Panic in route.c:579 on SSH connect with 11-CURRENT at r293913

[Yamagi Burmeister]

Hello,
with 11-CURRENT at r293913 I'm seeing this panic as soon as I'm trying
to connect through SSH:


Unread portion of the kernel message buffer:
panic: _mtx_lock_sleep: recursed on non-recursive mutex rtentry
@ /usr/src/sys/net/route.c:579

(kgdb) bt
#0  doadump (textdump=-2122574672) at pcpu.h:221
#1  0xffffffff803823b6 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:568
#2  0xffffffff80381e4e in db_command (cmd_table=0x0)
    at /usr/src/sys/ddb/db_command.c:440
#3  0xffffffff80381be4 in db_command_loop ()
    at /usr/src/sys/ddb/db_command.c:493
#4  0xffffffff8038467b in db_trap (type=<value optimized out>, code=0)
    at /usr/src/sys/ddb/db_main.c:251
#5  0xffffffff80a5d893 in kdb_trap (type=3, code=0, tf=<value optimized out>)
    at /usr/src/sys/kern/subr_kdb.c:654
#6  0xffffffff80e6a2a8 in trap (frame=0xfffffe011b3b21e0)
    at /usr/src/sys/amd64/amd64/trap.c:556
#7  0xffffffff80e4ad47 in calltrap ()
    at /usr/src/sys/amd64/amd64/exception.S:234
#8  0xffffffff80a5cf7b in kdb_enter (why=0xffffffff8137b8dc "panic", 
    msg=0x80 <Address 0x80 out of bounds>) at cpufunc.h:63
#9  0xffffffff80a2046f in vpanic (fmt=<value optimized out>, 
    ap=<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:750
#10 0xffffffff80a202c6 in kassert_panic (fmt=<value optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:647
#11 0xffffffff80a04441 in __mtx_lock_sleep (c=0xfffff80006b89cf0, 
    tid=<value optimized out>, opts=<value optimized out>, 
    file=<value optimized out>, line=1) at /usr/src/sys/kern/kern_mutex.c:396
#12 0xffffffff80a0412d in __mtx_lock_flags (c=<value optimized out>, opts=0, 
    file=0xffffffff81395a63 "/usr/src/sys/net/route.c", line=579)
    at /usr/src/sys/kern/kern_mutex.c:222
#13 0xffffffff80b10ffe in rtredirect_fib (dst=0xfffffe011b3b2600, 
    gateway=0xfffffe011b3b25f0, netmask=0x0, flags=6, src=0xfffffe011b3b25e0, 
    fibnum=0) at /usr/src/sys/net/route.c:579
#14 0xffffffff80b6cad7 in icmp_input (mp=0xfffffe011b3b2670, 
    offp=0xfffffe011b3b266c, proto=1) at /usr/src/sys/netinet/ip_icmp.c:614
#15 0xffffffff80b6d5cd in ip_input (m=0x4)
    at /usr/src/sys/netinet/ip_input.c:786
#16 0xffffffff80b0c861 in netisr_dispatch_src (proto=<value optimized out>, 
    source=<value optimized out>, m=0xfffff80006720b00)
    at /usr/src/sys/net/netisr.c:972
#17 0xffffffff80b029be in ether_demux (ifp=<value optimized out>, 
    m=<value optimized out>) at /usr/src/sys/net/if_ethersubr.c:803
#18 0xffffffff80b03704 in ether_nh_input (m=<value optimized out>)
    at /usr/src/sys/net/if_ethersubr.c:609
#19 0xffffffff80b0c861 in netisr_dispatch_src (proto=<value optimized out>, 
    source=<value optimized out>, m=0xfffff80006720b00)
    at /usr/src/sys/net/netisr.c:972
#20 0xffffffff80b02cbf in ether_input (ifp=0xfffff80003f2b000, m=0x0)
    at /usr/src/sys/net/if_ethersubr.c:713
#21 0xffffffff808a1b43 in vtnet_rxq_eof (rxq=0xfffff80003f06e00)
    at /usr/src/sys/dev/virtio/network/if_vtnet.c:1732
#22 0xffffffff808a284e in vtnet_rx_vq_intr (xrxq=0xfffff80003f06e00)
    at /usr/src/sys/dev/virtio/network/if_vtnet.c:1863
#23 0xffffffff809e8ef6 in intr_event_execute_handlers (
    p=<value optimized out>, ie=0xfffff80003ede200)
    at /usr/src/sys/kern/kern_intr.c:1262
#24 0xffffffff809e9586 in ithread_loop (arg=0xfffff80003cbbc60)
    at /usr/src/sys/kern/kern_intr.c:1275
#25 0xffffffff809e67b4 in fork_exit (
    callout=0xffffffff809e94e0 <ithread_loop>, arg=0xfffff80003cbbc60, 
    frame=0xfffffe011b3b29c0) at /usr/src/sys/kern/kern_fork.c:1010
#26 0xffffffff80e4b27e in fork_trampoline ()
    at /usr/src/sys/amd64/amd64/exception.S:609
#27 0x0000000000000000 in ?? ()
Current language:  auto; currently minimal


This a a byhve VM with an VirtIO network adapter:

virtio_pci0: <VirtIO PCI Network adapter> port 0x2000-0x201f mem 0xc0000000-0xc0001fff irq 16 at device 2.0 on pci0
vtnet0: <VirtIO Networking Adapter> on virtio_pci0
vtnet0: Ethernet address: 00:a0:98:51:ed:26
001.000048 [ 421] vtnet_netmap_attach       max rings 1
vtnet0: netmap queues/slots: TX 1/1024, RX 1/1024
001.000049 [ 426] vtnet_netmap_attach       virtio attached txq=1, txd=1024 rxq=1, rxd=1024


This may be caused by the recent routing work, but I'm not quite
sure. I have the dump and I'm able to reproduce this easily so
more information can be provided if necessary.

Regards,
Yamagi

-- 
Homepage:  www.yamagi.org
XMPP:      yamagi at yamagi.org
GnuPG/GPG: 0xEFBCCBCB