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Date:      Thu, 9 Apr 2015 15:40:50 +0530
From:      Sibananda Sahu <sibananda.sahu@avagotech.com>
To:        freebsd-bugs@freebsd.org
Subject:   scsi_scan_bus in FreeBSD 10.1 has mutex unlock and lock swapped
Message-ID:  <2fa5e95f922badfba3ccf4dfd96e524e@mail.gmail.com>

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Hi,



Recently I was working with mpslsi3 driver and found that the system just
crashed at xpt_action() call.

The same driver code is working just fine with other versions of FreeBSD.



After digging a little into the CAM layer code I found that:

inside scsi_scan_bus()at line number: 1935 first mutex_unlock(mtx) is
called and then at line 1974 called mtx_lock(mtx) just before exiting the
XPT_SCAN_BUS case.



I just swapped the calls and called mutex_lock() first and then called
mutex_unlock() and found there is no kernel panic.

Driver was loaded just fine but after a while I was unable to operate the
system.

But pinging to the system was working and the system was up.



Is it OK or it looks to be a bug?





Thanks,

Sibananda Sahu



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