[Bug 213232] [tcp] [panic] tcp_output() Panic String: tcp_output: len > IP_MAXPACKET (at r306658)

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Wed Oct 5 18:46:04 UTC 2016


            Bug ID: 213232
           Summary: [tcp] [panic] tcp_output() Panic String: tcp_output:
                    len > IP_MAXPACKET (at r306658)
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: hiren at FreeBSD.org

(kgdb) bt
#0  __curthread () at ./machine/pcpu.h:221
#1  doadump (textdump=492866688) at
#2  0xffffffff80395066 in db_fncall_generic (nargs=0, addr=<optimized out>,
rv=<optimized out>, args=<optimized out
    at /d0/hiren/freebsd/sys/ddb/db_command.c:581
#3  db_fncall (dummy1=<optimized out>, dummy2=<optimized out>,
dummy3=<optimized out>, dummy4=<optimized out>)
    at /d0/hiren/freebsd/sys/ddb/db_command.c:629
#4  0xffffffff80394bc9 in db_command (last_cmdp=<optimized out>,
cmd_table=<optimized out>, dopager=<optimized out>
    at /d0/hiren/freebsd/sys/ddb/db_command.c:453
#5  0xffffffff80394924 in db_command_loop () at
#6  0xffffffff803979df in db_trap (type=<optimized out>, code=<optimized out>)
at /d0/hiren/freebsd/sys/ddb/db_main
#7  0xffffffff80a90003 in kdb_trap (type=<optimized out>, code=<optimized out>,
tf=<optimized out>) at /d0/hiren/fr
#8  0xffffffff80ec5ce4 in trap (frame=0xfffffe201d6090f0) at
#9  <signal handler called>
#10 kdb_enter (why=0xffffffff813f7eb8 "panic", msg=0x80 <error: Cannot access
memory at address 0x80>) at /d0/hiren
#11 0xffffffff80a4e41f in vpanic (fmt=<optimized out>, ap=0xfffffe201d609280)
at /d0/hiren/freebsd/sys/kern/kern_sh
#12 0xffffffff80a4e276 in kassert_panic (fmt=0xffffffff8142a88d "%s: len >
IP_MAXPACKET") at /d0/hiren/freebsd/sys/
#13 0xffffffff80c3660a in tcp_output (tp=<optimized out>) at
#14 0xffffffff80c333a2 in tcp_do_segment (m=<optimized out>, th=<optimized
out>, so=<optimized out>, tp=<optimized 
    tlen=<optimized out>, iptos=<optimized out>, ti_locked=<error reading
variable: Cannot access memory at address
    at /d0/hiren/freebsd/sys/netinet/tcp_input.c:3169
#15 0xffffffff80c2f690 in tcp_input (mp=<optimized out>, offp=<optimized out>,
proto=<optimized out>) at /d0/hiren/
#16 0xffffffff80bbc901 in ip_input (m=0x4) at
#17 0xffffffff80b57630 in netisr_dispatch_src (proto=1, source=0,
m=0xfffff807bf186300) at /d0/hiren/freebsd/sys/ne
#18 0xffffffff80b4183a in ether_demux (ifp=<optimized out>, m=0x80) at
#19 0xffffffff80b42637 in ether_input_internal (ifp=<optimized out>, m=0x80) at
#20 ether_nh_input (m=<optimized out>) at
#21 0xffffffff80b57630 in netisr_dispatch_src (proto=5, source=0,
m=0xfffff807bf186300) at /d0/hiren/freebsd/sys/ne
#22 0xffffffff80b41ba2 in ether_input (ifp=<optimized out>, m=0x0) at
#23 0xffffffff805e2dcb in ixgbe_rx_input (rxr=<optimized out>, ifp=<optimized
out>, m=0xfffff807bf186300, ptype=<op
    at /d0/hiren/freebsd/sys/dev/ixgbe/ix_txrx.c:1704
#24 ixgbe_rxeof (que=<optimized out>) at
#25 0xffffffff805da70c in ixgbe_msix_que (arg=0xfffff80114812870) at
#26 0xffffffff80a147a6 in intr_event_execute_handlers (p=<optimized out>,
ie=<optimized out>) at /d0/hiren/freebsd/
#27 0xffffffff80a14e26 in ithread_execute_handlers (ie=<optimized out>,
p=<optimized out>) at /d0/hiren/freebsd/sys
#28 ithread_loop (arg=<optimized out>) at
#29 0xffffffff80a11eb4 in fork_exit (callout=0xffffffff80a14d80 <ithread_loop>,
arg=0xfffff801147babe0, frame=0xfff
    at /d0/hiren/freebsd/sys/kern/kern_fork.c:1038
#30 <signal handler called>

This box paniced while sitting idle. Just running -head and no special configs.

ix0 at pci0:4:0:0: class=0x020000 card=0x061115d9 chip=0x10fb8086 rev=0x01
    vendor     = 'Intel Corporation'
    device     = '82599ES 10-Gigabit SFI/SFP+ Network Connection'
    class      = network
    subclass   = ethernet

tso is on.

http://svn.freebsd.org/changeset/base/211317 added the check where its

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=132832 which caused r211317

I've not looked at it into much detail.

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