Date: Mon, 16 Nov 2015 23:38:54 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 204614] LOR In mpr(4) Message-ID: <bug-204614-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204614 Bug ID: 204614 Summary: LOR In mpr(4) Product: Base System Version: 11.0-CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: pete@nomadlogic.org I am seeing the following LOR on 11.0-CURRENT: lock order reversal: 1st 0xfffff8000d26bc60 CAM device lock (CAM device lock) @ /usr/src/sys/cam/cam_xpt.c:784 2nd 0xfffffe00012911c0 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 0xfffffe04608ec890 witness_checkorder() at witness_checkorder+0xe79/frame 0xfffffe04608ec910 __mtx_lock_flags() at __mtx_lock_flags+0xa4/frame 0xfffffe04608ec960 xpt_action_default() at xpt_action_default+0xb6c/frame 0xfffffe04608ec9b0 scsi_scan_bus() at scsi_scan_bus+0x1d5/frame 0xfffffe04608eca20 xpt_scanner_thread() at xpt_scanner_thread+0x15c/frame 0xfffffe04608eca70 fork_exit() at fork_exit+0x84/frame 0xfffffe04608ecab0 fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe04608ecab0 --- trap 0, rip = 0, rsp = 0, rbp = 0 --- Here is my system info: [pwright@srd0013 ~]$ uname -ar FreeBSD srd0013 11.0-CURRENT FreeBSD 11.0-CURRENT #2 r290942: Mon Nov 16 12:01:20 PST 2015 root@srd0013:/usr/obj/usr/src/sys/GENERIC amd64 [pwright@srd0013 ~]$ cd /usr/src/ && svn info Path: . Working Copy Root Path: /usr/src URL: https://svn.freebsd.org/base/head Relative URL: ^/head Repository Root: https://svn.freebsd.org/base Repository UUID: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f Revision: 290942 Node Kind: directory Schedule: normal Last Changed Author: rodrigc Last Changed Rev: 290942 Last Changed Date: 2015-11-16 09:28:04 -0800 (Mon, 16 Nov 2015) I have rebuild kernel+world several times over the past week and can reproduce this. -- You are receiving this mail because: You are the assignee for the bug.
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