Re: [LTP] LTP: syscalls: regression on mainline - ioctl_loop01 mknod07 setns01

From: Yang Xu
Date: Fri Jun 05 2020 - 05:27:21 EST

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In reply to: Martijn Coenen: "Re: [LTP] LTP: syscalls: regression on mainline - ioctl_loop01 mknod07 setns01"
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Hi Martign

Also for your kernel commit,
lo->lo_flags |= prev_lo_flags & ~LOOP_SET_STATUS_SETTABLE_FLAGS;
lo->lo_flags |= prev_lo_flags & ~LOOP_SET_STATUS_CLEARABLE_FLAGS;

since ~LOOP_SET_STATUS_SETTABLE_FLAGS has been included in ~LOOP_SET_STATUS_CLEARABLE_FLAGS, do we still need the previous step?
What do you think about it?

Best Regards
Yang Xu

Hey Yang,

On Fri, Jun 5, 2020 at 10:59 AM Yang Xu <xuyang2018.jy@xxxxxxxxxxxxxx> wrote:

Hi Martijn

Sorry for noise. I see your patch in here[1] . I will modify
ioctl_loop01 to test that LO_FLAGS_PARTSCAN can not clear and
LO_FLAGS_AUTOCLEAR can be clear.

Thanks, that would indeed be useful.

ps: Giving the url of patch is better so that other people doesn't need
to investigate it again.
[1]https://patchwork.kernel.org/patch/11588321/

Ok, will do next time!

Best,
Martijn

Best Regards
Yang Xu

Hi Martijn

Hi Naresh,

I just sent a patch and cc'd you. I verified all the loop tests pass
again with that patch.

I think you want to say "without". I verified the ioctl_loop01 fails
with faf1d25440 ("loop: Clean up LOOP_SET_STATUS lo_flags handling").

This kernel commit breaks old behaviour(if old flag all 0, new flag is
always 0 regradless your flag setting).

I think we should modify code as below:
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 13518ba191f5..c6ba8cf486ce 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1364,11 +1364,9 @@ loop_set_status(struct loop_device *lo, const
struct loop_info64 *info)
if (err)
goto out_unfreeze;

- /* Mask out flags that can't be set using LOOP_SET_STATUS. */
- lo->lo_flags &= ~LOOP_SET_STATUS_SETTABLE_FLAGS;
- /* For those flags, use the previous values instead */
- lo->lo_flags |= prev_lo_flags & ~LOOP_SET_STATUS_SETTABLE_FLAGS;
- /* For flags that can't be cleared, use previous values too */
+ /* Mask out flags that can be set using LOOP_SET_STATUS. */
+ lo->lo_flags &= LOOP_SET_STATUS_SETTABLE_FLAGS;
+ /* For flags that can't be cleared, use previous values. */
lo->lo_flags |= prev_lo_flags &~LOOP_SET_STATUS_CLEARABLE_FLAGS;

Best Regards
Yang Xu

Thanks,
Martijn

On Thu, Jun 4, 2020 at 9:10 PM Martijn Coenen <maco@xxxxxxxxxxx> wrote:

Hi Naresh,

I suspect the loop failures are due to
faf1d25440d6ad06d509dada4b6fe62fea844370 ("loop: Clean up
LOOP_SET_STATUS lo_flags handling"), I will investigate and get back
to you.

Thanks,
Martijn

On Thu, Jun 4, 2020 at 7:19 PM Naresh Kamboju
<naresh.kamboju@xxxxxxxxxx> wrote:

+ linux-block@xxxxxxxxxxxxxxx

On Thu, 4 Jun 2020 at 22:47, Naresh Kamboju
<naresh.kamboju@xxxxxxxxxx> wrote:

Following three test cases reported as regression on Linux mainline
kernel
on x86_64, arm64, arm and i386

ltp-syscalls-tests:
* ioctl_loop01
* mknod07
* setns01

git repo:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git branch: master
GOOD:
git commit: b23c4771ff62de8ca9b5e4a2d64491b2fb6f8f69
git describe: v5.7-1230-gb23c4771ff62
BAD:
git commit: 1ee08de1e234d95b5b4f866878b72fceb5372904
git describe: v5.7-3523-g1ee08de1e234

kernel-config:
https://builds.tuxbuild.com/U3bU0dMA62OVHb4DvZIVuw/kernel.config

We are investigating these failures.

tst_test.c:906: CONF: btrfs driver not available
tst_test.c:1246: INFO: Timeout per run is 0h 15m 00s
tst_device.c:88: INFO: Found free device 1 '/dev/loop1'
ioctl_loop01.c:49: PASS: /sys/block/loop1/loop/partscan = 0
[ 1073.639677] loop_set_status: loop1 () has still dirty pages
(nrpages=1)
ioctl_loop01.c:50: PASS: /sys/block/loop1/loop/autoclear = 0
ioctl_loop01.c:51: PASS: /sys/block/loop1/loop/backing_file =
'/scratch/ltp-mnIdulzriQ/9cPtLQ/test.img'
ioctl_loop01.c:63: FAIL: expect 12 but got 17
ioctl_loop01.c:67: FAIL: /sys/block/loop1/loop/partscan != 1 got 0
ioctl_loop01.c:68: FAIL: /sys/block/loop1/loop/autoclear != 1 got 0
ioctl_loop01.c:79: FAIL: access /dev/loop1p1 fails
[ 1073.679678] loop_set_status: loop1 () has still dirty pages
(nrpages=1)
ioctl_loop01.c:85: FAIL: access /sys/block/loop1/loop1p1 fails

