Le 18.08.2012 11:56, Alex Bligh a écrit :
--On 18 August 2012 11:35:29 +0200 Denis BUCHER <dbucherml@xxxxxxxxxxxxx> wrote:OK, but my problem is that when I detect an "offending" process (using too much memory), it's already too late ! The strace will only show mmaps until "[crit] Memory allocation failed" ! Do you have a suggestion on how I could "intercept" these processes before the problem happens ?rlimit maybe. I'd suggest something is trying to allocate a 'negative' amount of memory. The real answer is to locate the bug. If you really want to do that, build/install debug versions of your s/w, attach gdb to the running process, and ask for a backtrace.
And I think I was able to capture the strace :
accept(4, {sa_family=AF_INET6, sin6_port=htons(42635), inet_pton(AF_INET6, "::ffff:66.249.66.5", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, [68719476764]) = 18
semop(7438351, 0x2b91b7f24da6, 1) = 0
getsockname(18, {sa_family=AF_INET6, sin6_port=htons(80), inet_pton(AF_INET6, "::ffff:213.162.5.179", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, [68719476764]) = 0
fcntl(18, F_GETFL) = 0x2 (flags O_RDWR)
fcntl(18, F_SETFL, O_RDWR|O_NONBLOCK) = 0
read(18, "GET /search/Delight%20combinaiso"..., 8000) = 280
stat("/var/www/vhosts/ourserver.ch/www/http/search/Delight combinaison/metas-12-00088/1/de", 0x7fff2c6fe8c0) = -1 ENOENT (No such file or directory)
lstat("/var", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/var/www", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/var/www/vhosts", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/var/www/vhosts/ourserver.ch", {st_mode=S_IFDIR|S_ISGID|0755, st_size=4096, ...}) = 0
lstat("/var/www/vhosts/ourserver.ch/www", {st_mode=S_IFDIR|S_ISGID|0755, st_size=4096, ...}) = 0
lstat("/var/www/vhosts/ourserver.ch/www/http", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
open("/var/www/vhosts/ourserver.ch/www/http/.htaccess", O_RDONLY) = 19
fstat(19, {st_mode=S_IFREG|0440, st_size=7995, ...}) = 0
read(19, "\n\n##############################"..., 4096) = 4096
read(19, "t_bw=$4&inc=$6&slang=$8 [P]\nRewr"..., 4096) = 3899
read(19, "", 4096) = 0
close(19) = 0
lstat("/var/www/vhosts/ourserver.ch/www/http/search", 0x7fff2c6fe8c0) = -1 ENOENT (No such file or directory)
) = 0
epoll_wait(17, brk(0x2b91bbe3c000) = 0x2b91bbe16000Then, it only does mmap/brk until "Cannot allocate memory"
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