Date: Tue, 17 Nov 2015 12:43:42 -0800 From: Pete Wright <pete@nomadlogic.org> To: current@freebsd.org Subject: Re: LOR in mpr(4) Message-ID: <564B917E.4000205@nomadlogic.org> In-Reply-To: <5644D014.4080601@nomadlogic.org> References: <5644D014.4080601@nomadlogic.org>
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On 11/12/15 09:44, Pete Wright wrote: > Hi All, > Just wanted a sanity check before filing a PR. I am running r290688 and > am seeing a LOR being triggered in the mpr(4) device: > > $ uname -ar > FreeBSD srd0013 11.0-CURRENT FreeBSD 11.0-CURRENT #1 r290688: Wed Nov 11 > 21:28:26 PST 2015 root@srd0013:/usr/obj/usr/src/sys/GENERIC amd64 > > <dmesg snip> > lock order reversal: > 1st 0xfffff8000d26bc60 CAM device lock (CAM device lock) @ > /usr/src/sys/cam/cam_xpt.c:784 > 2nd 0xfffffe00012811c0 MPR lock (MPR lock) @ > /usr/src/sys/cam/cam_xpt.c:2620 > KDB: stack backtrace: > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame > 0xfffffe04608ee890 > witness_checkorder() at witness_checkorder+0xe79/frame 0xfffffe04608ee910 > __mtx_lock_flags() at __mtx_lock_flags+0xa4/frame 0xfffffe04608ee960 > xpt_action_default() at xpt_action_default+0xb6c/frame 0xfffffe04608ee9b0 > scsi_scan_bus() at scsi_scan_bus+0x1d5/frame 0xfffffe04608eea20 > xpt_scanner_thread() at xpt_scanner_thread+0x15c/frame 0xfffffe04608eea70 > fork_exit() at fork_exit+0x84/frame 0xfffffe04608eeab0 > fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe04608eeab0 > --- trap 0, rip = 0, rsp = 0, rbp = 0 --- > <snip> FWIW I filed the following PR as I can still reproduce this on boot: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204614 cheers, -pete -- Pete Wright pete@nomadlogic.org twitter => @nomadlogicLA
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