[Bug 231659] 12-ALPHA7 r338900 crashes with IPsec on network load

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231659

--- Comment #12 from Lev A. Serebryakov <lev at FreeBSD.org> ---
Ok. Now I have kernel with INVARIANTs and WITNESS and I have space fro
crashdumps.
I've got 3 crashdumps with exactly same panic message:

Assertion (staterr & E1000_RXD_STAT_DD) != 0 failed at
/data/src/sys/dev/e1000/em_txrx.c:698

Here is stacktrace:

#0  doadump (textdump=1) at pcpu.h:230
#1  0xffffffff80565a70 in kern_reboot (howto=260) at
/data/src/sys/kern/kern_shutdown.c:446
#2  0xffffffff80565ec3 in vpanic (fmt=<value optimized out>, ap=<value
optimized out>) at /data/src/sys/kern/kern_shutdown.c:872
#3  0xffffffff80565c23 in panic (fmt=<value optimized out>) at
/data/src/sys/kern/kern_shutdown.c:799
#4  0xffffffff803f1de4 in em_isc_rxd_pkt_get (arg=<value optimized out>,
ri=<value optimized out>) at /data/src/sys/dev/e1000/em_txrx.c:698
#5  0xffffffff806688d8 in iflib_rxeof (rxq=0xfffff80002295800, budget=<value
optimized out>) at /data/src/sys/net/iflib.c:2684
#6  0xffffffff80664d19 in _task_fn_rx (context=0xfffff80002295800) at
/data/src/sys/net/iflib.c:3820
#7  0xffffffff805a5e49 in gtaskqueue_run_locked (queue=0xfffff800021dc400) at
/data/src/sys/kern/subr_gtaskqueue.c:332
#8  0xffffffff805a5c08 in gtaskqueue_thread_loop (arg=<value optimized out>) at
/data/src/sys/kern/subr_gtaskqueue.c:507
#9  0xffffffff8052f5c4 in fork_exit (callout=0xffffffff805a5b80
<gtaskqueue_thread_loop>, arg=0xfffffe00017f8008, frame=0xfffffe000043ac00) at
/data/src/sys/kern/kern_fork.c:1057
#10 0xffffffff8081cbfe in fork_trampoline () at
/data/src/sys/amd64/amd64/exception.S:993
#11 0x0000000000000000 in ?? ()

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