On Wed, 28 Sep 2005, Rob Watt wrote:
We re-compiled the kernel with 'options KDB_STOP_NMI', and were able to
get a much more full analysis of what was happening on the 6-BETA5
crash.
Great.
We crashed in top again, and it does look like we may have hit a
kern_proc bug.
This sounds good, or at least, promising.
in the attached file type3-core.txt you can see that it hits an
exception in:
0xffffffff802b897a is in fill_kinfo_thread
(/usr/src/sys/kern/kern_proc.c:736).
731 }
732
733 kg = td->td_ksegrp;
734
735 /* things in the KSE GROUP */
736 kp->ki_estcpu = kg->kg_estcpu;
737 kp->ki_slptime = kg->kg_slptime;
738 kp->ki_pri.pri_user = kg->kg_user_pri;
739 kp->ki_pri.pri_class = kg->kg_pri_class;
740
(kgdb) frame 8
#8 0xffffffff802b897a in fill_kinfo_thread (td=0xffffff0063311260,
kp=0xffffffffb62d8510)
at /usr/src/sys/kern/kern_proc.c:733
733 kg = td->td_ksegrp;
(kgdb) p kg->kg_estcpu
Cannot access memory at address 0x173
(kgdb) p td->td_ksegrp
$1 = (struct ksegrp *) 0x0
(kgdb) p kp->ki_estcpu
$2 = 0
(kgdb) p kg
$4 = (struct ksegrp *) 0x12b
it seems that kg is an invalid pointer.
Could you dump the contents of *td and *td->td_proc for me? I'm quite
interested to know what the value in td->td_proc->p_state is, among other
things. If I could also have you generate a dump of the KSE group
structures in td->td_proc->p_ksegrps and the threads in
td->td_proc->p_threads.
Could you tell me if the program named by p->p_comm is linked against a
threading library? If it's a custom app, you may already know, and if
not, you can run ldd on the application to see what it is linked against.
Depending on how much time you have available, it might make sense for me
to grab from you a copy of your source tree, compiled kernel with debug
symbols, and core dump.
We have started our tests again without running top.
Hope you have a great vacation.
It was brief but very enjoyable, and quite disconnected :-).
Thanks,
Robert
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