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In-Reply-To: <74b0dcc4-a061-715e-93c1-e010fbaa85fb@linaro.org>
From:   Anna Schumaker <schumaker.anna@gmail.com>
Date:   Tue, 27 Jun 2023 15:08:59 -0400
Message-ID: <CAFX2JfkZsL=Q7+33BzOKaicFDSw0+PMOV8PqAiC_VLZzjPpvLQ@mail.gmail.com>
Subject: Re: Regression: NULL pointer dereference after NFS_V4_2_READ_PLUS
 (commit 7fd461c47)
To:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc:     Trond Myklebust <trondmy@hammerspace.com>,
        Anna Schumaker <Anna.Schumaker@netapp.com>,
        linux-nfs <linux-nfs@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "regressions@lists.linux.dev" <regressions@lists.linux.dev>
Content-Type: multipart/mixed; boundary="0000000000000c16e605ff21343b"
Precedence: bulk

--0000000000000c16e605ff21343b
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

Hi Krzysztof,

On Mon, Jun 26, 2023 at 6:28=E2=80=AFAM Krzysztof Kozlowski
<krzysztof.kozlowski@linaro.org> wrote:
>
> On 23/06/2023 19:59, Anna Schumaker wrote:
> >>>>>>>
> >>>>>>> Can you swap out yesterday's patch with this patch? I've adjusted=
 what
> >>>>>>> gets printed out, and added printk()s to xdr_copy_to_scratch().  =
I'm
> >>>>>>> starting to think that the xdr scratch buffer is fine, and that i=
t's
> >>>>>>> the other pointer passed to memcpy() in that function that's the
> >>>>>>> problem, and the output from this patch will confirm for me.
> >>>>>>
> >>>>>> Oh, and can you add this one on top of the v2 patch as well?
> >>>>>
> >>>>> Sorry about the noise today. Can you use this patch instead of the =
two
> >>>>> I attached earlier? I cleaned up the output and cut down on extra
> >>>>> output..
> >>>>>
> >>>>
> >>>> Here you have - attached.
> >>>
> >>> This is good, thanks! I was finally able to figure out how to hit the
> >>> bug using a 32bit x86 VM, so hopefully the next thing you hear from m=
e
> >>> is a patch fixing the bug!
> >
> > I'm really hopeful that the attached patch finally fixes the issue.
> > Can you try it and let me know?
>
> Just test it yourself on 32-bit system... There is absolutely nothing
> special in the system I reproduced it on. Nothing.
>

I have an updated set of patches for you to try out, hopefully fixing
that last set of warnings from the other day. I gave them the same
amount of testing as my previous patch: connectathon tests, xfstests,
and my own read plus test using x86_64 and i686 VMs mounted with NFS
versions 3, 4.0, 4.1, and 4.2 and sec=3Dsys, sec=3Dkrb5, sec=3Dkrb5i, and
sec=3Dkrb5p. I have not hit any oopses, warnings, or newly-failing
tests.

I would appreciate it if you could try it out on your hardware and let
me know if there is still an issue since trying to compile an
exynos_defconfig for an i686 VM will result in a different set of
Kconfig options getting selected compared to what you have.
Additionally, your odroid-hc1 has a unique CPU setup containing both a
Cortex-A15 and Cortex-A7 which isn't possible to virtualize with
libvirt.

