On 17.08.2011 09:35 , Balazs Scheidler wrote:

On Fri, 2011-07-29 at 15:35 +0200, Remy Zandwijk wrote:

...

Hi list,

I use syslog-ng to create log files from within a script. The script sends the message through a pipe to syslog-ng, which I use as command line tool. In the syslog-ng.conf I created a source which reads the standard input. very simplified:

Config: source src { pipe("/dev/fd/0"); }; destination dst { file("/tmp/test.log"); }; log { source(src); destination(dst); };

Called as:

echo "test" | /usr/sbin/syslog-ng -f /tmp/syslog-ng.conf

This works perfectly in 2.0.9. Now I am in the process of upgrading the system and syslog-ng 3.2.4. With this version of syslog-ng the config file above results in an error:

Error opening file for reading; filename='/dev/fd/0', error='Text file busy (26)' Error initializing source driver; source='src', id='src#0' Error initializing message pipeline;

I tried several things to get rid of this error, like replacing 'pipe' in 'file', but nothing seems to work. hmm... the text file busy error is returned by the kernel. Are you sure you only changed syslog-ng to a newer version and you are otherwise running on the same system?

But in any case, I'd try to diagnose the problem using strace, what does syslog-ng try and what error does the kernel return if any?

ETXTBSY pathname refers to an executable image which is currently being executed and write access was requested

syslog-ng indeed opens the file read-write (which it probably shouldn't), but I can't remember changing this recently. (maybe I did though).

Can you confirm that this is the case.

Hi Baszi, strace output below. I left some access("/etc/ld.so.nohwcap".. lines out. The machine is running as VM in vSphere 4.1, but I see the same behaviour in a VM which is running in Virtuozo. The VM is Debian 6 with kernel 2.6.32-5-amd64. Is this enough information or do you need more? -Remy access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/libattr.so.1", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0p\24\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=17608, ...}) = 0 mmap(NULL, 2112752, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f8e1fe7b000 mprotect(0x7f8e1fe7f000, 2093056, PROT_NONE) = 0 mmap(0x7f8e2007e000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f8e2007e000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8e22a05000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8e22a04000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8e22a03000 arch_prctl(ARCH_SET_FS, 0x7f8e22a04700) = 0 mprotect(0x7f8e202ff000, 4096, PROT_READ) = 0 mprotect(0x7f8e20503000, 4096, PROT_READ) = 0 mprotect(0x7f8e2085c000, 16384, PROT_READ) = 0 mprotect(0x7f8e20a7c000, 4096, PROT_READ) = 0 mprotect(0x7f8e225e9000, 4096, PROT_READ) = 0 mprotect(0x7f8e227f3000, 4096, PROT_READ) = 0 mprotect(0x7f8e22a12000, 4096, PROT_READ) = 0 munmap(0x7f8e22a0c000, 15482) = 0 set_tid_address(0x7f8e22a049d0) = 16868 set_robust_list(0x7f8e22a049e0, 0x18) = 0 futex(0x7fff195519ac, FUTEX_WAKE_PRIVATE, 1) = 0 futex(0x7fff195519ac, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 1, NULL, 7f8e22a04700) = -1 EAGAIN (Resource temporarily unavailable) rt_sigaction(SIGRTMIN, {0x7f8e2086b860, [], SA_RESTORER|SA_SIGINFO, 0x7f8e20874f60}, NULL, 8) = 0 rt_sigaction(SIGRT_1, {0x7f8e2086b8f0, [], SA_RESTORER|SA_RESTART|SA_SIGINFO, 0x7f8e20874f60}, NULL, 8) = 0 rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0 getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0 brk(0) = 0x163d000 brk(0x165e000) = 0x165e000 open("/usr/lib/charset.alias", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/gconv/gconv-modules.cache", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=26048, ...}) = 0 mmap(NULL, 26048, PROT_READ, MAP_SHARED, 3, 0) = 0x7f8e229fc000 close(3) = 0 futex(0x7f8e20860f60, FUTEX_WAKE_PRIVATE, 2147483647) = 0 ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff195518a0) = -1 EINVAL (Invalid argument) setrlimit(RLIMIT_NOFILE, {rlim_cur=4*1024, rlim_max=4*1024}) = 0 pipe([3, 4]) = 0 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f8e22a049d0) = 16869 close(4) = 0 read(3, "2\n", 6) = 2 --- SIGCHLD (Child exited) @ 0 (0) --- close(3) = 0 exit_group(2) = ?