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Subject: Re: LTP: syscalls: regression on mainline - ioctl_loop01 mknod07
 setns01
To:     Martijn Coenen <maco@android.com>,
        Naresh Kamboju <naresh.kamboju@linaro.org>
CC:     LTP List <ltp@lists.linux.it>,
        open list <linux-kernel@vger.kernel.org>,
        linux-block <linux-block@vger.kernel.org>,
        chrubis <chrubis@suse.cz>, Arnd Bergmann <arnd@arndb.de>,
        Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
        Jan Stancek <jstancek@redhat.com>,
        Xiao Yang <yangx.jy@cn.fujitsu.com>,
        Richard Palethorpe <rpalethorpe@suse.com>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        <lkft-triage@lists.linaro.org>
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 <CA+G9fYuUvjDeLXVm2ax_5UF=OJeH7fog0U7GG2vEUXg-HXWRqg@mail.gmail.com>
 <CAB0TPYGo5ePYrah3Wgv_M1fx91+niRe12YaBBXGfs5b87Fjtrg@mail.gmail.com>
 <CAB0TPYEx4Z8do3qL1KVpnGGnorTLGqKtrwi1uQgxQ6Xw3JqiYw@mail.gmail.com>
From:   Yang Xu <xuyang2018.jy@cn.fujitsu.com>
Message-ID: <ca8a4087-8c8b-6105-3f2c-1e2deee5f987@cn.fujitsu.com>
Date:   Fri, 5 Jun 2020 16:21:32 +0800
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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@android.com> 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@linaro.org> wrote:
>>>
>>> + linux-block@vger.kernel.org
>>>
>>> On Thu, 4 Jun 2020 at 22:47, Naresh Kamboju <naresh.kamboju@linaro.org> 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
> 
>