Package: dovecot-core
Version: 1:2.3.4.1-5
Severity: normal
Tags: upstream

Hello,

After upgrading a server to buster, dovecot was upgraded to
1:2.3.4.1-5, and /usr/lib/dovecot/maildirlock now complains
that it did not get a timeout parameter (although I did pass
the argument).

How to reproduce:

Create a maildir somewhere.

$ /usr/lib/dovecot/maildirlock PATH_TO_MAILDIR 100
Panic: BUG: No IOs or timeouts set. Not waiting for infinity.
6169Error: Raw backtrace: /usr/lib/dovecot/libdovecot.so.0(+0xdb13b) 
[0x7fe73d3e313b] -> /usr/lib/dovecot/libdovecot.so.0(+0xdb171) [0x7fe73d3e3171] 
-> /usr/lib/dovecot/libdovecot.so.0(+0x4a001) [0x7fe73d352001] -> 
/usr/lib/dovecot/libdovecot.so.0(+0xf070c) [0x7fe73d3f870c] -> 
/usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x36) 
[0x7fe73d3faae6] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x4c) 
[0x7fe73d3f968c] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x40) 
[0x7fe73d3f97f0] -> /usr/lib/dovecot/maildirlock(main+0x1bd) [0x55761fb7741d] 
-> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb) [0x7fe73d0fc09b] -> 
/usr/lib/dovecot/maildirlock(_start+0x2a) [0x55761fb7752a]

The "6169" before the "Error" string is the PID of the program that
holds the lock.

I expected it to work as it did before the upgrade -- it would
only return the PID.

I also tried
$ /usr/lib/dovecot/maildirlock PATH_TO_MAILDIR 100

from two different terminals, at roughly the same time, and both
succeeded (I expected the second to have to wait before the first
one finished, after 100 seconds -- this was the behavior before
the upgrade).

Also triedon a sid box (same version), just to check if any different
libs would make a difference, but found the same bug.

maildirlock is documented in Dovecot's manual, in this page:
https://wiki2.dovecot.org/Plugins/Zlib

Thank you!
J.

-- Package-specific info:

dovecot configuration
---------------------
# 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.4 ()
# OS: Linux 4.19.0-5-amd64 x86_64 Debian bullseye/sid 
# Hostname: socrates.lan
mail_location = mbox:~/mail:INBOX=/var/mail/%u
mail_privileged_group = mail
namespace inbox {
  inbox = yes
  location = 
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix = 
}
passdb {
  driver = pam
}
ssl_cert = </etc/dovecot/private/dovecot.pem
ssl_client_ca_dir = /etc/ssl/certs
ssl_dh = # hidden, use -P to show it
ssl_key = # hidden, use -P to show it
userdb {
  driver = passwd
}

-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-5-amd64 (SMP w/8 CPU cores)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), 
LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages dovecot-core depends on:
ii  adduser              3.118
ii  libapparmor1         2.13.2-10
ii  libbz2-1.0           1.0.6-9.2
ii  libc6                2.28-10
ii  libexttextcat-2.0-0  3.4.5-1
ii  libicu63             63.1-4
ii  liblua5.3-0          5.3.3-1.1+b1
ii  liblz4-1             1.8.3-1
ii  liblzma5             5.2.2-1.3
ii  libpam-runtime       1.3.1-5
ii  libpam0g             1.3.1-5
ii  libsodium23          1.0.17-1
ii  libssl1.1            1.1.1c-1
ii  libstemmer0d         0+svn585-1+b2
ii  libwrap0             7.6.q-28
ii  lsb-base             10.2019051400
ii  openssl              1.1.1c-1
ii  ssl-cert             1.0.39
ii  ucf                  3.0038+nmu1
ii  zlib1g               1:1.2.11.dfsg-1

dovecot-core recommends no packages.

Versions of packages dovecot-core suggests:
pn  dovecot-gssapi        <none>
pn  dovecot-imapd         <none>
pn  dovecot-ldap          <none>
pn  dovecot-lmtpd         <none>
pn  dovecot-lucene        <none>
pn  dovecot-managesieved  <none>
pn  dovecot-mysql         <none>
pn  dovecot-pgsql         <none>
pn  dovecot-pop3d         <none>
pn  dovecot-sieve         <none>
pn  dovecot-solr          <none>
pn  dovecot-sqlite        <none>
pn  dovecot-submissiond   <none>
ii  ntp                   1:4.2.8p13+dfsg-2

Versions of packages dovecot-core is related to:
ii  dovecot-core [dovecot-common]  1:2.3.4.1-5
pn  dovecot-dev                    <none>
pn  dovecot-gssapi                 <none>
pn  dovecot-imapd                  <none>
pn  dovecot-ldap                   <none>
pn  dovecot-lmtpd                  <none>
pn  dovecot-managesieved           <none>
pn  dovecot-mysql                  <none>
pn  dovecot-pgsql                  <none>
pn  dovecot-pop3d                  <none>
pn  dovecot-sieve                  <none>
pn  dovecot-sqlite                 <none>

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