--- Begin Message ---
Hi !

First of all thanks for all your doing :)

I also have this kind of segfault since the update :

Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: *** Error in 
`dovecot/auth': double free or corruption (fasttop): 0x000055573bb99f70 ***
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: ======= Backtrace: 
=========
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 
/lib/x86_64-linux-gnu/libc.so.6(+0x70bfb)[0x7f961ab00bfb]
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 
/lib/x86_64-linux-gnu/libc.so.6(+0x76fc6)[0x7f961ab06fc6]
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 
/lib/x86_64-linux-gnu/libc.so.6(+0x7780e)[0x7f961ab0780e]
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 
/usr/lib/x86_64-linux-gnu/libmariadbclient.so.18(mysql_close+0x12f)[0x7f9619e0778f]
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 
dovecot/auth(+0x3f68c)[0x55573b84a68c]
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 
dovecot/auth(db_sql_unref+0x15)[0x55573b8400b5]
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 
dovecot/auth(userdb_deinit+0x99)[0x55573b8389d9]
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 
dovecot/auth(auths_deinit+0x79)[0x55573b81cc89]
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 
dovecot/auth(main+0x3d0)[0x55573b81b800]
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1)[0x7f961aab02e1]
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 
dovecot/auth(_start+0x2a)[0x55573b81ba0a]
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: ======= Memory map: 
========
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 55573b80b000-55573b865000 
r-xp 00000000 08:02 42337430                   /usr/lib/dovecot/auth
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 55573ba64000-55573ba67000 
r--p 00059000 08:02 42337430                   /usr/lib/dovecot/auth
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 55573ba67000-55573ba69000 
rw-p 0005c000 08:02 42337430                   /usr/lib/dovecot/auth
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 55573bb64000-55573bbaf000 
rw-p 00000000 00:00 0                          [heap]
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9614000000-7f9614021000 
rw-p 00000000 00:00 0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9614021000-7f9618000000 
---p 00000000 00:00 0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9618d98000-7f9618dae000 
r-xp 00000000 08:02 39714820                   
/lib/x86_64-linux-gnu/libgcc_s.so.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9618dae000-7f9618fad000 
---p 00016000 08:02 39714820                   
/lib/x86_64-linux-gnu/libgcc_s.so.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9618fad000-7f9618fae000 
r--p 00015000 08:02 39714820                   
/lib/x86_64-linux-gnu/libgcc_s.so.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9618fae000-7f9618faf000 
rw-p 00016000 08:02 39714820                   
/lib/x86_64-linux-gnu/libgcc_s.so.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9618faf000-7f9618fb9000 
r-xp 00000000 08:02 39714834                   
/lib/x86_64-linux-gnu/libnss_files-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9618fb9000-7f96191b9000 
---p 0000a000 08:02 39714834                   
/lib/x86_64-linux-gnu/libnss_files-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f96191b9000-7f96191ba000 
r--p 0000a000 08:02 39714834                   
/lib/x86_64-linux-gnu/libnss_files-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f96191ba000-7f96191bb000 
rw-p 0000b000 08:02 39714834                   
/lib/x86_64-linux-gnu/libnss_files-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f96191bb000-7f96191c1000 
rw-p 00000000 00:00 0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f96191c1000-7f961942b000 
r-xp 00000000 08:02 41813615                   
/usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961942b000-7f961962b000 
---p 0026a000 08:02 41813615                   
/usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961962b000-7f9619649000 
r--p 0026a000 08:02 41813615                   
/usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9619649000-7f9619657000 
rw-p 00288000 08:02 41813615                   
/usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9619657000-7f961965a000 
rw-p 00000000 00:00 0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961965a000-7f96196bd000 
r-xp 00000000 08:02 41814649                   
/usr/lib/x86_64-linux-gnu/libssl.so.1.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f96196bd000-7f96198bc000 
---p 00063000 08:02 41814649                   
/usr/lib/x86_64-linux-gnu/libssl.so.1.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f96198bc000-7f96198c0000 
r--p 00062000 08:02 41814649                   
/usr/lib/x86_64-linux-gnu/libssl.so.1.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f96198c0000-7f96198c6000 
rw-p 00066000 08:02 41814649                   
/usr/lib/x86_64-linux-gnu/libssl.so.1.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f96198c6000-7f96199c9000 
r-xp 00000000 08:02 39714828                   
/lib/x86_64-linux-gnu/libm-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f96199c9000-7f9619bc8000 
---p 00103000 08:02 39714828                   
/lib/x86_64-linux-gnu/libm-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9619bc8000-7f9619bc9000 
r--p 00102000 08:02 39714828                   
/lib/x86_64-linux-gnu/libm-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9619bc9000-7f9619bca000 
rw-p 00103000 08:02 39714828                   
