[Bug 217413] panic: Assertion err == 0 failed at /usr/src/sys/net/iflib.c:2242 after attaching the cable with 1000m fixed speed at another end

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217413

--- Comment #1 from bsd at kobyla.org ---

System was updated to the fresh HEAD.
For testing purposes 2 ports were set to ifconfig down (media: Ethernet
autoselect) and directly connected by a patch-cord:

kernel: bce2: Gigabit link up!
kernel: bce2: link state changed to UP
kernel: bce3: Gigabit link up!
kernel: bce3: link state changed to UP

No problem yet.
Immediately after patch-cord disconnection links state change and server
panics.
So link disconnection also brings the same problem:

kernel: bce2: link state changed to DOWN
kernel: bce3: link state changed to DOWN


Dump header from device: /dev/mfid0p20
  Architecture: amd64
  Architecture Version: 2
  Dump Length: 2216656896
  Blocksize: 512
  Dumptime: Tue Feb 28 13:28:00 2017
  Hostname: dell1.home
  Magic: FreeBSD Kernel Dump
  Version String: FreeBSD 12.0-CURRENT #0 r314382M: Tue Feb 28 13:03:43 UTC
2017
    root at dell1.home:/usr/obj/usr/src/sys/PDC10
  Panic String: Assertion err == 0 failed at /usr/src/sys/net/iflib.c:2242
  Dump Parity: 2816930518
  Bounds: 6
  Dump Status: good

 #0  doadump (textdump=0) at pcpu.h:232
 232     pcpu.h: No such file or directory.
         in pcpu.h
 (kgdb) #0  doadump (textdump=0) at pcpu.h:232
 #1  0xffffffff8031d0fc in db_fncall (dummy1=<value optimized out>, 
     dummy2=<value optimized out>, dummy3=<value optimized out>, 
     dummy4=<value optimized out>) at /usr/src/sys/ddb/db_command.c:581
 #2  0xffffffff8031cc7f in db_command (cmd_table=<value optimized out>)
     at /usr/src/sys/ddb/db_command.c:453
 #3  0xffffffff80321648 in db_script_exec (scriptname=<value optimized out>, 
     warnifnotfound=<value optimized out>) at /usr/src/sys/ddb/db_script.c:302
 #4  0xffffffff80321493 in db_script_kdbenter (eventname=<value optimized out>)
     at /usr/src/sys/ddb/db_script.c:324
 #5  0xffffffff8031f9aa in db_trap (type=<value optimized out>, 
     code=<value optimized out>) at /usr/src/sys/ddb/db_main.c:247
 #6  0xffffffff80583983 in kdb_trap (type=<value optimized out>, 
     code=<value optimized out>, tf=<value optimized out>)
     at /usr/src/sys/kern/subr_kdb.c:654
 #7  0xffffffff8082b601 in trap (frame=0xfffffe044117f890)
     at /usr/src/sys/amd64/amd64/trap.c:537
 #8  0xffffffff8080dca1 in calltrap ()
     at /usr/src/sys/amd64/amd64/exception.S:236
 #9  0xffffffff805830ab in kdb_enter (why=0xffffffff80932ea1 "panic", 
     msg=<value optimized out>) at cpufunc.h:63
 #10 0xffffffff80543003 in vpanic (fmt=<value optimized out>, 
     ap=0xfffffe044117fa20) at /usr/src/sys/kern/kern_shutdown.c:772
 #11 0xffffffff80542e56 in kassert_panic (fmt=<value optimized out>)
     at /usr/src/sys/kern/kern_shutdown.c:669
 #12 0xffffffff8064134f in _task_fn_rx (context=<value optimized out>)
     at /usr/src/sys/net/iflib.c:2242
 #13 0xffffffff80581e59 in gtaskqueue_run_locked (queue=<value optimized out>)
     at /usr/src/sys/kern/subr_gtaskqueue.c:327
 #14 0xffffffff80581be8 in gtaskqueue_thread_loop (arg=<value optimized out>)
     at /usr/src/sys/kern/subr_gtaskqueue.c:502
 #15 0xffffffff805080b4 in fork_exit (
     callout=0xffffffff80581b60 <gtaskqueue_thread_loop>, 
     arg=0xfffffe00010e3080, frame=0xfffffe044117fc00)
     at /usr/src/sys/kern/kern_fork.c:1038
 #16 0xffffffff8080e1de in fork_trampoline ()
     at /usr/src/sys/amd64/amd64/exception.S:611
 #17 0x0000000000000000 in ?? ()
 Current language:  auto; currently minimal
 (kgdb)

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