[Bug 226510] Panic in da_periph_acquire()

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226510

            Bug ID: 226510
           Summary: Panic in da_periph_acquire()
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: novel at FreeBSD.org

>From time to time on my desktop system running fairly fresh current I get a
panic with the following trace:

(kgdb) bt
#0  __curthread () at ./machine/pcpu.h:230
#1  doadump (textdump=0) at /usr/src/sys/kern/kern_shutdown.c:347
#2  0xffffffff8040a96b in db_dump (dummy=<optimized out>, dummy2=<unavailable>,
dummy3=<unavailable>, dummy4=<unavailable>) at
/usr/src/sys/ddb/db_command.c:574
#3  0xffffffff8040a739 in db_command (last_cmdp=<optimized out>,
cmd_table=<optimized out>, dopager=<optimized out>) at
/usr/src/sys/ddb/db_command.c:481
#4  0xffffffff8040a4b4 in db_command_loop () at
/usr/src/sys/ddb/db_command.c:534
#5  0xffffffff8040d6df in db_trap (type=<optimized out>, code=<optimized out>)
at /usr/src/sys/ddb/db_main.c:250
#6  0xffffffff80b18ff3 in kdb_trap (type=3, code=-61456, tf=<optimized out>) at
/usr/src/sys/kern/subr_kdb.c:697
#7  0xffffffff80f8b868 in trap (frame=0xfffffe005b975750) at
/usr/src/sys/amd64/amd64/trap.c:547
#8  <signal handler called>
#9  kdb_enter (why=0xffffffff811f9f80 "panic", msg=<optimized out>) at
/usr/src/sys/kern/subr_kdb.c:479
#10 0xffffffff80ad3dca in vpanic (fmt=<optimized out>, ap=0xfffffe005b9758c0)
at /usr/src/sys/kern/kern_shutdown.c:801
#11 0xffffffff80ad3e53 in panic (fmt=0xffffffff81be33f8 <cnputs_mtx>
"\266;\034\201\377\377\377\377") at /usr/src/sys/kern/kern_shutdown.c:739
#12 0xffffffff80369c57 in da_periph_acquire (periph=<optimized out>,
token=DA_REF_TUR) at /usr/src/sys/cam/scsi/scsi_da.c:1574
#13 damediapoll (arg=0xfffff80004bf2300) at
/usr/src/sys/cam/scsi/scsi_da.c:5668
#14 0xffffffff80aebd00 in softclock_call_cc (c=0xfffffe0069c15a68,
cc=0xffffffff81df2ac0 <cc_cpu>, direct=<optimized out>) at
/usr/src/sys/kern/kern_timeout.c:731
#15 0xffffffff80aec0cc in softclock (arg=0xffffffff81df2ac0 <cc_cpu>) at
/usr/src/sys/kern/kern_timeout.c:869
#16 0xffffffff80a96cc9 in intr_event_execute_handlers (p=<optimized out>,
ie=0xfffff80003826200) at /usr/src/sys/kern/kern_intr.c:1338
#17 0xffffffff80a973b7 in ithread_execute_handlers (ie=<optimized out>,
p=<optimized out>) at /usr/src/sys/kern/kern_intr.c:1351
#18 ithread_loop (arg=0xfffff8000382f120) at /usr/src/sys/kern/kern_intr.c:1432
#19 0xffffffff80a94104 in fork_exit (callout=0xffffffff80a97300 <ithread_loop>,
arg=0xfffff8000382f120, frame=0xfffffe005b975ac0) at
/usr/src/sys/kern/kern_fork.c:1039
#20 <signal handler called>
(kgdb)


Sources version:

Last Changed Rev: 330676
Last Changed Date: 2018-03-09 04:50:40 +0400 (Fri, 09 Mar 2018)

The only da(4) device I had when it paniced was:
da0 at umass-sim0 bus 0 scbus4 target 0 lun 0                                   
da0: <Multi Flash Reader 1.00> Removable Direct Access SCSI device              
da0: Serial Number 058F0O1111B1                                                 
da0: 40.000MB/s transfers                                                       
da0: Attempt to query device size failed: NOT READY, Medium not present         
da0: quirks=0x2<NO_6_BYTE>  

This is a flash card reader, and usually it stays connected, but without flash
cards attached to it. In other words, I didn't do anything with it to trigger a
panic.

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