[Bug tdep/26363] New: internal-error: Got request for bad register number 41

[Bug tdep/26363] New: internal-error: Got request for bad register number 41

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26363

            Bug ID: 26363
           Summary: internal-error: Got request for bad register number 41
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tdep
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

On openSUSE tumbleweed:
...
(gdb) info all-registers^M
  ...
foseg          0x0                 0^M
fooff          0x0                 0^M
fop            0x0                 0^M
mxcsr          0x1f80              [ IM DM ZM OM UM PM ]^M
../../gdb/i386-linux-nat.c:530: internal-error: Got request for bad register
number 41.^M
A problem internal to GDB has been detected,^M
further debugging may prove unreliable.^M
FAIL: gdb.xml/tdesc-reload.exp: Run info registers (GDB internal error)
...

In i386-tdep.h we find:
...
enum i386_regnum
{
   ...
  I386_MXCSR_REGNUM = 40,       /* %mxcsr */
  I386_YMM0H_REGNUM,            /* %ymm0h */
...

-- 
You are receiving this mail because:
You are on the CC list for the bug.

[Bug tdep/26363] [i586] internal-error: Got request for bad register number 41

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26363

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|internal-error: Got request |[i586] internal-error: Got
                   |for bad register number 41  |request for bad register
                   |                            |number 41
               Host|                            |i586-linux-gnu
              Build|                            |i586-linux-gnu
             Target|                            |i586-linux-gnu

-- 
You are receiving this mail because:
You are on the CC list for the bug.

[Bug tdep/26363] [i586] gdb/i386-linux-nat.c:530: internal-error: Got request for bad register number 41

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26363

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[i586] internal-error: Got  |[i586]
                   |request for bad register    |gdb/i386-linux-nat.c:530:
                   |number 41                   |internal-error: Got request
                   |                            |for bad register number 41

-- 
You are receiving this mail because:
You are on the CC list for the bug.

[Bug tdep/26363] [i586] gdb/i386-linux-nat.c:530: internal-error: Got request for bad register number 41

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26363

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 12765
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12765&action=edit
gdb.sum, gdb.log, outputs/gdb.xml/tdesc-reload/

Reproduced using:
- osc build openSUSE_Factory i586
- osc chroot openSUSE_Factory i586
- make check RUNTESTFLAGS=gdb.xml/tdesc-reload.exp

Got different bad register number though: 53.

-- 
You are receiving this mail because:
You are on the CC list for the bug.

[Bug tdep/26363] [i586] gdb/i386-linux-nat.c:530: internal-error: Got request for bad register number 41

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26363

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #1)
> Created attachment 12765 [details]
> gdb.sum, gdb.log, outputs/gdb.xml/tdesc-reload/
> 
> Reproduced using:
> - osc build openSUSE_Factory i586
> - osc chroot openSUSE_Factory i586
> - make check RUNTESTFLAGS=gdb.xml/tdesc-reload.exp
> 
> Got different bad register number though: 53.

To reproduce on command line:
...
$ gdb \
  outputs/gdb.xml/tdesc-reload/tdesc-reload \
  -batch \
  -ex start \
  -iex "set tdesc filename outputs/gdb.xml/tdesc-reload/outfile1.xml" \
  -ex "info all-registers"
Temporary breakpoint 1 at 0x1196: file tdesc-reload.c, line 21.

Temporary breakpoint 1, main () at tdesc-reload.c:21
21        return 0;
eax            0x56559000          1448448000
ecx            0x9684472e          -1769715922
edx            0xffffd8f4          -9996
ebx            0x0                 0
esp            0xffffd8b8          0xffffd8b8
ebp            0xffffd8b8          0xffffd8b8
esi            0xf7fc2e44          -134468028
edi            0xf7fc2e44          -134468028
eip            0x56556196          0x56556196 <main+13>
eflags         0x216               [ PF AF IF ]
cs             0x23                35
ss             0x2b                43
ds             0x2b                43
es             0x2b                43
fs             0x0                 0
gs             0x63                99
st0            0                   (raw 0x00000000000000000000)
st1            0                   (raw 0x00000000000000000000)
st2            0                   (raw 0x00000000000000000000)
st3            0                   (raw 0x00000000000000000000)
st4            0                   (raw 0x00000000000000000000)
st5            0                   (raw 0x00000000000000000000)
st6            0                   (raw 0x00000000000000000000)
st7            0                   (raw 0x00000000000000000000)
fctrl          0x37f               895
fstat          0x0                 0
ftag           0xffff              65535
fiseg          0x0                 0
fioff          0x0                 0
foseg          0x0                 0
fooff          0x0                 0
fop            0x0                 0
mxcsr          0x1f80              [ IM DM ZM OM UM PM ]
../../gdb/i386-linux-nat.c:530: internal-error: Got request for bad register
number 53.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) [answered Y; input not from terminal]

This is a bug, please report it.  For instructions, see:
<http://bugs.opensuse.org/>.

../../gdb/i386-linux-nat.c:530: internal-error: Got request for bad register
number 53.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Create a core file of GDB? (y or n) [answered Y; input not from terminal]
Aborted (core dumped)
...

-- 
You are receiving this mail because:
You are on the CC list for the bug.

