrupt: c01 at 0xff0006c
[ 6382.253591]     LR = 0x10003f3c
[ 6382.253810] Instruction dump:
[ 6382.253910] 7fc3f378 4bf66f84 9421fff0 7c0802a6 bfc10008 7c7f1b78
90010014 4800d32d
[ 6382.254215] 813f0000 7c7e1b78 552907fe 69290001 <0f090000> 2f830000
419e00cc 81230040
[ 6382.294471] ---[ end trace 5bfcfc2ec91b3062 ]---
[ 6382.294619]
[ 6549.036833] Unable to handle kernel paging request for data at
address 0x00000428
[ 6549.037094] Faulting instruction address: 0xc00b1a7c
[ 6549.037258] Oops: Kernel access of bad area, sig: 11 [#2]
[ 6549.037431] PowerMac
[ 6549.037510] Modules linked in: uinput joydev hid_generic usbhid
radeon hid drm_kms_helper evdev ttm drm snd_powermac snd_pcm snd_timer
snd soundcore loop fuse autofs4 ext4 crc16 mbcache jbd2 ohci_pci
ehci_pci ohci_hcd ehci_hcd sg firewire_ohci sungem sungem_phy
firewire_core crc_itu_t sd_mod sr_mod crc_t10dif cdrom
crct10dif_generic crct10dif_common usbcore usb_common
[ 6549.039149] CPU: 0 PID: 1261 Comm: vim Tainted: G      D
3.17.0-rc5+ #14
[ 6549.039377] task: ec762770 ti: ec77a000 task.ti: ec77a000
[ 6549.039548] NIP: c00b1a7c LR: c00b1a60 CTR: c00b1a48
[ 6549.039707] REGS: ec77bd70 TRAP: 0300   Tainted: G      D
(3.17.0-rc5+)
[ 6549.039933] MSR: 00009032 <EE,ME,IR,DR,RI>  CR: 28000824  XER: 00000000
[ 6549.040272] DAR: 00000428 DSISR: 40000000
[ 6549.040272] GPR00: f307d88c ec77be20 ec762770 000003e8 ec77bea8
00000001 35523e00 00000000
[ 6549.040272] GPR08: 00000000 00000000 000003e8 35523ec9 c00b1a48
1028b4a8 00000002 10280000
[ 6549.040272] GPR16: 102adba0 00000000 000001a4 00000000 10280000
10280000 10280000 10280000
[ 6549.040272] GPR24: 102af1e8 ec77bee0 00000041 ec5df6c0 ef15a2c8
000001a4 000003e8 ef15a2c8
[ 6549.041799] NIP [c00b1a7c] clear_page_dirty_for_io+0x34/0x11c
[ 6549.041982] LR [c00b1a60] clear_page_dirty_for_io+0x18/0x11c
[ 6549.042160] Call Trace:
[ 6549.042253] [ec77be20] [c00f4394] path_lookupat+0x60/0x6d8 (unreliable)
[ 6549.042540] [ec77be30] [f307d88c] ext4_setattr+0x2c/0x66c [ext4]
[ 6549.042748] [ec77be70] [c0100f14] notify_change+0x1b0/0x300
[ 6549.042943] [ec77bea0] [c00e78c4] chmod_common+0x74/0xd4
[ 6549.043126] [ec77bf10] [c00e8b18] SyS_fchmodat+0x48/0x78
[ 6549.043309] [ec77bf40] [c0011fb8] ret_from_syscall+0x0/0x40
[ 6549.043504] --- interrupt: c01 at 0xe847584
[ 6549.043504]     LR = 0x10149ea0
[ 6549.043730] Instruction dump:
[ 6549.043842] 7c0802a6 bfc10008 7c7f1b78 90010014 4800d32d 813f0000
7c7e1b78 552907fe
[ 6549.044203] 69290001 0f090000 2f830000 419e00cc <81230040> 81290010
712a0001 40a200bc
[ 6549.044573] ---[ end trace 5bfcfc2ec91b3063 ]---

-- 
Pranith

Re: BUG in ext4_setattr

[Theodore Ts'o]

On Thu, Sep 18, 2014 at 12:01:00PM -0400, Pranith Kumar wrote:
> 
> The following splat occurs in the latest rc5+ kernel. I am not sure
> this is enough information. Please let me know what options to enable
> to get more meaningful info.

This is a PowerMac, apparently.  I don't know why we can get symbol
information for at least part of the stack, but not for the fault
location.

Is this repeatable?  If so, the best way to go forward is a bisection
search.

							- Ted

Re: BUG in ext4_setattr

[Pranith Kumar]

On Thu, Sep 18, 2014 at 2:19 PM, Theodore Ts'o <tytso@mit.edu> wrote:
> On Thu, Sep 18, 2014 at 12:01:00PM -0400, Pranith Kumar wrote:
>>
>> The following splat occurs in the latest rc5+ kernel. I am not sure
>> this is enough information. Please let me know what options to enable
>> to get more meaningful info.
>
> This is a PowerMac, apparently.  I don't know why we can get symbol
> information for at least part of the stack, but not for the fault
> location.
>
> Is this repeatable?  If so, the best way to go forward is a bisection
> search.
>

I got this twice today, but sadly it is not repeating afterwards. I am
getting errors elsewhere though. So may be it is an issue with the
hardware.


-- 
Pranith