Details
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Bug
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Status: Open (View Workflow)
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Minor
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Resolution: Unresolved
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None
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None
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None
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None
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Debian Unstable
libmariadb from Debian package, version 10.6.7-3+b1
Description
Hi,
I have encountered an issue where a perl script which uses the MariaDB C connector (via DBD::MariaDB or DBD::mysql) ends up ignoring SIGPIPE. This results in problems such as:
- continuing to run even when the pipeline is broken
- printing an error on exit
I am pretty sure that I tracked this down to code in the C connector introduced in this commit:
https://github.com/mariadb-corporation/mariadb-connector-c/commit/1cefbbecb929b4b4a67b0ac23058ab0167e1c6d6#diff-478b1bbb2170532b687be58bd28e9850ccc0b9a6aec137eb8fff7b8e6d1107bbR3460
A backtrace seems to confirm this (note the ignore_sigpipe() at #4):
(gdb) bt
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#0 0x00007ffff7cab9f2 in __GI___libc_sigaction (sig=sig@entry=13, act=act@entry=0x7fffffffd950,
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oact=oact@entry=0x7fffffffd9f0) at ../sysdeps/unix/sysv/linux/sigaction.c:58
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#1 0x00007ffff7cabb25 in __GI___sigaction (sig=sig@entry=13, act=act@entry=0x7fffffffd950, oact=oact@entry=0x7fffffffd9f0)
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at ../nptl/sigaction.c:30
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#2 0x00007ffff7cab6e5 in __bsd_signal (sig=sig@entry=13, handler=handler@entry=0x1) at ../sysdeps/posix/signal.c:45
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#3 0x00007ffff7cab73b in __bsd_signal (sig=sig@entry=13, handler=handler@entry=0x1) at ../sysdeps/posix/signal.c:35
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#4 0x00007ffff78ca025 in ignore_sigpipe () at ./libmariadb/libmariadb/mariadb_lib.c:3842
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#5 mysql_once_init () at ./libmariadb/libmariadb/mariadb_lib.c:3898
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#6 mysql_once_init () at ./libmariadb/libmariadb/mariadb_lib.c:3851
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#7 0x00007ffff7e5b610 in __pthread_once_slow (once_control=0x7ffff78f7b6c <init_once>,
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init_routine=0x7ffff78c9fb0 <mysql_once_init>) at pthread_once.c:116
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#8 0x00007ffff7904f1d in ?? () from /usr/lib/x86_64-linux-gnu/perl5/5.34/auto/DBD/MariaDB/MariaDB.so
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#9 0x00007ffff7907f2c in ?? () from /usr/lib/x86_64-linux-gnu/perl5/5.34/auto/DBD/MariaDB/MariaDB.so
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#10 0x00007ffff7901ef0 in ?? () from /usr/lib/x86_64-linux-gnu/perl5/5.34/auto/DBD/MariaDB/MariaDB.so
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#11 0x0000555555667877 in Perl_pp_entersub ()
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#12 0x000055555565df36 in Perl_runops_standard ()
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#13 0x00005555555c1f9d in Perl_call_sv ()
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#14 0x00007ffff79310b9 in XS_DBI_dispatch () from /usr/lib/x86_64-linux-gnu/perl5/5.34/auto/DBI/DBI.so
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#15 0x0000555555667877 in Perl_pp_entersub ()
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#16 0x000055555565df36 in Perl_runops_standard ()
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#17 0x00005555555ca36c in perl_run ()
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#18 0x000055555559d4c2 in main ()
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I filed a bug with DBD::MariaDB first, but word there is that the C connector should not be ignoring SIGPIPE.
https://github.com/perl5-dbi/DBD-MariaDB/issues/170
It seems like this behavior must exist for an intended purpose, but I don't know what that would be. Even if there is a good reason to ignore SIGPIPE, it does have some undesired consequences.
Thanks,
Corey