Not able to make coredumps... (Was: Re: Panic at line 602 in file ffs_vnops.c)

[Willem Jan Withagen]

> > ----- Original Message ----- 
> > From: "Willem Jan Withagen" <wjw at withagen.nl>
> >
> > > In an attempt to port some compiler tools, I'm testing its memory
allocator.
> > > And that does not really work, it is a shure way to crash my dual opteron.
> > >
> > > panic: ffs_write: uio -> uio_resid < 0
> > > at line 602 in file /home2/src/sys/ufs/ffs/ffs_vnop.c
> > >
> > > If I then type 'cont' I'd exepct to get coredump.
> > > But it just gives up on 708 buffers, prints the uptime
> > > and sits quitely in a corner until I hard-reset it.
> > > No other keys will get it back....
> > >
> > > Before it crashes I first get the inocent LOR on ....swap...:1313
> > > The program usually get an invalid pointer allocated with calloc.
> > > And as far as I can tell, then crashes on free-ing with this pointer.
> > >
> > > Any takers on this??
> > > Looks to me there are 2 problems:
> > >     I'm able to upset allocator with this program.
> > >         (If I write the same program, in shorthand, it stays alive)
> > >     The system does not want to dump/reboot
> >
> > To follow up on myself:
> >
> > 'where' after the crash gives: (copied via paper)
> > ffs_write()   at ... +0x64e
> > vn_rdwr()     at ... +0xf1
> > vn_rdwr_inchuncks()    at ... +0x77
> > elf64_coredump()       at ... +0x1222
> > coredump()    at ... +0x5da
> > sigexit()     at ... +0x71
> > postsig()     at ... +0x30e
> > ast()         at ... +0x297
> > Xfas_syscall()         at ... +0xdd
> >
> > ------ syscall(0, FreeBSD ELF64, nosys)
> >     rip = 0x20067b8ec
> >     rsp = 0x7fffffffe678
> >     rbp = 0x2006de6c0
> >
> > So it looks like the systems want to write a dump, but does not really get
> > to write it....
>
> And even more follow up:
> I tried to just get a coredump by going crtl-alt-esc and go 'panic' in ddb.
> But ended up with a freeze and:
>
> pmap_invalidate_range: interrupts disabled
> at line 664 inf file /home2/src/sys/amd64/amd64/pmap.ccpuid=1
>
> Where I think the last line should read:
>     pmap.c cpuid=1
>
> I think I need this fixed before I can start looking at the other problem??

To continue this saga, I can reproduce this on i386 as well....
Completely the same effect.
Dmesg included. The amd64 version was of sunday late.
The i386 version is still somewhat older.

> >
> > What more can I do??

--WjW