Bug#712514: Some more debug
I've rebuilt xorg-server with nostrip nocheck noopt
and added a load of debug, with that the backtrace shows
Program received signal SIGSEGV, Segmentation fault.
0x00000020 in ?? ()
(gdb) where
#0 0x00000020 in ?? ()
#1 0x2a09b5f0 in xf86SIGIO (sig=707031856)
at ../../../../../hw/xfree86/os-support/linux/../shared/sigio.c:121
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb) q
which seems to make sense, because it's happening as I touch and
the sigio seems to be bubbling touch events through evdev.
I've added a load of debug and it does seem to be getting to the end
of the sigio routine, just not returning properly (that line 121 is
the resteration of the errno); I've also added loads of debug to
Evdev, again it seems to be going through the motions ok.
here is my (rather cryptic) debug I've added for the last of the
events that happened before it died.
xf86SIGIO for 29
xf86SIGIO found i=0 r=1 func=0x2a078999
xf86SigioReadInput: closure=0x2a26a5f0 read_info=0x40526629
EvdevReadInput: pInfo=0x2a26a5f0
EvdevReadInput: pInfo=0x2a26a5f0 looptop
EvdevReadInput: post read len=32 (bufsize=256)
EvdevReadInput: <process 0
EvdevProcessEvent: Abs
EvPAbsME: value=454
EvPAbsME: (2) value=454
EvPAbsME: (3) value=454
EvPAbsME: (5) value=454
EvdevReadInput: >process 0
EvdevReadInput: <process 1
EvdevProcessEvent: Sync
EvPSyncE pEvdev=0x2a31b4b0 vals=0x2a31cec0
EvPSyncE (2) ArrayLength=32
EvPSyncE (3) pEvdev=0x2a31b4b0 vals=0x2a31cec0
EvdevReadInput: >process 1
xf86SIGIO exit for 29
Program received signal SIGSEGV, Segmentation fault.
0x00000020 in ?? ()
(gdb) where
#0 0x00000020 in ?? ()
#1 0x2a09b5f0 in xf86SIGIO (sig=707031856)
at ../../../../../hw/xfree86/os-support/linux/../shared/sigio.c:121
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb) q
Given that's in a signal handler perhaps the rest of the stack is fine;
it's just the return data that's had it.
--
-----Open up your eyes, open up your mind, open up your code -------
/ Dr. David Alan Gilbert | Running GNU/Linux | Happy \
\ gro.gilbert @ treblig.org | | In Hex /
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