The SASL is cyrus-sasl 2.1.26-9.5. I believe it does use /dev/urandom.
I am not sure how to run strace on the process that the Master listener
forks. Here is the strace run on the imapd process at a command prompt
(which is not quite the same as the master listener forking it to a port
where another process is waiting to connect to it).
MAILSERVER:~ # strace /usr/lib/cyrus/bin/imapd -C
/etc/imapd.domain1.com.conf
execve("/usr/lib/cyrus/bin/imapd", ["/usr/lib/cyrus/bin/imapd", "-C",
"/etc/imapd.domain1.com.conf"], [/* 56 vars */]) = 0
brk(0) = 0x5573deaf5000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7fdeb770c000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or
directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=80522, ...}) = 0
mmap(NULL, 80522, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fdeb76f8000
close(3) = 0
open("/usr/lib64/libsasl2.so.3", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300N\0\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=118552, ...}) = 0
mmap(NULL, 2213800, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fdeb72d0000
mprotect(0x7fdeb72ec000, 2093056, PROT_NONE) = 0
mmap(0x7fdeb74eb000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1b000) = 0x7fdeb74eb000
close(3) = 0
open("/usr/lib64/libkrb5.so.3", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\200Y\2\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=855280, ...}) = 0
mmap(NULL, 2951008, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fdeb6fff000
mprotect(0x7fdeb70c1000, 2093056, PROT_NONE) = 0
mmap(0x7fdeb72c0000, 65536, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xc1000) = 0x7fdeb72c0000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7fdeb76f7000
open("/lib64/libcom_err.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340\26\0\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=14760, ...}) = 0
mmap(NULL, 2109928, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fdeb6dfb000
mprotect(0x7fdeb6dfe000, 2093056, PROT_NONE) = 0
mmap(0x7fdeb6ffd000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7fdeb6ffd000
close(3) = 0
open("/lib64/libssl.so.1.0.0", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0pr\1\0\0\0\0\0"..., 832)
= 832
fstat(3, {st_mode=S_IFREG|0555, st_size=440632, ...}) = 0
mmap(NULL, 2535888, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fdeb6b8f000
mprotect(0x7fdeb6bf0000, 2097152, PROT_NONE) = 0
mmap(0x7fdeb6df0000, 45056, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x61000) = 0x7fdeb6df0000
close(3) = 0
open("/lib64/libcrypto.so.1.0.0", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\313\6\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0555, st_size=2447744, ...}) = 0
mmap(NULL, 4559184, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fdeb6735000
mprotect(0x7fdeb6962000, 2097152, PROT_NONE) = 0
mmap(0x7fdeb6b62000, 167936, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x22d000) = 0x7fdeb6b62000
mmap(0x7fdeb6b8b000, 12624, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fdeb6b8b000
close(3) = 0
open("/usr/lib64/libdb-4.8.so", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@X\2\0\0\0\0\0"..., 832)
= 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1560248, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7fdeb76f6000
mmap(NULL, 3655304, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fdeb63b8000
mprotect(0x7fdeb6530000, 2097152, PROT_NONE) = 0
mmap(0x7fdeb6730000, 20480, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x178000) = 0x7fdeb6730000
close(3) = 0
open("/lib64/libz.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P#\0\0\0\0\0\0"..., 832)
