linux-kernel - Re: Upgraded from 3.4 to 3.5.1 kernel: machine does not boot

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Date:	Sun, 12 Aug 2012 08:10:34 -0500
From:	Eric Sandeen <sandeen@...deen.net>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
CC:	Jesper Juhl <jj@...osbits.net>, linux-kernel@...r.kernel.org,
	ap@...arrain.com, linux-ext4@...r.kernel.org
Subject: Re: Upgraded from 3.4 to 3.5.1 kernel: machine does not boot

On 8/10/12 11:14 PM, Justin Piszcz wrote:
> On Fri, Aug 10, 2012 at 7:07 PM, Justin Piszcz
>>
>> Hi,
>>
>> Found the root cause, the 3.5.1 kernel cannot mount my ext4 filesystem
>> (60TB).

You are a brave man running ext4 at 60T, but thank you for testing :)

Backing out 8aeb00ff85ad25453765dd339b408c0087db1527 from 3.5.1
(952fc18ef9ec707ebdc16c0786ec360295e5ff15 upstream) probably helps?

>From a quick look, I think that essentially has a :

for (i = 0; i < ngroups; i++) {

	for (j = 0; j < ngroups; j++) {

	}
}

type nested loop going on; for a filesystem this big it's going to take almost
literally forever, if I read it right.

-Eric

>> The 3.4 kernel works fine.
>>
>> This is proven by commenting out the filesystem in /etc/fstab with
>> 3.5.1, and all is OK.
>>
>> --
>>
>> Hi again,
>>
>> I tested with linux-3.6-rc1:
>>
>> The same problem, here is what I get from the strace:
>>
>> irectory)
>> 4434  readlink("/dev", 0x7fff3b05c670, 4096) = -1 EINVAL (Invalid argument)
>> 4434  readlink("/dev/sda1", 0x7fff3b05c670, 4096) = -1 EINVAL (Invalid
>> argument)
>> 4434  readlink("/r1", 0x7fff3b05c670, 4096) = -1 EINVAL (Invalid argument)
>> 4434  getuid()                          = 0
>> 4434  geteuid()                         = 0
>> 4434  getgid()                          = 0
>> 4434  getegid()                         = 0
>> 4434  prctl(PR_GET_DUMPABLE)            = 1
>> 4434  lstat("/etc/mtab", {st_mode=S_IFLNK|0777, st_size=12, ...}) = 0
>> 4434  getuid()                          = 0
>> 4434  geteuid()                         = 0
>> 4434  getgid()                          = 0
>> 4434  getegid()                         = 0
>> 4434  prctl(PR_GET_DUMPABLE)            = 1
>> 4434  stat("/run", {st_mode=S_IFDIR|0755, st_size=820, ...}) = 0
>> 4434  lstat("/run/mount/utab", {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
>> 4434  open("/run/mount/utab", O_RDWR|O_CREAT, 0644) = 3
>> 4434  close(3)                          = 0
>> 4434  mount("/dev/sda1", "/r1", "ext4", MS_MGC_VAL|MS_NOATIME, NULL
>>
>> --
>>
>> (w/ 3.6-rc1)
>>
>> [   89.868843] mount           R  running task        0  4434   4433
>> 0x00000009
>> [   89.868847]  ffff880c246b7b68 ffffffff816c9279 ffff880c246b7aa8
>> ffff880c246b7fd8
>> [   89.868851]  ffff880c246b7fd8 0000000000004000 ffff88062720cdb0
>> ffff880c246862d0
>> [   89.868855]  00000000000116c0 ffff880623a863c0 ffff880623a863c0
>> 00000000ffffffff
>> [   89.868855] Call Trace:
>> [   89.868858]  [<ffffffff816c9279>] ? __schedule+0x299/0x770
>> [   89.868860]  [<ffffffff816c9279>] ? __schedule+0x299/0x770
>> [   89.868864]  [<ffffffff8114a729>] ? ext4_get_group_desc+0x49/0xb0
>> [   89.868868]  [<ffffffff81161d41>] ? ext4_calculate_overhead+0x131/0x3e0
>> [   89.868871]  [<ffffffff81163a3b>] ? ext4_fill_super+0x1a4b/0x28d0
>> [   89.868875]  [<ffffffff810cc301>] ? mount_bdev+0x1a1/0x1e0
>> [   89.868877]  [<ffffffff81161ff0>] ? ext4_calculate_overhead+0x3e0/0x3e0
>> [   89.868880]  [<ffffffff8115dd00>] ? ext4_mount+0x10/0x20
>> [   89.868882]  [<ffffffff810cc55b>] ? mount_fs+0x1b/0xd0
>> [   89.868885]  [<ffffffff810e57af>] ? vfs_kern_mount+0x6f/0x110
>> [   89.868888]  [<ffffffff810e58cf>] ? do_kern_mount+0x4f/0x100
>> [   89.868890]  [<ffffffff810e6dae>] ? do_mount+0x2fe/0x8a0
>> [   89.868894]  [<ffffffff8109c0a3>] ? strndup_user+0x53/0x70
>> [   89.868896]  [<ffffffff810e73e0>] ? sys_mount+0x90/0xe0
>> [   89.868899]  [<ffffffff816cafa1>] ? tracesys+0xd4/0xd9
>>
>> Justin.
>>
>>
>>
> 
> CC: linux-ext4
> 
> Any ideas here (kernel 3.4 and below can mount 60TB ext4 no issues)
> but > 3.5.1 (did not try 3.5) cannot mount the filesystem.
> 
> Justin.
> 
> Justin.
> --
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