Hi Timo,
i'm not programmer at all but here is my understanding of the problem:
In src/imap/imap-client-hibernate.c, the code serializes peer_dev_major and
peer_dev_minor using major() and minor() macros:
str_printfa(cmd, "\tpeer_dev_major=%lu\tpeer_dev_minor=%lu\tpeer_ino=%llu",
(unsigned long)major(peer_st.st_dev),
(unsigned long)minor(peer_st.st_dev),
(unsigned long long)peer_st.st_ino);
On FreeBSD, major() and minor() can return UINT64_MAX (18446744073709551615)
for file descriptors that are not block/character devices (such as sockets on
tmpfs/devfs). This value exceeds UINT_MAX and cannot be parsed by str_to_uint()
in imap-master-client.c, causing hibernation to fail.
On 25 Jun 2026, at 14:37, Jordan Ostrev <[email protected]> wrote:
Hi Timo,
I've made freebsd port patch which looks like that:
# cat files/patch-configure.ac
--- configure.ac.orig 2026-06-25 11:03:42 UTC
+++ configure.ac
@@ -363,7 +363,7 @@ AS_CASE(
DOVECOT_IOLOOP
DOVECOT_NOTIFY
AS_CASE(
- ["$notify"],
+ ["$have_notify"],
[none], [BUILD_IMAP_HIBERNATE=0],
[kqueue], [BUILD_IMAP_HIBERNATE=0],
[BUILD_IMAP_HIBERNATE=1])
I'm simulating the situation with telnet:
c idle
+ idling
* 4228 EXPUNGE
* 0 RECENT
* OK Still here
* OK Still here
* 4228 EXISTS
* 1 RECENT
* 4228 EXPUNGE
* 0 RECENT
* 4228 EXISTS
* 1 RECENT
* 4228 EXPUNGE
* 0 RECENT
* OK Still here
* OK Still here
* OK Still here
* OK Still here
* 4228 EXISTS
* 1 RECENT
* 4228 EXPUNGE
* 0 RECENT
* OK Still here
* OK Still here
d idle
c BAD Idle completed.
+ idling
* OK Still here
* 4228 EXISTS
* 1 RECENT
* 4228 EXPUNGE
* 0 RECENT
* OK Still here
* 4228 EXISTS
* 4227 FETCH (FLAGS (\Seen $NotJunk NotJunk))
* 4228 EXPUNGE
* OK Still here
in the log I see following:
Jun 25 14:21:17 classic dovecot[29292]: imap-hibernate: Error: conn
unix:imap-hibernate (uid=125): Failed to parse client input: Invalid
peer_dev_major value: 18446744073709551615
Jun 25 14:21:17 classic dovecot[29292]:
imap([email protected])<29454><CLP/EhJVqIguCt00>: Error: Couldn't
hibernate imap client: /var/run/dovecot/imap-hibernate returned failure:
Failed to parse client input: Invalid peer_dev_major value:
18446744073709551615
Jun 25 14:21:17 classic dovecot[29292]: imap-hibernate: Error: conn
unix:imap-hibernate (uid=125): Failed to parse client input: Invalid
peer_dev_major value: 18446744073709551615
Jun 25 14:21:17 classic dovecot[29292]:
imap([email protected])<30943><EJZELRJVp5QuCt00>: Error: Couldn't
hibernate imap client: /var/run/dovecot/imap-hibernate returned failure:
Failed to parse client input: Invalid peer_dev_major value:
18446744073709551615
Jun 25 14:26:03 classic dovecot[29292]: imap-hibernate: Error: conn
unix:imap-hibernate (uid=125): Failed to parse client input: Invalid
peer_dev_major value: 18446744073709551615
Jun 25 14:26:03 classic dovecot[29292]:
imap([email protected])<30943><EJZELRJVp5QuCt00>: Error: Couldn't
hibernate imap client: /var/run/dovecot/imap-hibernate returned failure:
Failed to parse client input: Invalid peer_dev_major value:
18446744073709551615
Jun 25 14:26:03 classic dovecot[29292]: imap-hibernate: Error: conn
unix:imap-hibernate (uid=125): Failed to parse client input: Invalid
peer_dev_major value: 18446744073709551615
Jun 25 14:26:03 classic dovecot[29292]:
imap([email protected])<29454><CLP/EhJVqIguCt00>: Error: Couldn't
hibernate imap client: /var/run/dovecot/imap-hibernate returned failure:
