Hi,
On Sat, Feb 13, 2016 at 04:05:50AM +0100, Pas wrote:
> Hello!
>
> I would like to ask for a bit of help and maybe report a bug (but it's
> probably just a known, however, a rather confusing behavior of strace).
>
> While running serf (a Raft consensus agent) in Docker (which uses cgroups
> and kernel namespaces) I got a strange error. ("==> Failed to start the
> Serf agent: Error creating Serf: Failed to create memberlist: Failed to
> start TCP listener. Err: listen tcp 0.0.0.0:7946: socket: operation not
> permitted") But the process inside the container should be behaving as a
> process running as root, with all the necessary capabilities.
>
> So, strace-ing from the host (cannot strace/ptrace from the container
> without using --privileged), I get the following trace:
>
> ...
> [pid 17148] read(3, <unfinished ...>
> [pid 17144] clock_gettime(CLOCK_MONOTONIC, <unfinished ...>
> [pid 17148] <... read resumed> "", 4096) = 0
> [pid 17144] <... clock_gettime resumed> {939382190280542405,
> 579195224836800512}) = 0
> [pid 17148] close(3 <unfinished ...>
> [pid 17144] clock_gettime(CLOCK_REALTIME, <unfinished ...>
> [pid 17148] <... close resumed> ) = 0
> [pid 17144] <... clock_gettime resumed> {4155469542819979293, 17314723865})
> = 0
> [pid 17148] clock_gettime(CLOCK_REALTIME, <unfinished ...>
> [pid 17144] _newselect(0, NULL, NULL, NULL, {85899345920, 86034069969}
> <unfinished ...>
> [pid 17148] <... clock_gettime resumed> {4155579120320602141,
> 598189438530486336}) = 0
> [pid 17148] futex(0x18928620, FUTEX_WAKE, 1) = 1
> [pid 17146] <... futex resumed> ) = 0
> [pid 17146] _newselect(0, NULL, NULL, NULL, {429496729600, 429631460482}
> <unfinished ...>
> [pid 17144] <... _newselect resumed> ) = 0 (Timeout)
> [pid 17144] clock_gettime(CLOCK_MONOTONIC, {940046419857770693,
> 579195224836800512}) = 0
> [pid 17144] clock_gettime(CLOCK_REALTIME, <unfinished ...>
> [pid 17148] syscall_4294967295(0x1, 0x18935730, 0, 0, 0, 0xff <unfinished
> ...>
> [pid 17144] <... clock_gettime resumed> {4156106598139125789, 17314723865})
> = 0
> [pid 17148] <... syscall_4294967295 resumed> ) = -1 (errno 1)4294967295 is (unsigned int) -1. Looks like a side effect from a seccomp filter that messes up with syscalls. Try strace -fveseccomp,prctl to check this hypothesis. -- ldv
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