[PATCH21.5] Incremental Garbage Collector (revised)

[Malcolm Purvis]

>>>>> "Marcus" == Marcus Crestani <crestani at informatik.uni-tuebingen.de> writes:

Marcus> I'll commit in a few days to clear the way for Stephen's Xft merge, if
Marcus> nobody objects.

I've managed to get this crash on Fedora Core 3 while using, as you might have
guessed, Gnus.

I've also seen asserts while recompiling the core lisp core on FC3 and Solaris
10, but frustratingly I haven't managed to reproduce these when I tried to
produce better debugging information for you.

Malcolm

Fatal Error: Received SIGSEGV (11) for address 0x34

Program received signal SIGABRT, Aborted.
[Switching to Thread -1208432000 (LWP 4312)]
0xb7fcd402 in __kernel_vsyscall ()
(gdb) where
#0  0xb7fcd402 in __kernel_vsyscall ()
#1  0x00632c76 in kill () from /lib/tls/libc.so.6
#2  0x080e7e94 in fatal_error_signal (sig=11)
    at /home/malcolmp/builds/xemacs/sandboxen/garbage/src/emacs.c:3765
#3  <signal handler called>
#4  0x08117124 in detagged_lisp_object_size (h=0xb93f0b0) at lrecord.h:1786
#5  0x081e05e9 in remove_cell (ptr=0xb93f0b0, ph=0xbc03c08)
    at /home/malcolmp/builds/xemacs/sandboxen/garbage/src/mc-alloc.c:1452
#6  0x081e0aa3 in sweep_page (ph=0xbc03c08)
    at /home/malcolmp/builds/xemacs/sandboxen/garbage/src/mc-alloc.c:1618
#7  0x081df070 in visit_all_used_page_headers (f=0x81e0974 <sweep_page>)
    at /home/malcolmp/builds/xemacs/sandboxen/garbage/src/mc-alloc.c:449
#8  0x081e0b09 in mc_sweep ()
    at /home/malcolmp/builds/xemacs/sandboxen/garbage/src/mc-alloc.c:1634
#9  0x08175c99 in gc_sweep ()
    at /home/malcolmp/builds/xemacs/sandboxen/garbage/src/gc.c:1718
#10 0x08176105 in gc_1 (incremental=1)
    at /home/malcolmp/builds/xemacs/sandboxen/garbage/src/gc.c:1897
#11 0x08176142 in gc (incremental=1)
    at /home/malcolmp/builds/xemacs/sandboxen/garbage/src/gc.c:1917
#12 0x08176199 in gc_incremental ()
    at /home/malcolmp/builds/xemacs/sandboxen/garbage/src/gc.c:1946
#13 0x080f2571 in Ffuncall (nargs=3, args=0xbf9cb414)
    at /home/malcolmp/builds/xemacs/sandboxen/garbage/src/eval.c:3822
[...]

(gdb) up
#4  0x08117124 in detagged_lisp_object_size (h=0xb93f0b0) at lrecord.h:1786
1786      return (imp->size_in_bytes_method ?
(gdb) print imp
$1 = (const struct lrecord_implementation *) 0x0
(gdb) print *h
$2 = {type = 112, lisp_readonly = 0, free = 0, uid = 165967}
(gdb) print lrecord_implementations_table
$3 = {0x8320e20, 0x8320f40, 0x8320ee0, 0x8320e80, 0x8320a00, 0x82fe540,
  0x82ef920, 0x82ef9e0, 0x82efb00, 0x82f2580, 0x82f4bc0, 0x830aca0, 0x830aae0,
  0x82fc3e0, 0x8313d00, 0x8317e60, 0x8315260, 0x83087c0, 0x82f34a0, 0x82f32c0,
  0x8319180, 0x8317340, 0x83173e0, 0x82f07e0, 0x8306700, 0x8306220, 0x8305e60,
  0x83146e0, 0x82ff4e0, 0x8312340, 0x83000c0, 0x83001a0, 0x831fba0, 0x82f4020,
  0x82fa6c0, 0x830bda0, 0x832b380, 0x832b4a0, 0x0, 0x83104e0, 0x0, 0x8310ec0,
  0x83109c0, 0x8316b20, 0x8316ce0, 0x830e7c0, 0x830f160, 0x8307400, 0x82f55e0,
  0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x82f30c0, 0x0, 0x0, 0x0, 0x82f4ce0,
  0x82f4dc0, 0x0, 0x0, 0x0, 0x82efc20, 0x82efb80, 0x82fc2c0, 0x8321b40,
  0x82f03a0, 0x82f1480, 0x83239e0, 0x82f4660, 0x0, 0x832aaa0, 0x832ab80,
  0x832ac00, 0x832ace0, 0x8325220, 0x0, 0x8323c60, 0x0, 0x0, 0x8328860, 0x0,
  0x0, 0x8305ee0, 0x8305fc0, 0x8306060, 0x8306100, 0x8306180, 0x8323ec0,
  0x8323f40, 0x831fa20, 0x830b940, 0x0 <repeats 32 times>}


-- 
		     Malcolm Purvis <malcolmp at xemacs.org>