dovecot - Dec 2018 - Dovecot 2.3.4 crashing on Solaris 10 - "Panic: output stream is missing error handling"

Hi,

I just compiled Dovecot for Solaris 10 and try to run it now. Other
than setting a custom port, I did not add custom settings. When I
tried running doveconf for the first time, it crashed immediately:

doveconf -n
# 2.3.4 (): /export/dovecot/etc/dovecot/dovecot.conf
# OS: SunOS 5.10 sun4u~~
# Hostname: merlin
service pop3-login {
  inet_listener pop3 {
    port = 1110
  }
}
submission_max_mail_size = 0
doveconf: Panic: output stream  is missing error handling
doveconf: Error: Raw backtrace: 0xff01b3a8 -> 0xff063b04 -> 0x1673c ->
0x1797c -> 0x14478
Abort (core dumped)

The same error appears when I run dovecot -F. Unfortunately I
currently don't have access to the core dumps (I might do later), but
I could run it with the Debugger with user process debugging enabled:

(This is the part when it crashes. I can provide the full output if requested)

truss -u "libdovecot" /export/dovecot/bin/doveconf -n

service pop3-login {
  inet_listener pop3 {
    port = 1110
  }
}
submission_max_mail_size = 0
/1:     write(1, " s e r v i c e   p o p 3".., 95)      = 95
/1 at 1:   <- libdovecot:o_stream_uncork() = 0xa1918
/1 at 1:   -> libdovecot:buffer_free(0xa1a10, 0x0, 0x0, 0x0)
/1 at 1:   -> libdovecot:pool_system_free(0xff0fb050, 0x4af10,
0xff0fb030, 0xff059470)
/1 at 1:   <- libdovecot:buffer_free() = 0
/1 at 1:   -> libdovecot:buffer_free(0xa1a18, 0x1c00, 0xfec47940, 0x0)
/1 at 1:   -> libdovecot:pool_system_free(0xff0fb050, 0x4af60,
0xff0fb030, 0xff059470)
/1 at 1:   <- libdovecot:buffer_free() = 0
/1 at 1:   -> libdovecot:pool_datastack_create(0xc3ed8, 0xc4200, 0x328, 0x0)
/1 at 1:   <- libdovecot:pool_datastack_create() = 0x42a58
/1 at 1:   -> libdovecot:buffer_create_dynamic(0x42a58, 0x20, 0x8000,
0xff0f44f4)
/1 at 1:   <- libdovecot:buffer_create_dynamic() = 0x42a68
/1 at 1:   -> libdovecot:buffer_append(0x42a68, 0x525c8, 0x4, 0x42a68)
/1 at 1:   -> libdovecot:buffer_write(0x42a68, 0x0, 0x525c8, 0x4)
/1 at 1:   <- libdovecot:buffer_append() = 0x42a88
/1 at 1:   -> libdovecot:array_sort_i(0xffbfec38, 0x1cd70, 0x0, 0x52830)
/1 at 1:   <- libdovecot:array_sort_i() = 0x42a88
/1 at 1:   -> libdovecot:buffer_append_space_unsafe(0x42a68, 0x4, 0x4,
0x1cd70)
/1 at 1:   -> libdovecot:buffer_get_space_unsafe(0x42a68, 0x4, 0x4, 0x1cd70)
/1 at 1:   <- libdovecot:buffer_append_space_unsafe() = 0x42a8c
/1 at 1:   -> libdovecot:o_stream_uncork(0xa1968, 0xffbfedb0, 0x0, 0x1)
/1 at 1:   <- libdovecot:o_stream_uncork() = 0xa1918
/1 at 1:   -> libdovecot:o_stream_destroy(0xffbfed3c, 0x0, 0x0, 0x1)
/1 at 1:   -> libdovecot:o_stream_unref(0xffbfed3c, 0x0, 0x0, 0x1)
doveconf: Panic: output stream  is missing error handling
/1:     write(2, " d o v e c o n f :   P a".., 58)      = 58
/1:     getcontext(0xFFBFE988)
/1:     open("/proc/self/as", O_RDONLY)                 = 8
/1:     fstat64(8, 0xFFBFE7B8)                          = 0
/1:     pread(8, "FFBFEB H", 4, 0xFFBFE958)             = 4
/1:     pread(8, "FF\0CBD0", 4, 0xFFBFE95C)             = 4
/1:     pread(8, "FFBFEBA8", 4, 0xFFBFEB80)             = 4
/1:     pread(8, "FF01B11C", 4, 0xFFBFEB84)             = 4
/1:     pread(8, "FFBFEC\b", 4, 0xFFBFEBE0)             = 4
/1:     pread(8, "FF01B3A8", 4, 0xFFBFEBE4)             = 4
/1:     pread(8, "FFBFEC80", 4, 0xFFBFEC40)             = 4
/1:     pread(8, "FF06 ;04", 4, 0xFFBFEC44)             = 4
/1:     pread(8, "FFBFECE0", 4, 0xFFBFECB8)             = 4
/1:     pread(8, "\001 g <", 4, 0xFFBFECBC)             = 4
/1:     pread(8, "FFBFED @", 4, 0xFFBFED18)             = 4
/1:     pread(8, "\001 y |", 4, 0xFFBFED1C)             = 4
/1:     pread(8, "FFBFEDF0", 4, 0xFFBFED78)             = 4
/1:     pread(8, "\001 D x", 4, 0xFFBFED7C)             = 4
/1:     pread(8, "\0\0\0\0", 4, 0xFFBFEE28)             = 4
/1:     pread(8, "\0\0\0\0", 4, 0xFFBFEE2C)             = 4
/1:     close(8)                                        = 0
doveconf: Error: Raw backtrace: 0xff01b3a8 -> 0xff063b04 -> 0x1673c ->
0x1797c -> 0x14478
/1:     write(2, " d o v e c o n f :   E r".., 90)      = 90
/1:     sigaction(SIGABRT, 0x00000000, 0xFFBFEB88)      = 0
/1:     sigaction(SIGABRT, 0xFFBFEA38, 0xFFBFEAD8)      = 0
/1:     lwp_sigmask(SIG_SETMASK, 0x00000000, 0x00000000) = 0xFFBFFEFF
[0x0000FFFF]
/1:     lwp_kill(1, SIGABRT)                            = 0
/1:         Received signal #6, SIGABRT [default]
/1:           siginfo: SIGABRT pid=25172 uid=0 code=-1

I have no idea about what that error means.

Thanks,
Fabian