Re: Module unloading still broken on amd64?

[Paul Goyette <paul%whooppee.com@localhost>]

Hmmm, I rebooted the machine.  It dutifully took care of fsck'ing my 
root partition and rebooted itself.  During start-up it got a uvm fault:

uvm_fault(0xffff80004e77a008, 0x0, 2) -> e
kernel: page fault trap 0
Stopped in pid 339.1 (msater) at ffs:ufs_getattr+0x35: movq %rax,0x18(%rbx)

An attempt to get a backtrace fails:

ufs_getattr at ffs_ufs_getattr+0x35
?() at 0x8
Bad frame pointer: 0xffffffff80688fe0

I think I'll go back to my earlier kernel non-MODULAR kernel!  :)


On Wed, 31 Dec 2008, Paul Goyette wrote:

> With a kernel built from sources updated just a couple hours ago (13:40:07 
> UTC) I got the following panic:
>
> panic: kernel diagnostic assertion "me->flags & UVM_MAP_QUANTUM" failed: file 
> "/usr/src/sys/uvm/uvm_map.c", line 820
> fatal breakpoint trap in supervisor mode
> trap type 1 code 0 rip ffffffff80150af5 cs 8 rflags 246 cr2 7f7ffd958d30 cpl 
> 0 rsp ffff80004beef9c0
> stopped in pid 0.8 (system) at netbsd:breakpoint+0x5:  leave
>
> The backtrace looks like this (transcribed manually):
>
> breakpoint+0x5
> panic+0x24d
> __kernassert_0x2d
> uvm_mapent_allocsplit+0x107
> uvm_map_clip_start+0x2b
> uvm_unmap_remove+0x2f7
> uvm_unmap1+0x68
> kobj_unload+0x58
> module_do_unload+0x10f
> module_thread+0xe9
>
> This is a totally modular kernel, with NO built-in modules.
>
> This was actually the second crash I had (the first one happened while X was 
> running, so I didn't get the console info).  I had logged in on the console 
> and copied a file (approximately 5MB) from an nfs-mounted filesystem to a 
> local file, and logged out.  Some time later, I logged back in and tried to 
> cd to a directory on the nfs-mounted fs, and got the panic immediately - 
> before the shell-prompt came back.
>
> The system is totally wedged now, so I can't grab any more debug info from 
> this event.  Is there something useful that I can add to my 
> ddd.commandonenter for the next occurrence?
>
>
>
> -------------------------------------------------------------------------
> |   Paul Goyette   | PGP DSS Key fingerprint: |  E-mail addresses:      |
> | Customer Service | FA29 0E3B 35AF E8AE 6651 |  paul at whooppee.com   |
> | Network Engineer | 0786 F758 55DE 53BA 7731 | pgoyette at juniper.net |
> |                  |                          | pgoyette at netbsd.org  |
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|   Paul Goyette   | PGP DSS Key fingerprint: |  E-mail addresses:      |
| Customer Service | FA29 0E3B 35AF E8AE 6651 |  paul at whooppee.com   |
| Network Engineer | 0786 F758 55DE 53BA 7731 | pgoyette at juniper.net |
|                  |                          | pgoyette at netbsd.org  |
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