[Bug tdep/26363] [i586] gdb/i386-linux-nat.c:530: internal-error: Got request for bad register number 41

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26363

--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
Backtrace at abort:
...
Thread 1 "gdb" received signal SIGABRT, Aborted.
0xf736a889 in raise () from /lib/libc.so.6
(gdb) bt
#0  0xf736a889 in raise () from /lib/libc.so.6
#1  0xf73522c3 in abort () from /lib/libc.so.6
#2  0x56a0cc9c in dump_core () at ../../gdb/utils.c:204
#3  0x56a11b55 in internal_vproblem (
    problem=0x570a1638 <_ZL22internal_error_problem.lto_priv.0>, 
    file=0x56ca56dc "../../gdb/i386-linux-nat.c", line=530, 
    fmt=0x56ca52cc "Got request for bad register number %d.", ap=0xffffd17c
"5")
    at ../../gdb/utils.c:414
#4  0x56bab37f in internal_verror (ap=<optimized out>, fmt=<optimized out>, 
    line=<optimized out>, file=<optimized out>) at ../../gdb/utils.c:439
#5  internal_error (file=0x56ca56dc "../../gdb/i386-linux-nat.c", line=530, 
    fmt=0x56ca52cc "Got request for bad register number %d.")
    at ../../gdbsupport/errors.cc:55
#6  0x567bd6eb in i386_linux_nat_target::fetch_registers (
    this=0x570baf80 <_ZL25the_i386_linux_nat_target.lto_priv.0>,
regcache=0x5739e320, 
    regno=53) at ../../gdb/i386-linux-nat.c:530
#7  0x569c9600 in target_fetch_registers (regcache=0x5739e320, regno=53)
    at ../../gdb/target.c:3394
#8  0x568e80e9 in regcache::raw_update (regnum=53, this=0x5739e320)
    at ../../gdb/regcache.c:542
#9  regcache::raw_update (this=0x5739e320, regnum=53) at
../../gdb/regcache.c:531
#10 0x568e8316 in readable_regcache::raw_read (this=this@entry=0x5739e320, 
    regnum=regnum@entry=53, buf=0x572c3cc0 "") at ../../gdb/regcache.c:556
#11 0x568e848a in readable_regcache::cooked_read (this=this@entry=0x5739e320, 
    regnum=regnum@entry=53, buf=<optimized out>) at ../../gdb/regcache.c:648
#12 0x568e86ce in readable_regcache::cooked_read_value (this=0x5739e320,
regnum=53)
    at ../../gdb/regcache.c:706
#13 0x56958470 in sentinel_frame_prev_register (this_frame=0x572292f8, 
    this_prologue_cache=0x57229304, regnum=53) at ../../gdb/sentinel-frame.c:53
#14 0x5678cc13 in frame_unwind_register_value (next_frame=0x572292f8,
regnum=53)
    at ../../gdb/frame.c:1241
#15 0x56a25ee9 in value_fetch_lazy_register (val=0x5745a6f0) at
../../gdb/value.c:3826
#16 value_fetch_lazy (val=0x5745a6f0) at ../../gdb/value.c:3932
#17 0x5678c1c0 in value_of_register (frame=0x57229374, regnum=53) at
../../gdb/findvar.c:274
#18 value_of_register (regnum=53, frame=0x57229374) at ../../gdb/findvar.c:263
#19 0x567db042 in default_print_registers_info (gdbarch=0x57338698,
file=0x57330e10, 
    frame=0x57229374, regnum=-1, print_all=1) at ../../gdb/infcmd.c:2199
#20 0x5679e824 in gdbarch_print_registers_info (gdbarch=0x57338698,
file=0x57330e10, 
    frame=0x57229374, regnum=-1, all=1) at ../../gdb/gdbarch.c:2422
#21 0x567dd79d in registers_info (addr_exp=0x0, fpregs=1) at
../../gdb/infcmd.c:2218
#22 0x566bab23 in cmd_func (cmd=<optimized out>, args=0x0, from_tty=<optimized
out>)
    at ../../gdb/cli/cli-decode.c:2181
#23 0x569d5354 in execute_command (p=<optimized out>, 
    p@entry=<error reading variable: value has been optimized out>, from_tty=0, 
    from_tty@entry=<error reading variable: value has been optimized out>)
    at ../../gdb/top.c:668
#24 0x56838696 in catch_command_errors (command=<optimized out>, arg=<optimized
out>, 
    from_tty=<optimized out>) at ../../gdb/main.c:457
#25 0x56c01985 in captured_main_1(captured_main_args*) [clone .constprop.0] (
    context=context@entry=0xffffd7d0) at ../../gdb/main.c:1218
#26 0x565f5e67 in captured_main (data=0xffffd7d0) at ../../gdb/main.c:1239
#27 gdb_main (args=0xffffd7d0) at ../../gdb/main.c:1268
#28 main (argc=9, argv=0xffffd8b4) at ../../gdb/gdb.c:32
...

-- 
You are receiving this mail because:
You are on the CC list for the bug.

[Bug tdep/26363] [i586] gdb/i386-linux-nat.c:530: internal-error: Got request for bad register number 41

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26363

--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
So, reading reg 53 fails, because this fails:
...
511           if (fetch_xstateregs (regcache, tid))
...
because:
...
336       if (have_ptrace_getregset != TRIBOOL_TRUE)
(gdb) p have_ptrace_getregset
$3 = TRIBOOL_UNKNOWN
...

It seems have_ptrace_getregset is set in x86_linux_nat_target::read_description
, but that one's never called.

-- 
You are receiving this mail because:
You are on the CC list for the bug.