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bug#29886: tests/rm/rm-readdir-fail is failing with SIGBUS on Gentoo spa
From: |
Thomas Deutschmann |
Subject: |
bug#29886: tests/rm/rm-readdir-fail is failing with SIGBUS on Gentoo sparc |
Date: |
Wed, 11 Jul 2018 18:53:40 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:21.0) Gecko/20100101 Thunderbird/52.8.0 |
On 2018-07-11 04:46, Paul Eggert wrote:
> Thomas Deutschmann wrote:
>> - p->fts_statp->st_ino = D_INO (dp);
>> + memcpy(&p->fts_statp->st_ino, &dp,
>> sizeof(p->fts_statp->st_ino));
>
> This looks like a kernel bug, not a coreutils bug. readdir must be
> returning a pointer to an misaligned struct. Can you look into that? For
> example, what happens if you insert this:
>
> if ((intptr_t) (dp) % _Alignof (struct dirent) != 0)
> abort ();
>
> before the memcpy? The 'abort ()' should never happen; if it does,
> there's a bug in readdir, surely.
Not sure if this is a kernel problem. Isn't test suite using
LD_PRELOAD to pull in additional libraries which could cause
such a breakage? And wouldn't "rm" show any failure during normal
use?
The sparc user added the requested debug code and confirmed that
abort() will be triggered.
#0 0xf7e230fc in raise () from /lib/libc.so.6
#1 0xf7e25240 in abort () from /lib/libc.so.6
#2 0x0001813c in fts_build (address@hidden, address@hidden) at lib/fts.c:1555
#3 0x00018bd0 in fts_read (address@hidden) at lib/fts.c:966
#4 0x00012750 in rm (address@hidden, address@hidden) at src/remove.c:596
#5 0x00011564 in main (argc=<optimized out>, argv=<optimized out>) at
src/rm.c:370
(gdb) frame 2
(gdb) p dp
$1 = (struct dirent *) 0x31dcc
User said it is also always going through
#0 0xf7fb4684 in readdir64 () from ./k.so
Kernel: Linux castor 4.16.8 #1 SMP Tue May 15 22:40:58 CEST 2018 sparc64 sun4v
UltraSparc T2 (Niagara2) GNU/Linux
--
Regards,
Thomas Deutschmann / Gentoo Linux Developer
C4DD 695F A713 8F24 2AA1 5638 5849 7EE5 1D5D 74A5
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- bug#29886: tests/rm/rm-readdir-fail is failing with SIGBUS on Gentoo sparc, Thomas Deutschmann, 2018/07/09
- bug#29886: tests/rm/rm-readdir-fail is failing with SIGBUS on Gentoo sparc, Thomas Deutschmann, 2018/07/10
- bug#29886: tests/rm/rm-readdir-fail is failing with SIGBUS on Gentoo sparc, Paul Eggert, 2018/07/10
- bug#29886: tests/rm/rm-readdir-fail is failing with SIGBUS on Gentoo sparc,
Thomas Deutschmann <=
- bug#29886: tests/rm/rm-readdir-fail is failing with SIGBUS on Gentoo sparc, Paul Eggert, 2018/07/11
- bug#29886: tests/rm/rm-readdir-fail is failing with SIGBUS on Gentoo sparc, Thomas Deutschmann, 2018/07/11
- bug#29886: tests/rm/rm-readdir-fail is failing with SIGBUS on Gentoo sparc, Pádraig Brady, 2018/07/14
- bug#29886: tests/rm/rm-readdir-fail is failing with SIGBUS on Gentoo sparc, Thomas Deutschmann, 2018/07/15
- bug#29886: tests/rm/rm-readdir-fail is failing with SIGBUS on Gentoo sparc, Pádraig Brady, 2018/07/15