= 832
fstat(3, {st_mode=S_IFREG|0755, st_size=88216, ...}) = 0
mmap(NULL, 2183304, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fdeb61a2000
mprotect(0x7fdeb61b7000, 2093056, PROT_NONE) = 0
mmap(0x7fdeb63b6000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14000) = 0x7fdeb63b6000
close(3) = 0
open("/lib64/libwrap.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0p8\0\0\0\0\0\0"..., 832)
= 832
fstat(3, {st_mode=S_IFREG|0755, st_size=40952, ...}) = 0
mmap(NULL, 2139520, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fdeb5f97000
mprotect(0x7fdeb5fa0000, 2093056, PROT_NONE) = 0
mmap(0x7fdeb619f000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x8000) = 0x7fdeb619f000
mmap(0x7fdeb61a1000, 1408, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fdeb61a1000
close(3) = 0
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\10\2\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1925280, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7fdeb76f5000
mmap(NULL, 3811872, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fdeb5bf4000
mprotect(0x7fdeb5d8e000, 2093056, PROT_NONE) = 0
mmap(0x7fdeb5f8d000, 24576, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x199000) = 0x7fdeb5f8d000
mmap(0x7fdeb5f93000, 14880, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fdeb5f93000
close(3) = 0
open("/lib64/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\240\r\0\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=18712, ...}) = 0
mmap(NULL, 2109680, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fdeb59f0000
mprotect(0x7fdeb59f2000, 2097152, PROT_NONE) = 0
mmap(0x7fdeb5bf2000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7fdeb5bf2000
close(3) = 0
open("/usr/lib64/libk5crypto.so.3", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340K\0\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=191424, ...}) = 0
mmap(NULL, 2290168, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fdeb57c0000
mprotect(0x7fdeb57ed000, 2093056, PROT_NONE) = 0
mmap(0x7fdeb59ec000, 12288, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2c000) = 0x7fdeb59ec000
mmap(0x7fdeb59ef000, 504, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fdeb59ef000
close(3) = 0
open("/usr/lib64/libkrb5support.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20:\0\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=52416, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7fdeb76f4000
mmap(NULL, 2147816, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fdeb55b3000
mprotect(0x7fdeb55bf000, 2093056, PROT_NONE) = 0
mmap(0x7fdeb57be000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xb000) = 0x7fdeb57be000
close(3) = 0
open("/lib64/libkeyutils.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320\26\0\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=14688, ...}) = 0
mmap(NULL, 2109704, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fdeb53af000
mprotect(0x7fdeb53b2000, 2093056, PROT_NONE) = 0
mmap(0x7fdeb55b1000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7fdeb55b1000
close(3) = 0
open("/lib64/libresolv.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\2209\0\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=97152, ...}) = 0
mmap(NULL, 2189896, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fdeb5198000
mprotect(0x7fdeb51ac000, 2093056, PROT_NONE) = 0
mmap(0x7fdeb53ab000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x13000) = 0x7fdeb53ab000
mmap(0x7fdeb53ad000, 6728, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fdeb53ad000
close(3) = 0
