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 */ ...
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.
(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) ...
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 ...
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.