[Bug 204614] LOR In mpr(4)

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204614

Sean Bruno <sbruno at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |asomers at FreeBSD.org,
                   |                            |clusteradm at FreeBSD.org,
                   |                            |freebsd-scsi at FreeBSD.org,
                   |                            |ken at FreeBSD.org,
                   |                            |sbruno at FreeBSD.org,
                   |                            |scottl at FreeBSD.org,
                   |                            |slm at freebsd.org

--- Comment #2 from Sean Bruno <sbruno at FreeBSD.org> ---
We just ran into this in the FreeBSD cluster with:
FreeBSD 11.0-CURRENT #0 r296318M: Mon Apr  4 21:46:27 UTC 2016


mpr0: SAS Address for SATA device = 2a4f636b92648265
mpr0: SAS Address for SATA device = 142f4f6e92648266
mpr0: SAS Address for SATA device = b2a706e92648266
mpr0: SAS Address for SATA device = 4414c6e92648266
mpr0: SAS Address from SAS device page0 = 500304801ecc0b00
mpr0: SAS Address from SATA device = 2a4f636b92648265
mpr0: Found device <81<SataDev>,End Device> <12.0Gbps> handle<0x000a>
enclosureHandle<0x0002> slot 0
mpr0: At enclosure level 0 and connector name (    )
lock order reversal:
 1st 0xfffff8013d2c7460 CAM device lock (CAM device lock) @
/usr/src/sys/cam/cam_xpt.c:784
 2nd 0xfffffe0001b331c0 MPR lock (MPR lock) @ /usr/src/sys/cam/cam_xpt.c:2622
stack backtrace:
#0 0xffffffff80a83000 at witness_debugger+0x70
#1 0xffffffff80a82f01 at witness_checkorder+0xe71
#2 0xffffffff80a09d24 at __mtx_lock_flags+0xa4
#3 0xffffffff803022cc at xpt_action_default+0xb6c
#4 0xffffffff803120e5 at scsi_scan_bus+0x1d5
#5 0xffffffff80307f3c at xpt_scanner_thread+0x15c
#6 0xffffffff809ebea4 at fork_exit+0x84
#7 0xffffffff80e59f1e at fork_trampoline+0xe
mpr0: SAS Address from SAS device page0 = 500304801ecc0b01
mpr0: SAS Address from SATA device = 142f4f6e92648266
mpr0: Found device <81<SataDev>,End Device> <12.0Gbps> handle<0x000b>
enclosureHandle<0x0002> slot 1
mpr0: At enclosure level 0 and connector name (    )
mpr0: SAS Address from SAS device page0 = 500304801ecc0b02
mpr0: SAS Address from SATA device = b2a706e92648266
mpr0: Found device <81<SataDev>,End Device> <12.0Gbps> handle<0x000c>
enclosureHandle<0x0002> slot 2
mpr0: At enclosure level 0 and connector name (    )
mpr0: SAS Address from SAS device page0 = 500304801ecc0b03
mpr0: SAS Address from SATA device = 4414c6e92648266
mpr0: Found device <81<SataDev>,End Device> <12.0Gbps> handle<0x000d>
enclosureHandle<0x0002> slot 3

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