[Bug server/13984] New: gdb stops controlling a thread after "Remote'g' packet reply is too long: ..." error message

["curty at ieee dot org" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13984

             Bug #: 13984
           Summary: gdb stops controlling a thread after "Remote 'g'
                    packet reply is too long: ..." error message
           Product: gdb
           Version: 7.4
            Status: NEW
          Severity: critical
          Priority: P2
         Component: server
        AssignedTo: unassigned@sourceware.org
        ReportedBy: curty@ieee.org
    Classification: Unclassified


Linux Kernel debugging running gdbserver at Eclipse causes gdbserver stop
receiving thread commands after "Remote 'g' packet reply is too long: ..."
error message. This message arrives after hit a tbreak at start_kernel()
function.

The state is "Thread [1] (Suspended)" but when I try to control this thread
(eg. execute, suspend, etc), a "Cannot execute this command while the selected
thread is running" message returns and it is not possible to continue debuging.

> QEMU Guest (Intel i7) command:

# /home/curtyc/000_HPC/usr/local/packages/qemu-devel/bin/qemu-system-x86_64
-smp 1 -kernel
'/home/curtyc/Linux_kernel_source/linux-3.3/arch/x86_64/boot/vmlinux'
/home/curtyc/QEMU/images/Fedora-x86_64-linux-3.3.0.raw -S -gdb tcp::1234


> GDB console at Eclipse:

------ cut here -------
.gdbinit: No such file or directory.
Reading symbols from /home/curtyc/Linux_kernel_source/linux-3.3/vmlinux...done.
866-gdb-set confirm off
866^done
(gdb) 
867-gdb-set width 0
867^done
(gdb) 
868-gdb-set height 0
868^done
(gdb) 
869-interpreter-exec console echo
869^done
(gdb) 
870-gdb-show prompt
870^done,value="(gdb) "
(gdb) 
871-gdb-set auto-solib-add off
871^done
(gdb) 
872-gdb-set stop-on-solib-events 0
872^done
(gdb) 
873-target-select remote localhost:1234
=thread-group-started,id="i1",pid="42000"
=thread-created,id="1",group-id="i1"
*stopped,frame={addr="0x0000000000000000",func="irq_stack_union",args=[]},thread-id="1",stopped-threads="all"
873^connected
(gdb) 
874 info proc
&"info proc\n"
&"Can't determine the current process's PID: you must name one.\n"
874^error,msg="Can't determine the current process's PID: you must name one."
(gdb) 
875-environment-cd /home/curtyc/Linux_kernel_source/linux-3.3
875^done
(gdb) 
876 info program
&"info program\n"
~"Debugging a target over a serial line.\n"
~"Program stopped at 0x0.\n"
~"It stopped with signal SIGTRAP, Trace/breakpoint trap.\n"
876^done
(gdb) 
877 info threads
&"info threads\n"
~"  Id   Target Id         Frame \n"
~"* 1    Thread 1 (CPU#0 [running]) 0x0000000000000000 in irq_stack_union ()\n"
877^done
(gdb) 
878-stack-info-depth
878^done,depth="2"
(gdb) 
879-stack-list-frames 0 2
879^done,stack=[frame={level="0",addr="0x0000000000000000",func="irq_stack_union"},frame={level="1",addr="0x0000000000000000",func="??"}]
(gdb) 
880-data-list-changed-registers
880^done,changed-registers=["0","1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29","30","31","32","33","34","35","36","37","38","39","40","41","42","43","44","45","46","47","48","49","50","51","52","53","54","55","56","73","74","75","76","77","78","79","80","81","82","83","84","85","86","87","88","89","90","91","92","93","94","95","96","97","98","99","100","102","103","104","105","106","107","108","109","110","111","112","113","114","115","116","117","118","119","120","121","122","123","124","125"]
(gdb) 
881 info sharedlibrary
&"info sharedlibrary\n"
~"No shared libraries loaded at this time.\n"
881^done
(gdb) 
882-environment-directory

...
<many_directory_paths_excluded_without_problem_for_understanding>
...

(gdb) 
883-data-list-register-names
883^done,register-names=["rax","rbx","rcx","rdx","rsi","rdi","rbp","rsp","r8","r9","r10","r11","r12","r13","r14","r15","rip","eflags","cs","ss","ds","es","fs","gs","st0","st1","st2","st3","st4","st5","st6","st7","fctrl","fstat","ftag","fiseg","fioff","foseg","fooff","fop","xmm0","xmm1","xmm2","xmm3","xmm4","xmm5","xmm6","xmm7","xmm8","xmm9","xmm10","xmm11","xmm12","xmm13","xmm14","xmm15","mxcsr","","","","","","","","","","","","","","","","","orig_rax","al","bl","cl","dl","sil","dil","bpl","spl","r8l","r9l","r10l","r11l","r12l","r13l","r14l","r15l","ah","bh","ch","dh","ax","bx","cx","dx","si","di","bp","","r8w","r9w","r10w","r11w","r12w","r13w","r14w","r15w","eax","ebx","ecx","edx","esi","edi","ebp","esp","r8d","r9d","r10d","r11d","r12d","r13d","r14d","r15d"]
(gdb) 
884-break-insert -t init/main.c:start_kernel
884^done,bkpt={number="1",type="breakpoint",disp="del",enabled="y",addr="0xffffffff81cf083e",func="start_kernel",file="init/main.c",fullname="/home/curtyc/Linux_kernel_source/linux-3.3/init/main.c",line="464",times="0",original-location="init/main.c:start_kernel"}
(gdb) 
885-exec-continue
885^running
*running,thread-id="all"
(gdb) 
885^error,msg="Remote 'g' packet reply is too long:
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"
(gdb) 
886 info threads
&"info threads\n"
~"  Id   Target Id         Frame \n"
~"* 1    Thread 1 (CPU#0 [running]) (running)\n"
886^done
(gdb) 
887-stack-info-depth
887^error,msg="Target is executing."
(gdb) 
888-stack-info-depth
888^error,msg="Target is executing."
(gdb) 
889-stack-list-frames 0 1
889^error,msg="Target is executing."
(gdb) 
890-data-list-changed-registers
890^error,msg="Target is executing."
(gdb) 
------ cut here -------

Thanks in advance for your attention.

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