open("/lib64/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360r\0\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=135952, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7fdeb76f3000
mmap(NULL, 2213008, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fdeb4f7b000
mprotect(0x7fdeb4f93000, 2093056, PROT_NONE) = 0
mmap(0x7fdeb5192000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x17000) = 0x7fdeb5192000
mmap(0x7fdeb5194000, 13456, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fdeb5194000
close(3) = 0
open("/lib64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0ps\0\0\0\0\0\0"..., 832)
= 832
fstat(3, {st_mode=S_IFREG|0755, st_size=147208, ...}) = 0
mmap(NULL, 2251056, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fdeb4d55000
mprotect(0x7fdeb4d78000, 2093056, PROT_NONE) = 0
mmap(0x7fdeb4f77000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x22000) = 0x7fdeb4f77000
mmap(0x7fdeb4f79000, 6448, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fdeb4f79000
close(3) = 0
open("/usr/lib64/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0000\30\0\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=452976, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7fdeb76f2000
mmap(NULL, 2548232, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fdeb4ae6000
mprotect(0x7fdeb4b54000, 2093056, PROT_NONE) = 0
mmap(0x7fdeb4d53000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6d000) = 0x7fdeb4d53000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7fdeb76f1000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7fdeb76f0000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7fdeb76ee000
arch_prctl(ARCH_SET_FS, 0x7fdeb76ee840) = 0
mprotect(0x7fdeb5f8d000, 16384, PROT_READ) = 0
mprotect(0x7fdeb5192000, 4096, PROT_READ) = 0
mprotect(0x7fdeb4d53000, 4096, PROT_READ) = 0
mprotect(0x7fdeb5bf2000, 4096, PROT_READ) = 0
mprotect(0x7fdeb4f77000, 4096, PROT_READ) = 0
mprotect(0x7fdeb53ab000, 4096, PROT_READ) = 0
mprotect(0x7fdeb55b1000, 4096, PROT_READ) = 0
mprotect(0x7fdeb57be000, 4096, PROT_READ) = 0
mprotect(0x7fdeb59ec000, 8192, PROT_READ) = 0
mprotect(0x7fdeb619f000, 4096, PROT_READ) = 0
mprotect(0x7fdeb63b6000, 4096, PROT_READ) = 0
mprotect(0x7fdeb6730000, 8192, PROT_READ) = 0
mprotect(0x7fdeb6b62000, 110592, PROT_READ) = 0
mprotect(0x7fdeb6df0000, 16384, PROT_READ) = 0
mprotect(0x7fdeb6ffd000, 4096, PROT_READ) = 0
mprotect(0x7fdeb72c0000, 53248, PROT_READ) = 0
mprotect(0x7fdeb74eb000, 4096, PROT_READ) = 0
mprotect(0x5573dd954000, 8192, PROT_READ) = 0
mprotect(0x7fdeb770d000, 4096, PROT_READ) = 0
munmap(0x7fdeb76f8000, 80522) = 0
set_tid_address(0x7fdeb76eeb10) = 18042
set_robust_list(0x7fdeb76eeb20, 24) = 0
rt_sigaction(SIGRTMIN, {0x7fdeb4f81d80, [], SA_RESTORER|SA_SIGINFO,
0x7fdeb4f8bb10}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {0x7fdeb4f81e10, [],
SA_RESTORER|SA_RESTART|SA_SIGINFO, 0x7fdeb4f8bb10}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
statfs("/sys/fs/selinux", 0x7ffe1b4e8b00) = -1 ENOENT (No such file or
directory)
statfs("/selinux", {f_type="EXT2_SUPER_MAGIC", f_bsize=4096,
f_blocks=474903111, f_bfree=452714842, f_bavail=452228240,
f_files=120627200, f_ffree=120300880, f_fsi\
d={352889743, -1913047647}, f_namelen=255, f_frsize=4096}) = 0
brk(0) = 0x5573deaf5000
brk(0x5573deb16000) = 0x5573deb16000
open("/proc/filesystems", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7fdeb770b000
read(3, "nodev\tsysfs\nnodev\trootfs\nnodev\tr"..., 1024) = 297
read(3, "", 1024) = 0
close(3) = 0
munmap(0x7fdeb770b000, 4096) = 0
access("/etc/selinux/config", F_OK) = -1 ENOENT (No such file or
directory)
stat("/dev/urandom", {st_mode=S_IFCHR|0666, st_rdev=makedev(1, 9), ...}) = 0
