Hi John !
On Tue, Jun 28, 2022 at 1:16 PM John Reiser <jrei...@bitwagon.com> wrote:
>
> On 6/28/22, Mathieu Malaterre wrote:
> > % strace ./memcheck/memcheck-arm-linux
> > execve("./memcheck/memcheck-arm-linux",
> > ["./memcheck/memcheck-arm-linux"], 0xbe962730 /* 19 vars */) = 0
> > --- SIGILL {si_signo=SIGILL, si_code=ILL_ILLOPC, si_addr=0x58072020} ---
> > +++ killed by SIGILL +++
> > zsh: illegal hardware instruction strace ./memcheck/memcheck-arm-linux
>
> memcheck wants determine the actual hardware capabilities.
> The description given by AT_PLATFORM, AT_HWCAP, AT_HWCAP2
> has not always been complete and correct, so memcheck
> tries the hardware instructions that matter, and memcheck
> is prepared to handle SIGILL if it occurs. Thus there
> are likely to be a few deliberate SIGILL near the beginning.
> If strace always halts upon SIGILL, without letting
> memcheck's handler catch the SIGILL and recover from it,
> then strace is too eager. For instance, on x86_64
> strace always aborts on 'int3' regardless of signal handlers.
Thanks for the detailed explanation. I must admit this is way too low
level stuff for me.
> What happens without using 'strace'?
Same symptoms (AFAIK):
% ./memcheck/memcheck-arm-linux
zsh: illegal hardware instruction ./memcheck/memcheck-arm-linux
Just in case that help, here is the gdb output (*)
Let me know if you need more output.
(*)
% gdb ./memcheck/memcheck-arm-linux
GNU gdb (Debian 12.1-2) 12.1
Copyright (C) 2022 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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Type "show copying" and "show warranty" for details.
This GDB was configured as "arm-linux-gnueabihf".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
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For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./memcheck/memcheck-arm-linux...
(gdb) r
Starting program: /home/malat/valgrind-3.19.0/memcheck/memcheck-arm-linux
Program received signal SIGILL, Illegal instruction.
vgPlain_am_startup (sp_at_startup=3204445840) at
m_aspacemgr/aspacemgr-linux.c:1626
1626 init_nsegment(&seg);
(gdb) bt full
#0 vgPlain_am_startup (sp_at_startup=3204445840) at
m_aspacemgr/aspacemgr-linux.c:1626
seg = {kind = 0, start = 0, end = 0, smode = SmLower, dev = 0,
ino = 0, offset = 5378467285696512, mode = 3204445844, fnIdx =
-1090521456, hasR = 0 '\000', hasW = 0 '\000', hasX = 38 '&',
hasT = 88 'X', isCH = 164 '\244'}
suggested_clstack_end = <optimized out>
__PRETTY_FUNCTION__ = "vgPlain_am_startup"
#1 0x580ccec4 in valgrind_main (envp=0xbefff69c, argv=0xbefff694,
argc=1) at m_main.c:1431
loglevel = <optimized out>
i = <optimized out>
vex_archinfo = {hwcaps = 1482711920, endness = 0, hwcache_info
= {num_levels = 0, num_caches = 0, caches = 0x0,
icaches_maintain_coherence = 0 '\000'}, ppc_icache_line_szB = 0,
ppc_dcbz_szB = 0,
ppc_scv_supported = 0 '\000', ppc_dcbzl_szB = 0,
arm64_dMinLine_lg2_szB = 0, arm64_iMinLine_lg2_szB = 0,
arm64_requires_fallback_LLSC = 0 '\000'}
need_help = <optimized out>
tid_main = 0
addr2dihandle = 0x0
wd = <optimized out>
need_help = <optimized out>
tid_main = <optimized out>
loglevel = <optimized out>
i = <optimized out>
addr2dihandle = <optimized out>
__PRETTY_FUNCTION__ = "valgrind_main"
vex_archinfo = <optimized out>
wd = <optimized out>
tmp_str = <optimized out>
res = <optimized out>
val = <optimized out>
res = <optimized out>
val = <optimized out>
s = <optimized out>
n = <optimized out>
res = <optimized out>
val = <optimized out>
s = <optimized out>
n = <optimized out>
val = <optimized out>
ok = <optimized out>
errmsg = <optimized out>
limLo = <optimized out>
limHi = <optimized out>
aLocal = <optimized out>
p = <optimized out>
cp = <optimized out>
vex_arch = <optimized out>
ok = <optimized out>
buf = <optimized out>
buf2 = <optimized out>
fd = <optimized out>
r = <optimized out>
nul = <optimized out>
exename = <optimized out>
client_auxv = <optimized out>
client_auxv_len = <optimized out>
--Type <RET> for more, q to quit, c to continue without paging--
arg = <optimized out>
s = <optimized out>
ok = <optimized out>
seg_starts = <optimized out>
n_seg_starts = <optimized out>
anu = <optimized out>
change_ownership_v_c_OK = <optimized out>
co_start = <optimized out>
co_endPlus = <optimized out>
buf = <optimized out>
seg_starts = <optimized out>
n_seg_starts = <optimized out>
j = <optimized out>
n = <optimized out>
seg = <optimized out>
anl = <optimized out>
inaccessible_len = <optimized out>
seg = <optimized out>
seg = <optimized out>
#2 _start_in_C_linux (pArgc=0xbefff690) at m_main.c:3125
r = <optimized out>
argc = 1
argv = 0xbefff694
envp = 0xbefff69c
#3 0x00000000 in ?? ()
No symbol table info available.
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
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