[Bug 230510] iflib/vlan panic: sleeping thread

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230510

            Bug ID: 230510
           Summary: iflib/vlan panic: sleeping thread
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: bugzilla.freebsd at omnilan.de

If I utilize rc.network(8) to create a vlan(4) child of a iflib em0(4) parent
device, I get really a lot of LOR's (most likely all LOR's too fast to read). 
Estimated 500-2000 LOR's before panic.

Here's the backtrace:
#1  0xffffffff803ecb2b in db_dump (dummy=<value optimized out>, dummy2=<value
optimized out>, dummy3=<value optimized out>, 
    dummy4=<value optimized out>) at
/usr/local/share/deploy-tools/HEAD/src/sys/ddb/db_command.c:574
#2  0xffffffff803ec8f9 in db_command (cmd_table=<value optimized out>)
    at /usr/local/share/deploy-tools/HEAD/src/sys/ddb/db_command.c:481
#3  0xffffffff803ec674 in db_command_loop () at
/usr/local/share/deploy-tools/HEAD/src/sys/ddb/db_command.c:534
#4  0xffffffff803ef8ff in db_trap (type=<value optimized out>, code=<value
optimized out>)
    at /usr/local/share/deploy-tools/HEAD/src/sys/ddb/db_main.c:252
#5  0xffffffff80834923 in kdb_trap (type=3, code=0, tf=<value optimized out>)
    at /usr/local/share/deploy-tools/HEAD/src/sys/kern/subr_kdb.c:693
#6  0xffffffff80b4a3ef in trap (frame=0xfffffe00751e8560) at
/usr/local/share/deploy-tools/HEAD/src/sys/amd64/amd64/trap.c:605
#7  0xffffffff80b25d95 in calltrap () at
/usr/local/share/deploy-tools/HEAD/src/sys/amd64/amd64/exception.S:232
#8  0xffffffff80833ffb in kdb_enter (why=0xffffffff80ca81cc "panic", msg=<value
optimized out>) at cpufunc.h:65
#9  0xffffffff807e9c00 in vpanic (fmt=<value optimized out>,
ap=0xfffffe00751e86d0)
    at /usr/local/share/deploy-tools/HEAD/src/sys/kern/kern_shutdown.c:852
#10 0xffffffff807e9c93 in panic (fmt=<value optimized out>)
    at /usr/local/share/deploy-tools/HEAD/src/sys/kern/kern_shutdown.c:790
#11 0xffffffff8084bab5 in propagate_priority (td=<value optimized out>)
    at /usr/local/share/deploy-tools/HEAD/src/sys/kern/subr_turnstile.c:228
#12 0xffffffff8084c56d in turnstile_wait (ts=0xfffff80003089e40,
owner=0xfffff800035da580, queue=<value optimized out>)
    at /usr/local/share/deploy-tools/HEAD/src/sys/kern/subr_turnstile.c:783
#13 0xffffffff807c7cf1 in __mtx_lock_sleep (c=0xfffff80003636ee0, v=<value
optimized out>, opts=<value optimized out>, 
    file=<value optimized out>, line=<value optimized out>) at
/usr/local/share/deploy-tools/HEAD/src/sys/kern/kern_mutex.c:639
#14 0xffffffff807c7a79 in __mtx_lock_flags (c=0xfffff80003636ee0, opts=<value
optimized out>, file=<value optimized out>, 
    line=<value optimized out>) at
/usr/local/share/deploy-tools/HEAD/src/sys/kern/kern_mutex.c:255
#15 0xffffffff807e3725 in _rm_wlock (rm=0xfffff80003636e88) at
/usr/local/share/deploy-tools/HEAD/src/sys/kern/kern_rmlock.c:540
#16 0xffffffff807e3a94 in _rm_wlock_debug (rm=0xfffff80003636e88, 
    file=0xffffffff80cb26fe
"/usr/local/share/deploy-tools/HEAD/src/sys/net/if_vlan.c", line=1639)
    at /usr/local/share/deploy-tools/HEAD/src/sys/kern/kern_rmlock.c:605
#17 0xffffffff80904f9b in vlan_link_state (ifp=0xfffff80003ba3000)
    at /usr/local/share/deploy-tools/HEAD/src/sys/net/if_vlan.c:1639
#18 0xffffffff808efd90 in do_link_state_change (arg=0xfffff80003ba3000,
pending=1)
    at /usr/local/share/deploy-tools/HEAD/src/sys/net/if.c:2332
#19 0xffffffff808484bc in taskqueue_run_locked (queue=0xfffff800030b3500)
    at /usr/local/share/deploy-tools/HEAD/src/sys/kern/subr_taskqueue.c:465
#20 0xffffffff8084832a in taskqueue_run (queue=0xfffff800030b3500)
    at /usr/local/share/deploy-tools/HEAD/src/sys/kern/subr_taskqueue.c:484
#21 0xffffffff807ab180 in ithread_loop (arg=<value optimized out>)
    at /usr/local/share/deploy-tools/HEAD/src/sys/kern/kern_intr.c:1043
#22 0xffffffff807a8004 in fork_exit (callout=0xffffffff807ab040 <ithread_loop>,
arg=0xfffff8000359e080, frame=0xfffffe00751e8ac0)
---Type <return> to continue, or q <return> to quit---
    at /usr/local/share/deploy-tools/HEAD/src/sys/kern/kern_fork.c:1057
#23 0xffffffff80b26d6e in fork_trampoline () at
/usr/local/share/deploy-tools/HEAD/src/sys/amd64/amd64/exception.S:990
#24 0x0000000000000000 in ?? ()

Unfortunately I don't have the source easily accessabele on that system and
also no easy way to capture console output.
Please tell me if additional info is a prerequisite to analyze the problem,
I'll provide the missing parts.

Thanks,
-harry

P.S.: If I manually create the vlan(4) child from multi user shell, there are
LOR's but _no_ panic happening. Also, the vlan(4) device works afterwards.

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