[question] emtpy result when read core file  #427

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1. No9 commented on Jan 4, 2023

   

   No9

   on Jan 4, 2023

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   Hi @kevalin
   It seems like you are debugging a crashed docker process rather than the node.js process.
   Can you confirm how you are running the docker container to obtain the node.js core dump?

   I would expect to see something like the following.
   Note the explicit volume mount so that the guest container can save to shared storage:
   e.g. docker run --ulimit core=-1 --mount source=coredumps_volume,target=/cores ab3ca583c907 ./node command

   And how the the host kernel.core_pattern is configured.
   e.g. On the docker host run sysctl -n kernel.core_pattern
2. kevalin commented on Jan 9, 2023

   

   kevalin

   on Jan 9, 2023

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   Hi @kevalin It seems like you are debugging a crashed docker process rather than the node.js process. Can you confirm how you are running the docker container to obtain the node.js core dump?

   I would expect to see something like the following. Note the explicit volume mount so that the guest container can save to shared storage: e.g. docker run --ulimit core=-1 --mount source=coredumps_volume,target=/cores ab3ca583c907 ./node command

   And how the the host kernel.core_pattern is configured. e.g. On the docker host run sysctl -n kernel.core_pattern

   Hello @No9

   This is my docker host config

   [root@xxx-0001 ~]# sysctl -n kernel.core_pattern
   core
   [root@xxx-0001 ~]# ulimit -a
   core file size          (blocks, -c) 0
   data seg size           (kbytes, -d) unlimited
   scheduling priority             (-e) 0
   file size               (blocks, -f) unlimited
   pending signals                 (-i) 63455
   max locked memory       (kbytes, -l) 64
   max memory size         (kbytes, -m) unlimited
   open files                      (-n) 65535
   pipe size            (512 bytes, -p) 8
   POSIX message queues     (bytes, -q) 819200
   real-time priority              (-r) 0
   stack size              (kbytes, -s) 8192
   cpu time               (seconds, -t) unlimited
   max user processes              (-u) 63455
   virtual memory          (kbytes, -v) unlimited
   file locks                      (-x) unlimited

   ---

   login in docker container

   /app # sysctl -a | grep core
   kernel.core_pattern = core
   kernel.core_pipe_limit = 0
   kernel.core_uses_pid = 1

   App directory of docker container has mounted to host volume, so I can read core file on my host.
3. kevalin

   closed this as completedon Jan 9, 2023
4. kevalin

   reopened this on Jan 9, 2023