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From:   Chuck Lever III <chuck.lever@oracle.com>
To:     Naresh Kamboju <naresh.kamboju@linaro.org>
CC:     Dan Carpenter <dan.carpenter@linaro.org>,
        Linux-Next Mailing List <linux-next@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        linux-mm <linux-mm@kvack.org>,
        "lkft-triage@lists.linaro.org" <lkft-triage@lists.linaro.org>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Christian Brauner <brauner@kernel.org>,
        "Paul E. McKenney" <paulmck@kernel.org>,
        "frederic@kernel.org" <frederic@kernel.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Anders Roxell <anders.roxell@linaro.org>,
        Jakub Kacinski <kuba@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Netdev <netdev@vger.kernel.org>
Subject: Re: next: qemu-arm64: kernel BUG at fs/inode.c:1763!
Thread-Topic: next: qemu-arm64: kernel BUG at fs/inode.c:1763!
Thread-Index: AQHZiMDxoePRYBOvEUaiPCVw5Sc2Hq9ekUsAgAKF1YCAAJbrAA==
Date:   Fri, 19 May 2023 14:40:05 +0000
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> On May 19, 2023, at 1:39 AM, Naresh Kamboju <naresh.kamboju@linaro.org> w=
rote:
>=20
> On Wed, 17 May 2023 at 20:38, Dan Carpenter <dan.carpenter@linaro.org> wr=
ote:
>>=20
>> The fs/inode.c:1763 bug is more stuff from net/handshake testing, so
>> lets add Chuck to the CC list.
>=20
> Anders bisected this problem and found the first bad commit,
>=20
> ---
> commit f921bd41001ccff2249f5f443f2917f7ef937daf
> Author: Chuck Lever <chuck.lever@oracle.com>
> Date:   Thu May 11 11:49:17 2023 -0400
>=20
>    net/handshake: Unpin sock->file if a handshake is cancelled
>=20
>    If user space never calls DONE, sock->file's reference count remains
>    elevated. Enable sock->file to be freed eventually in this case.
>=20
>    Reported-by: Jakub Kacinski <kuba@kernel.org>
>    Fixes: 3b3009ea8abb ("net/handshake: Create a NETLINK service for
> handling handshake requests")
>    Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
>    Signed-off-by: David S. Miller <davem@davemloft.net>
>=20
> net/handshake/handshake.h | 1 +
> net/handshake/request.c   | 4 ++++
> 2 files changed, 5 insertions(+)

I don't offhand see how test 9 might leave sock->file NULL.

I don't have access to aarch64 systems for a boot-time test,
and I'm not able to reproduce with kunit.py:

[cel@morisot morisot]$ cat .git/HEAD
ref: refs/heads/net-next
[cel@morisot morisot]$ tools/testing/kunit/kunit.py run --arch=3Darm64 --cr=
oss_compile=3Daarch64-linux-gnu- --kunitconfig ./net/handshake/.kunitconfig
[10:30:44] Configuring KUnit Kernel ...
[10:30:44] Building KUnit Kernel ...
Populating config with:
$ make ARCH=3Darm64 O=3D.kunit olddefconfig CROSS_COMPILE=3Daarch64-linux-g=
nu-
Building with:
$ make ARCH=3Darm64 O=3D.kunit --jobs=3D12 CROSS_COMPILE=3Daarch64-linux-gn=
u-
[10:30:49] Starting KUnit Kernel (1/1)...
