bgpd: fix no bgp as-path access-list issue (backport #15387) #15436
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adding a tests about:
"no bgp as-path access-list" command.
the folloxing "clear bgp *" command leads to the
crash exhibited above.
a sleep had been added to capture the crash befor the end of scenario.
50 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
[Current thread is 1 (Thread 0x7f5f05cbb9c0 (LWP 1371086))]
(gdb) bt
context=0x7ffcf2c216c0) at lib/sigevent.c:248
acl_list=0x55c976ec03c0) at bgpd/bgp_aspath.c:1688
dummy=0x7ffcf2c22340, object=0x7ffcf2c21e70) at bgpd/bgp_routemap.c:2401
match_object=0x7ffcf2c21e70, set_object=0x7ffcf2c21e70, pref=0x0)
at lib/routemap.c:2687
attr=0x7ffcf2c220b0, afi=AFI_IP, safi=SAFI_UNICAST, rmap_name=0x0, label=0x0,
num_labels=0, dest=0x55c976ebeaf0) at bgpd/bgp_route.c:1807
addpath_id=0, attr=0x7ffcf2c22450, afi=AFI_IP, safi=SAFI_UNICAST, type=10,
sub_type=0, prd=0x0, label=0x0, num_labels=0, soft_reconfig=0, evpn=0x0)
at bgpd/bgp_route.c:4424
packet=0x7ffcf2c22410) at bgpd/bgp_route.c:6266
packet=0x7ffcf2c22410, mp_withdraw=false) at bgpd/bgp_packet.c:341
peer=0x55c976e89ed0, size=43) at bgpd/bgp_packet.c:2414
at bgpd/bgp_packet.c:3899
Signed-off-by: Francois Dumontet <[email protected]>
(cherry picked from commit 324fa21)
router bgp 65001
no bgp ebgp-requires-policy
neighbor 192.168.1.2 remote-as external
neighbor 192.168.1.2 timers 3 10
address-family ipv4 unicast
neighbor 192.168.1.2 route-map r2 in
exit-address-family
!
ip prefix-list p1 seq 5 permit 172.16.255.31/32
!
route-map r2 permit 10
match ip address prefix-list p1
set as-path exclude 65003
route-map r2 permit 20
set as-path exclude all
!
we make the following commands
bgp as-path access-list FIRST permit ^65
bgp as-path access-list SECOND permit 2
route-map r2 permit 6
set as-path exclude as-path-access-list SECOND
and then
no bgp as-path access-list SECOND permit 2
clear bgp *
we have the following crash in bgp
Stack trace of thread 536083:
#0 0x00007f87f8aacfe1 raise (libpthread.so.0 + 0x12fe1)
#1 0x00007f87f8cf6870 core_handler (libfrr.so.0 +
0xf6870)
#2 0x00007f87f8aad140 __restore_rt (libpthread.so.0 +
0x13140)
#3 0x00007f87f89a5122 __GI___regexec (libc.so.6 +
0xdf122)
#4 0x000055d7f198b4a7 aspath_filter_exclude_acl (bgpd +
0x2054a7)
#5 0x000055d7f1902187 route_set_aspath_exclude (bgpd +
0x17c187)
#6 0x00007f87f8ce54b0 route_map_apply_ext (libfrr.so.0
+ 0xe54b0)
#7 0x000055d7f18da925 bgp_input_modifier (bgpd +
0x154925)
#8 0x000055d7f18e0647 bgp_update (bgpd + 0x15a647)
#9 0x000055d7f18e4772 bgp_nlri_parse_ip (bgpd +
0x15e772)
#10 0x000055d7f18c38ae bgp_nlri_parse (bgpd + 0x13d8ae)
#11 0x000055d7f18c6b7a bgp_update_receive (bgpd +
0x140b7a)
#12 0x000055d7f18c8ff3 bgp_process_packet (bgpd +
0x142ff3)
#13 0x00007f87f8d0dce0 thread_call (libfrr.so.0 +
0x10dce0)
#14 0x00007f87f8cacb28 frr_run (libfrr.so.0 + 0xacb28)
#15 0x000055d7f18435da main (bgpd + 0xbd5da)
#16 0x00007f87f88e9d0a __libc_start_main (libc.so.6 +
0x23d0a)
#17 0x000055d7f18415fa _start (bgpd + 0xbb5fa)
analysis
crash is due to the fact that there were always a pointer from
as-path exclude to deleted as-path access list.
fix
we add a backpointer mechanism to manage the dependency beetween
as-path access-list and aspath exclude.
Signed-off-by: Francois Dumontet <[email protected]>
(cherry picked from commit 100ef15)
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