Date: Tue, 8 Dec 2015 11:36:09 -0800 From: Pete Wright <pete@nomadlogic.org> To: current@freebsd.org Subject: LOR On AMD64 hosted by KVM hypervisor Message-ID: <56673129.4090207@nomadlogic.org>
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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@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@nomadlogic.org twitter => @nomadlogicLA
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