Unexpected write() failure on attempt to write

[tuvok81]

i have no idea why he is doing this ..
he have enought hdd/ssd on the vm and the access rights are also correct its a eggdrop-1.10.0

[18:46] [18:46:59] Connected to irc.belwue.de
[18:46] [18:46:59] -NOTICE- Server is currently in split-mode.
[19:00] [19:00:00] Schreibe Benutzerdatei...
[19:00] [19:00:00] Writing channel file...
[20:00] [20:00:00] Schreibe Benutzerdatei...
[20:00] [20:00:00] Writing channel file...
[20:16] [20:16:29] Unexpected write() failure on attempt to write 36 bytes to fd 1: Input/output error.
[20:16] [20:16:29] Unexpected write() failure on attempt to write 67 bytes to fd 1: Input/output error.
[21:00] [21:00:00] Schreibe Benutzerdatei...
[21:00] [21:00:00] Unexpected write() failure on attempt to write 37 bytes to fd 1: Input/output error.
[21:00] [21:00:00] Writing channel file...
[21:00] [21:00:00] Unexpected write() failure on attempt to write 35 bytes to fd 1: Input/output error.

[michaelortmann]

You could try strace (strace ./eggdrop -t ...) to see the filename opened for writing and see if any close(), unlink() or rename() functions fail before the write() error shows.

For those user- and chan-files, eggdrop should open <filename>~new, then write, then close, then unlink (=remove) <filename> and then finally rename <filename>~new to <filename>

[michaelortmann]

Additionally chan.mod also writes bans/exempts/invites to <userfilename>~new(). In this case the file is closed and instantly reopened.

[michaelortmann]

Also there is an eggdrop setting userfile-perm that is applied to new files created by eggdrop. This setting can be changed on the fly. So one of my very wild guesses is, that if you set userfile-perm to world-writeable, some VM policy could detect some forbidden behaviour and hardkill the file or something? But im very very wild guessing here.

[tuvok81]

You could try strace (strace ./eggdrop -t ...) to see the filename opened for writing and see if any close(), unlink() or rename() functions fail before the write() error shows.

For those user- and chan-files, eggdrop should open <filename>~new, then write, then close, then unlink (=remove) <filename> and then finally rename <filename>~new to <filename>

this is my strace
16:50:01.124732 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=1601405, si_uid=1003} ---
16:55:01.147541 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=1847721, si_uid=1003} ---
17:00:01.166837 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=2094300, si_uid=1003} ---
17:05:01.189143 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=2340013, si_uid=1003} ---
17:10:01.220013 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=2586578, si_uid=1003} ---
17:15:01.241473 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=2832719, si_uid=1003} ---
17:20:01.276237 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=3077799, si_uid=1003} ---
17:25:01.295642 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=3320325, si_uid=1003} ---
17:30:01.326778 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=3561206, si_uid=1003} ---
17:35:01.345228 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=3804791, si_uid=1003} ---
17:40:01.375110 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=4050945, si_uid=1003} ---
17:45:01.395526 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=105778, si_uid=1003} ---
17:50:01.416032 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=353957, si_uid=1003} ---
17:55:01.435362 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=601421, si_uid=1003} ---
18:00:01.463909 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=849496, si_uid=1003} ---
18:05:01.489617 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=1096112, si_uid=1003} ---
18:10:01.521574 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=1342024, si_uid=1003} ---
18:15:01.546085 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=1587144, si_uid=1003} ---
18:20:01.599773 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=1831540, si_uid=1003} ---
18:25:01.622958 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=2077400, si_uid=1003} ---
18:30:01.682137 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=2323532, si_uid=1003} ---
18:35:01.714248 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=2570464, si_uid=1003} ---
18:40:01.743376 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=2818722, si_uid=1003} ---
18:45:01.783781 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=3066440, si_uid=1003} ---
18:50:01.810484 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=3315428, si_uid=1003} ---
18:55:01.839597 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=3564074, si_uid=1003} ---
19:00:01.882925 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=3811866, si_uid=1003} ---
19:05:01.909600 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=4058257, si_uid=1003} ---
19:10:01.944986 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=114065, si_uid=1003} ---
19:15:01.980821 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=360474, si_uid=1003} ---
19:20:02.023587 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=607200, si_uid=1003} ---
19:25:01.042882 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=850912, si_uid=1003} ---
19:30:01.064299 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=1097014, si_uid=1003} ---
19:35:01.082345 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=1344090, si_uid=1003} ---
19:40:01.110137 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=1591696, si_uid=1003} ---
19:45:01.131375 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=1839390, si_uid=1003} ---
19:50:01.150684 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=2088496, si_uid=1003} ---
19:55:01.170903 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=2335376, si_uid=1003} ---
20:00:01.199959 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=2582097, si_uid=1003} ---
20:05:01.222215 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=2824620, si_uid=1003} ---
20:10:01.253412 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=3070450, si_uid=1003} ---
20:15:01.271313 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=3317560, si_uid=1003} ---
20:20:01.301779 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=3561157, si_uid=1003} ---
20:25:01.323403 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=3803487, si_uid=1003} ---
20:30:01.343130 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=4048211, si_uid=1003} ---
20:35:01.367145 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=99979, si_uid=1003} ---
20:40:01.401060 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=348476, si_uid=1003} ---
20:45:01.418053 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=594703, si_uid=1003} ---
20:50:01.439744 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=842258, si_uid=1003} ---
20:55:01.466899 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=1092862, si_uid=1003} ---
21:00:01.495582 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=1341508, si_uid=1003} ---
21:05:01.533760 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=1587877, si_uid=1003} ---
21:10:01.597461 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=1833654, si_uid=1003} ---
21:15:01.662719 --- SIGCHLD {si_signo=SIGCHLD, si_code=SI_USER, si_pid=2081594, si_uid=1003} ---

