https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200384
--- Comment #3 from Jimmy Olgeni <olg...@freebsd.org> ---
I managed to get a better backtrace (below).
A few more data points, always booting with the debug options enabled:
- Booting with ctld_enable -> panic
- Booting without ctld_enable, and then starting the ctld service -> panic
- Booting without ctld_enable, and kldloading ctl -> panic
- Booting without ctld_enable, and kldloading ctl after loading iscsi -> ok
- Booting with ctld_enable, but with iscsi_load and ctl_load in loader.conf ->
ok
There seems to be something going on between ctl and iscsi when
ctl is loaded without iscsi already present.
(kgdb) bt
#0 doadump (textdump=0) at pcpu.h:219
#1 0xffffffff803600fe in db_dump (dummy=<value optimized out>, dummy2=0,
dummy3=0, dummy4=0x0) at /usr/src/sys/ddb/db_command.c:533
#2 0xffffffff8035fb9d in db_command (cmd_table=0x0) at
/usr/src/sys/ddb/db_command.c:440
#3 0xffffffff8035f914 in db_command_loop () at
/usr/src/sys/ddb/db_command.c:493
#4 0xffffffff803622f0 in db_trap (type=<value optimized out>, code=0) at
/usr/src/sys/ddb/db_main.c:231
#5 0xffffffff809953d9 in kdb_trap (type=3, code=0, tf=<value optimized out>)
at /usr/src/sys/kern/subr_kdb.c:656
#6 0xffffffff80d8b73e in trap (frame=0xfffffe046a445210) at
/usr/src/sys/amd64/amd64/trap.c:554
#7 0xffffffff80d6fc52 in calltrap () at
/usr/src/sys/amd64/amd64/exception.S:236
#8 0xffffffff80994ae5 in kdb_break () at cpufunc.h:63
#9 0xffffffff80776d9b in scgetc (sc=0xffffffff8185be18, flags=<value optimized
out>) at /usr/src/sys/dev/syscons/syscons.c:3591
#10 0xffffffff807795ff in sc_cngetc (cd=0xffffffff81643f70) at
/usr/src/sys/dev/syscons/syscons.c:1782
#11 0xffffffff809071c5 in cngetc () at /usr/src/sys/kern/kern_cons.c:406
#12 0xffffffff8095a54e in kern_reboot (howto=260) at
/usr/src/sys/kern/kern_shutdown.c:455
#13 0xffffffff8095a9d5 in vpanic (fmt=<value optimized out>, ap=<value
optimized out>) at /usr/src/sys/kern/kern_shutdown.c:759
#14 0xffffffff8095aa23 in panic (fmt=0xffffffff81643f70 "\004") at
/usr/src/sys/kern/kern_shutdown.c:688
#15 0xffffffff80d8be3f in trap_fatal (frame=<value optimized out>, eva=<value
optimized out>) at /usr/src/sys/amd64/amd64/trap.c:857
#16 0xffffffff80d8ba98 in trap (frame=<value optimized out>) at
/usr/src/sys/amd64/amd64/trap.c:203
#17 0xffffffff80d6fc52 in calltrap () at
/usr/src/sys/amd64/amd64/exception.S:236
#18 0xffffffff802e494a in cam_periph_alloc (periph_ctor=0xffffffff802f9c30
<proberegister>,
periph_oninvalidate=<value optimized out>, periph_dtor=<value optimized
out>, periph_start=<value optimized out>,
name=<value optimized out>, type=<value optimized out>,
path=0xfffff80163591600, ac_callback=<value optimized out>,
code=<value optimized out>) at /usr/src/sys/cam/cam_periph.c:227
#19 0xffffffff802f94fb in scsi_scan_lun (request_ccb=<value optimized out>) at
/usr/src/sys/cam/scsi/scsi_xpt.c:2339
#20 0xffffffff802fd659 in scsi_scan_bus (periph=<value optimized out>,
request_ccb=0xfffff80163b33800)
at /usr/src/sys/cam/scsi/scsi_xpt.c:2037
#21 0xffffffff802f045b in xpt_scanner_thread (dummy=<value optimized out>) at
/usr/src/sys/cam/cam_xpt.c:2453
#22 0xffffffff809215d4 in fork_exit (callout=0xffffffff802f0350
<xpt_scanner_thread>, arg=0x0, frame=0xfffffe046a445c00)
at /usr/src/sys/kern/kern_fork.c:1017
#23 0xffffffff80d7018e in fork_trampoline () at
/usr/src/sys/amd64/amd64/exception.S:611
#24 0x0000000000000000 in ?? ()
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