[10:30:49] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Running tests with:
$ qemu-system-aarch64 -nodefaults -m 1024 -kernel .kunit/arch/arm64/boot/Im=
age.gz -append 'kunit.enable=3D1 console=3DttyAMA0 kunit_shutdown=3Dreboot'=
 -no-reboot -nographic -serial stdio -machine virt -cpu cortex-a57
[10:30:49] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Handshake API tests (11 sub=
tests) =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
[10:30:49] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D req_alloc=
 API fuzzing  =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
[10:30:49] [PASSED] handshake_req_alloc NULL proto
[10:30:49] [PASSED] handshake_req_alloc CLASS_NONE
[10:30:49] [PASSED] handshake_req_alloc CLASS_MAX
[10:30:49] [PASSED] handshake_req_alloc no callbacks
[10:30:49] [PASSED] handshake_req_alloc no done callback
[10:30:49] [PASSED] handshake_req_alloc excessive privsize
[10:30:49] [PASSED] handshake_req_alloc all good
[10:30:49] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D [PASSED] req_alloc AP=
I fuzzing =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
[10:30:49] [PASSED] req_submit NULL req arg
[10:30:49] [PASSED] req_submit NULL sock arg
[10:30:49] [PASSED] req_submit NULL sock->file
[10:30:49] [PASSED] req_lookup works
[10:30:49] [PASSED] req_submit max pending
[10:30:49] [PASSED] req_submit multiple
[10:30:49] [PASSED] req_cancel before accept
[10:30:49] [PASSED] req_cancel after accept
[10:30:49] [PASSED] req_cancel after done
[10:30:49] [PASSED] req_destroy works
[10:30:49] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D [PASSED] Handshake=
 API tests =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
[10:30:49] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
[10:30:49] Testing complete. Ran 17 tests: passed: 17
[10:30:49] Elapsed time: 4.956s total, 0.002s configuring, 4.439s building,=
 0.478s running

Any advice would be appreciated!


>> regards,
>> dan carpenter
>>=20
>> On Wed, May 17, 2023 at 06:39:57PM +0530, Naresh Kamboju wrote:
>>> Following kernel crash noticed while booting qemu-arm64 kunit builds on
>>> Linux next version 6.4.0-rc2-next-20230517.
>>>=20
>>> WARNING: CPU: 1 PID: 1436 at mm/page_alloc.c:4781 __alloc_pages
>>> kernel BUG at fs/inode.c:1763!
>>> WARNING: CPU: 0 PID: 0 at kernel/context_tracking.c:128
>>> ct_kernel_exit.constprop.0+0xe0/0xe8
>>>=20
>>> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
>>>=20
>>> Detailed Crash log:
>>> =3D=3D=3D=3D=3D=3D=3D=3D=3D
>>> <4>[  800.148388] ------------[ cut here ]------------
>>> <4>[  800.150072] WARNING: CPU: 1 PID: 1436 at mm/page_alloc.c:4781
>>> __alloc_pages+0x998/0x13e8
>>> <4>[  800.151978] Modules linked in:
>>> <4>[  800.153337] CPU: 1 PID: 1436 Comm: kunit_try_catch Tainted: G
>>> B            N 6.4.0-rc2-next-20230517 #1
>>> <4>[  800.154662] Hardware name: linux,dummy-virt (DT)
