Message-ID: <CA+G9fYs-xM3WZOOBuYOw+XyBHuCCS0P06tJk+8JK6r_MBrmOjA@mail.gmail.com>
Date:   Thu, 9 Jun 2022 18:40:56 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
        shuah@...nel.org, patches@...nelci.org,
        lkft-triage@...ts.linaro.org, pavel@...x.de, jonathanh@...dia.com,
        f.fainelli@...il.com, sudipm.mukherjee@...il.com,
        slade@...dewatkins.com
Subject: Re: [PATCH 5.17 000/772] 5.17.14-rc1 review

Hi Guenter,

On Thu, 9 Jun 2022 at 05:24, Guenter Roeck <linux@...ck-us.net> wrote:
>
> On Tue, Jun 07, 2022 at 06:53:12PM +0200, Greg Kroah-Hartman wrote:
> > This is the start of the stable review cycle for the 5.17.14 release.
> > There are 772 patches in this series, all will be posted as a response
> > to this one.  If anyone has any issues with these being applied, please
> > let me know.
> >
> > Responses should be made by Thu, 09 Jun 2022 16:48:02 +0000.
> > Anything received after that time might be too late.
> >
>
> Build results:
>         total: 158 pass: 158 fail: 0
> Qemu test results:
>         total: 489 pass: 489 fail: 0
>
> Tested-by: Guenter Roeck <linux@...ck-us.net>
>
> I see a new boot warning in some arm qemu tests, but that is related
> to enabling CONFIG_KFENCE and not a new problem. v5.17.y and v5.18.y
> are affected.

In LKFT we have been noticing this warning on the mainline, Linux-next,
5.18 and 5.17 on qemu-arm, and on x15 devices intermittently.

> [    8.157727] ------------[ cut here ]------------
> [    8.157843] WARNING: CPU: 0 PID: 0 at kernel/smp.c:894 smp_call_function_many_cond+0x38c/0x3a4
> [    8.158289] Modules linked in:
> [    8.158489] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.17.14-rc1-00773-gd0f9b2818e1e #1
> [    8.158564] Hardware name: ARM-Versatile Express
> [    8.158730]  unwind_backtrace from show_stack+0x10/0x14
> [    8.158802]  show_stack from dump_stack_lvl+0x50/0x6c
> [    8.158835]  dump_stack_lvl from __warn+0xd0/0x19c
> [    8.158863]  __warn from warn_slowpath_fmt+0x5c/0xb4
> [    8.158890]  warn_slowpath_fmt from smp_call_function_many_cond+0x38c/0x3a4
> [    8.158919]  smp_call_function_many_cond from smp_call_function+0x3c/0x50
> [    8.158947]  smp_call_function from set_memory_valid+0x74/0x94
> [    8.158975]  set_memory_valid from kfence_guarded_free+0x280/0x4b4
> [    8.159005]  kfence_guarded_free from kmem_cache_free+0x2f4/0x394
> [    8.159032]  kmem_cache_free from rcu_core+0x358/0xc34
> [    8.159062]  rcu_core from __do_softirq+0xf0/0x41c
> [    8.159101]  __do_softirq from irq_exit+0xa4/0xd4
> [    8.159127]  irq_exit from __irq_svc+0x50/0x68
>
> Guenter