open("/dev/urandom", O_RDONLY|O_CLOEXEC) = 3
read(3, "\355\207\254Q\253\17d\266\22x\324\257
\236\205H\327b\32\221nzmx\251\216D\257J\362\301\357"..., 60) = 60
close(3) = 0
open("/dev/urandom", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFCHR|0666, st_rdev=makedev(1, 9), ...}) = 0
poll([{fd=3, events=POLLIN}], 1, 10) = 1 ([{fd=3, revents=POLLIN}])
read(3,
"r\324\5\243C\224\n\222d\333\25\25\2738\7\ts\351\3759\265\207&\n\251}\316\205\224v\17\253"...,
1024) = 1024
close(3) = 0
getuid() = 0
stat("/dev/urandom", {st_mode=S_IFCHR|0666, st_rdev=makedev(1, 9), ...}) = 0
open("/dev/urandom", O_RDONLY|O_CLOEXEC) = 3
read(3, "\3323i\236\226J\353\241\201\213\20\30\201b<\371\5\246\234\230",
20) = 20
close(3) = 0
stat("/dev/urandom", {st_mode=S_IFCHR|0666, st_rdev=makedev(1, 9), ...}) = 0
open("/dev/urandom", O_RDONLY|O_CLOEXEC) = 3
read(3,
"u2V%3\367\276\251\202$\376_\1\365r`N^\5?\303H\330\3173i\335\247]A\222\376"...,
256) = 256
close(3) = 0
stat("/dev/urandom", {st_mode=S_IFCHR|0666, st_rdev=makedev(1, 9), ...}) = 0
open("/dev/urandom", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\333_\2\335]:\7\"\373s]\352\375\305\312t\244.@;\245\345\245^(\262d\350\273[\327-"...,
216) = 216
close(3) = 0
stat("/dev/urandom", {st_mode=S_IFCHR|0666, st_rdev=makedev(1, 9), ...}) = 0
open("/dev/urandom", O_RDONLY|O_CLOEXEC) = 3
read(3, "\207", 1) = 1
close(3) = 0
stat("/dev/urandom", {st_mode=S_IFCHR|0666, st_rdev=makedev(1, 9), ...}) = 0
open("/dev/urandom", O_RDONLY|O_CLOEXEC) = 3
read(3, "\332", 1) = 1
close(3) = 0
stat("/dev/urandom", {st_mode=S_IFCHR|0666, st_rdev=makedev(1, 9), ...}) = 0
open("/dev/urandom", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\22\335\242$\210`\376\376d\200\215m\213-\0162\r\257\206\335\nY\343\3376/\224\352\360\312\336\360",
32) = 32
close(3) = 0
stat("/dev/urandom", {st_mode=S_IFCHR|0666, st_rdev=makedev(1, 9), ...}) = 0
open("/dev/urandom", O_RDONLY|O_CLOEXEC) = 3
read(3,
"U\2\251M\21fm\345\334\215Q1(\253\1M!\270\226\212s&A\263}\351\16\271",
28) = 28
close(3) = 0
futex(0x7fdeb5bf30a8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
open("/lib64/.libcrypto.so.1.0.0.hmac", O_RDONLY) = -1 ENOENT (No such
file or directory)
open("/proc/sys/crypto/fips_enabled", O_RDONLY) = -1 ENOENT (No such
file or directory)
access("/lib64/.libcrypto.so.1.0.0.hmac", F_OK) = -1 ENOENT (No such
file or directory)
open("/etc/localtime", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=127, ...}) = 0
fstat(3, {st_mode=S_IFREG|0644, st_size=127, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7fdeb770b000
read(3,
"TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\0\0\0\1\0\0\0\0"..., 4096)
= 127
lseek(3, -71, SEEK_CUR) = 56
read(3,
"TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\0\0\0\1\0\0\0\0"..., 4096) = 71
close(3) = 0
munmap(0x7fdeb770b000, 4096) = 0
socket(PF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 3
connect(3, {sa_family=AF_LOCAL, sun_path="/dev/log"}, 110) = 0
sendto(3, "<11>May 23 10:11:18 imapd: could"..., 67, MSG_NOSIGNAL, NULL,
0) = 67
exit_group(70) = ?
+++ exited with 70 +++
Michael
On 05/19/2017 05:55 PM, Michael Ulitskiy wrote:
Msg # 57050 Previous in Sequence
<http://asg.andrew.cmu.edu/archive/message.php?mailbox=archive.info-cyrus&msg=57374>
Date Fri, 19 May 2017 11:32:38 -0400
To info-cyrus@lists.andrew.cmu.edu
From Michael Ulitskiy <mulits...@acedsl.com>
Reply-To: Michael Ulitskiy <mulits...@acedsl.com>
Subject Re: Multi-thread cyrus delayed forking of imapd processes after
connecting to master listener
My immediate guess is it blocks at reading /dev/random.
strace should show you exactly where it blocks.
