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

[Willem Jan Withagen]

This time with Dmesg....

> > > ----- 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
>
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