/lib/x86_64-linux-gnu/libm-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9619bca000-7f9619be3000 
r-xp 00000000 08:02 39714906                   
/lib/x86_64-linux-gnu/libz.so.1.2.8
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9619be3000-7f9619de2000 
---p 00019000 08:02 39714906                   
/lib/x86_64-linux-gnu/libz.so.1.2.8
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9619de2000-7f9619de3000 
r--p 00018000 08:02 39714906                   
/lib/x86_64-linux-gnu/libz.so.1.2.8
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9619de3000-7f9619de4000 
rw-p 00019000 08:02 39714906                   
/lib/x86_64-linux-gnu/libz.so.1.2.8
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9619de4000-7f9619e30000 
r-xp 00000000 08:02 41812885                   
/usr/lib/x86_64-linux-gnu/libmariadb.so.3
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f9619e30000-7f961a02f000 
---p 0004c000 08:02 41812885                   
/usr/lib/x86_64-linux-gnu/libmariadb.so.3
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a02f000-7f961a037000 
r--p 0004b000 08:02 41812885                   
/usr/lib/x86_64-linux-gnu/libmariadb.so.3
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a037000-7f961a039000 
rw-p 00053000 08:02 41812885                   
/usr/lib/x86_64-linux-gnu/libmariadb.so.3
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a039000-7f961a03b000 
rw-p 00000000 00:00 0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a03b000-7f961a040000 
r-xp 00000000 08:02 42338096                   
/usr/lib/dovecot/modules/libdriver_mysql.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a040000-7f961a23f000 
---p 00005000 08:02 42338096                   
/usr/lib/dovecot/modules/libdriver_mysql.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a23f000-7f961a240000 
r--p 00004000 08:02 42338096                   
/usr/lib/dovecot/modules/libdriver_mysql.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a240000-7f961a241000 
rw-p 00005000 08:02 42338096                   
/usr/lib/dovecot/modules/libdriver_mysql.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a241000-7f961a243000 
r-xp 00000000 08:02 42339885                   
/usr/lib/dovecot/modules/auth/lib20_auth_var_expand_crypt.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a243000-7f961a443000 
---p 00002000 08:02 42339885                   
/usr/lib/dovecot/modules/auth/lib20_auth_var_expand_crypt.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a443000-7f961a444000 
r--p 00002000 08:02 42339885                   
/usr/lib/dovecot/modules/auth/lib20_auth_var_expand_crypt.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a444000-7f961a445000 
rw-p 00003000 08:02 42339885                   
/usr/lib/dovecot/modules/auth/lib20_auth_var_expand_crypt.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a445000-7f961a449000 
r-xp 00000000 08:02 39714874                   
/lib/x86_64-linux-gnu/libcap-ng.so.0.0.0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a449000-7f961a649000 
---p 00004000 08:02 39714874                   
/lib/x86_64-linux-gnu/libcap-ng.so.0.0.0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a649000-7f961a64a000 
r--p 00004000 08:02 39714874                   
/lib/x86_64-linux-gnu/libcap-ng.so.0.0.0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a64a000-7f961a64b000 
rw-p 00005000 08:02 39714874                   
/lib/x86_64-linux-gnu/libcap-ng.so.0.0.0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a64b000-7f961a663000 
r-xp 00000000 08:02 39714839                   
/lib/x86_64-linux-gnu/libpthread-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a663000-7f961a862000 
---p 00018000 08:02 39714839                   
/lib/x86_64-linux-gnu/libpthread-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a862000-7f961a863000 
r--p 00017000 08:02 39714839                   
/lib/x86_64-linux-gnu/libpthread-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a863000-7f961a864000 
rw-p 00018000 08:02 39714839                   
/lib/x86_64-linux-gnu/libpthread-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a864000-7f961a868000 
rw-p 00000000 00:00 0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a868000-7f961a885000 
r-xp 00000000 08:02 39714877                   
/lib/x86_64-linux-gnu/libaudit.so.1.0.0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961a885000-7f961aa84000 
---p 0001d000 08:02 39714877                   
/lib/x86_64-linux-gnu/libaudit.so.1.0.0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961aa84000-7f961aa85000 
r--p 0001c000 08:02 39714877                   
/lib/x86_64-linux-gnu/libaudit.so.1.0.0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961aa85000-7f961aa86000 
rw-p 0001d000 08:02 39714877                   
/lib/x86_64-linux-gnu/libaudit.so.1.0.0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961aa86000-7f961aa90000 
rw-p 00000000 00:00 0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961aa90000-7f961ac25000 
r-xp 00000000 08:02 39714824                   
/lib/x86_64-linux-gnu/libc-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961ac25000-7f961ae25000 
---p 00195000 08:02 39714824                   
/lib/x86_64-linux-gnu/libc-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961ae25000-7f961ae29000 
r--p 00195000 08:02 39714824                   
/lib/x86_64-linux-gnu/libc-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961ae29000-7f961ae2b000 
rw-p 00199000 08:02 39714824                   
/lib/x86_64-linux-gnu/libc-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961ae2b000-7f961ae2f000 
