Date: Thu, 12 Nov 2015 09:44:52 -0800 From: Pete Wright <pete@nomadlogic.org> To: current@freebsd.org Subject: LOR in mpr(4) Message-ID: <5644D014.4080601@nomadlogic.org>
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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> I can file a PR for this as a quick search on my end didn't return any bugs related to this. Checking here first to make sure this isn't already known/expected behavior. Thanks! -pete -- Pete Wright pete@nomadlogic.org twitter => @nomadlogicLA
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