What version of SASL are you using? Newer versions have switched to
/dev/urandom AFAIK
Michael
On Friday, May 19, 2017 05:48:36 PM Michael Hieb wrote:
Apologies for long post, most of it is configuration details.
I have recently changed from a single threaded cyrus server in which
multiple domains were overloaded on one listener as multiple virtual
domains to a multiple threaded cyrus server in which multiple domains
are listened for on separate ip addresses with separate configurations.
The primary motivation was to have separate tls certificates for each
domain. The problem is that I can connect to cyrus listener on all
ip/ports for all domains, but while one of them will fork immediately
and respond with a banner, the others will delay for a period of time
from a few seconds to a minute or so before forking and responding with
a banner. With the same setup, I change to a single threaded cyrus
server to listen on all ip/ports then I get an immediate response on
all, but of course I do not get the separate tls certificate or
configuration. It is replicable that switching between the single
threaded and multiple threaded configuration triggers the problem. I
have searched the logs and the mail-lists and found nothing that seems
related.
Question: why does switching to multiple threaded cyrus server trigger
delayed forking of imapd processes after connecting to master listener?
On listener which responds immediately (as expected) I get this:
user@somehost:~> telnet imap.domain1.com 143
Trying 192.168.110.171...
Connected to imap.domain1.com.
Escape character is '^]'.
* OK [CAPABILITY IMAP4rev1 LITERAL+ ID ENABLE STARTTLS AUTH=GSS-SPNEGO
AUTH=GSSAPI AUTH=DIGEST-MD5 AUTH=CRAM-MD5 AUTH=LOGIN AUTH=PLAIN SASL-IR]
imap.domain1.com Cyrus IMAP v2.4.18 server ready
On listener with delay, I get this (and process hangs for many seconds
or even a minute or two):
user@somehost:~> telnet imap.domain2.com 143
Trying 192.168.110.171...
Connected to imap.domain2.com.
Escape character is '^]'.
The domain for which the listener responds and the one for which it
delays seems to change and be random as far as I can tell.
There is nothing in the log journal that looks different from when we
connect and get a for and when we connect and get a delay.
May 19 09:44:31 MAILSERVER master[13762]: about to exec
/usr/lib/cyrus/bin/imapd
May 19 09:44:31 MAILSERVER imap[13762]: executed
May 19 09:44:31 MAILSERVER imap[13762]: IOERROR: opening
/var/lib/imap/user_deny.db: No such file or directory
and once imapd forks and banner is generated
May 19 09:46:45 MAILSERVER imap[13814]: accepted connection
Here are the configuration details:
I run cyrus 2.4.18-3.6 on openSuSE Leap 42.2 Linux MAILSERVER
4.4.62-18.6-default #1 SMP Fri Apr 21 16:14:48 UTC 2017 (84f9824) x86_64
x86_64 x86_64 GNU/Linux.
Here is my (sanitized) cyrus.conf and one imapd.conf (they all look
alike except for certificate and domain specifics).