Failed to parse client input: Invalid peer_dev_major value:
18446744073709551615
Jun 25 14:29:28 classic dovecot[29292]: imap-hibernate: Error: conn
unix:imap-hibernate (uid=125): Failed to parse client input: Invalid
peer_dev_major value: 18446744073709551615
Jun 25 14:29:28 classic dovecot[29292]:
imap([email protected])<29454><CLP/EhJVqIguCt00>: Error: Couldn't
hibernate imap client: /var/run/dovecot/imap-hibernate returned failure:
Failed to parse client input: Invalid peer_dev_major value:
18446744073709551615
Jun 25 14:33:36 classic dovecot[29292]: imap-hibernate: Error: conn
unix:imap-hibernate (uid=125): Failed to parse client input: Invalid
peer_dev_major value: 18446744073709551615
Jun 25 14:33:36 classic dovecot[29292]:
imap([email protected])<33114><cX5QWRJVrZguCt00>: Error: Couldn't
hibernate imap client: /var/run/dovecot/imap-hibernate returned failure:
Failed to parse client input: Invalid peer_dev_major value:
18446744073709551615
Jun 25 14:33:37 classic dovecot[29292]: imap-hibernate: Error: conn
unix:imap-hibernate (uid=125): Failed to parse client input: Invalid
peer_dev_major value: 18446744073709551615
Jun 25 14:33:37 classic dovecot[29292]:
imap([email protected])<33112><NlVOWRJVkbEuCt00>: Error: Couldn't
hibernate imap client: /var/run/dovecot/imap-hibernate returned failure:
Failed to parse client input: Invalid peer_dev_major value:
18446744073709551615
Jun 25 14:34:40 classic dovecot[29292]: imap-hibernate: Error: conn
unix:imap-hibernate (uid=125): Failed to parse client input: Invalid
peer_dev_major value: 18446744073709551615
Jun 25 14:34:40 classic dovecot[29292]:
imap([email protected])<33112><NlVOWRJVkbEuCt00>: Error: Couldn't
hibernate imap client: /var/run/dovecot/imap-hibernate returned failure:
Failed to parse client input: Invalid peer_dev_major value:
18446744073709551615
Here is my piece of my config:
# dovecot -a | grep hibernate
imap_hibernate_timeout = 1 mins
service imap-hibernate {
unix_listener imap-hibernate {
What we can do more?
KR,
Jordan
On 25 Jun 2026, at 12:34, Timo Sirainen <[email protected]> wrote:
On 24. Jun 2026, at 21.34, Jordan Ostrev via dovecot
<[email protected]> wrote:
Hi,
IMAP hibernation compiles and attempts to run on FreeBSD 15.x
(tested with
Dovecot 2.4.4 and FreeBSD 15.1), but fails at runtime with:
plain
imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to
parse client input: Invalid peer_dev_major value:
18446744073709551615
Jun 24 21:27:08 classic dovecot[36888]: imap-hibernate: Error: conn
unix:imap-hibernate (uid=125): Failed to parse client input: Invalid
peer_dev_major value: 18446744073709551615
Jun 24 21:27:08 classic dovecot[36888]:
imap([email protected])<37120><ExaV/gNVAdt/AAAB>: Error: Couldn't
hibernate imap client: /var/run/dovecot/imap-hibernate returned
failure: Failed to parse client input: Invalid peer_dev_major value:
18446744073709551615
..
1. Disable hibernation at compile time for kqueue systems, or
It was already supposed to be done, but looks like there's a bug. Can
you verify if this works? :
diff --git a/configure.ac b/configure.ac
index 9beacaa299..04f9c8edd6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -363,7 +363,7 @@ DOVECOT_TYPEOF
DOVECOT_IOLOOP
DOVECOT_NOTIFY
AS_CASE(
- ["$notify"],
+ ["$have_notify"],
[none], [BUILD_IMAP_HIBERNATE=0],
[kqueue], [BUILD_IMAP_HIBERNATE=0],
[BUILD_IMAP_HIBERNATE=1])
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