Re: kern/55489: double can cloner attach

To: kern-bug-people%netbsd.org@localhost,gnats-admin%netbsd.org@localhost,netbsd-bugs%netbsd.org@localhost,prlw1%cam.ac.uk@localhost
Subject: Re: kern/55489: double can cloner attach
From: Martin Husemann <martin%duskware.de@localhost>
Date: Tue, 21 Jul 2020 17:55:01 +0000 (UTC)
The following reply was made to PR kern/55489; it has been noted by GNATS.

From: Martin Husemann <martin%duskware.de@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/55489: double can cloner attach
Date: Tue, 21 Jul 2020 19:51:47 +0200

 [/tmp] martin@martins > gdb rump_allserver
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 Reading symbols from rump_allserver...
 Reading symbols from /usr/libdata/debug//usr/bin/rump_allserver.debug...
 (gdb) break if_clone_attach
 Function "if_clone_attach" not defined.
 Make breakpoint pending on future shared library load? (y or [n]) y
 Breakpoint 1 (if_clone_attach) pending.
 (gdb) run -sv unix:///tmp/sock  
 Starting program: /usr/bin/rump_allserver -sv unix:///tmp/sock
 [   1.0000000] Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
 [   1.0000000]     2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
 [   1.0000000]     2018, 2019, 2020 The NetBSD Foundation, Inc.  All rights reserved.
 [   1.0000000] Copyright (c) 1982, 1986, 1989, 1991, 1993
 [   1.0000000]     The Regents of the University of California.  All rights reserved.
 
 [   1.0000000] NetBSD 9.99.69 (RUMP-ROAST)
 [   1.0000000] total memory = unlimited (host limit)
 [   1.0000000] pool redzone disabled for 'kmem-04096'
 [   1.0000000] entropy: no seed from bootloader
 [   1.0000000] entropy: ready
 [   1.0000000] timecounter: Timecounters tick every 10.000 msec
 [   1.0000040] timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
 [New LWP 15297 of process 8665]
 [New LWP 15191 of process 8665]
 [New LWP 4171 of process 8665]
 [New LWP 17344 of process 8665]
 [New LWP 28443 of process 8665]
 [New LWP 17598 of process 8665]
 [New LWP 17958 of process 8665]
 [New LWP 12184 of process 8665]
 [New LWP 16263 of process 8665]
 [New LWP 3480 of process 8665]
 [New LWP 9358 of process 8665]
 [   1.0000050] cpu0 at thinair0: rump virtual cpu
 [New LWP 28766 of process 8665]
 [New LWP 2937 of process 8665]
 [New LWP 6200 of process 8665]
 [   1.0000050] cpu1 at thinair0: rump virtual cpu
 [New LWP 8898 of process 8665]
 [New LWP 4742 of process 8665]
 [New LWP 19669 of process 8665]
 [New LWP 6707 of process 8665]
 [   1.0100050] WARNING: ZFS on NetBSD is under development
 [   1.0100050] pool redzone disabled for 'zio_buf_4096'
 [   1.0100050] pool redzone disabled for 'zio_data_buf_4096'
 [   1.0100050] pool redzone disabled for 'zio_buf_8192'
 [   1.0100050] pool redzone disabled for 'zio_data_buf_8192'
 [   1.0100050] pool redzone disabled for 'zio_buf_16384'
 [   1.0100050] pool redzone disabled for 'zio_data_buf_16384'
 [   1.0100050] pool redzone disabled for 'zio_buf_32768'
 [   1.0100050] pool redzone disabled for 'zio_data_buf_32768'
 [   1.0100050] pool redzone disabled for 'zio_buf_65536'
 [   1.0100050] pool redzone disabled for 'zio_data_buf_65536'
 [   1.0100050] pool redzone disabled for 'zio_buf_131072'
 [   1.0100050] pool redzone disabled for 'zio_data_buf_131072'
 [   1.0100050] pool redzone disabled for 'zio_buf_262144'
 [   1.0100050] pool redzone disabled for 'zio_data_buf_262144'
 [   1.0100050] pool redzone disabled for 'zio_buf_524288'
 [   1.0100050] pool redzone disabled for 'zio_data_buf_524288'
 [   1.0100050] pool redzone disabled for 'zio_buf_1048576'
 [   1.0100050] pool redzone disabled for 'zio_data_buf_1048576'
 [   1.0100050] pool redzone disabled for 'zio_buf_2097152'
 [   1.0100050] pool redzone disabled for 'zio_data_buf_2097152'
 [   1.0100050] pool redzone disabled for 'zio_buf_4194304'
 [   1.0100050] pool redzone disabled for 'zio_data_buf_4194304'
 [   1.0100050] pool redzone disabled for 'zio_buf_8388608'
 [   1.0100050] pool redzone disabled for 'zio_data_buf_8388608'
 [   1.0100050] pool redzone disabled for 'zio_buf_16777216'
 [   1.0100050] pool redzone disabled for 'zio_data_buf_16777216'
 [New LWP 20549 of process 8665]
 [New LWP 13999 of process 8665]
 [New LWP 19026 of process 8665]
 [New LWP 9032 of process 8665]
 [New LWP 14485 of process 8665]
 [   1.0100050] ZFS filesystem version: 5
 [New LWP 15319 of process 8665]
 [   1.0100050] pool redzone disabled for 'buf64k'
 [   1.0100050] root file system type: rumpfs
 [   1.0100050] kern.module.path=/stand/amd64/9.99.69/modules
 [New LWP 6620 of process 8665]
 [New LWP 1833 of process 8665]
 [New LWP 13437 of process 8665]
 [New LWP 5521 of process 8665]
 [New LWP 29785 of process 8665]
 [New LWP 1774 of process 8665]
 [New LWP 23177 of process 8665]
 [New LWP 19136 of process 8665]
 [New LWP 21757 of process 8665]
 [New LWP 21336 of process 8665]
 [New LWP 22281 of process 8665]
 [New LWP 8949 of process 8665]
 [New LWP 14210 of process 8665]
 [New LWP 8660 of process 8665]
 [New LWP 3758 of process 8665]
 [   3.5900050] IPsec: Initialized Security Association Processing.
 [New LWP 7951 of process 8665]
 [New LWP 3147 of process 8665]
 
