[Fast-Reboot] Fix: Traceback bug after performing fast-reboot #2
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Signed-off-by: tshalvi <tshalvi@r-build-sonic04.mtr.labs.mlnx>
dprital
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Jan 15, 2023
tshalvi
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Dec 17, 2024
…et#21095) Adding the below fix from FRR FRRouting/frr#17297 This is to fix the following crash which is a statistical issue [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Core was generated by `/usr/lib/frr/zebra -A 127.0.0.1 -s 90000000 -M dplane_fpm_nl -M snmp'. Program terminated with signal SIGABRT, Aborted. #0 0x00007fccd7351e2c in ?? () from /lib/x86_64-linux-gnu/libc.so.6 [Current thread is 1 (Thread 0x7fccd6faf7c0 (LWP 36))] (gdb) bt #0 0x00007fccd7351e2c in ?? () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x00007fccd7302fb2 in raise () from /lib/x86_64-linux-gnu/libc.so.6 #2 0x00007fccd72ed472 in abort () from /lib/x86_64-linux-gnu/libc.so.6 #3 0x00007fccd75bb3a9 in _zlog_assert_failed (xref=xref@entry=0x7fccd7652380 <_xref.16>, extra=extra@entry=0x0) at ../lib/zlog.c:678 #4 0x00007fccd759b2fe in route_node_delete (node=<optimized out>) at ../lib/table.c:352 #5 0x00007fccd759b445 in route_unlock_node (node=0x0) at ../lib/table.h:258 #6 route_next (node=<optimized out>) at ../lib/table.c:436 #7 route_next (node=node@entry=0x56029d89e560) at ../lib/table.c:410 #8 0x000056029b6b6b7a in if_lookup_by_name_per_ns (ns=ns@entry=0x56029d873d90, ifname=ifname@entry=0x7fccc0029340 "PortChannel1020") at ../zebra/interface.c:312 #9 0x000056029b6b8b36 in zebra_if_dplane_ifp_handling (ctx=0x7fccc0029310) at ../zebra/interface.c:1867 #10 zebra_if_dplane_result (ctx=0x7fccc0029310) at ../zebra/interface.c:2221 #11 0x000056029b7137a9 in rib_process_dplane_results (thread=<optimized out>) at ../zebra/zebra_rib.c:4810 #12 0x00007fccd75a0e0d in thread_call (thread=thread@entry=0x7ffe8e553cc0) at ../lib/thread.c:1990 #13 0x00007fccd7559368 in frr_run (master=0x56029d65a040) at ../lib/libfrr.c:1198 #14 0x000056029b6ac317 in main (argc=9, argv=0x7ffe8e5540d8) at ../zebra/main.c:478
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Signed-off-by: tshalvi tshalvi@r-build-sonic04.mtr.labs.mlnx
Fixes #3294192
Why I did it
There is a queue in sysmonitor.py that is created based on an object of multiprocessing.Manager.
After performing fast-reboot, system health monitor is being shut down, what causes this Manager to be shut down as well, since it is a child-process of healthd.
That's why I moved the creation of this Manager from the top of the file to the function Sysmonitor.system_service() (The only place it is used), to make Manager a child-process of Sysmonitor, instead of Healthd. This way both the queue (the Manager) and the processes that uses this queue will be child-processes of the same process, and the problematic scenario of sysmonitor sending messages to a dead queue will not be possible.
How I did it
Removed the definition of manager as global and moved it to system_service() function
How to verify it
Perform a fast reboot and verify the traceback issue is fixed
Which release branch to backport (provide reason below if selected)
Description for the changelog
Ensure to add label/tag for the feature raised. example - PR#2174 under sonic-utilities repo. where, Generic Config and Update feature has been labelled as GCU.
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)