Attachment 4783 Details for Bug 10746 – Another annotated debugging log

Another annotated debugging log

gdb_log2.txt (text/plain), 5.04 KB, created by Hans Boehm on 2003-09-19 01:16:14 UTC

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Creator: Hans Boehm

Created: 2003-09-19 01:16:14 UTC

Size: 5.04 KB

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obsolete

>This is after GC_generic_push_regs fix, getenv enabled, debuggable GC.
>
>Saw several other kinds of symptoms, which were unfortunately hard to debug:
>
>1) String was corrupted at some point with a few garbage characters at beginning.
>2) segfault (misinterpreted as NPE, and apparently caught!!) in
>GC_gcj_malloc_ingore_off_page, at line 280.
>3) bad branch.
>
>...
>second thread 239000 ffegfb
>first thread 723000 fffffffffdefgae
>second thread 240000 ffee
>first thread 724000 dddddggcged
>second thread 241000 cccdec
>
>Program received signal SIGSEGV, Segmentation fault.
>0x00410728 in java::lang::Object::getClass() ()
>    at /home/hans/gcc/gcc/gcc/config/i386/cygwin.asm:29
>
>(gdb) x/20i 0x410720
>0x410720 <_ZN4java4lang6Object8getClassEv>:     push   %ebp
>0x410721 <_ZN4java4lang6Object8getClassEv+1>:   mov    %esp,%ebp
>0x410723 <_ZN4java4lang6Object8getClassEv+3>:   mov    0x8(%ebp),%eax
>0x410726 <_ZN4java4lang6Object8getClassEv+6>:   mov    (%eax),%eax
>0x410728 <_ZN4java4lang6Object8getClassEv+8>:   mov    (%eax),%eax
>0x41072a <_ZN4java4lang6Object8getClassEv+10>:  pop    %ebp
>0x41072b <_ZN4java4lang6Object8getClassEv+11>:  ret
>...
>(gdb) p/x $esp
>$3 = 0x22fce8
>(gdb) p/x $ebp
>$4 = 0x22fce8
>(gdb) x/4wx $4
>0x22fce8:       0x0022fd08      0x0040adfc      0x0102bfd8      0x77f8f2eb
>(gdb) x/10wx 0x0102bfd8
>0x102bfd8:      0x00000000      0x010a7a28      0x00000008      0x00000001
>0x102bfe8:      0x00000000      0x00000000      0x00000000      0x00000000
>0x102bff8:      0x00000000      0x00000000
>(gdb) x/20wx  0x0102b000
>0x102b000:      0x00000000      0x01040578      0x00000008      0x00000002
>0x102b010:      0x00000000      0x00000000      0x00598268      0x010405a0
>0x102b020:      0x00000008      0x00000001      0x0102b000      0x00000000
>0x102b030:      0x00598268      0x010405c8      0x00000008      0x00000001
>0x102b040:      0x00000000      0x00000000      0x00598268      0x010405f0
>[Same problem as before.]
>(gdb) p GC_arrays._heap_sects
>$11 = {{hs_start = 0xbd0000 "", hs_bytes = 65536}, {hs_start = 0xbf0000 "à²^",
>    hs_bytes = 65536}, {hs_start = 0xc00000 "", hs_bytes = 65536}, {
>    hs_start = 0x1020000 "", hs_bytes = 69632}, {hs_start = 0x1040000 "à²^",
>    hs_bytes = 90112}, {hs_start = 0x1060000 "h\202Y", hs_bytes = 122880}, {
>    hs_start = 0x1080000 "h\202Y", hs_bytes = 163840}, {hs_start = 0x0,
>    hs_bytes = 0} <repeats 377 times>}