 Thread 1 "" hit Breakpoint 1, if_clone_attach (ifc=0x73e55d40a360)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 1720	{
 (gdb) bt
 #0  if_clone_attach (ifc=0x73e55d40a360)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 #1  0x000073e5572bef7b in rump_component_init (
     type=type@entry=RUMP_COMPONENT_NET_IF)
     at /usr/src/lib/librump/../../sys/rump/librump/rumpkern/rump.c:602
 #2  0x000073e557a0cf9d in rumpcompinitRUMP__FACTION_NET ()
     at /usr/src/lib/librumpnet/../../sys/rump/librump/rumpnet/rump_net.c:57
 #3  0x000073e5572bef7b in rump_component_init (
     type=type@entry=RUMP__FACTION_NET)
     at /usr/src/lib/librump/../../sys/rump/librump/rumpkern/rump.c:602
 #4  0x000073e5572bf4a3 in rump_init ()
     at /usr/src/lib/librump/../../sys/rump/librump/rumpkern/rump.c:436
 #5  0x0000000038802c21 in main (argc=<optimized out>, argv=0x7f7fff010808)
     at /usr/src/usr.bin/rump_allserver/rump_allserver.c:401
 (gdb) p ifc
 $1 = (struct if_clone *) 0x73e55d40a360
 (gdb) p *ifc
 $2 = {ifc_list = {le_next = 0x0, le_prev = 0x0}, 
   ifc_name = 0x73e55d208661 "bridge", ifc_namelen = 6, 
   ifc_create = 0x73e55d2049d0 <bridge_clone_create>, 
   ifc_destroy = 0x73e55d205b4b <bridge_clone_destroy>}
 (gdb) c
 Continuing.
 
 Thread 1 "" hit Breakpoint 1, if_clone_attach (ifc=0x73e55d0c9b60)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 1720	{
 (gdb) p *ifc
 $3 = {ifc_list = {le_next = 0x0, le_prev = 0x0}, 
   ifc_name = 0x73e55ceaf531 "lo", ifc_namelen = 2, 
   ifc_create = 0x73e55ce94cf7 <loop_clone_create>, 
   ifc_destroy = 0x73e55ce94cbb <loop_clone_destroy>}
 (gdb) c
 Continuing.
 
 Thread 1 "" hit Breakpoint 1, if_clone_attach (ifc=0x73e55c406380)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 1720	{
 (gdb) p *ifc
 $4 = {ifc_list = {le_next = 0x0, le_prev = 0x0}, 
   ifc_name = 0x73e55c204cae "canlo", ifc_namelen = 5, 
   ifc_create = 0x73e55c202c66 <canloop_clone_create>, 
   ifc_destroy = 0x73e55c202d0e <canloop_clone_destroy>}
 (gdb) bt
 #0  if_clone_attach (ifc=0x73e55c406380)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 #1  0x000073e5572bef7b in rump_component_init (
     type=type@entry=RUMP_COMPONENT_NET_IF)
     at /usr/src/lib/librump/../../sys/rump/librump/rumpkern/rump.c:602
 #2  0x000073e557a0cf9d in rumpcompinitRUMP__FACTION_NET ()
     at /usr/src/lib/librumpnet/../../sys/rump/librump/rumpnet/rump_net.c:57
 #3  0x000073e5572bef7b in rump_component_init (
     type=type@entry=RUMP__FACTION_NET)
     at /usr/src/lib/librump/../../sys/rump/librump/rumpkern/rump.c:602
 #4  0x000073e5572bf4a3 in rump_init ()
     at /usr/src/lib/librump/../../sys/rump/librump/rumpkern/rump.c:436
 #5  0x0000000038802c21 in main (argc=<optimized out>, argv=0x7f7fff010808)
     at /usr/src/usr.bin/rump_allserver/rump_allserver.c:401
 (gdb) c
 Continuing.
 
