| Re: [9fans] tip 9vx segfault on Ubuntu in Xen |
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Group: comp.os.plan9 · Group Profile
Author: Tom LieberTom Lieber Date: Jul 1, 2008 07:05
On Tue, Jul 1, 2008 at 9:00 AM, Russ Cox swtch.com> wrote:>> I have Ubuntu on a VPS (on Xen) and I'd like to install a Plan 9
>> server using 9vx. 9vx tip compiles, but segfaults after the "256M
>> memory" line (as does the precompiled binary, in the same place). I am
>> tunneling to local X11 on OS X 10.5.3.
>>
>> I don't know how to debug this properly, but here is gdb output
>> similar to what I saw in another report. >
> The seg faults are normal. 9vx handles them and continues.
> To run under gdb you need to say
>
> handle SIGSEGV noprint nostop
>
> so that gdb will let it keep going.
>
> What behavior did you see when you weren't running under gdb?
> If it was a panic, better to set a break point at panic.
No panic: the window appears and two lines print (the command-line
arguments and the memory readout), then everything stops. When I use
-X, the lines of assembly stop.
This looks useless, but if I pause in gdb the backtrace is:
#0 0xffffe410 in __kernel_vsyscall ()
#1 0x401f6647 in poll () from /lib/tls/i686/cmov/libc.so.6
#2 0x40061839 in ?? () from /usr/lib/libX11.so.6
#3 0x08272970 in ?? ()
#4 0x00000001 in ?? ()
#5 0xffffffff in ?? ()
#6 0x40111b2c in ?? () from /usr/lib/libX11.so.6
#7 0x082723c0 in ?? ()
#8 0x40111b2c in ?? () from /usr/lib/libX11.so.6
#9 0x082723c0 in ?? ()
#10 0x00000000 in ?? ()
If I press keys, though, I get output like this, so I guess it's not
completely frozen:
memdraw 827b780 [4 57] [13 68] 8269da8 [1879113727 -613566757] 8269e60 [918 2]
memdraw 827b780 [13 57] [22 68] 8269da8 [1879113727 -613566757] 8269e60 [918 2]
memdraw 827b780 [22 60] [31 68] 8269da8 [1879113727 -613566757] 8269e60 [873 5]
It never does anything as long as I wait, though.
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