Thanks.
Anna
>
> IP-Config: eth0 hardware address 00:1e:06:30:bf:ac mtu 1500
> IP-Config: eth0 guessed broadcast address 192.168.1.255
> IP-Config: eth0 complete (from 192.168.1.10):
>  address: 192.168.1.12     broadcast: 192.168.1.255    netmask:
> 255.255.255.0
>  gateway: 192.168.1.1      dns0     : 0.0.0.0          dns1   : 0.0.0.0
>
>  rootserver: 192.168.1.10 rootpath:
>  filename  :
> NFS-Mount: 192.168.1.10:/srv/nfs/odroidhc1
> Waiting 10 seconds for device /dev/nfs ...
> ERROR: device '/dev/nfs' not found. Skipping fsck.
> Mount cmd:
> mount.nfs4 -o vers=3D4,nolock 192.168.1.10:/srv/nfs/odroidhc1 /new_root
> [   21.800626] ------------[ cut here ]------------
> [   21.803891] WARNING: CPU: 7 PID: 154 at mm/highmem.c:603
> xdr_stream_unmap_current_page+0x18/0x24
> [   21.812729] Modules linked in:
> [   21.815642] CPU: 7 PID: 154 Comm: mount.nfs4 Not tainted
> 6.4.0-00001-gfbb103bb8df0 #8
> [   21.823444] Hardware name: Samsung Exynos (Flattened Device Tree)
> [   21.829525]  unwind_backtrace from show_stack+0x10/0x14
> [   21.834698]  show_stack from dump_stack_lvl+0x58/0x70
> [   21.839730]  dump_stack_lvl from __warn+0x7c/0x1bc
> [   21.844491]  __warn from warn_slowpath_fmt+0xbc/0x1b8
> [   21.849518]  warn_slowpath_fmt from
> xdr_stream_unmap_current_page+0x18/0x24
> [   21.856437]  xdr_stream_unmap_current_page from call_decode+0x210/0x2c=
8
> [   21.863020]  call_decode from __rpc_execute+0xf8/0x764
> [   21.868134]  __rpc_execute from rpc_execute+0xc0/0x1d0
> [   21.873243]  rpc_execute from rpc_run_task+0x148/0x190
> [   21.878348]  rpc_run_task from rpc_create_xprt+0x1a4/0x284
> [   21.883805]  rpc_create_xprt from rpc_create+0xf8/0x254
> [   21.889004]  rpc_create from nfs_create_rpc_client+0x150/0x17c
> [   21.894812]  nfs_create_rpc_client from nfs4_alloc_client+0x360/0x374
> [   21.901226]  nfs4_alloc_client from nfs_get_client+0x16c/0x3e8
> [   21.907030]  nfs_get_client from nfs4_set_client+0xfc/0x1a4
> [   21.912574]  nfs4_set_client from nfs4_create_server+0x11c/0x2fc
> [   21.918554]  nfs4_create_server from nfs4_try_get_tree+0x10/0x50
> [   21.924534]  nfs4_try_get_tree from vfs_get_tree+0x24/0xe4
> [   21.929993]  vfs_get_tree from path_mount+0x3e8/0xb04
> [   21.935019]  path_mount from sys_mount+0x20c/0x254
> [   21.939784]  sys_mount from ret_fast_syscall+0x0/0x1c
> [   21.944809] Exception stack(0xf0cf9fa8 to 0xf0cf9ff0)
> [   21.949837] 9fa0:                   0047ebe0 00479c64 0047e960
> 0047e9b8 0047e9c8 00000000
> [   21.957986] 9fc0: 0047ebe0 00479c64 b6f058c8 00000015 00466c08
> 00000010 00479c64 00466bfc
> [   21.966139] 9fe0: 00479e70 befb69b0 0045a708 b6dca610
> [   21.971245] irq event stamp: 0
> [   21.974188] hardirqs last  enabled at (0): [<00000000>] 0x0
> [   21.979736] hardirqs last disabled at (0): [<c012357c>]
> copy_process+0x810/0x1ffc
> [   21.987227] softirqs last  enabled at (0): [<c012357c>]
> copy_process+0x810/0x1ffc
> [   21.994679] softirqs last disabled at (0): [<00000000>] 0x0
> [   22.000264] ---[ end trace 0000000000000000 ]---
> [   22.004781] BUG: sleeping function called from invalid context at
> net/sunrpc/sched.c:953
> [   22.012876] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid:
> 154, name: mount.nfs4
> [   22.020936] preempt_count: 1, expected: 0
> [   22.024881] RCU nest depth: 0, expected: 0
> [   22.028955] INFO: lockdep is turned off.
> [   22.032889] CPU: 7 PID: 154 Comm: mount.nfs4 Tainted: G        W
>     6.4.0-00001-gfbb103bb8df0 #8
> [   22.042131] Hardware name: Samsung Exynos (Flattened Device Tree)
> [   22.048196]  unwind_backtrace from show_stack+0x10/0x14
> [   22.053393]  show_stack from dump_stack_lvl+0x58/0x70
> [   22.058417]  dump_stack_lvl from __might_resched+0x194/0x260
> [   22.064054]  __might_resched from __rpc_execute+0x118/0x764
> [   22.069596]  __rpc_execute from rpc_execute+0xc0/0x1d0
> [   22.074708]  rpc_execute from rpc_run_task+0x148/0x190
> [   22.079821]  rpc_run_task from rpc_create_xprt+0x1a4/0x284
> [   22.085281]  rpc_create_xprt from rpc_create+0xf8/0x254
> [   22.090483]  rpc_create from nfs_create_rpc_client+0x150/0x17c
> [   22.096286]  nfs_create_rpc_client from nfs4_alloc_client+0x360/0x374
> [   22.102700]  nfs4_alloc_client from nfs_get_client+0x16c/0x3e8
> [   22.108504]  nfs_get_client from nfs4_set_client+0xfc/0x1a4
> [   22.114050]  nfs4_set_client from nfs4_create_server+0x11c/0x2fc
> [   22.120029]  nfs4_create_server from nfs4_try_get_tree+0x10/0x50
> [   22.126009]  nfs4_try_get_tree from vfs_get_tree+0x24/0xe4
> [   22.131467]  vfs_get_tree from path_mount+0x3e8/0xb04
> [   22.136493]  path_mount from sys_mount+0x20c/0x254
> [   22.141258]  sys_mount from ret_fast_syscall+0x0/0x1c
> [   22.146284] Exception stack(0xf0cf9fa8 to 0xf0cf9ff0)
> [   22.151322] 9fa0:                   0047ebe0 00479c64 0047e960
> 0047e9b8 0047e9c8 00000000
> [   22.159461] 9fc0: 0047ebe0 00479c64 b6f058c8 00000015 00466c08
> 00000010 00479c64 00466bfc
> [   22.167606] 9fe0: 00479e70 befb69b0 0045a708 b6dca610
> [   22.172820] BUG: scheduling while atomic: mount.nfs4/154/0x00000002
> [   22.178871] INFO: lockdep is turned off.
> [   22.182803] Modules linked in:
> [   22.185798] CPU: 7 PID: 154 Comm: mount.nfs4 Tainted: G        W
>     6.4.0-00001-gfbb103bb8df0 #8
> [   22.195076] Hardware name: Samsung Exynos (Flattened Device Tree)
> [   22.201139]  unwind_backtrace from show_stack+0x10/0x14
> [   22.206337]  show_stack from dump_stack_lvl+0x58/0x70
> [   22.211365]  dump_stack_lvl from __schedule_bug+0x70/0x84
> [   22.216736]  __schedule_bug from __schedule+0x9c0/0xc80
> [   22.221936]  __schedule from schedule+0x58/0xf8
> [   22.226439]  schedule from schedule_timeout+0x134/0x200
> [   22.231641]  schedule_timeout from __wait_for_common+0xac/0x1f8
> [   22.237533]  __wait_for_common from
> wait_for_completion_killable+0x18/0x24
> [   22.244379]  wait_for_completion_killable from
> __kthread_create_on_node+0xe0/0x168
> [   22.251923]  __kthread_create_on_node from
> kthread_create_on_node+0x30/0x60
> [   22.258851]  kthread_create_on_node from svc_set_num_threads+0x1c8/0x4=
20
> [   22.265525]  svc_set_num_threads from nfs_callback_up+0x150/0x3c0
> [   22.271597]  nfs_callback_up from nfs4_init_client+0x98/0x144
> [   22.277306]  nfs4_init_client from nfs4_set_client+0xfc/0x1a4
> [   22.283026]  nfs4_set_client from nfs4_create_server+0x11c/0x2fc
> [   22.289005]  nfs4_create_server from nfs4_try_get_tree+0x10/0x50
> [   22.294985]  nfs4_try_get_tree from vfs_get_tree+0x24/0xe4
> [   22.300444]  vfs_get_tree from path_mount+0x3e8/0xb04
> [   22.305468]  path_mount from sys_mount+0x20c/0x254
> [   22.310249]  sys_mount from ret_fast_syscall+0x0/0x1c
> [   22.315261] Exception stack(0xf0cf9fa8 to 0xf0cf9ff0)
> [   22.320300] 9fa0:                   0047ebe0 00479c64 0047e960
> 0047e9b8 0047e9c8 00000000
> [   22.328438] 9fc0: 0047ebe0 00479c64 b6f058c8 00000015 00466c08
> 00000010 00479c64 00466bfc
> [   22.336582] 9fe0: 00479e70 befb69b0 0045a708 b6dca610
> :: running cleanup hook [udev]
> [   26.235349] systemd[1]: System time before build time, advancing clock=
.
> [   26.435536] systemd[1]: systemd 253.4-1-arch running in system mode
> (+PAM +AUDIT -SELINUX -APPARMOR -IMA +SMACK +SECCOMP +GCRYPT +GNUTLS
> +OPENSSL +ACL +BLKID +CURL +ELFUTILS +FIDO2 +IDN2 -IDN +IPTC +KMOD
> +LIBCRYPTSETUP +LIBFDISK +PCRE2 -PWQUALITY +P11KIT -QRENCODE +TPM2
> +BZIP2 +LZ4 +XZ +ZLIB +ZSTD +BPF_FRAMEWORK +XKBCOMMON +UTMP -SYSVINIT
> default-hierarchy=3Dunified)
> [   26.466749] systemd[1]: Detected architecture arm.
>
>
>
> Best regards,
> Krzysztof
>

--0000000000000c16e605ff21343b
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