 Thread 1 "" hit Breakpoint 1, if_clone_attach (
     ifc=0x73e55d0c98c0 <rumpns_carp_cloner>)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 1720	{
 (gdb) p *ifc
 $5 = {ifc_list = {le_next = 0x0, le_prev = 0x0}, 
   ifc_name = 0x73e55ceae347 "carp", ifc_namelen = 4, 
   ifc_create = 0x73e55ce85c2b <carp_clone_create>, 
   ifc_destroy = 0x73e55ce8694b <carp_clone_destroy>}
 (gdb) c
 Continuing.
 
 Thread 1 "" hit Breakpoint 1, if_clone_attach (
     ifc=0x73e55b00b3c0 <rumpns_ipsec_cloner>)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 1720	{
 (gdb) p *ifc
 $6 = {ifc_list = {le_next = 0x0, le_prev = 0x0}, 
   ifc_name = 0x73e55ae09a84 "ipsec", ifc_namelen = 5, 
   ifc_create = 0x73e55ae049c6 <if_ipsec_clone_create>, 
   ifc_destroy = 0x73e55ae07c2f <if_ipsec_clone_destroy>}
 (gdb) c
 Continuing.
 
 Thread 1 "" hit Breakpoint 1, if_clone_attach (
     ifc=0x73e559805340 <rumpns_shmif_cloner>)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 1720	{
 (gdb) p *ifc
 $7 = {ifc_list = {le_next = 0x0, le_prev = 0x0}, 
   ifc_name = 0x73e559603d20 "shmif", ifc_namelen = 5, 
   ifc_create = 0x73e559602acb <shmif_clone>, 
   ifc_destroy = 0x73e5596026f7 <shmif_unclone>}
 (gdb) c
 Continuing.
 [New LWP 6209 of process 8665]
 [New LWP 4912 of process 8665]
 [   3.5900050] mainbus0 (root)
 [New LWP 19818 of process 8665]
 [New LWP 19823 of process 8665]
 
 Thread 1 "" hit Breakpoint 1, if_clone_attach (
     ifc=0x73e558403260 <rumpns_virt_cloner>)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 1720	{
 (gdb) p *ifc
 $8 = {ifc_list = {le_next = 0x0, le_prev = 0x0}, 
   ifc_name = 0x73e558202777 "virt", ifc_namelen = 4, 
   ifc_create = 0x73e558202047 <virtif_clone>, 
   ifc_destroy = 0x73e558201fd3 <virtif_unclone>}
 (gdb) c
 Continuing.
 
 Thread 1 "" hit Breakpoint 1, if_clone_attach (
     ifc=0x73e558c07340 <rumpns_vlan_cloner>)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 1720	{
 (gdb) p *ifc
 $9 = {ifc_list = {le_next = 0x0, le_prev = 0x0}, 
   ifc_name = 0x73e558a05e46 "vlan", ifc_namelen = 4, 
   ifc_create = 0x73e558a029d3 <vlan_clone_create>, 
   ifc_destroy = 0x73e558a037c1 <vlan_clone_destroy>}
 (gdb) c
 Continuing.
 
 Thread 1 "" hit Breakpoint 1, if_clone_attach (ifc=0x73e5590052a0)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 1720	{
 (gdb) p *ifc
 $10 = {ifc_list = {le_next = 0x0, le_prev = 0x0}, 
   ifc_name = 0x73e558e03d91 "tun", ifc_namelen = 3, 
   ifc_create = 0x73e558e02857 <tun_clone_create>, 
   ifc_destroy = 0x73e558e02658 <tun_clone_destroy>}
 (gdb) c
 Continuing.
 
 Thread 1 "" hit Breakpoint 1, if_clone_attach (
     ifc=0x73e559406420 <rumpns_tap_cloners>)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 1720	{
 (gdb) p *ifc
 $11 = {ifc_list = {le_next = 0x0, le_prev = 0x0}, 
   ifc_name = 0x73e559204c01 "tap", ifc_namelen = 3, 
   ifc_create = 0x73e559204010 <tap_clone_create>, 
   ifc_destroy = 0x73e559204b95 <tap_clone_destroy>}
 (gdb) c
 Continuing.
 
