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Date:      Mon, 30 Jan 2017 19:46:45 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-bugs@FreeBSD.org
Subject:   [Bug 216613] VIMAGE and TCP_RFC7413 panic: CURVNET_SET at /usr/src/sys/netinet/tcp_fastopen.c:270 tcp_fastopen_autokey_callout() curvnet=0 vnet=0
Message-ID:  <bug-216613-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216613

            Bug ID: 216613
           Summary: VIMAGE and TCP_RFC7413 panic: CURVNET_SET at
                    /usr/src/sys/netinet/tcp_fastopen.c:270
                    tcp_fastopen_autokey_callout() curvnet=0 vnet=0
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: alex.deiter@gmail.com
                CC: freebsd-amd64@FreeBSD.org
                CC: freebsd-amd64@FreeBSD.org

Created attachment 179438
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=179438&action=edit
kernel config

The most recent CURRENT [r312928] with enabled kernel options VIMAGE and
TCP_RFC7413 panics spontaneously:

(kgdb) where
#0  doadump (textdump=0) at pcpu.h:222
#1  0xffffffff803a152b in db_dump (dummy=<value optimized out>, dummy2=<value
optimized out>, dummy3=<value optimized out>, 
    dummy4=<value optimized out>) at /usr/src/sys/ddb/db_command.c:546
#2  0xffffffff803a132f in db_command (cmd_table=<value optimized out>) at
/usr/src/sys/ddb/db_command.c:453
#3  0xffffffff803a10a4 in db_command_loop () at
/usr/src/sys/ddb/db_command.c:506
#4  0xffffffff803a40ff in db_trap (type=<value optimized out>, code=<value
optimized out>) at /usr/src/sys/ddb/db_main.c:248
#5  0xffffffff80b171e3 in kdb_trap (type=<value optimized out>, code=<value
optimized out>, tf=<value optimized out>)
    at /usr/src/sys/kern/subr_kdb.c:654
#6  0xffffffff80f77bc9 in trap (frame=0xfffffe0456d9e710) at
/usr/src/sys/amd64/amd64/trap.c:537
#7  0xffffffff80f5a971 in calltrap () at
/usr/src/sys/amd64/amd64/exception.S:236
#8  0xffffffff80b1690b in kdb_enter (why=0xffffffff814cc5c0 "panic", msg=<value
optimized out>) at cpufunc.h:63
#9  0xffffffff80acbd13 in vpanic (fmt=<value optimized out>,
ap=0xfffffe0456d9e8a0) at /usr/src/sys/kern/kern_shutdown.c:772
#10 0xffffffff80acbb63 in panic (fmt=<value optimized out>) at
/usr/src/sys/kern/kern_shutdown.c:710
#11 0xffffffff80cf945b in tcp_fastopen_autokey_callout (arg=0xfffffe0000d25f10)
at /usr/src/sys/netinet/tcp_fastopen.c:270
#12 0xffffffff80ae5f36 in softclock_call_cc (c=<value optimized out>, cc=<value
optimized out>, direct=<value optimized out>)
    at /usr/src/sys/kern/kern_timeout.c:729
#13 0xffffffff80ae64d4 in softclock (arg=<value optimized out>) at
/usr/src/sys/kern/kern_timeout.c:867
#14 0xffffffff80a8696f in intr_event_execute_handlers (p=<value optimized out>,
ie=<value optimized out>)
    at /usr/src/sys/kern/kern_intr.c:1262
#15 0xffffffff80a86f76 in ithread_loop (arg=<value optimized out>) at
/usr/src/sys/kern/kern_intr.c:1275
#16 0xffffffff80a83545 in fork_exit (callout=0xffffffff80a86eb0 <ithread_loop>,
arg=0xfffff80005493040, frame=0xfffffe0456d9eac0)
    at /usr/src/sys/kern/kern_fork.c:1038
#17 0xffffffff80f5aeae in fork_trampoline () at
/usr/src/sys/amd64/amd64/exception.S:611
#18 0x0000000000000000 in ?? ()
(kgdb) 

(kgdb) up 11
#11 0xffffffff80cf945b in tcp_fastopen_autokey_callout (arg=0xfffffe0000d25f10)
at /usr/src/sys/netinet/tcp_fastopen.c:270
270             CURVNET_SET(ctx->v);
(kgdb) 

(kgdb) list
265     {
266             struct tcp_fastopen_callout *ctx = arg;
267     
268             KASSERT(ctx != NULL, ("tcp_fastopen_autokey_callout: arg is
NULL"));
269     
270             CURVNET_SET(ctx->v);
271             tcp_fastopen_autokey_locked();
272             callout_reset(&ctx->c, V_tcp_fastopen_autokey * hz,
273                           tcp_fastopen_autokey_callout, ctx);
274             CURVNET_RESTORE();
(kgdb) 

(kgdb) info local
saved_vnet = (struct vnet *) 0xffffffff81e64f38
saved_vnet_lpush = 0x0

(kgdb) print *saved_vnet
$2 = {vnet_le = {le_next = 0x1, le_prev = 0x0}, vnet_magic_n = 0, vnet_ifcnt =
0, vnet_sockcnt = 0, vnet_state = 0, 
  vnet_data_mem = 0x0, vnet_data_base = 256}
(kgdb) 

Kernel config: GENERIC + VIMAGE and TCP_RFC7413 options

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