This shows up as a Valgrind warning

18197 Warning: invalid file descriptor -1 in syscall close()
18197 at 0x5F6E5BD: ??? (syscall-template.S:84)
18197 by 0xF95F34: inline_mysql_socket_close (mysql_socket.h:1090)
18197 by 0xF96AF3: vio_shutdown (viosocket.c:490)
18197 by 0x7C6BE0: THD::disconnect() (sql_class.cc:2057)
18197 by 0x637486: close_connection(THD*, unsigned int) (mysqld.cc:2886)
18197 by 0x7D63E3: do_handle_one_connection(THD*) (sql_connect.cc:1547)
18197 by 0x7D5E57: handle_one_connection (sql_connect.cc:1444)
18197 by 0xB98416: pfs_spawn_thread (pfs.cc:1860)
18197 by 0x5F656F9: start_thread (pthread_create.c:333)
18197 by 0x6B22B5C: clone (clone.S:109)

Then I try to close the connection with ldapunbindext. This goes according to the return value ok, but when running in valgrind I see a Warning: invalid file descriptor -1 in syscall close 4733 Warning: invalid file descriptor -1 in syscall close 4733 at 0x40007F2: (within /lib/ld-2.9.so). Re: Valgrind-users invalid file descriptor -1 in syscall close Re: Valgrind-users invalid file descriptor -1 in syscall close From: Nicholas Nethercote - 2005-08-11 13:34:59. .Valgrind is a runtime analysis tool, unlike cppcheckparasoft here you must run the buggy code in order to detect issues.If you are using other libraries, Valgrind will warn you about issues found there, errors you might not able to, or don’t want to fix.

on e.g.

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rpl.rpl_semi_sync_shutdown_hang 'mix' [ fail ] Found warnings/errors in server log file!
rpl.rpl_gtid_mts_relay_log_recovery_auto_pos_on_off 'mix' w3 [ fail ] Found warnings/errors in server log file!
rpl.rpl_report_port 'mix' w1 [ fail ] Found warnings/errors in server log file!
rpl.rpl_recovery_replicate_same_server_id 'mix' w4 [ fail ] Found warnings/errors in server log file!
rpl.rpl_change_master_crash_safe 'mix' w2 [ fail ] Found warnings/errors in server log file!
rpl.rpl_change_master 'mix' w1 [ fail ] Found warnings/errors in server log file!
rpl.rpl_alter_repository 'mix' w3 [ fail ] Found warnings/errors in server log file!
rpl.rpl_gtid_deployment_step 'mix' w1 [ fail ] Found warnings/errors in server log file!
rpl.rpl_recovery_replicate_same_server_id 'row' w4 [ fail ] Found warnings/errors in server log file!
main.mysql_client_test w4 [ fail ] Found warnings/errors in server log file!
auth_sec.mysql_native_plugin w3 [ fail ] Found warnings/errors in server log file!

The reason is that THD::disconnect is getting called twice, once from server thread-killing thread:
kill_server_threads -> kill_server -> close_connections -> close_connection -> THD::disconnect;
and the second time from the query thread itself, as in the above stacktrace.

Package: qbittorrent;Maintainer for qbittorrent is Cristian Greco <cristian@debian.org>; Source for qbittorrent is src:qbittorrent (PTS, buildd, popcon).

Reported by: qbittorrent <qbitt@safetymail.info>

Date: Sun, 17 Feb 2013 04:33:02 UTC

Severity: important

Tags: upstream

Found in version qbittorrent/2.9.8-1

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View this report as an mbox folder, status mbox, maintainer mbox

Report forwardedto debian-bugs-dist@lists.debian.org, qbitt@safetymail.info, Cristian Greco <cristian@debian.org>:
Bug#700764; Package qbittorrent. (Sun, 17 Feb 2013 04:33:04 GMT) (full text, mbox, link).

Acknowledgement sentto qbittorrent <qbitt@safetymail.info>:
New Bug report received and forwarded. Copy sent to qbitt@safetymail.info, Cristian Greco <cristian@debian.org>. (Sun, 17 Feb 2013 04:33:04 GMT) (full text, mbox, link).

Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: qbittorrent crashes without user interaction

Information forwardedto debian-bugs-dist@lists.debian.org, Cristian Greco <cristian@debian.org>:
Bug#700764; Package qbittorrent. (Sat, 19 Oct 2013 14:54:05 GMT) (full text, mbox, link).

Acknowledgement sentto sledgehammer999 <sledgehammer999@qbittorrent.org>:
Extra info received and forwarded to list. Copy sent to Cristian Greco <cristian@debian.org>. (Sat, 19 Oct 2013 14:54:05 GMT) (full text, mbox, link).

Message #10 received at 700764@bugs.debian.org (full text, mbox, reply):

Valgrind Invalid File Descriptor In Syscall Closed

From: sledgehammer999 <sledgehammer999@qbittorrent.org>

Subject: This is a libtorrent bug

Information forwardedto debian-bugs-dist@lists.debian.org, andrew@soltech.net.au, Cristian Greco <cristian@debian.org>:
Bug#700764; Package qbittorrent. (Sun, 08 Mar 2015 06:03:05 GMT) (full text, mbox, link).

Acknowledgement sentto Andrew <andrew@soltech.net.au>:
Extra info received and forwarded to list. Copy sent to andrew@soltech.net.au, Cristian Greco <cristian@debian.org>. (Sun, 08 Mar 2015 06:03:05 GMT) (full text, mbox, link).

Message #15 received at 700764@bugs.debian.org (full text, mbox, reply):

To: Debian Bug Tracking System <700764@bugs.debian.org>

Subject: Re: qbittorrent crashes without user interaction

Send a report that this bug log contains spam.

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Valgrind Invalid File Descriptor In Syscall Close

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