rw-p 00000000 00:00 0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961ae2f000-7f961ae93000 
r-xp 00000000 08:02 41813682                   
/usr/lib/x86_64-linux-gnu/libsodium.so.18.1.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961ae93000-7f961b093000 
---p 00064000 08:02 41813682                   
/usr/lib/x86_64-linux-gnu/libsodium.so.18.1.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961b093000-7f961b094000 
r--p 00064000 08:02 41813682                   
/usr/lib/x86_64-linux-gnu/libsodium.so.18.1.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961b094000-7f961b095000 
rw-p 00065000 08:02 41813682                   
/usr/lib/x86_64-linux-gnu/libsodium.so.18.1.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961b095000-7f961b0a2000 
r-xp 00000000 08:02 39714879                   
/lib/x86_64-linux-gnu/libpam.so.0.83.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961b0a2000-7f961b2a1000 
---p 0000d000 08:02 39714879                   
/lib/x86_64-linux-gnu/libpam.so.0.83.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961b2a1000-7f961b2a2000 
r--p 0000c000 08:02 39714879                   
/lib/x86_64-linux-gnu/libpam.so.0.83.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961b2a2000-7f961b2a3000 
rw-p 0000d000 08:02 39714879                   
/lib/x86_64-linux-gnu/libpam.so.0.83.1
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961b2a3000-7f961b2ab000 
r-xp 00000000 08:02 39714826                   
/lib/x86_64-linux-gnu/libcrypt-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961b2ab000-7f961b4ab000 
---p 00008000 08:02 39714826                   
/lib/x86_64-linux-gnu/libcrypt-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961b4ab000-7f961b4ac000 
r--p 00008000 08:02 39714826                   
/lib/x86_64-linux-gnu/libcrypt-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961b4ac000-7f961b4ad000 
rw-p 00009000 08:02 39714826                   
/lib/x86_64-linux-gnu/libcrypt-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961b4ad000-7f961b4db000 
rw-p 00000000 00:00 0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961b4db000-7f961b4de000 
r-xp 00000000 08:02 39714827                   
/lib/x86_64-linux-gnu/libdl-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961b4de000-7f961b6dd000 
---p 00003000 08:02 39714827                   
/lib/x86_64-linux-gnu/libdl-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961b6dd000-7f961b6de000 
r--p 00002000 08:02 39714827                   
/lib/x86_64-linux-gnu/libdl-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961b6de000-7f961b6df000 
rw-p 00003000 08:02 39714827                   
/lib/x86_64-linux-gnu/libdl-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961b6df000-7f961b859000 
r-xp 00000000 08:02 42339882                   
/usr/lib/dovecot/libdovecot.so.0.0.0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961b859000-7f961ba58000 
---p 0017a000 08:02 42339882                   
/usr/lib/dovecot/libdovecot.so.0.0.0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961ba58000-7f961ba60000 
r--p 00179000 08:02 42339882                   
/usr/lib/dovecot/libdovecot.so.0.0.0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961ba60000-7f961ba61000 
rw-p 00181000 08:02 42339882                   
/usr/lib/dovecot/libdovecot.so.0.0.0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961ba61000-7f961ba64000 
rw-p 00000000 00:00 0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961ba64000-7f961ba65000 
r-xp 00000000 08:02 42339932                   
/usr/lib/dovecot/modules/old-stats/libstats_auth.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961ba65000-7f961bc65000 
---p 00001000 08:02 42339932                   
/usr/lib/dovecot/modules/old-stats/libstats_auth.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961bc65000-7f961bc66000 
r--p 00001000 08:02 42339932                   
/usr/lib/dovecot/modules/old-stats/libstats_auth.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961bc66000-7f961bc67000 
rw-p 00002000 08:02 42339932                   
/usr/lib/dovecot/modules/old-stats/libstats_auth.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961bc67000-7f961bc8a000 
r-xp 00000000 08:02 39714819                   /lib/x86_64-linux-gnu/ld-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961be7c000-7f961be80000 
rw-p 00000000 00:00 0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961be86000-7f961be8a000 
rw-p 00000000 00:00 0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961be8a000-7f961be8b000 
r--p 00023000 08:02 39714819                   /lib/x86_64-linux-gnu/ld-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961be8b000-7f961be8c000 
rw-p 00024000 08:02 39714819                   /lib/x86_64-linux-gnu/ld-2.24.so
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7f961be8c000-7f961be8d000 
rw-p 00000000 00:00 0
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7ffd36629000-7ffd3664a000 
rw-p 00000000 00:00 0                          [stack]
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7ffd36773000-7ffd36775000 
r--p 00000000 00:00 0                          [vvar]
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 7ffd36775000-7ffd36777000 
r-xp 00000000 00:00 0                          [vdso]
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Error: 
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  
[vsyscall]
Dec  2 21:12:11 xxxxxxx dovecot: auth-worker: Fatal: master: 
service(auth-worker): child 26350 killed with signal 6 (core dumped)