[tuvok81]

Also there is an eggdrop setting userfile-perm that is applied to new files created by eggdrop. This setting can be changed on the fly. So one of my very wild guesses is, that if you set userfile-perm to world-writeable, some VM policy could detect some forbidden behaviour and hardkill the file or something? But im very very wild guessing here.

i have do nothing on that

set userfile-perm 0600

[michaelortmann]

I didnt see any SIGCHLD with eggdrop. eggdrop core doesnt fork child-processes. could be related to tcl scripts executing child processes? so maybe the whole issue is related to some script?

a "normal" strace of a user/chanfile save should look like:

write(1, "Saving user file...\n", 20Saving user file...
)   = 20
openat(AT_FDCWD, "BotA.user~new", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 8
chmod("BotA.user~new", 0600)            = 0
write(7, "[04:38:20] Writing user file...\n", 32) = 32
write(1, "[04:38:20] Writing user file...\n", 32[04:38:20] Writing user file...
) = 32
newfstatat(AT_FDCWD, "/etc/localtime", {st_mode=S_IFREG|0644, st_size=2298, ...}, 0) = 0
fstat(8, {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
write(8, "#4v: eggdrop v1.10.0+pythonfixes"..., 3742) = 3742
close(8)                                = 0
openat(AT_FDCWD, "BotA.user~new", O_WRONLY|O_CREAT|O_APPEND, 0666) = 8
lseek(8, 0, SEEK_END)                   = 3742
fstat(8, {st_mode=S_IFREG|0600, st_size=3742, ...}) = 0
write(8, "*ban - -\n- %sadasd!asda@*:+0:+16"..., 177) = 177
close(8)                                = 0
openat(AT_FDCWD, "BotA.chan~new", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 8
chmod("BotA.chan~new", 0600)            = 0
write(7, "[04:38:19] Writing channel file."..., 35) = 35
write(1, "[04:38:19] Writing channel file."..., 35[04:38:19] Writing channel file...
) = 35
newfstatat(AT_FDCWD, "/etc/localtime", {st_mode=S_IFREG|0644, st_size=2298, ...}, 0) = 0
fstat(8, {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
write(8, "#Dynamic Channel File for BotA ("..., 696) = 696
close(8)                                = 0
unlink("BotA.chan")                     = 0
rename("BotA.chan~new", "BotA.chan")    = 0
rename("BotA.user~new", "BotA.user")    = 0
pselect6(7, [0 4 5 6], NULL, NULL, {tv_sec=1, tv_nsec=0}, NULL) = 0 (Timeout)
pselect6(7, [0 4 5 6], NULL, NULL, {tv_sec=1, tv_nsec=0}, NULL) = 0 (Timeout)

[tuvok81]

i have no scripts installed only the standard .. but for the moment the eggdrop run normal