linux-ext4 - Re: regression in 6.1.yy branch: LTP test preadv03 fails

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Date: Thu, 7 Dec 2023 11:50:52 +0100
From: Yann Sionneau <ysionneau@...rayinc.com>
To: Greg KH <gregkh@...uxfoundation.org>
Cc: Theodore Ts'o <tytso@....edu>, Andreas Dilger
 <adilger.kernel@...ger.ca>, linux-ext4@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: regression in 6.1.yy branch: LTP test preadv03 fails

On 12/7/23 11:13, Greg KH wrote:

> On Thu, Dec 07, 2023 at 11:05:15AM +0100, Yann Sionneau wrote:
>> Hello,
>>
>> I noticed yesterday that LTP test preadv03 now fails since 6.1.64 (it also
>> fails on 6.1.65).
>>
>> 6.6.4, 6.6.3, 6.5.0 and 6.2.0 seem to be unaffected.
>>
>> I tested this on x86_64 and kvx arch (the latter is not upstream).
>>
>> I can see some ext4 related commits on 6.1.64 and 6.1.65 changes, maybe it's
>> related, therefore I add ext4 mailing list as CC.
>>
>> I didn't run git bisect on this so far because I noticed building an x86_64
>> ubuntu kernel on my laptop was taking ages. Maybe someone is more used to
>> dealing with this and can bisect this way faster than me.
> Should be fixed in the latest 6.1.y-rc release, right?  If not, please
> let me know.

Thanks for the quick reply, indeed it seems way better on 6.1.66-rc2.

I tested on kvx arch, all preadv* LTP tests are passing:

```

# ./preadv03
tst_device.c:88: TINFO: Found free device 0 '/dev/loop0'
[  346.920257] loop0: detected capacity change from 0 to 524288
[  346.970126] /dev/zero: Can't open blockdev
tst_supported_fs_types.c:89: TINFO: Kernel supports ext2
tst_supported_fs_types.c:51: TINFO: mkfs.ext2 does exist
[  346.993817] /dev/zero: Can't open blockdev
tst_supported_fs_types.c:89: TINFO: Kernel supports ext3
tst_supported_fs_types.c:51: TINFO: mkfs.ext3 does exist
[  347.021140] /dev/zero: Can't open blockdev
tst_supported_fs_types.c:89: TINFO: Kernel supports ext4
tst_supported_fs_types.c:51: TINFO: mkfs.ext4 does exist
tst_supported_fs_types.c:89: TINFO: Kernel supports vfat
tst_supported_fs_types.c:47: TINFO: mkfs.vfat does not exist
tst_supported_fs_types.c:156: TINFO: Skipping tmpfs as requested by the test
tst_test.c:1500: TINFO: Testing on ext2
tst_test.c:996: TINFO: Formatting /dev/loop0 with ext2 opts='' extra opts=''
mke2fs 1.46.2 (28-Feb-2021)
[  347.283637] blk_print_req_error: 96 callbacks suppressed
[  347.283662] operation not supported error, dev loop0, sector 524160 
op 0x9:(WRITE_ZEROES) flags 0x800
0800 phys_seg 0 prio class 2
[  347.301367] operation not supported error, dev loop0, sector 522 op 
0x9:(WRITE_ZEROES) flags 0x800080
0 phys_seg 0 prio class 2
[  347.313610] operation not supported error, dev loop0, sector 16906 op 
0x9:(WRITE_ZEROES) flags 0x8000
800 phys_seg 0 prio class 2
[  347.325948] operation not supported error, dev loop0, sector 32774 op 
0x9:(WRITE_ZEROES) flags 0x8000
800 phys_seg 0 prio class 2
[  347.338311] operation not supported error, dev loop0, sector 49674 op 
0x9:(WRITE_ZEROES) flags 0x8000
800 phys_seg 0 prio class 2
[  347.350667] operation not supported error, dev loop0, sector 65542 op 
0x9:(WRITE_ZEROES) flags 0x8000
800 phys_seg 0 prio class 2
[  347.363027] operation not supported error, dev loop0, sector 82442 op 
0x9:(WRITE_ZEROES) flags 0x8000
800 phys_seg 0 prio class 2
[  347.375367] operation not supported error, dev loop0, sector 98310 op 
0x9:(WRITE_ZEROES) flags 0x8000
800 phys_seg 0 prio class 2
[  347.387733] operation not supported error, dev loop0, sector 115210 
op 0x9:(WRITE_ZEROES) flags 0x800
0800 phys_seg 0 prio class 2
[  347.400156] operation not supported error, dev loop0, sector 131078 
op 0x9:(WRITE_ZEROES) flags 0x800
0800 phys_seg 0 prio class 2
[  347.445283] EXT4-fs (loop0): mounting ext2 file system using the ext4 
subsystem
[  347.453761] EXT4-fs (loop0): mounted filesystem without journal. 
Quota mode: disabled.
[  347.461716] ext2 filesystem being mounted at /tmp/preB0llUr/mntpoint 
supports timestamps until 2038 (
0x7fffffff)
tst_test.c:1431: TINFO: Timeout per run is 0h 05m 00s
[  347.475662] EXT4-fs (loop0): unmounting filesystem.
preadv03.c:102: TINFO: Using block size 512
preadv03.c:87: TPASS: preadv(O_DIRECT) read 512 bytes successfully with 
content 'a' expectedly
preadv03.c:87: TPASS: preadv(O_DIRECT) read 512 bytes successfully with 
content 'a' expectedly
preadv03.c:87: TPASS: preadv(O_DIRECT) read 512 bytes successfully with 
content 'b' expectedly
tst_test.c:1500: TINFO: Testing on ext3
tst_test.c:996: TINFO: Formatting /dev/loop0 with ext3 opts='' extra opts=''
mke2fs 1.46.2 (28-Feb-2021)
[  347.780931] EXT4-fs (loop0): mounting ext3 file system using the ext4 
subsystem
[  347.791652] EXT4-fs (loop0): mounted filesystem with ordered data 
mode. Quota mode: disabled.
[  347.800197] ext3 filesystem being mounted at /tmp/preB0llUr/mntpoint 
supports timestamps until 2038 (
0x7fffffff)
tst_test.c:1431: TINFO: Timeout per run is 0h 05m 00s
[  347.814544] EXT4-fs (loop0): unmounting filesystem.
preadv03.c:102: TINFO: Using block size 512
preadv03.c:87: TPASS: preadv(O_DIRECT) read 512 bytes successfully with 
content 'a' expectedly
preadv03.c:87: TPASS: preadv(O_DIRECT) read 512 bytes successfully with 
content 'a' expectedly
preadv03.c:87: TPASS: preadv(O_DIRECT) read 512 bytes successfully with 
content 'b' expectedly
tst_test.c:1500: TINFO: Testing on ext4
tst_test.c:996: TINFO: Formatting /dev/loop0 with ext4 opts='' extra opts=''
mke2fs 1.46.2 (28-Feb-2021)
[  347.888885] EXT4-fs (loop0): mounted filesystem with ordered data 
mode. Quota mode: disabled.
[  347.897455] ext4 filesystem being mounted at /tmp/preB0llUr/mntpoint 
supports timestamps until 2038 (
0x7fffffff)
tst_test.c:1431: TINFO: Timeout per run is 0h 05m 00s
[  347.911462] EXT4-fs (loop0): unmounting filesystem.
preadv03.c:102: TINFO: Using block size 512
preadv03.c:87: TPASS: preadv(O_DIRECT) read 512 bytes successfully with 
content 'a' expectedly
preadv03.c:87: TPASS: preadv(O_DIRECT) read 512 bytes successfully with 
content 'a' expectedly
preadv03.c:87: TPASS: preadv(O_DIRECT) read 512 bytes successfully with 
content 'b' expectedly

Summary:
passed   9
failed   0
broken   0
skipped  0
warnings 0

```

The errors during mkfs are weird but maybe it's an issue in kvx port... 
at least the test is passing now.

Thanks!

-- 

Yann