MAILSERVER:~ # cat /etc/cyrus.conf
START {
# do not delete this entry!
recover cmd="ctl_cyrusdb -r"
# this is only necessary if using idled for IMAP IDLE
idled cmd="idled"
}
# UNIX sockets start with a slash and are put into /var/lib/imap/socket
SERVICES {
# add or remove based on preferences
#imap cmd="imapd" listen="imap" maxchild=-1 maxforkrate=100
imap cmd="imapd -C /etc/imapd.domain1.com.conf "
listen="192.168.171.4:imap" maxchild=-1 maxforkrate=100
imap cmd="imapd -C /etc/imapd.domain1.com.conf "
listen="192.168.110.171:imap" maxchild=-1 maxforkrate=100
imap cmd="imapd -C /etc/imapd.domain2.com.conf "
listen="192.168.172.4:imap" maxchild=-1 maxforkrate=100
imap cmd="imapd -C /etc/imapd.domain2.com.conf "
listen="192.168.110.172:imap" maxchild=-1 maxforkrate=100
imap cmd="imapd -C /etc/imapd.domain3.com.conf "
listen="192.168.174.4:imap" maxchild=-1 maxforkrate=100
imap cmd="imapd -C /etc/imapd.domain3.com.conf "
listen="192.168.110.174:imap" maxchild=-1 maxforkrate=100
imap cmd="imapd -C /etc/imapd.domain4.com.conf "
listen="192.168.175.4:imap" maxchild=-1 maxforkrate=100
imap cmd="imapd -C /etc/imapd.domain4.com.conf "
listen="192.168.110.175:imap" maxchild=-1 maxforkrate=100
imap cmd="imapd -C /etc/imapd.domain5.com.conf "
listen="192.168.176.4:imap" maxchild=-1 maxforkrate=100
imap cmd="imapd -C /etc/imapd.domain5.com.conf "
listen="192.168.110.176:imap" maxchild=-1 maxforkrate=100
imap cmd="imapd -C /etc/imapd.domain6.com.conf "
listen="192.168.177.4:imap" maxchild=-1 maxforkrate=100
imap cmd="imapd -C /etc/imapd.domain6.com.conf "
listen="192.168.110.177:imap" maxchild=-1 maxforkrate=100
#imaps cmd="imapd -s" listen="imaps" maxchild=-1 maxforkrate=100
imaps cmd="imapd -C /etc/imapd.domain1.com.conf -s "
listen="192.168.171.4:imaps" maxchild=-1 maxforkrate=100
imaps cmd="imapd -C /etc/imapd.domain1.com.conf -s "
listen="192.168.110.171:imaps" maxchild=-1 maxforkrate=100
imaps cmd="imapd -C /etc/imapd.domain2.com.conf -s "
listen="192.168.172.4:imaps" maxchild=-1 maxforkrate=100
imaps cmd="imapd -C /etc/imapd.domain2.com.conf -s "
listen="192.168.110.172:imaps" maxchild=-1 maxforkrate=100
imaps cmd="imapd -C /etc/imapd.domain3.com.conf -s "
listen="192.168.174.4:imaps" maxchild=-1 maxforkrate=100
imaps cmd="imapd -C /etc/imapd.domain3.com.conf -s "
listen="192.168.110.174:imaps" maxchild=-1 maxforkrate=100
imaps cmd="imapd -C /etc/imapd.domain4.com.conf -s "
listen="192.168.175.4:imaps" maxchild=-1 maxforkrate=100
imaps cmd="imapd -C /etc/imapd.domain4.com.conf -s "
listen="192.168.110.175:imaps" maxchild=-1 maxforkrate=100
imaps cmd="imapd -C /etc/imapd.domain5.com.conf -s "
