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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