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66832e3a introduced change that prints core dumps like this:
#16 0x000055b86613e3d8 in do_handle_one_connection (connect=0x55b8699061f8, put_in_cache=true) at /home/midenok/src/mariadb/10.6/src/sql/sql_connect.cc:1418
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create_user = true
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thr_create_utime = 140576815727
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thd = 0x7f11c4000d58
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#17 0x000055b86613e03a in handle_one_connection (arg=0x55b8699f84a8) at /home/midenok/src/mariadb/10.6/src/sql/sql_connect.cc:1312
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connect = 0x55b8699f84a8
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#18 0x000055b8666b0a2f in pfs_spawn_thread (arg=0x55b86997b1d8) at /home/midenok/src/mariadb/10.6/src/storage/perfschema/pfs.cc:2201
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typed_arg = 0x55b86997b1d8
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user_arg = 0x55b8699f84a8
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user_start_routine = 0x55b86613dfe0 <handle_one_connection(void*)>
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pfs = 0x7f1203ebf7c0
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klass = 0x55b8691b5c80
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#19 0x00007f120461fb43 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442
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ret = <optimized out>
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pd = <optimized out>
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out = <optimized out>
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unwind_buf = {
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cancel_jmp_buf = {{
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jmp_buf = {140727175011760, -485359056267303735, 139715155310144, 2, 139715359668304, 140727175012112, 531522500273317065, 533571283848864969},
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mask_was_saved = 0
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}},
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priv = {
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pad = {0x0, 0x0, 0x0, 0x0},
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data = {
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prev = 0x0,
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cleanup = 0x0,
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canceltype = 0
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}
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}
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}
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not_first_call = <optimized out>
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That's completely out of user-friendliness but serves as a measure for debugging hard-reproducible bugs. The proper way to implement this:
1. it must be controlled by command-line and environment variable;
2. detailed traces must be default for buildbots only, for user invocations normal stack traces should be printed.
Options for control
MTR_PRINT_CORE and --print-core can accept the following values:
| no |
Don't print core |
| short |
Print normal trace like `bt` does |
| detailed |
Print detailed stack trace like in commit 66832e3a |
| custom:<code> |
Use GDB commands <code> to print stack trace |
Default behaviour
Should be detected by environment. If BUILDMASTER environment is non-null, defaults to "detailed", otherwise "short".
Environment
MTR_PRINT_CORE=no|short|detailed|custom:code
|
Wrong values are silently ignored (falls back to default behaviour).
Overrides default behavior.
Command-line
--print-core{=no|short|detailed|custom:code}
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When specified without value defaults to "short". Wrong values fail execution with error.
Overrides environment variable.
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new_buildbot_env.txt
print_env.test