listen="192.168.176.4:imaps" maxchild=-1 maxforkrate=100
imaps cmd="imapd -C /etc/imapd.domain5.com.conf -s "
listen="192.168.110.176:imaps" maxchild=-1 maxforkrate=100
imaps cmd="imapd -C /etc/imapd.domain6.com.conf -s "
listen="192.168.177.4:imaps" maxchild=-1 maxforkrate=100
imaps cmd="imapd -C /etc/imapd.domain6.com.conf -s "
listen="192.168.110.177:imaps" maxchild=-1 maxforkrate=100
#pop3 cmd="pop3d" listen="pop3"
#pop3s cmd="pop3d -s" listen="pop3s"
#sieve cmd="timsieved" listen="sieve" maxchild=-1 maxforkrate=100
sieve cmd="timsieved -C /etc/imapd.domain1.com.conf"
listen="192.168.171.4:sieve" maxchild=-1 maxforkrate=100
sieve cmd="timsieved -C /etc/imapd.domain1.com.conf"
listen="192.168.110.171:sieve" maxchild=-1 maxforkrate=100
sieve cmd="timsieved -C /etc/imapd.domain2.com.conf"
listen="192.168.172.4:sieve" maxchild=-1 maxforkrate=100
sieve cmd="timsieved -C /etc/imapd.domain2.com.conf"
listen="192.168.110.172:sieve" maxchild=-1 maxforkrate=100
sieve cmd="timsieved -C /etc/imapd.domain3.com.conf"
listen="192.168.174.4:sieve" maxchild=-1 maxforkrate=100
sieve cmd="timsieved -C /etc/imapd.domain3.com.conf"
listen="192.168.110.174:sieve" maxchild=-1 maxforkrate=100
sieve cmd="timsieved -C /etc/imapd.domain4.com.conf"
listen="192.168.175.4:sieve" maxchild=-1 maxforkrate=100
sieve cmd="timsieved -C /etc/imapd.domain4.com.conf"
listen="192.168.110.175:sieve" maxchild=-1 maxforkrate=100
sieve cmd="timsieved -C /etc/imapd.domain5.com.conf"
listen="192.168.176.4:sieve" maxchild=-1 maxforkrate=100
sieve cmd="timsieved -C /etc/imapd.domain5.com.conf"
listen="192.168.110.176:sieve" maxchild=-1 maxforkrate=100
sieve cmd="timsieved -C /etc/imapd.domain6.com.conf"
listen="192.168.177.4:sieve" maxchild=-1 maxforkrate=100
sieve cmd="timsieved -C /etc/imapd.domain6.com.conf"
listen="192.168.110.177:sieve" maxchild=-1 maxforkrate=100
#ptloader cmd="ptloader" listen="/var/lib/imap/ptclient/ptsock"
# at least one LMTP is required for delivery
lmtp cmd="lmtpd -a" listen="mail.domain1.com:lmtp" maxchild=-1
maxforkrate=100
lmtp cmd="lmtpd -a" listen="mail.domain2.com:lmtp" maxchild=-1
maxforkrate=100
lmtp cmd="lmtpd -a" listen="mail.domain3.com:lmtp" maxchild=-1
maxforkrate=100
lmtp cmd="lmtpd -a" listen="mail.domain4.com:lmtp" maxchild=-1
maxforkrate=100
lmtp cmd="lmtpd -a" listen="mail.domain5.com:lmtp" maxchild=-1
maxforkrate=100
lmtp cmd="lmtpd -a" listen="mail.domain6.com:lmtp" maxchild=-1
maxforkrate=100
#lmtpunix cmd="lmtpd" listen="/var/lib/imap/socket/lmtp"
# this is only necessary if using notifications
#notify cmd="notifyd" listen="/var/lib/imap/socket/notify" proto="udp"
