Just after report about panic somewere in sendfile 

and disabling sendfile functionality in software (nginx) I got another kernel 
panic (at last twice for this moment)

System message after reboot:

Mar  5 05:49:11 srv11 savecore: reboot after panic: tcp_detach: INP_TIMEWAIT && 
Mar  5 05:49:11 srv11 savecore: writing core to /var/crash/vmcore.2

kgdb kernel.debug /var/crash/vmcore.2 is :

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Unread portion of the kernel message buffer:
panic: tcp_detach: INP_TIMEWAIT && INP_DROPPED && tp != NULL
cpuid = 11
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe1f9d1f4730
vpanic() at vpanic+0x182/frame 0xfffffe1f9d1f47b0
kassert_panic() at kassert_panic+0x126/frame 0xfffffe1f9d1f4820
tcp_usr_detach() at tcp_usr_detach+0x1bc/frame 0xfffffe1f9d1f4850
sofree() at sofree+0x1a6/frame 0xfffffe1f9d1f4880
tcp_close() at tcp_close+0x11e/frame 0xfffffe1f9d1f48b0
tcp_timer_2msl() at tcp_timer_2msl+0x278/frame 0xfffffe1f9d1f48e0
softclock_call_cc() at softclock_call_cc+0x1af/frame 0xfffffe1f9d1f49c0
softclock() at softclock+0x47/frame 0xfffffe1f9d1f49e0
intr_event_execute_handlers() at intr_event_execute_handlers+0x96/frame 
ithread_loop() at ithread_loop+0xa6/frame 0xfffffe1f9d1f4a70
fork_exit() at fork_exit+0x84/frame 0xfffffe1f9d1f4ab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe1f9d1f4ab0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic

Reading symbols from /boot/kernel/zfs.ko...Reading symbols from 
Loaded symbols for /boot/kernel/zfs.ko
Reading symbols from /boot/kernel/opensolaris.ko...Reading symbols from 
Loaded symbols for /boot/kernel/opensolaris.ko
Reading symbols from /boot/kernel/carp.ko...Reading symbols from 
Loaded symbols for /boot/kernel/carp.ko
Reading symbols from /boot/kernel/ums.ko...Reading symbols from 
Loaded symbols for /boot/kernel/ums.ko
Reading symbols from /boot/kernel/tmpfs.ko...Reading symbols from 
Loaded symbols for /boot/kernel/tmpfs.ko
#0  doadump (textdump=0) at pcpu.h:221
221             __asm("movq %%gs:%1,%0" : "=r" (td)
(kgdb) bt
#0  doadump (textdump=0) at pcpu.h:221
#1  0xffffffff80384a0b in db_dump (dummy=<value optimized out>, dummy2=false, 
dummy3=0, dummy4=0x0) at /usr/src/sys/ddb/db_command.c:533
#2  0xffffffff803847fe in db_command (cmd_table=0x0) at 
#3  0xffffffff80384594 in db_command_loop () at 
#4  0xffffffff8038702b in db_trap (type=<value optimized out>, code=0) at 
#5  0xffffffff80a656e3 in kdb_trap (type=3, code=0, tf=<value optimized out>) 
at /usr/src/sys/kern/subr_kdb.c:654
#6  0xffffffff80ea1298 in trap (frame=0xfffffe1f9d1f4660) at 
#7  0xffffffff80e81a77 in calltrap () at 
#8  0xffffffff80a64dcb in kdb_enter (why=0xffffffff813b6c2f "panic", msg=0x80 
<Address 0x80 out of bounds>) at cpufunc.h:63
#9  0xffffffff80a27b5f in vpanic (fmt=<value optimized out>, ap=<value 
optimized out>) at /usr/src/sys/kern/kern_shutdown.c:750
#10 0xffffffff80a279b6 in kassert_panic (fmt=<value optimized out>) at 
#11 0xffffffff80bf9bbc in tcp_usr_detach (so=<value optimized out>) at 
#12 0xffffffff80aad0b6 in sofree (so=0xfffff81820f89000) at 
#13 0xffffffff80bf179e in tcp_close (tp=<value optimized out>) at 
#14 0xffffffff80bf72f8 in tcp_timer_2msl (xtp=0xfffff81650263820) at 
#15 0xffffffff80a3d72f in softclock_call_cc (c=0xfffff81650263b68, 
cc=0xffffffff81d2db80, direct=0) at /usr/src/sys/kern/kern_timeout.c:723
#16 0xffffffff80a3dae7 in softclock (arg=<value optimized out>) at 
#17 0xffffffff809ee7b6 in intr_event_execute_handlers (p=<value optimized out>, 
ie=0xfffff80114558d00) at /usr/src/sys/kern/kern_intr.c:1262
#18 0xffffffff809eee46 in ithread_loop (arg=0xfffff8011452fac0) at 
#19 0xffffffff809ec074 in fork_exit (callout=0xffffffff809eeda0 <ithread_loop>, 
arg=0xfffff8011452fac0, frame=0xfffffe1f9d1f4ac0)
    at /usr/src/sys/kern/kern_fork.c:1034
#20 0xffffffff80e81fae in fork_trampoline () at 
#21 0x0000000000000000 in ?? ()
Current language:  auto; currently minimal

kernel.debug and cores can be found here . http://hell.ukr.net/free/  (vmcore.1 
and vmcore.2 for this panic)

Some addition info  If_igb, carp and pf used on server.

I would appreciate any kind of help in solving the problem.

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