Dear Dovecot Users,

Upgrading from Dovecot 2.3.14 to 2.3.18 on Arch gives me the following dump immediately (100% of the time) on every LMTP handler invocation. Of course I'm using Squat for FTS (yes, I understand it's deprecated...).

plugin {
        fts = squat
        fts_squat = partial=4 full=4
        fts_autoindex = yes
sieve = file:/mnt/mail/%Ln/sieve;active=/mnt/mail/%Ln/.dovecot.sieve
        master_user = %u
}


lmtp[592878]: segfault at 50 ip 00007f5355153eed sp 00007fff45b87ba0 error 4 in lib20_fts_plugin.so[7f5355153000+11000]

Code: 00 4c 8d 05 f9 17 01 00 48 8d 0d ae 19 01 00 31 c0 ba 53 01 00 00 48 8d 35 f2 17 01 00 48 8d 3d 49 01 01 00 ff 15 53 7f 03 00 <48> 8b 04 25 50 00 00 00 0f 0b be 2a 01 00 00 8d 3d cf 17 01 00

Feb 08 01:23:20 mail systemd-coredump[592880]: [🡕] Process 592878 (lmtp) of 
user 0 dumped core.
Module linux-vdso.so.1 with build-id 0f9bd6468a3798a863048e6cd927830796809b46 Module libffi.so.8 with build-id f90d8b734f6de9b25faedb8cbfab7054dafc0a42 Module libp11-kit.so.0 with build-id cc372ea3c28c4d3dfc633b4d2e933c8584d2af16 Module libcrypt.so.2 with build-id 5d45bdae438c16d52364b23d70bd5041ad070b0b Module librt.so.1 with build-id 75484da2d6f1515189eefa076e0a40328834cd16 Module libnss_systemd.so.2 with build-id 56da60140e2f0e47044a141378608146f6fd9bb8
                                               Module libnss_files.so.2 with 
build-id 1a36dfc01d3a1010b2ee79766a24a8090a3266d5
Module libdovecot-sieve.so.0 with build-id a358da532b8ef09782b5a97a951df8ab5c8eb0db Module lib90_sieve_plugin.so with build-id eb52835c5c3d1034617e745995b950484faed909
                                               Module lib21_fts_squat_plugin.so 
with build-id cc731fa9bf9cac2f890bbc1da598e958cb465d52
                                               Module libicudata.so.70 with 
build-id e1dcc2a88cfaafed882d09c90c668af0eed4efed
                                               Module libgcc_s.so.1 with 
build-id 7f8508bb914546ada778809b64b99d234337d835
                                               Module libm.so.6 with build-id 
2b8fd1f869ecab4e0b55e92f2f151897f6818acf
                                               Module libstdc++.so.6 with 
build-id 9b5eeeb149bf3c4efe787fb398b44f00507aec87
                                               Module libicuuc.so.70 with 
build-id 2e245c2bf12f95fd8ab79b3a4be99524677cbd70
                                               Module libicui18n.so.70 with 
build-id 95af755fca990df26753a7d720b8e3ae24270e42
Module lib20_fts_plugin.so with build-id 5b44deef3cd93f2cdac9a38ab3f5c4f1a2f48d40 Module lib10_quota_plugin.so with build-id 5fa33175575dcf45f4aead56c701fe58a19f0df8 Module libpthread.so.0 with build-id 07c8f95b4f3251d08550217ad8a1f31066229996 Module libcrypto.so.1.1 with build-id 4c926b672d97886b123e03a008387aecf0786de4 Module libssl.so.1.1 with build-id 1024424ab33a3767da03f4fdb1fc1b02479f160f Module libssl_iostream_openssl.so with build-id ba2cf9015fbabf8459896bd584379f2f566aaa51 Module ld-linux-x86-64.so.2 with build-id 040cc3dd10461562f177df39e3be2f3704258c3c Module libdl.so.2 with build-id 5abc547e7b0949f89f3c0e21ab0c8331a7440a8a
                                               Module libc.so.6 with build-id 
4b406737057708c0e4c642345a703c47a61c73dc
Module libdovecot.so.0 with build-id 3f68ab1f1e0bffceea1c130e6b46f799eea45522 Module libdovecot-storage.so.0 with build-id 3bf1e7c355c0c6184165e209f67b3a6627355401
                                               Module libdovecot-lda.so.0 with 
build-id 54cc9d9face18809a95ccd5ee643330eed997d8b
                                               Module lmtp with build-id 
7cc9238bb78e35771572aa3e31bdecf1cda5d754
                                               Stack trace of thread 592878:
                                               #0  0x00007f5355153eed n/a 
(lib20_fts_plugin.so + 0x9eed)
                                               #1  0x00007f535515db30 
fts_mailbox_allocated (lib20_fts_plugin.so + 0x13b30)
                                               #2  0x00007f535595eb6d 
hook_mailbox_allocated (libdovecot-storage.so.0 + 0x60b6d)
                                               #3  0x00007f53559598ec 
mailbox_alloc (libdovecot-storage.so.0 + 0x5b8ec)
                                               #4  0x00007f5355959b5e 
mailbox_alloc_for_user (libdovecot-storage.so.0 + 0x5bb5e)
                                               #5  0x00007f5355a6d790 
mail_deliver_save_open (libdovecot-lda.so.0 + 0x4790)
                                               #6  0x00007f5355a6dbdc 
mail_deliver_save (libdovecot-lda.so.0 + 0x4bdc)
                                               #7  0x00007f5355a6e39a 
mail_deliver (libdovecot-lda.so.0 + 0x539a)
                                               #8  0x0000563d3a90bc2d 
lmtp_local_default_deliver (lmtp + 0x8c2d)
                                               #9  0x0000563d3a90c39f 
lmtp_local_data (lmtp + 0x939f)
                                               #10 0x0000563d3a90acc1 
client_default_cmd_data (lmtp + 0x7cc1)
                                               #11 0x0000563d3a90aa31 
cmd_data_continue (lmtp + 0x7a31)
                                               #12 0x00007f535579c3bf n/a 
(libdovecot.so.0 + 0x6d3bf)
                                               #13 0x00007f535579cc46 n/a 
(libdovecot.so.0 + 0x6dc46)
                                               #14 0x00007f53557a023e 
smtp_server_command_call_hooks (libdovecot.so.0 + 0x7123e)
                                               #15 0x00007f53557a07f1 
smtp_server_command_next_to_reply (libdovecot.so.0 + 0x717f1)
                                               #16 0x00007f53557a5b5b n/a 
(libdovecot.so.0 + 0x76b5b)
                                               #17 0x00007f535584469f 
io_loop_call_io (libdovecot.so.0 + 0x11569f)
                                               #18 0x00007f5355844787 
io_loop_handler_run (libdovecot.so.0 + 0x115787)
                                               #19 0x00007f5355844919 
io_loop_run (libdovecot.so.0 + 0x115919)
                                               #20 0x00007f53557b31d8 
master_service_run (libdovecot.so.0 + 0x841d8)
                                               #21 0x0000563d3a909606 main 
(lmtp + 0x6606)
                                               #22 0x00007f535557bb25 
__libc_start_main (libc.so.6 + 0x27b25)

Thanks,
Bryan Jacobs

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