[    0.000000] Linux version 5.19.0-rc1 (tuxmake@...make)
(arm-linux-gnueabihf-gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld
(GNU Binutils for Debian) 2.35.2) #1 SMP @1654710061
[    0.000000] CPU: ARMv7 Processor [412fc0f2] revision 2 (ARMv7), cr=10c5387d
[    0.000000] CPU: div instructions available: patching division code
<trim>
[    0.000000] kfence: initialized - using 2097152 bytes for 255
objects at 0x(ptrval)-0x(ptrval)
[    0.000000] ------------[ cut here ]------------
[    0.000000] WARNING: CPU: 0 PID: 0 at lib/refcount.c:25 kobject_get+0x9c/0xa0
[    0.000000] refcount_t: addition on 0; use-after-free.
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc1 #1
[    0.000000] Hardware name: Generic DRA74X (Flattened Device Tree)
[    0.000000]  unwind_backtrace from show_stack+0x18/0x1c
[    0.000000]  show_stack from dump_stack_lvl+0x58/0x70
[    0.000000]  dump_stack_lvl from __warn+0xd4/0x14c
[    0.000000]  __warn from warn_slowpath_fmt+0x98/0xbc
[    0.000000]  warn_slowpath_fmt from kobject_get+0x9c/0xa0
[    0.000000]  kobject_get from of_node_get+0x1c/0x24
[    0.000000]  of_node_get from of_fwnode_get+0x3c/0x48
[    0.000000]  of_fwnode_get from fwnode_full_name_string+0x34/0xa0
[    0.000000]  fwnode_full_name_string from device_node_string+0x5fc/0x6c8
[    0.000000]  device_node_string from pointer+0x38c/0x5b0
[    0.000000]  pointer from vsnprintf+0x22c/0x3cc
[    0.000000]  vsnprintf from vprintk_store+0x114/0x43c
[    0.000000]  vprintk_store from vprintk_emit+0x78/0x2ac
[    0.000000]  vprintk_emit from vprintk_default+0x28/0x30
[    0.000000]  vprintk_default from _printk+0x30/0x54
[    0.000000]  _printk from of_node_release+0x124/0x12c
[    0.000000]  of_node_release from kobject_put+0xc4/0x294
[    0.000000]  kobject_put from ti_dt_clocks_register+0x284/0x32c
[    0.000000]  ti_dt_clocks_register from dra7xx_dt_clk_init+0x18/0x11c
[    0.000000]  dra7xx_dt_clk_init from omap5_realtime_timer_init+0x10/0x21c
[    0.000000]  omap5_realtime_timer_init from start_kernel+0x558/0x718
[    0.000000]  start_kernel from 0x0
[    0.000000] ---[ end trace 0000000000000000 ]---
[    0.000000] ------------[ cut here ]------------
[    0.000000] WARNING: CPU: 0 PID: 0 at lib/refcount.c:28
fwnode_full_name_string+0x8c/0xa0
[    0.000000] refcount_t: underflow; use-after-free.
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G        W
  5.19.0-rc1 #1
[    0.000000] Hardware name: Generic DRA74X (Flattened Device Tree)
<trim>
[    0.000000] OF: ERROR: Bad of_node_put() on
/ocp/interconnect@...00000/segment@...arget-module@...0/cm_core@...lock@.../clock@0
[    0.000000] ------------[ cut here ]------------
<trim>
[    7.246032] ------------[ cut here ]------------
[    7.246063] WARNING: CPU: 1 PID: 0 at kernel/smp.c:913
smp_call_function_many_cond+0x3a0/0x3b0
[    7.259399] Modules linked in:
[    7.262481] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G        W
  5.19.0-rc1 #1
[    7.270202] Hardware name: Generic DRA74X (Flattened Device Tree)
[    7.276336]  unwind_backtrace from show_stack+0x18/0x1c
[    7.281585]  show_stack from dump_stack_lvl+0x58/0x70
[    7.286682]  dump_stack_lvl from __warn+0xd4/0x14c
[    7.291503]  __warn from warn_slowpath_fmt+0x64/0xbc
[    7.296508]  warn_slowpath_fmt from smp_call_function_many_cond+0x3a0/0x3b0
[    7.303527]  smp_call_function_many_cond from smp_call_function+0x34/0x3c
[    7.310363]  smp_call_function from set_memory_valid+0x7c/0x9c
[    7.316223]  set_memory_valid from kfence_guarded_free+0x284/0x4b0
[    7.322448]  kfence_guarded_free from kmem_cache_free+0x3a0/0x484
[    7.328582]  kmem_cache_free from rcu_core+0x2c0/0x964
[    7.333770]  rcu_core from __do_softirq+0x168/0x400
[    7.338684]  __do_softirq from irq_exit+0xc0/0xf0
[    7.343414]  irq_exit from call_with_stack+0x18/0x20
[    7.348419]  call_with_stack from __irq_svc+0x9c/0xb8
[    7.353515] Exception stack(0xf0045f40 to 0xf0045f88)
[    7.358581] 5f40: 00001770 00000000 fe600000 00000000 c2165260
c29e1500 c1f09f50 c1f09fb0
[    7.366821] 5f60: c1e95b28 c2163ad4 00000000 00000000 00000000
f0045f90 c0335434 c030983c
[    7.375030] 5f80: 600e0013 ffffffff
[    7.378540]  __irq_svc from arch_cpu_idle+0x28/0x44
[    7.383453]  arch_cpu_idle from default_idle_call+0x50/0xd0
[    7.389068]  default_idle_call from do_idle+0x224/0x2cc
[    7.394348]  do_idle from cpu_startup_entry+0x20/0x24
[    7.399414]  cpu_startup_entry from secondary_start_kernel+0x13c/0x15c
[    7.405975]  secondary_start_kernel from 0x80302180
[    7.410919] ---[ end trace 0000000000000000 ]---


you may refer to this warning log on the mainline.

https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v5.19-rc1-23-g34f4335c16a5/testrun/10066624/suite/log-parser-boot/tests/


- Naresh

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