Details
Major Description
marko noticed a deadlock in safe_process, in exit() from a signal hander.
Quoth the StackOverflow https://stackoverflow.com/a/8833602/547065 talking about async-signal-safe-functions in POSIX: "...you can see functions _Exit(), _exit() and abort(), but notably not exit(). So you shalt not call it from a signal handler."
See also http://pubs.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_04.html
Thread 1 (Thread 0x7f1e8904e740 (LWP 6393)):
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#0 __lll_lock_wait_private ()
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at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
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#1 0x00007f1e87f8371b in __run_exit_handlers (status=5,
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listp=0x7f1e88300718 <__exit_funcs>,
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run_list_atexit=run_list_atexit@entry=true, run_dtors=run_dtors@entry=true)
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at exit.c:56
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#2 0x00007f1e87f8392a in __GI_exit (status=<optimized out>) at exit.c:139
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#3 0x0000558b27bce288 in kill_child (was_killed=false)
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at /mariadb/10.3/mysql-test/lib/My/SafeProcess/safe_process.cc:119
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#4 0x0000558b27bce32e in handle_signal (sig=15)
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at /mariadb/10.3/mysql-test/lib/My/SafeProcess/safe_process.cc:139
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#5 <signal handler called>
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#6 __run_exit_handlers (status=0, listp=0x7f1e88300718 <__exit_funcs>,
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run_list_atexit=run_list_atexit@entry=true, run_dtors=run_dtors@entry=true)
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at exit.c:120
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#7 0x00007f1e87f8392a in __GI_exit (status=<optimized out>) at exit.c:139
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#8 0x0000558b27bce249 in kill_child (was_killed=true)
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at /mariadb/10.3/mysql-test/lib/My/SafeProcess/safe_process.cc:111
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#9 0x0000558b27bce32e in handle_signal (sig=17)
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at /mariadb/10.3/mysql-test/lib/My/SafeProcess/safe_process.cc:139
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#10 <signal handler called>
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#11 0x00007f1e88010404 in __GI___nanosleep (
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requested_time=requested_time@entry=0x7ffe7a09e860,
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remaining=remaining@entry=0x7ffe7a09e860)
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at ../sysdeps/unix/sysv/linux/nanosleep.c:28
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#12 0x00007f1e8801030a in __sleep (seconds=0) at ../sysdeps/posix/sleep.c:55
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#13 0x0000558b27bce9cf in main (argc=10, argv=0x7ffe7a09eb08)
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at /mariadb/10.3/mysql-test/lib/My/SafeProcess/safe_process.cc:301
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