[uml-devel] handle_trap - failed to wait at end of syscall [was Re: [uml-devel] debugging UML cores]

["Joe Marzot" <gmarzot@nortelnetworks.com>]

Joe Marzot wrote:

> here is a better one produced under similar conditions - this time the 
> core is readable (I do get the unreadable cores quite often though).
> 
> this is host RH8 + skas3 patch
> 
> guest is 2.4.2x + 2.4.24-1um

so looking deeper in this core in handle_trap I see the call to waitpid 
fails with a status of 383 and an err of 13456

(gdb) p err
$6 = 13456 (the pid of the child who exitted)
(gdb) p status
$7 = 383

WSTOPSIG(err) = SIGHUP

does this give any clues...any ideas of what else to look at?

thanks, GSM

> 
> [root@wbl6y227 plankton]# /usr/local/builds/gdb-6.2/gdb/gdb -c 
> ~szhimin/tmp/joe/core.13456 
> /view/build_neptune_dev_int144.resp3/vob/neptune/plankton/celp/linux.celp
> GNU gdb 6.2
> Copyright 2004 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you 
> are
> welcome to change it and/or distribute copies of it under certain 
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "i686-pc-linux-gnu"...Using host libthread_db 
> library "/lib/libthread_db.so.1".
> 
> Core was generated by `/vob/neptune/plankton/celp/linux.celp (DSC-0-0-0) 
> [nameServer]                '.
> Program terminated with signal 6, Aborted.
> #0  0xa01643e1 in kill ()
>     at 
> /localdisk/builds/3pc/2.4.22-i686sim/2.4.22/include/asm/arch/string.h:486
> 486                     case 1: COMMON("\n\tstosb"); return s;
> (gdb) where
> #0  0xa01643e1 in kill ()
>     at 
> /localdisk/builds/3pc/2.4.22-i686sim/2.4.22/include/asm/arch/string.h:486
> #1  0xa018cbdb in raise ()
>     at 
> /localdisk/builds/3pc/2.4.22-i686sim/2.4.22/include/asm/arch/string.h:486
> #2  0xa01646cd in abort ()
>     at 
> /localdisk/builds/3pc/2.4.22-i686sim/2.4.22/include/asm/arch/string.h:486
> #3  0xa00d01e4 in handle_trap (pid=13461, regs=0xa5f7827c) at process.c:90
> #4  0xa00d0438 in userspace (regs=0xa5f7827c) at process.c:168
> #5  0xa00d0bfa in fork_handler (sig=10) at process_kern.c:102
> #6  <signal handler called>
> #7  0xa01643e1 in kill ()
>     at 
> /localdisk/builds/3pc/2.4.22-i686sim/2.4.22/include/asm/arch/string.h:486
> #8  0xa00d4734 in os_usr1_process (pid=13456) at process.c:95
> #9  0xa00d04ce in new_thread (stack=Cannot access memory at address 0x8
> ) at process.c:205
> Previous frame inner to this frame (corrupt stack?)
> (gdb) info thr
> * 1 process 13456  0xa01643e1 in kill ()
>     at 
> /localdisk/builds/3pc/2.4.22-i686sim/2.4.22/include/asm/arch/string.h:486
> (gdb)
> 
> 
> 





-------------------------------------------------------
SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media
100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33
Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift.
http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285
_______________________________________________
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel