bug#17753: Cygwin emacs-X11 core dump

[markus . hoenicka]

Ken Brown writes:
 > A bug in the Cygwin DLL (64-bit only) was just discovered and fixed. 
 > The bug could have prevented stack space from being committed after the 
 > initial commit.  Could you try the latest snapshot from 
 > https://cygwin.com/snapshots/ and see if these strange crashes stop?  I 
 > realize that you may have to run emacs for several weeks before you can 
 > be confident.
 > 
 > Ken
 > 

Hi,

it took a while, but today Emacs crashed again, although I have been
running the snapshot from July 9 since you mentioned it might affect
the bug. Apparently, it doesn't. The backtrace is similar to the ones I
used to get with the stock cygwin1.dll. This time Emacs crashed during
startup, I didn't even have a chance to do anything before it
disappeared. Backtrace is attached below.

regards,
Markus

info threads
  Id   Target Id         Frame
  10   Thread 0x3c4      0xfaf3003300001f80 in ?? ()
  9    Thread 0x1254     0x0000003300001f80 in ?? ()
  8    Thread 0x12c0     0x9e84003300001f80 in ?? ()
  7    Thread 0x12f0     0x0005003300001f80 in ?? ()
  6    Thread 0x2e8      0x0005003300001f80 in ?? ()
  5    Thread 0xf38      0x0000003300001f80 in ?? ()
  4    Thread 0x119c     0x0000003300001f80 in ?? ()
  3    Thread 0x580      0x0000003300001f80 in ?? ()
  2    Thread 0x10d8     0x0000003300001f80 in ?? ()
* 1    Thread 0xff8      0x0000003300001fa4 in ?? ()

(gdb) thread apply all bt

Thread 10 (Thread 0x3c4):
#0  0xfaf3003300001f80 in ?? ()
#1  0x0000000000000000 in ?? ()

Thread 9 (Thread 0x1254):
#0  0x0000003300001f80 in ?? ()
#1  0x000007fefdaf10dc in ?? ()
#2  0x0000000000000000 in ?? ()

Thread 8 (Thread 0x12c0):
#0  0x9e84003300001f80 in ?? ()
#1  0x000007fefdaf10dc in ?? ()
#2  0x0000000000000000 in ?? ()

Thread 7 (Thread 0x12f0):
#0  0x0005003300001f80 in ?? ()
#1  0x000007fefcfc5971 in ?? ()
#2  0x0000000000000000 in ?? ()

Thread 6 (Thread 0x2e8):
#0  0x0005003300001f80 in ?? ()
#1  0x000007fefdaf10dc in ?? ()
#2  0x0000000000000000 in ?? ()

Thread 5 (Thread 0xf38):
#0  0x0000003300001f80 in ?? ()
#1  0x000007fefdaf1203 in ?? ()
#2  0x00000000033daba8 in ?? ()
#3  0x0000000600042280 in ?? ()
#4  0x0000000000000003 in ?? ()
#5  0x00000001802edc50 in ?? ()
#6  0xfffffffffffe7960 in ?? ()
#7  0x00000000033dab10 in ?? ()
#8  0x0000000000000048 in ?? ()
#9  0x0000000000000001 in ?? ()
#10 0x0000000000000000 in ?? ()

Thread 4 (Thread 0x119c):
#0  0x0000003300001f80 in ?? ()
Cannot access memory at address 0xffffc458
(gdb) thread apply 3 bt

Thread 3 (Thread 0x580):
#0  0x0000003300001f80 in ?? ()
#1  0x000000007785b037 in ?? ()
#2  0x0000000000000000 in ?? ()
(gdb) thread apply 2 bt

Thread 2 (Thread 0x10d8):
#0  0x0000003300001f80 in ?? ()
#1  0x000007fefdaf1a7a in ?? ()
#2  0x000000000042ce00 in ?? ()
#3  0x0000000100629773 in run_timers ()
    at /usr/src/debug/emacs-24.3.90-1/src/atimer.c:364
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb) thread apply 1 bt

Thread 1 (Thread 0xff8):
#0  0x0000003300001fa4 in ?? ()
#1  0x0000000000430000 in ?? ()
#2  0x0000000100970c78 in ?? ()
#3  0x000000000000e118 in ?? ()
#4  0x00000000005c6e30 in ?? ()
#5  0x0000000600cd502d in ?? ()
#6  0x0000000000000015 in ?? ()
#7  0x0000000600fdcbf4 in ?? ()
#8  0x0000000600cd502d in ?? ()
#9  0x0000000000426330 in ?? ()
#10 0x0000000600000005 in ?? ()
#11 0x0000000100970c78 in ?? ()
#12 0x0000000000000000 in ?? ()


-- 
Markus Hoenicka
http://www.mhoenicka.de
AQ score 38