>(gdb) p 0x1020000 + 69632
>$12 = 16977920
>(gdb) p/x $12
>$13 = 0x1031000
>[ Block is well inside a heap section. ]
>(gdb) info threads
>  3 thread 1772.0x6e8  0x00405a9f in gnu::gcj::runtime::StringBuffer::append(jav
>a::lang::String*) () at /home/hans/gcc/gcc/gcc/config/i386/cygwin.asm:29
>  2 thread 1772.0x634  0x77f88e63 in ?? ()
>* 1 thread 1772.0x678  0x00410728 in java::lang::Object::getClass() ()
>    at /home/hans/gcc/gcc/gcc/config/i386/cygwin.asm:29
>(gdb) p &thread_table
>$16 = (struct <unknown> (*)[]) 0x607620
>(gdb) p sizeof(struct thread_entry)
>$17 = 736
>(gdb) p (struct thread_entry *)0x607620
>$18 = (struct thread_entry *) 0x607620
>(gdb) p *$18
>$19 = {in_use = 1, id = 1588, handle = 0xa4, stack = 0xe20000, context = {
>    ContextFlags = 65539, Dr0 = 4271566032, Dr1 = 4271566032, Dr2 = 642,
>    Dr3 = 2151861871, Dr6 = 3184217444, Dr7 = 0, FloatSave = {
>      ControlWord = 3188259364, StatusWord = 4272195008, TagWord = 1,
>      ErrorOffset = 2250942056, ErrorSelector = 3221241968, DataOffset = 0,
>      DataSelector = 1,
>      RegisterArea = "\001\000\000\000`ú\b_\200ì\232_\000¤/\202+\tC\200Xú\b_à¤/\
>202\227\nC\200\000\000\000\000\000\000\000\000L¥/\202\001\205¤_\000\000\000\000L
>¥/\202F\002\000\000W¡B\200\000\000\000\000Xú\b_A\205¤_@KE½",
>      Cr0NpxState = 2152614501}, SegGs = 3188259416, SegFs = 0, SegEs = 0,
>    SegDs = 2147888912, Edi = 2, Esi = 2012778072, Ebx = 2, Edx = 0,
>    Ecx = 1024, Eax = 0, Ebp = 14810604, Eip = 2012778083, SegCs = 27,
>    EFlags = 582, Esp = 14810528, SegSs = 35,
>    ExtendedRegisters = '\000' <repeats 511 times>}, suspended = 0}
>(gdb) p $18)[1]
>Junk after end of expression.
>(gdb) p $18[1]
>$21 = {in_use = 1, id = 1768, handle = 0xb0, stack = 0x1020000, context = {
>    ContextFlags = 65539, Dr0 = 4277974792, Dr1 = 2152259297, Dr2 = 2032639,
>    Dr3 = 3188259628, Dr6 = 1, Dr7 = 2173227072, FloatSave = {
>      ControlWord = 3188260020, StatusWord = 3802093920, TagWord = 176,
>      ErrorOffset = 4272194984, ErrorSelector = 4272194984,
>      DataOffset = 3188260020, DataSelector = 2152061872,
>      RegisterArea = "D\b@\200ÿÿÿÿdú\b_hHM\200\b·ü_Üú\b_"\205¤_E\235Xÿ\000\000\0
>00\000fIO\200A\205¤_oZÆâ\001\000\000\000\bû\b_OOD\200"\205¤_Hû\b_º\201\006\200\0
>34\000\000\000º\201\006\200", Cr0NpxState = 28}, SegGs = 48,
>    SegFs = 2152099173, SegEs = 4285003546, SegDs = 48, Edi = 24,
>    Esi = 6261248, Ebx = 22, Edx = 0, Ecx = 9, Eax = 10, Ebp = 16907588,
>    Eip = 2012777415, SegCs = 27, EFlags = 514, Esp = 16907536, SegSs = 35,
>    ExtendedRegisters = '\000' <repeats 511 times>}, suspended = 0}
>[ Further thread_table entries appear to be zero. In_use bits are 0.]
>(gdb) p/x 1588
>$25 = 0x634
>(gdb) p/x 1768
>$26 = 0x6e8
>

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