}
EVENTS {
# this is required
checkpoint cmd="ctl_cyrusdb -c" period=30
# this is only necessary if using duplicate delivery suppression,
# Sieve or NNTP
duplicateprune cmd="cyr_expire -E 3" at=0400
# Expire data older then 69 days. Two full months of 31 days
# each includes two full backup cycles, plus 1 week margin
# because we run our full backups on the first sat/sun night
# of each month.
deleteprune cmd="cyr_expire -E 4 -D 69" at=0430
expungeprune cmd="cyr_expire -E 4 -X 69" at=0445
# this is only necessary if caching TLS sessions
tlsprune cmd="tls_prune" at=0400
# Uncomment the next entry, if you want to automatically remove
# old messages of EVERY user.
# This example calls ipurge every 60 minutes and ipurge will delete
# ALL messages older then 120 days.
# enter 'man 8 ipurge' for more details
#cleanup cmd="ipurge -d 120 -f" period=60
cleanup cmd="ipurge -f -d 30 user/%/Spam*@domain1.com" period=60
cleanup cmd="ipurge -f -d 30 user/%/Spam*@domain2.com" period=60
cleanup cmd="ipurge -f -d 30 user/%/Spam*@domain3.com" period=60
cleanup cmd="ipurge -f -d 30 user/%/Spam*@domain4.com" period=60
cleanup cmd="ipurge -f -d 30 user/%/Spam*@domain5.com" period=60
cleanup cmd="ipurge -f -d 30 user/%/Spam*@domain6.com" period=60
cleanup cmd="ipurge -f -d 30 user/%/Trash*@domain1.com" period=60
cleanup cmd="ipurge -f -d 30 user/%/Trash*@domain2.com" period=60
cleanup cmd="ipurge -f -d 30 user/%/Trash*@domain3.com" period=60
cleanup cmd="ipurge -f -d 30 user/%/Trash*@domain4.com" period=60
cleanup cmd="ipurge -f -d 30 user/%/Trash*@domain5.com" period=60
cleanup cmd="ipurge -f -d 30 user/%/Trash*@domain6.com" period=60
cleanup cmd="ipurge -f -d 60 user/%/Sent*@domain1.com" period=60
cleanup cmd="ipurge -f -d 60 user/%/Sent*@domain2.com" period=60
cleanup cmd="ipurge -f -d 60 user/%/Sent*@domain3.com" period=60
cleanup cmd="ipurge -f -d 60 user/%/Sent*@domain4.com" period=60
cleanup cmd="ipurge -f -d 60 user/%/Sent*@domain5.com" period=60
cleanup cmd="ipurge -f -d 60 user/%/Sent*@domain6.com" period=60
# Create search indexes regularly
squatter cmd="squatter -s -i" at=0530
# running sa-learn
sa-learn cmd="/usr/local/bin/cyrus-salearn.pl" period=60
sa-update cmd="/usr/bin/sa-update -v" at=0000
}
MAILSERVER:~ # cat /etc/imapd.domain1.com.conf
configdirectory: /var/lib/imap
partition-default: /var/spool/imap
sievedir: /var/lib/sieve
annotation_definitions: /etc/imapd.annotations.conf
# admins: cy...@domain1.net
allowanonymouslogin: no
autocreatequota: 10000
reject8bit: no
quotawarn: 90
timeout: 30
poptimeout: 10
dracinterval: 0
drachost: localhost
sasl_pwcheck_method: saslauthd
lmtp_overquota_perm_failure: no
#lmtp_catchall_mailbox: admin
lmtp_downcase_rcpt: yes
lmtp_fuzzy_mailbox_match: yes
expunge_mode: delayed
deletedprefix: DELETED
delete_mode: delayed
# added by Michael Hieb Jun 22 2014
allowplaintext: yes
unixhierarchysep: yes
allowplainwithouttls: no
altnamespace: no
virtdomains: userid
servername: imap.domain1.net
#
# if you want TLS, you have to generate certificates and keys
#
tls_cert_file: /etc/letsencrypt/live/imap.domain1.net/cert.pem
tls_key_file: /etc/letsencrypt/live/imap.domain1.net/privkey.pem
tls_ca_file: /etc/letsencrypt/live/imap.domain1.net/chain.pem
tls_ca_path: /etc/ssl/certs
tls_versions: tls1_0 tls1_1 tls1_2
# added by Michael Hieb 20-Jan-2017 for lmtp on port (not socket)
lmtp_admins: lmtpuser
MAILSERVER:~ #
Note: before I discovered the problem with forking could be triggered by
switching between single threaded and multi-threaded cyrus server, I
thought problem could be related to resource constraints. This is why I
set all processes with maxchild=-1 maxforkrate=100. I also set the
following in /etc/systemd/system/cyrus.service
MAILSERVER:~ # cat /etc/systemd/system/cyrus.service
[deleted...]
LimitRTPRIO=50000
LimitNOFILE=50000
LimitNPROC=50000
MAILSERVER:~ #
None of these resource settings made any difference and the problem goes
away as soon as cyrus is single threaded - so I do not believe it is a
resource constraint (at least one I understand at this point).
Any help would be much appreciated.
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