HINT: You _MAY_ be missing kernel fixes, see:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=10c70d95c0f2

mke2fs 1.43.8 (1-Jan-2018)
[ 1264.711379] EXT4-fs (loop0): mounting ext2 file system using the
ext4 subsystem
[ 1264.716642] EXT4-fs (loop0): mounted filesystem without journal.
Opts: (null)
mknod07 0 TINFO : Using test device LTP_DEV='/dev/loop0'
mknod07 0 TINFO : Formatting /dev/loop0 with ext2 opts=''
extra opts=''
mknod07 1 TPASS : mknod failed as expected:
TEST_ERRNO=EACCES(13): Permission denied
mknod07 2 TPASS : mknod failed as expected:
TEST_ERRNO=EACCES(13): Permission denied
mknod07 3 TFAIL : mknod07.c:155: mknod succeeded unexpectedly
mknod07 4 TPASS : mknod failed as expected:
TEST_ERRNO=EPERM(1): Operation not permitted
mknod07 5 TPASS : mknod failed as expected:
TEST_ERRNO=EROFS(30): Read-only file system
mknod07 6 TPASS : mknod failed as expected:
TEST_ERRNO=ELOOP(40): Too many levels of symbolic links

setns01 0 TINFO : ns_name=ipc, ns_fds[0]=6,
ns_types[0]=0x8000000
setns01 0 TINFO : ns_name=mnt, ns_fds[1]=7, ns_types[1]=0x20000
setns01 0 TINFO : ns_name=net, ns_fds[2]=8,
ns_types[2]=0x40000000
setns01 0 TINFO : ns_name=pid, ns_fds[3]=9,
ns_types[3]=0x20000000
setns01 0 TINFO : ns_name=uts, ns_fds[4]=10,
ns_types[4]=0x4000000
setns01 0 TINFO : setns(-1, 0x8000000)
setns01 1 TPASS : invalid fd exp_errno=9
setns01 0 TINFO : setns(-1, 0x20000)
setns01 2 TPASS : invalid fd exp_errno=9
setns01 0 TINFO : setns(-1, 0x40000000)
setns01 3 TPASS : invalid fd exp_errno=9
setns01 0 TINFO : setns(-1, 0x20000000)
setns01 4 TPASS : invalid fd exp_errno=9
setns01 0 TINFO : setns(-1, 0x4000000)
setns01 5 TPASS : invalid fd exp_errno=9
setns01 0 TINFO : setns(11, 0x8000000)
setns01 6 TFAIL : setns01.c:176: regular file fd exp_errno=22:
errno=EBADF(9): Bad file descriptor
setns01 0 TINFO : setns(11, 0x20000)
setns01 7 TFAIL : setns01.c:176: regular file fd exp_errno=22:
errno=EBADF(9): Bad file descriptor
setns01 0 TINFO : setns(11, 0x40000000)
setns01 8 TFAIL : setns01.c:176: regular file fd exp_errno=22:
errno=EBADF(9): Bad file descriptor
setns01 0 TINFO : setns(11, 0x20000000)
setns01 9 TFAIL : setns01.c:176: regular file fd exp_errno=22:
errno=EBADF(9): Bad file descriptor
setns01 0 TINFO : setns(11, 0x4000000)
setns01 10 TFAIL : setns01.c:176: regular file fd exp_errno=22:
errno=EBADF(9): Bad file descriptor

Full test log link,
https://lkft.validation.linaro.org/scheduler/job/1467931#L8047

test results comparison shows this test case started failing from
June-2-2020
https://qa-reports.linaro.org/lkft/linux-mainline-oe/build/v5.7-4092-g38696e33e2bd/testrun/2779586/suite/ltp-syscalls-tests/test/ioctl_loop01/history/

https://qa-reports.linaro.org/lkft/linux-mainline-oe/build/v5.7-4092-g38696e33e2bd/testrun/2779586/suite/ltp-syscalls-tests/test/setns01/history/

https://qa-reports.linaro.org/lkft/linux-mainline-oe/build/v5.7-4092-g38696e33e2bd/testrun/2779586/suite/ltp-syscalls-tests/test/mknod07/history/

--
Linaro LKFT
https://lkft.linaro.org

Next message: Russell King - ARM Linux admin: "Re: Security Random Number Generator support"
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In reply to: Martijn Coenen: "Re: [LTP] LTP: syscalls: regression on mainline - ioctl_loop01 mknod07 setns01"
Next in thread: Martijn Coenen: "Re: [LTP] LTP: syscalls: regression on mainline - ioctl_loop01 mknod07 setns01"
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