https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226578

            Bug ID: 226578
           Summary: panic: _mtx_lock_sleep: recursed on non-recursive
                    mutex CAM device lock @
                    /usr/home/trasz/svn-ssh/head/sys/cam/scsi/scsi_da.c:20
                    42
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: tr...@freebsd.org

The current -CURRENT panics like this:

Unread portion of the kernel message buffer:
WARNING: 127.0.0.1 (iqn.2012-06.com.example:target0): connection error;
reconnecting
panic: _mtx_lock_sleep: recursed on non-recursive mutex CAM device lock @
/usr/home/trasz/svn-ssh/head/sys/cam/scsi/scsi_da.c:2042

cpuid = 3
time = 1520959743
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00265b85e0
vpanic() at vpanic+0x18d/frame 0xfffffe00265b8640
vpanic() at vpanic/frame 0xfffffe00265b86c0
__mtx_lock_sleep() at __mtx_lock_sleep+0x420/frame 0xfffffe00265b8750
__mtx_lock_flags() at __mtx_lock_flags+0xf9/frame 0xfffffe00265b87a0
daasync() at daasync+0x117/frame 0xfffffe00265b87f0
xpt_async_process_dev() at xpt_async_process_dev+0x162/frame 0xfffffe00265b8840
xptdevicetraverse() at xptdevicetraverse+0xa4/frame 0xfffffe00265b8890
xpttargettraverse() at xpttargettraverse+0x6b/frame 0xfffffe00265b88d0
xpt_async_process() at xpt_async_process+0x114/frame 0xfffffe00265b89e0
xpt_done_process() at xpt_done_process+0x390/frame 0xfffffe00265b8a20
xpt_done_td() at xpt_done_td+0xf6/frame 0xfffffe00265b8a70
fork_exit() at fork_exit+0x84/frame 0xfffffe00265b8ab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00265b8ab0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic

__curthread () at ./machine/pcpu.h:230
230             __asm("movq %%gs:%1,%0" : "=r" (td)
(kgdb) #0  __curthread () at ./machine/pcpu.h:230
#1  doadump (textdump=0)
    at /usr/home/trasz/svn-ssh/head/sys/kern/kern_shutdown.c:347
#2  0xffffffff8040acfb in db_dump (dummy=<optimized out>, 
    dummy2=<unavailable>, dummy3=<unavailable>, dummy4=<unavailable>)
    at /usr/home/trasz/svn-ssh/head/sys/ddb/db_command.c:574
#3  0xffffffff8040aac9 in db_command (last_cmdp=<optimized out>, 
    cmd_table=<optimized out>, dopager=<optimized out>)
    at /usr/home/trasz/svn-ssh/head/sys/ddb/db_command.c:481
#4  0xffffffff8040a844 in db_command_loop ()
    at /usr/home/trasz/svn-ssh/head/sys/ddb/db_command.c:534
#5  0xffffffff8040da6f in db_trap (type=<optimized out>, code=<optimized out>)
    at /usr/home/trasz/svn-ssh/head/sys/ddb/db_main.c:250
#6  0xffffffff80b192d3 in kdb_trap (type=3, code=-61456, tf=<optimized out>)
    at /usr/home/trasz/svn-ssh/head/sys/kern/subr_kdb.c:697
#7  0xffffffff80f8b868 in trap (frame=0xfffffe00265b8510)
    at /usr/home/trasz/svn-ssh/head/sys/amd64/amd64/trap.c:547
#8  <signal handler called>
#9  kdb_enter (why=0xffffffff811fcef3 "panic", msg=<optimized out>)
    at /usr/home/trasz/svn-ssh/head/sys/kern/subr_kdb.c:479
#10 0xffffffff80ad409a in vpanic (fmt=<optimized out>, ap=0xfffffe00265b8680)
    at /usr/home/trasz/svn-ssh/head/sys/kern/kern_shutdown.c:801
#11 0xffffffff80ad3ef0 in kassert_panic (
    fmt=0xffffffff81146b66 "_mtx_lock_sleep: recursed on non-recursive mutex %s
@ %s:%d\n") at /usr/home/trasz/svn-ssh/head/sys/kern/kern_shutdown.c:698
#12 0xffffffff80ab3400 in __mtx_lock_sleep (c=0xfffff800054134e8, 
    v=18446735277674057728, opts=<optimized out>, file=<optimized out>, 
    line=32) at /usr/home/trasz/svn-ssh/head/sys/kern/kern_mutex.c:509
#13 0xffffffff80ab2f49 in __mtx_lock_flags (c=0xfffff800054134e8, 
    opts=<optimized out>, file=<optimized out>, line=<optimized out>)
    at /usr/home/trasz/svn-ssh/head/sys/kern/kern_mutex.c:255
#14 0xffffffff80366cf7 in daasync (callback_arg=0xfffff80005c76200, 
    code=16384, path=<optimized out>, arg=0xfffff800037f2800)
    at /usr/home/trasz/svn-ssh/head/sys/cam/scsi/scsi_da.c:2042
#15 0xffffffff80342462 in xpt_async_bcast (async_head=<optimized out>, 
    async_code=<optimized out>, path=<optimized out>, 
    async_arg=0xfffff800037f2800)
    at /usr/home/trasz/svn-ssh/head/sys/cam/cam_xpt.c:4408
#16 xpt_async_process_dev (device=<optimized out>, arg=<optimized out>)
    at /usr/home/trasz/svn-ssh/head/sys/cam/cam_xpt.c:4315
#17 0xffffffff80341304 in xptdevicetraverse (target=0xfffff80005961300, 
    start_device=<optimized out>, tr_func=0xfffff80005a89000, 
    arg=<optimized out>)
    at /usr/home/trasz/svn-ssh/head/sys/cam/cam_xpt.c:2339
#18 0xffffffff8034108b in xpttargettraverse (bus=0xfffff80005a05300, 
    start_target=<optimized out>, 
    tr_func=0xffffffff803422a0 <xpt_async_process_tgt>, 
    arg=0xfffff80005a89000)
    at /usr/home/trasz/svn-ssh/head/sys/cam/cam_xpt.c:2300
#19 0xffffffff8033dd44 in xpt_async_process (periph=<optimized out>, 
    ccb=0xfffff80005a89000)
    at /usr/home/trasz/svn-ssh/head/sys/cam/cam_xpt.c:4364
#20 0xffffffff8033e700 in xpt_done_process (ccb_h=0xfffff80005a89000)
    at /usr/home/trasz/svn-ssh/head/sys/cam/cam_xpt.c:5495
#21 0xffffffff80340786 in xpt_done_td (arg=0xffffffff81995000 <cam_doneqs>)
    at /usr/home/trasz/svn-ssh/head/sys/cam/cam_xpt.c:5522
#22 0xffffffff80a943d4 in fork_exit (
    callout=0xffffffff80340690 <xpt_done_td>, 
    arg=0xffffffff81995000 <cam_doneqs>, frame=0xfffffe00265b8ac0)
    at /usr/home/trasz/svn-ssh/head/sys/kern/kern_fork.c:1039
#23 <signal handler called>
(kgdb) 

The way to reproduce it is to set up an iSCSI session, disconnect it in a loop
("while :; do ctladm isterminate -a; sleep 1; done"), while having "while :; do
diskinfo -t /dev/da0; done" running in another session.

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