>>> <4>[  800.155921] pstate: 22400005 (nzCv daif +PAN -UAO +TCO -DIT
>>> -SSBS BTYPE=3D--)
>>> <4>[  800.157079] pc : __alloc_pages+0x998/0x13e8
>>> <4>[  800.158148] lr : __kmalloc_large_node+0xc0/0x1b8
>>> <4>[  800.159238] sp : ffff80000b5e7aa0
>>> <4>[  800.160154] x29: ffff80000b5e7aa0 x28: 0000000000000000 x27:
>>> 0000000000000000
>>> <4>[  800.161762] x26: ffff0000c4509f00 x25: ffff800008087a98 x24:
>>> ffffd0168ffa8460
>>> <4>[  800.163283] x23: 1ffff000016bcf74 x22: 0000000000040dc0 x21:
>>> 0000000000000000
>>> <4>[  800.164813] x20: 0000000000000015 x19: 0000000000000000 x18:
>>> 000000000000000b
>>> <4>[  800.166307] x17: 00000000bd2c963e x16: 00000000a2b18575 x15:
>>> 0000000033b8949b
>>> <4>[  800.167831] x14: 000000006d0ad0a4 x13: 00000000e32f85f5 x12:
>>> ffff7000016bcfa1
>>> <4>[  800.169363] x11: 1ffff000016bcfa0 x10: ffff7000016bcfa0 x9 :
>>> 000000000000f204
>>> <4>[  800.170928] x8 : 00000000f2000000 x7 : 00000000f2f2f2f2 x6 :
>>> 00000000f3f3f3f3
>>> <4>[  800.172467] x5 : 0000000000040dc0 x4 : ffff0000c614e900 x3 :
>>> 0000000000000000
>>> <4>[  800.173976] x2 : 0000000000000000 x1 : 0000000000000001 x0 :
>>> ffffd01696633000
>>> <4>[  800.175603] Call trace:
>>> <4>[  800.176314]  __alloc_pages+0x998/0x13e8
>>> <4>[  800.177355]  __kmalloc_large_node+0xc0/0x1b8
>>> <4>[  800.178401]  __kmalloc+0x158/0x1c0
>>> <4>[  800.179350]  handshake_req_alloc+0x70/0xb8
>>> <4>[  800.180510]  handshake_req_alloc_case+0xa4/0x188
>>> <4>[  800.181598]  kunit_try_run_case+0x88/0x120
>>> <4>[  800.182614]  kunit_generic_run_threadfn_adapter+0x38/0x60
>>> <4>[  800.183809]  kthread+0x194/0x1b0
>>> <4>[  800.184813]  ret_from_fork+0x10/0x20
>>> <4>[  800.185873] ---[ end trace 0000000000000000 ]---
>>> <6>[  800.202972]         ok 6 handshake_req_alloc excessive privsize
>>> <6>[  800.217425]         ok 7 handshake_req_alloc all good
>>> <6>[  800.219182]     # req_alloc API fuzzing: pass:7 fail:0 skip:0 tot=
al:7
>>> <6>[  800.222082]     ok 1 req_alloc API fuzzing
>>> <6>[  800.243148]     ok 2 req_submit NULL req arg
>>> <6>[  800.260195]     ok 3 req_submit NULL sock arg
>>> <6>[  800.274397]     ok 4 req_submit NULL sock->file
>>> <6>[  800.294631]     ok 5 req_lookup works
>>> <6>[  800.310289]     ok 6 req_submit max pending
>>> <6>[  800.326669]     ok 7 req_submit multiple
>>> <6>[  800.342645]     ok 8 req_cancel before accept
>>> <4>[  800.359161] ------------[ cut here ]------------
>>> <2>[  800.360659] kernel BUG at fs/inode.c:1763!
>>> <0>[  800.362464] Internal error: Oops - BUG: 00000000f2000800 [#1] PRE=
EMPT SMP
>>> <4>[  800.364079] Modules linked in:
>>> <4>[  800.364978] CPU: 0 PID: 9 Comm: kworker/0:1 Tainted: G    B   W
>>>      N 6.4.0-rc2-next-20230517 #1
>>> <4>[  800.366607] Hardware name: linux,dummy-virt (DT)
>>> <4>[  800.368282] Workqueue: events delayed_fput
>>> <4>[  800.369511] pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT
>>> -SSBS BTYPE=3D--)
>>> <4>[  800.370861] pc : iput+0x2c4/0x328
>>> <4>[  800.371839] lr : iput+0x3c/0x328
>>> <4>[  800.372882] sp : ffff800008107b50
>>> <6>[  800.375744]     ok 9 req_cancel after accept
>>> <4>[  800.376704] x29: ffff800008107b50 x28: ffffd016924f7400 x27:
>>> ffff0000c08d4da0
>>> <4>[  800.379288] x26: ffff0000c042f918 x25: ffff0000cc273918 x24:
>>> ffff0000cc273900
>>> <4>[  800.381160] x23: 0000000000000000 x22: ffff0000c042f9b8 x21:
>>> ffffd016924f7b40
>>> <4>[  800.383408] x20: ffff0000c042f880 x19: ffff0000c042f880 x18:
>>> 000000000000000b
>>> <4>[  800.385535] x17: ffffd0168fb6f094 x16: ffffd0168fb6ee10 x15:
>>> ffffd0168fb6ebd4
>>> <4>[  800.387985] x14: ffffd0168f7d5de8 x13: ffffd0168f617f98 x12:
>>> ffff700001020f53
>>> <4>[  800.389672] x11: 1ffff00001020f52 x10: ffff700001020f52 x9 :
>>> ffffd0168fb67384
>>> <4>[  800.392442] x8 : ffff800008107a98 x7 : 0000000000000000 x6 :
>>> 0000000000000008
>>> <4>[  800.395053] x5 : ffff800008107a58 x4 : 0000000000000001 x3 :
>>> dfff800000000000
>>> <4>[  800.397652] x2 : 0000000000000007 x1 : ffff0000c042f918 x0 :
>>> 0000000000000060
>>> <4>[  800.400110] Call trace:
>>> <4>[  800.401352]  iput+0x2c4/0x328
>>> <4>[  800.402741]  dentry_unlink_inode+0x12c/0x240
>>> <4>[  800.404519]  __dentry_kill+0x16c/0x2b0
>>> <4>[  800.406047]  dput+0x24c/0x438
>>> <4>[  800.407331]  __fput+0x140/0x3b0
>>> <4>[  800.409152]  delayed_fput+0x64/0x80
>>> <4>[  800.410708]  process_one_work+0x3cc/0x7d0
>>> <4>[  800.413032]  worker_thread+0xa4/0x6a0
>>> <4>[  800.415041]  kthread+0x194/0x1b0
>>> <6>[  800.416283]     ok 10 req_cancel after done
>>> <4>[  800.416205]  ret_from_fork+0x10/0x20
>>> <0>[  800.419090] Code: 17ffffc4 97fffb54 17ffffd4 d65f03c0 (d4210000)
>>> <4>[  800.421577] ---[ end trace 0000000000000000 ]---
>>> <6>[  800.424335] note: kworker/0:1[9] exited with irqs disabled
>>> <6>[  800.428252] note: kworker/0:1[9] exited with preempt_count 1
>>> <4>[  800.435635] ------------[ cut here ]------------
>>> <4>[  800.436529] WARNING: CPU: 0 PID: 0 at
>>> kernel/context_tracking.c:128 ct_kernel_exit.constprop.0+0xe0/0xe8
>>> <4>[  800.439070] Modules linked in:
>>> <4>[  800.440326] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G    B D W
>>>    N 6.4.0-rc2-next-20230517 #1
>>> <4>[  800.442196] Hardware name: linux,dummy-virt (DT)
>>> <4>[  800.443408] pstate: 224003c5 (nzCv DAIF +PAN -UAO +TCO -DIT
>>> -SSBS BTYPE=3D--)
>>> <4>[  800.445031] pc : ct_kernel_exit.constprop.0+0xe0/0xe8
>>> <4>[  800.446629] lr : ct_kernel_exit.constprop.0+0x20/0xe8
>>> <4>[  800.448263] sp : ffffd01694ed7cd0
>>> <4>[  800.449375] x29: ffffd01694ed7cd0 x28: 00000000437e90ac x27:
>>> 0000000000000000
>>> <4>[  800.451354] x26: ffffd01694ef1e40 x25: 0000000000000000 x24:
>>> 0000000000000000
>>> <4>[  800.453397] x23: ffffd01694ee2ba0 x22: 1ffffa02d29dafb4 x21:
>>> 0000000000000000
>>> <4>[  800.455573] x20: ffffd01692f29c20 x19: ffff0000da667c20 x18:
>>> 000000000000000b
>>> <4>[  800.457649] x17: 000000000055a8d0 x16: 000000006cbc159c x15:
>>> ffffd0168fb6865c
>>> <4>[  800.459662] x14: ffffd0168fb680ec x13: ffffd0168fb3b03c x12:
>>> ffff7a02d29daf81
>>> <4>[  800.461787] x11: 1ffffa02d29daf80 x10: ffff7a02d29daf80 x9 :
>>> dfff800000000000
>>> <4>[  800.463827] x8 : ffffd01694ed7c08 x7 : 0000000000000000 x6 :
>>> 0000000000000008
>>> <4>[  800.465864] x5 : ffffd01694ed7bc8 x4 : 0000000000000001 x3 :
>>> dfff800000000000
>>> <4>[  800.467860] x2 : 4000000000000002 x1 : 4000000000000000 x0 :
>>> ffff2fea4773e000
>>> <4>[  800.469981] Call trace:
>>> <4>[  800.470946]  ct_kernel_exit.constprop.0+0xe0/0xe8
>>> <4>[  800.472535]  ct_idle_enter+0x10/0x20
>>> <4>[  800.473923]  default_idle_call+0x58/0x90
>>> <4>[  800.475213]  do_idle+0x304/0x388
>>> <4>[  800.476492]  cpu_startup_entry+0x2c/0x40
>>> <4>[  800.477885]  rest_init+0x120/0x128
>>> <4>[  800.478830]  arch_call_rest_init+0x1c/0x28
>>> <4>[  800.479961]  start_kernel+0x2f8/0x3c0
>>> <4>[  800.482015]  __primary_switched+0xc0/0xd0
>>> <4>[  800.483086] ---[ end trace 0000000000000000 ]---
>>> <6>[  800.487780]     ok 11 req_destroy works
>>> <6>[  800.488283] # Handshake API tests: pass:11 fail:0 skip:0 total:11
>>> <6>[  800.491161] # Totals: pass:17 fail:0 skip:0 total:17
>>> <6>[  800.495059] ok 75 Handshake API tests
>>> <6>[  800.514129] uart-pl011 9000000.pl011: no DMA platform data
>>>=20
>>> links,
>>> - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230=
517/testrun/17029810/suite/boot/test/gcc-12-lkftconfig-kunit/log
>>> - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230=
517/testrun/17029810/suite/boot/test/gcc-12-lkftconfig-kunit/history/
>>> - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230=
517/testrun/17029810/suite/boot/tests/
>>>=20
>>> Steps to reproduce:
>>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>>> # To install tuxrun on your system globally:
>>> # sudo pip3 install -U tuxrun=3D=3D0.42.0
>>> #
>>> # See https://tuxrun.org/ for complete documentation.
>>>=20
>>> tuxrun   \
>>> --runtime podman   \
>>> --device qemu-arm64   \
>>> --kernel https://storage.tuxsuite.com/public/linaro/lkft/builds/2PtylM1=
zfMZo4vZUtwFtBJhJRvx/Image.gz
>>>  \
>>> --modules https://storage.tuxsuite.com/public/linaro/lkft/builds/2PtylM=
1zfMZo4vZUtwFtBJhJRvx/modules.tar.xz
>>>  \
>>> --rootfs https://storage.tuxsuite.com/public/linaro/lkft/oebuilds/2PeQh=
lPkvTmtoQVO1F0CQ7lAsm5/images/juno/lkft-tux-image-juno-20230511150149.rootf=
s.ext4.gz
>>>  \
>>> --parameters SKIPFILE=3Dskipfile-lkft.yaml   \
>>> --image docker.io/lavasoftware/lava-dispatcher:2023.01.0020.gc1598238f =
  \
>>> --tests kunit   \
>>> --timeouts boot=3D30
>>>=20
>>> --
>>> Linaro LKFT
>>> https://lkft.linaro.org
>=20
> - Naresh

--
Chuck Lever