 Thread 1 "" hit Breakpoint 1, if_clone_attach (ifc=0x73e559c16500)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 1720	{
 (gdb) p *ifc
 $12 = {ifc_list = {le_next = 0x0, le_prev = 0x0}, 
   ifc_name = 0x73e559a11eeb "pppoe", ifc_namelen = 5, 
   ifc_create = 0x73e559a046ed <pppoe_clone_create>, 
   ifc_destroy = 0x73e559a0412b <pppoe_clone_destroy>}
 (gdb) c
 Continuing.
 
 Thread 1 "" hit Breakpoint 1, if_clone_attach (
     ifc=0x73e55a4083e0 <rumpns_l2tp_cloner>)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 1720	{
 (gdb) p *ifc
 $13 = {ifc_list = {le_next = 0x0, le_prev = 0x0}, 
   ifc_name = 0x73e55a207203 "l2tp", ifc_namelen = 4, 
   ifc_create = 0x73e55a2052f8 <l2tp_clone_create>, 
   ifc_destroy = 0x73e55a204f29 <l2tp_clone_destroy>}
 (gdb) c
 Continuing.
 [New LWP 21446 of process 8665]
 
 Thread 1 "" hit Breakpoint 1, if_clone_attach (ifc=0x73e55a8351a0)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 1720	{
 (gdb) p *ifc
 $14 = {ifc_list = {le_next = 0x0, le_prev = 0x0}, 
   ifc_name = 0x73e55a62845d "npflog", ifc_namelen = 6, 
   ifc_create = 0x73e55a60f927 <npflog_clone_create>, 
   ifc_destroy = 0x73e55a60f8b4 <npflog_clone_destroy>}
 (gdb) c
 Continuing.
 
 Thread 1 "" hit Breakpoint 1, if_clone_attach (ifc=0x73e55ac04260)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 1720	{
 (gdb) p *ifc
 $15 = {ifc_list = {le_next = 0x0, le_prev = 0x0}, 
   ifc_name = 0x73e55aa03090 "mpls", ifc_namelen = 4, 
   ifc_create = 0x73e55aa01dcb <mpls_clone_create>, 
   ifc_destroy = 0x73e55aa01d7d <mpls_clone_destroy>}
 (gdb) c
 Continuing.
 
 Thread 1 "" hit Breakpoint 1, if_clone_attach (ifc=0x73e55b4083e0)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 1720	{
 (gdb) p *ifc
 $16 = {ifc_list = {le_next = 0x0, le_prev = 0x0}, 
   ifc_name = 0x73e55b20704a "gif", ifc_namelen = 3, 
   ifc_create = 0x73e55b20432b <gif_clone_create>, 
   ifc_destroy = 0x73e55b2049b5 <gif_clone_destroy>}
 (gdb) c
 Continuing.
 
 Thread 1 "" hit Breakpoint 1, if_clone_attach (ifc=0x73e55c406380)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 1720	{
 (gdb) p *ifc
 $17 = {ifc_list = {le_next = 0x73e55d0c9b60, 
     le_prev = 0x73e55d0c98c0 <rumpns_carp_cloner>}, 
   ifc_name = 0x73e55c204cae "canlo", ifc_namelen = 5, 
   ifc_create = 0x73e55c202c66 <canloop_clone_create>, 
   ifc_destroy = 0x73e55c202d0e <canloop_clone_destroy>}
 (gdb) bt
 #0  if_clone_attach (ifc=0x73e55c406380)
     at /usr/src/sys/rump/net/lib/libnet/../../../../net/if.c:1720
 #1  0x000073e55c202ef0 in if_canloop_modcmd (cmd=<optimized out>, 
     arg=<optimized out>)
     at /usr/src/sys/rump/net/lib/libnetcan/../../../../netcan/if_canloop.c:224
 #2  0x000073e5572a13a3 in module_do_builtin (pmod=pmod@entry=0x73e56a848640, 
     name=<optimized out>, modp=modp@entry=0x0, props=props@entry=0x0)
     at /usr/src/lib/librump/../../sys/rump/../kern/kern_module.c:940
 #3  0x000073e5572a3155 in module_init_class (modclass=MODULE_CLASS_ANY)
     at /usr/src/lib/librump/../../sys/rump/../kern/kern_module.c:618
 #4  0x000073e5572bf51c in rump_init ()
     at /usr/src/lib/librump/../../sys/rump/librump/rumpkern/rump.c:455
 #5  0x0000000038802c21 in main (argc=<optimized out>, argv=0x7f7fff010808)
     at /usr/src/usr.bin/rump_allserver/rump_allserver.c:401
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