[Bug 219857] panic in scsi_cd code

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219857

            Bug ID: 219857
           Summary: panic in scsi_cd code
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: avg at FreeBSD.org

The following panic happened right after cdrecord quit with an error while
writing to a CD-RW disk.

(cd0:ahcich10:0:0:0): READ(10). CDB: 28 00 00 00 00 00 00 00 01 00 
(cd0:ahcich10:0:0:0): CAM status: SCSI Status Error
(cd0:ahcich10:0:0:0): SCSI status: Check Condition
(cd0:ahcich10:0:0:0): SCSI sense: ILLEGAL REQUEST asc:21,0 (Logical block
address out of range)
(cd0:ahcich10:0:0:0): Error 22, Unretryable error
(cd0:ahcich10:0:0:0): cddone: got error 0x16 back

panic: sleepq_add: td 0xfffff800060bf000 to sleep on wchan 0xfffff801b3f1a048
with sleeping prohibited
cpuid = 4
time = 1496908339
KDB: stack backtrace:
db_trace_self_wrapper() at 0xffffffff80439f4b =
db_trace_self_wrapper+0x2b/frame 0xfffffe01ef5da770
kdb_backtrace() at 0xffffffff8068b369 = kdb_backtrace+0x39/frame
0xfffffe01ef5da820
vpanic() at 0xffffffff806521f2 = vpanic+0x162/frame 0xfffffe01ef5da860
panic() at 0xffffffff80651f23 = panic+0x43/frame 0xfffffe01ef5da8c0
sleepq_add() at 0xffffffff806979ff = sleepq_add+0x30f/frame 0xfffffe01ef5da910
_sleep() at 0xffffffff8065c0de = _sleep+0x2ae/frame 0xfffffe01ef5da9b0
cam_periph_ccbwait() at 0xffffffff802aac9d = cam_periph_ccbwait+0x5d/frame
0xfffffe01ef5da9e0
cam_periph_runccb() at 0xffffffff802aaac8 = cam_periph_runccb+0xb8/frame
0xfffffe01ef5daa40
cdrunccb() at 0xffffffff802cab8c = cdrunccb+0x3c/frame 0xfffffe01ef5daa60
cdprevent() at 0xffffffff802ca48b = cdprevent+0x7b/frame 0xfffffe01ef5daaa0
cdcheckmedia() at 0xffffffff802ca132 = cdcheckmedia+0x22/frame
0xfffffe01ef5daaf0
cdstrategy() at 0xffffffff802c8356 = cdstrategy+0x56/frame 0xfffffe01ef5dab20
g_disk_start() at 0xffffffff805c38f0 = g_disk_start+0x180/frame
0xfffffe01ef5dab70
g_io_schedule_down() at 0xffffffff805c760b = g_io_schedule_down+0x1eb/frame
0xfffffe01ef5dab90
g_down_procbody() at 0xffffffff805c7fed = g_down_procbody+0x6d/frame
0xfffffe01ef5daba0
fork_exit() at 0xffffffff80618680 = fork_exit+0xd0/frame 0xfffffe01ef5dabf0
fork_trampoline() at 0xffffffff8084304e = fork_trampoline+0xe/frame
0xfffffe01ef5dabf0

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