[Bug libc/26862] New: FAIL: misc/tst-sysvshm-linux on armv7hl (Fedora Rawhide/34).

[Bug libc/26862] New: FAIL: misc/tst-sysvshm-linux on armv7hl (Fedora Rawhide/34).

[carlos at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26862

            Bug ID: 26862
           Summary: FAIL: misc/tst-sysvshm-linux on armv7hl (Fedora
                    Rawhide/34).
           Product: glibc
           Version: 2.33
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: carlos at redhat dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

See also: https://sourceware.org/bugzilla/show_bug.cgi?id=26736 (x32 failure)

In a recent Fedora Rawhide (f34) sync I saw the following failure for armv7hl:

=====FAIL: misc/tst-sysvshm-linux.out=====
../sysdeps/unix/sysv/linux/tst-sysvshm-linux.c:155: numeric comparison failure
   left: 4278190079 (0xfeffffff); from: ipcinfo.shmmax
  right: 2147483647 (0x7fffffff); from: tipcinfo.shmmax
error: 1 test failures


+ uname -a
Linux buildvm-a32-33.iad2.fedoraproject.org 5.7.7-200.fc32.armv7hl+lpae #1 SMP
Wed Jul 1 19:40:09 UTC 2020 armv7l armv7l armv7l GNU/Linux

+ LD_SHOW_AUXV=1
+ /bin/true
AT_SYSINFO_EHDR:      0xbed48000
AT_HWCAP:        half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt
vfpd32 lpae evtstrm
AT_PAGESZ:            4096
AT_CLKTCK:            100
AT_PHDR:              0x4c2034
AT_PHENT:             32
AT_PHNUM:             9
AT_BASE:              0xb6f3f000
AT_FLAGS:             0x0
AT_ENTRY:             0x4c31d8
AT_UID:               1000
AT_EUID:              1000
AT_GID:               425
AT_EGID:              425
AT_SECURE:            0
AT_RANDOM:            0xbeb98ae7
AT_HWCAP2:       aes pmull sha1 sha2 crc32
AT_EXECFN:            /bin/true
AT_PLATFORM:          v7l
processor       : 0
model name      : ARMv7 Processor rev 2 (v7l)
BogoMIPS        : 80.00
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt
vfpd32 lpae evtstrm aes pmull sha1 sha2 crc32
CPU implementer : 0x50
CPU architecture: 7
CPU variant     : 0x3
CPU part        : 0x000
CPU revision    : 2
...
processor       : 4
model name      : ARMv7 Processor rev 2 (v7l)
BogoMIPS        : 80.00
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt
vfpd32 lpae evtstrm aes pmull sha1 sha2 crc32
CPU implementer : 0x50
CPU architecture: 7
CPU variant     : 0x3
CPU part        : 0x000
CPU revision    : 2
Hardware        : Generic DT based system
Revision        : 0000
Serial          : 0000000000000000
MemTotal:       24205040 kB
MemFree:        21663528 kB
MemAvailable:   23758036 kB
Buffers:          141108 kB
Cached:          2065828 kB
SwapCached:        13132 kB
Active:           920908 kB
Inactive:        1375456 kB
Active(anon):      52040 kB
Inactive(anon):    37668 kB
Active(file):     868868 kB
Inactive(file):  1337788 kB
Unevictable:           0 kB
Mlocked:               0 kB
HighTotal:      23789568 kB
HighFree:       21616700 kB
LowTotal:         415472 kB
LowFree:           46828 kB
SwapTotal:       8629244 kB
SwapFree:        8597764 kB
Dirty:              1416 kB
Writeback:             0 kB
AnonPages:         76536 kB
Mapped:            78384 kB
Shmem:               268 kB
KReclaimable:     142612 kB
Slab:             212604 kB
SReclaimable:     142612 kB
SUnreclaim:        69992 kB
KernelStack:        1272 kB
PageTables:         3216 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    20731764 kB
Committed_AS:     294028 kB
VmallocTotal:     245760 kB
VmallocUsed:        6296 kB
VmallocChunk:          0 kB
Percpu:             4180 kB
CmaTotal:          65536 kB
CmaFree:           65280 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
Hugetlb:               0 kB
Filesystem     1K-blocks    Used Available Use% Mounted on
tmpfs           12102520       0  12102520   0% /sys/fs/selinux
tmpfs           12102520       0  12102520   0% /dev/shm
/dev/vda2      131062788 7610060 116725460   7% /proc/filesystems

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[Bug libc/26862] FAIL: misc/tst-sysvshm-linux on armv7hl (Fedora Rawhide/34).

[carlos at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26862

--- Comment #1 from Carlos O'Donell <carlos at redhat dot com> ---
This failure is only seen on 32-bit ARM.

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[Bug libc/26862] FAIL: misc/tst-sysvshm-linux on armv7hl (Fedora Rawhide/34).

[carlos at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26862

Carlos O'Donell <carlos at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://sourceware.org/bugz
                   |                            |illa/show_bug.cgi?id=26736

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[Bug libc/26862] FAIL: misc/tst-sysvshm-linux on armv7hl (Fedora Rawhide/34).

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26862

--- Comment #2 from Andreas Schwab <schwab@linux-m68k.org> ---
This is also a kernel bug.  SHMMAX is bigger than LONG_MAX, but
copy_compat_shminfo_to_user limits it to 0x7fffffff even for IPC_64.

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[Bug libc/26862] FAIL: misc/tst-sysvshm-linux on armv7hl (Fedora Rawhide/34).

[adhemerval.zanella at linaro dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26862

Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |adhemerval.zanella at linaro dot o
                   |                            |rg

--- Comment #3 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
(In reply to Carlos O'Donell from comment #1)
> This failure is only seen on 32-bit ARM.

I think it does show only on 32-bit kernels (at least I don't see it on
arm-linux-gnueabihf running on 64-bit kernels).  And it does seems to be a
kernel issue as pointed by Andreas, since on 'copy_shminfo_to_user' (used on
32-bit kernels) the shmmax will be limited only for IPC_OLD, different than
copy_compat_shminfo_to_user (used on 32-bit binaries running on 64-bit
kernels), where shmmax will be capped regardless of IPC_64 or IPC_OLD.

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[Bug libc/26862] FAIL: misc/tst-sysvshm-linux on armv7hl (Fedora Rawhide/34).

[carlos at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26862

--- Comment #4 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Adhemerval Zanella from comment #3)
> (In reply to Carlos O'Donell from comment #1)
> > This failure is only seen on 32-bit ARM.
> 
> I think it does show only on 32-bit kernels (at least I don't see it on
> arm-linux-gnueabihf running on 64-bit kernels).  And it does seems to be a
> kernel issue as pointed by Andreas, since on 'copy_shminfo_to_user' (used on
> 32-bit kernels) the shmmax will be limited only for IPC_OLD, different than
> copy_compat_shminfo_to_user (used on 32-bit binaries running on 64-bit
> kernels), where shmmax will be capped regardless of IPC_64 or IPC_OLD.

Can we detect this and XFAIL (and provide a comment in the test)?

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[Bug libc/26862] FAIL: misc/tst-sysvshm-linux on armv7hl (Fedora Rawhide/34).

[adhemerval.zanella at linaro dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26862

Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
   Target Milestone|---                         |2.33
           Assignee|unassigned at sourceware dot org   |adhemerval.zanella at linaro dot o
                   |                            |rg
             Status|NEW                         |RESOLVED

--- Comment #5 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
Fixed upstream (913201078502ad3f10043db02a8efce5d75387c2).

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