Message-ID: <CAK7LNARnytQTW5vE+u+ez1pHuSVS34cQ0+xK+MLyfLp05GjoaA@mail.gmail.com>
Date: Tue, 6 Aug 2024 17:57:47 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: kernel test robot <oliver.sang@...el.com>
Cc: oe-lkp@...ts.linux.dev, lkp@...el.com, linux-kernel@...r.kernel.org, 
	linux-kbuild@...r.kernel.org
Subject: Re: [linus:master] [kconfig] f79dc03fe6: segfault_at_ip_sp_error

On Tue, Aug 6, 2024 at 5:21 PM kernel test robot <oliver.sang@...el.com> wrote:
>
>
> hi, Masahiro Yamada,
>
> the config for this test is a random config, by this commit, the config has
> below diff with parent:
>
> --- /pkg/linux/i386-randconfig-r032-20230623/gcc-12/ee29e6204c32dce013ac6d1078d98dce5607ce86/.config    2024-08-05 12:56:30.744686432 +0800
> +++ /pkg/linux/i386-randconfig-r032-20230623/gcc-12/f79dc03fe68c79d388908182e68d702f7f1786bc/.config    2024-08-05 12:56:37.620536644 +0800
> @@ -770,14 +770,14 @@ CONFIG_MODULE_UNLOAD=y
>  CONFIG_MODULE_SIG=y
>  # CONFIG_MODULE_SIG_FORCE is not set
>  CONFIG_MODULE_SIG_ALL=y
> -CONFIG_MODULE_SIG_SHA1=y
> +# CONFIG_MODULE_SIG_SHA1 is not set
>  # CONFIG_MODULE_SIG_SHA256 is not set
>  # CONFIG_MODULE_SIG_SHA384 is not set
>  # CONFIG_MODULE_SIG_SHA512 is not set
> -# CONFIG_MODULE_SIG_SHA3_256 is not set
> +CONFIG_MODULE_SIG_SHA3_256=y
>  # CONFIG_MODULE_SIG_SHA3_384 is not set
>  # CONFIG_MODULE_SIG_SHA3_512 is not set
> -CONFIG_MODULE_SIG_HASH="sha1"
> +CONFIG_MODULE_SIG_HASH="sha3-256"
>  CONFIG_MODULE_COMPRESS_NONE=y
>  # CONFIG_MODULE_COMPRESS_GZIP is not set
>  # CONFIG_MODULE_COMPRESS_XZ is not set
> @@ -6201,7 +6201,6 @@ CONFIG_FIPS_SIGNATURE_SELFTEST_ECDSA=y
>  #
>  CONFIG_MODULE_SIG_KEY="certs/signing_key.pem"
>  CONFIG_MODULE_SIG_KEY_TYPE_RSA=y
> -# CONFIG_MODULE_SIG_KEY_TYPE_ECDSA is not set
>  CONFIG_SYSTEM_TRUSTED_KEYRING=y
>  CONFIG_SYSTEM_TRUSTED_KEYS=""
>  CONFIG_SYSTEM_EXTRA_CERTIFICATE=y
>
>
> we are not sure if these are expected?


This is expected.

f79dc03fe68c79d388908182e68d702f7f1786bc changed the way how choice is
calculated.
So, the randconfig from the same seed can result in a different .config file.



> we are not sure either if the issue in below report is caused by this config
> diff. just report what we observed in our tests FYI.


I believe it is a different issue.

It is just a problem with the combination of depmod
and CONFIG_MODULE_SIG_SHA3_256=y, isn't it?


What is your depmod (kmod) version?

The crash of kmod<=28 with CONFIG_MODULE_SIG_SHA3_384=y is a known issue:

https://lore.kernel.org/linux-kbuild/E1rNVlL-000qDm-Pg@rmk-PC.armlinux.org.uk/



>
>
> Hello,
>
> kernel test robot noticed "segfault_at_ip_sp_error" on:
>
> commit: f79dc03fe68c79d388908182e68d702f7f1786bc ("kconfig: refactor choice value calculation")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
>
> [test failed on linus/master      de9c2c66ad8e787abec7c9d7eff4f8c3cdd28aed]
> [test failed on linux-next/master d6dbc9f56c3a70e915625b6f1887882c23dc5c91]
>
> in testcase: rcutorture
> version:
> with following parameters:
>
>         runtime: 300s
>         test: default
>         torture_type: srcud
>
>
>
> compiler: gcc-12
> test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G
>
> (please refer to attached dmesg/kmsg for entire log/backtrace)
>
>
> +-------------------------+------------+------------+
> |                         | ee29e6204c | f79dc03fe6 |
> +-------------------------+------------+------------+
> | segfault_at_ip_sp_error | 0          | 30         |
> +-------------------------+------------+------------+
>
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <oliver.sang@...el.com>
> | Closes: https://lore.kernel.org/oe-lkp/202408061634.fe6be94-oliver.sang@intel.com
>
>
> [  OK  ] Started OpenBSD Secure Shell server.
> LKP: ttyS0: 263: Kernel tests: Boot OK!
> LKP: ttyS0: 263: HOSTNAME vm-snb-i386, MAC 52:54:00:12:34:56, kernel 6.10.0-rc7-00022-gf79dc03fe68c 1
> [   12.271477][   T23] input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input3
> LKP: ttyS0: 263:  /lkp/lkp/src/bin/run-lkp /lkp/jobs/scheduled/vm-meta-59/rcutorture-300s-default-srcud-debian-11.1-i386-20220923.cgz-i386-randconfig-r032-20230623-f79dc03fe68c-20240805-47158-x4nrel-3.yaml
> [   15.209351][  T483] depmod[483]: segfault at 0 ip b7abe4f6 sp bfb00aa4 error 4 in libc-2.31.so[8c4f6,b7a4b000+155000] likely on CPU 0 (core 0, socket 0)
> [ 15.210249][ T483] Code: 5b 5e 29 f8 5f c3 66 90 66 90 66 90 66 90 66 90 66 90 66 90 56 57 8b 7c 24 0c 31 c0 89 f9 83 e1 3f 66 0f ef c0 83 f9 30 77 17 <f3> 0f 6f 0f 66 0f 74 c1 66 0f d7 d0 85 d2 75 73 89 f8 83 e0 f0 eb
> All code
> ========
>    0:   5b                      pop    %rbx
>    1:   5e                      pop    %rsi
>    2:   29 f8                   sub    %edi,%eax
>    4:   5f                      pop    %rdi
>    5:   c3                      retq
>    6:   66 90                   xchg   %ax,%ax
>    8:   66 90                   xchg   %ax,%ax
>    a:   66 90                   xchg   %ax,%ax
>    c:   66 90                   xchg   %ax,%ax
>    e:   66 90                   xchg   %ax,%ax
>   10:   66 90                   xchg   %ax,%ax
>   12:   66 90                   xchg   %ax,%ax
>   14:   56                      push   %rsi
>   15:   57                      push   %rdi
>   16:   8b 7c 24 0c             mov    0xc(%rsp),%edi
>   1a:   31 c0                   xor    %eax,%eax
>   1c:   89 f9                   mov    %edi,%ecx
>   1e:   83 e1 3f                and    $0x3f,%ecx
>   21:   66 0f ef c0             pxor   %xmm0,%xmm0
>   25:   83 f9 30                cmp    $0x30,%ecx
>   28:   77 17                   ja     0x41
>   2a:*  f3 0f 6f 0f             movdqu (%rdi),%xmm1             <-- trapping instruction
>   2e:   66 0f 74 c1             pcmpeqb %xmm1,%xmm0
>   32:   66 0f d7 d0             pmovmskb %xmm0,%edx
>   36:   85 d2                   test   %edx,%edx
>   38:   75 73                   jne    0xad
>   3a:   89 f8                   mov    %edi,%eax
>   3c:   83 e0 f0                and    $0xfffffff0,%eax
>   3f:   eb                      .byte 0xeb
>
> Code starting with the faulting instruction
> ===========================================
>    0:   f3 0f 6f 0f             movdqu (%rdi),%xmm1
>    4:   66 0f 74 c1             pcmpeqb %xmm1,%xmm0
>    8:   66 0f d7 d0             pmovmskb %xmm0,%edx
>    c:   85 d2                   test   %edx,%edx
>    e:   75 73                   jne    0x83
>   10:   89 f8                   mov    %edi,%eax
>   12:   83 e0 f0                and    $0xfffffff0,%eax
>   15:   eb                      .byte 0xeb
> [   15.251290][  T487] torture module --- srcud:  disable_onoff_at_boot=0 ftrace_dump_at_shutdown=0 verbose_sleep_frequency=0 verbose_sleep_duration=1 random_shuffle=0
> [   15.255881][  T487] srcud-torture:--- Start of test: nreaders=1 nfakewriters=4 stat_interval=60 verbose=1 test_no_idle_hz=1 shuffle_interval=3 stutter=5 irqreader=1 fqs_duration=0 fqs_holdoff=0 fqs_stutter=3 test_boost=1/0 test_boost_interval=7 test_boost_duration=4 shutdown_secs=0 stall_cpu=0 stall_cpu_holdoff=10 stall_cpu_irqsoff=0 stall_cpu_block=0 n_barrier_cbs=0 onoff_interval=0 onoff_holdoff=0 read_exit_delay=13 read_exit_burst=16 nocbs_nthreads=0 nocbs_toggle=1000 test_nmis=0
> [   15.258765][  T487] srcud:  Start-test grace-period state: g0 f0x0
> [   15.259257][  T487] rcu_torture_write_types: Testing expedited GPs.
> [   15.259713][  T487] rcu_torture_write_types: Testing asynchronous GPs.
>
>
> The kernel config and materials to reproduce are available at:
> https://download.01.org/0day-ci/archive/20240806/202408061634.fe6be94-oliver.sang@intel.com
>
>
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
>


-- 
Best Regards
Masahiro Yamada

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