dovecot -n
# 2.3.4 (0ecbaf23d): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.4 (60b0f48d)
# OS: Linux 4.9.0-8-amd64 x86_64 Debian 9.6 
auth_mechanisms = plain login
mail_gid = 5000
mail_plugins = quota
mail_uid = 5000
mail_vsize_bg_after_count = 100
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character 
vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy 
include variables body enotify environment mailbox date index ihave duplicate 
mime foreverypart extracttext imapsieve vnd.dovecot.imapsieve
namespace inbox {
  inbox = yes
  location = 
  mailbox Archive {
    auto = subscribe
    special_use = \Archive
  }
  mailbox Drafts {
    auto = subscribe
    special_use = \Drafts
  }
  mailbox Junk {
    auto = subscribe
    autoexpunge = 90 days
    special_use = \Junk
  }
  mailbox Sent {
    auto = subscribe
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    auto = no
    special_use = \Sent
  }
  mailbox Spam {
    auto = no
    special_use = \Junk
  }
  mailbox Trash {    auto = subscribe
    autoexpunge = 90 days
    special_use = \Trash
  }
  prefix = 
}
passdb {
  args = /etc/dovecot/dovecot-sql.conf
  driver = sql
}
plugin {
  imapsieve_mailbox1_before = file:/etc/dovecot/sieve/report-spam.sieve
  imapsieve_mailbox1_causes = COPY
  imapsieve_mailbox1_name = Junk
  imapsieve_mailbox2_before = file:/etc/dovecot/sieve/report-ham.sieve
  imapsieve_mailbox2_causes = COPY
  imapsieve_mailbox2_from = Junk
  imapsieve_mailbox2_name = *
  quota = count:User quota
  quota_grace = 50M
  quota_rule = *:storage=2G
  quota_status_nouser = DUNNO
  quota_status_overquota = 552 5.2.2 Mailbox is full
  quota_status_success = DUNNO
  quota_vsizes = yes
  quota_warning = storage=95%% quota-warning 95 %u
  sieve_after = /etc/dovecot/sieve-after
  sieve_global_extensions = +vnd.dovecot.pipe +vnd.dovecot.environment
  sieve_pipe_bin_dir = /etc/dovecot/sieve
  sieve_plugins = sieve_imapsieve sieve_extprograms
}
protocols = imap pop3 lmtp sieve
service auth-worker {
  chroot = 
  user = root
}
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
  unix_listener auth-userdb {
    mode = 0660
  }
}
service imap-login {
  inet_listener imap {
    address = 127.0.0.1, ::1
    port = 143
  }
  inet_listener imaps {
    address = XXXX
    port = 993
  }
}
service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0660
    user = postfix
  }
}
service managesieve-login {
  inet_listener sieve {
    address = XXXX
    port = 4190
  }
  service_count = 1
}
service pop3-login {
  inet_listener pop3 {
    port = 0
  }
  inet_listener pop3s {
    address = XXXXX
    port = 995
  }
}
service quota-status {
  client_limit = 1
  executable = quota-status -p postfix
  unix_listener /var/spool/postfix/private/quota-status {
    group = postfix
    mode = 0660
    user = postfix
  }
}
service quota-warning {
  executable = script /etc/dovecot/quota-warning.sh
  user = dovecot
}
ssl = required
ssl_cert = </etc/letsencrypt/live/XXX/fullchain.pem
ssl_dh = # hidden, use -P to show it
ssl_key = # hidden, use -P to show it
userdb {
  args = /etc/dovecot/dovecot-sql.conf
  driver = sql
}
protocol imap {
  mail_plugins = quota imap_quota imap_sieve
}
protocol lmtp {
  mail_plugins = quota sieve
  postmaster_address = postmas...@xxxxxx.xx
}

How can I send the core dump ?

Best regards,
Guillaume 



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