Re: [linus:master] [kconfig] f79dc03fe6: segfault_at_ip_sp_error

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hi, Masahiro Yamada,

On Tue, Aug 06, 2024 at 05:57:47PM +0900, Masahiro Yamada wrote:
> On Tue, Aug 6, 2024 at 5:21 PM kernel test robot <oliver.sang@xxxxxxxxx> 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?

we are not sure. we just use randconfig to run rcutorture tests.

> 
> 
> What is your depmod (kmod) version?

our kmod version is 28

> 
> 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@xxxxxxxxxxxxxxxxxxxxxx/
> 
> 
> 
> >
> >
> > 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@xxxxxxxxx>
> > | Closes: https://lore.kernel.org/oe-lkp/202408061634.fe6be94-oliver.sang@xxxxxxxxx
> >
> >
> > [  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@xxxxxxxxx
> >
> >
> >
> > --
> > 0-DAY CI Kernel Test Service
> > https://github.com/intel/lkp-tests/wiki
> >
> 
> 
> -- 
> Best Regards
> Masahiro Yamada




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