[RESOLVED] LOR On AMD64 hosted by KVM hypervisor

[Pete Wright]

Closing the loop on this for the archives - I am no longer seeing this
LOR as of r291998.

-pete

On 12/08/15 11:36, Pete Wright wrote:
> Hey All,
> I am seeing a repeated LOR on r291495 that is pretty reproducible.  This
> happens right after the system boots:
> 
> lock order reversal:
>  1st 0xfffffe03e37fa920 bufwait (bufwait) @ /usr/src/sys/kern/vfs_bio.c:3476
>  2nd 0xfffff80024c72200 dirhash (dirhash) @
> /usr/src/sys/ufs/ufs/ufs_dirhash.c:281
> stack backtrace:
> #0 0xffffffff80a7b2e0 at witness_debugger+0x70
> #1 0xffffffff80a7b1e1 at witness_checkorder+0xe71
> #2 0xffffffff80a28ab2 at _sx_xlock+0x72
> #3 0xffffffff80cc0a5d at ufsdirhash_add+0x3d
> #4 0xffffffff80cc390f at ufs_direnter+0x62f
> #5 0xffffffff80ccccd3 at ufs_makeinode+0x5f3
> #6 0xffffffff80cc881d at ufs_create+0x2d
> #7 0xffffffff80fb2ed1 at VOP_CREATE_APV+0xf1
> #8 0xffffffff80ae3568 at vn_open_cred+0x2f8
> #9 0xffffffff80adc8ec at kern_openat+0x25c
> #10 0xffffffff80e6a4fe at amd64_syscall+0x2de
> #11 0xffffffff80e4972b at Xfast_syscall+0xfb
> 
> Here is the system info:
> % uname -ar
> FreeBSD bsd-current.trp-srd.com 11.0-CURRENT FreeBSD 11.0-CURRENT #0
> r291495: Mon Nov 30 23:14:34 UTC 2015
> root at releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64
> 
> The server itself is a VM running under the KVM hypervisor.  I am
> currently rebuilding world+kernel now.  The base OS image is from the
> latest 11-CURRENT snapshot, and I have been able to reproduce this on
> several hypervisors.
> 
> Has anyone else seen this?
> 
> Cheers,
> -pete
> 
> 
> 
> 

-- 
Pete Wright
pete at nomadlogic.org
twitter => @nomadlogicLA