From: "Yeung, Jeffrey" <Jeffrey.Yeung@polycom.com>
To: Eric Wong <normalperson@yhbt.net>,
unicorn list <mongrel-unicorn@rubyforge.org>
Subject: RE: Unicorn_rails ignores USR2 signal
Date: Fri, 9 Mar 2012 14:39:38 -0800 [thread overview]
Message-ID: <E8D9E7CCC2621343A0A3BB45E8DEDFA91C6738D5B7@CRPMBOXPRD04.polycom.com> (raw)
In-Reply-To: <20120309222412.GA21753@dcvr.yhbt.net>
Thanks Eric. New strace capture as follows:
$ sudo strace -f -e '!futex' -p 14255
Process 14255 attached with 12 threads - interrupt to quit
[pid 14322] restart_syscall(<... resuming interrupted call ...> <unfinished ...>
[pid 14271] restart_syscall(<... resuming interrupted call ...> <unfinished ...>
[pid 14267] accept(12, <unfinished ...>
[pid 14264] restart_syscall(<... resuming interrupted call ...> <unfinished ...>
[pid 14255] select(6, [5], NULL, NULL, {42, 86504} <unfinished ...>
[pid 14322] <... restart_syscall resumed> ) = -1 ETIMEDOUT (Connection timed out)
[pid 14271] <... restart_syscall resumed> ) = -1 ETIMEDOUT (Connection timed out)
[pid 14264] <... restart_syscall resumed> ) = -1 ETIMEDOUT (Connection timed out)
[pid 14262] --- SIGUSR2 (User defined signal 2) @ 0 (0) ---
[pid 14262] rt_sigreturn(0x20) = 202
The last two lines do not say much for the event. :(
-----Original Message-----
From: Eric Wong [mailto:normalperson@yhbt.net]
Sent: Friday, March 09, 2012 2:24 PM
To: unicorn list
Cc: Yeung, Jeffrey
Subject: Re: Unicorn_rails ignores USR2 signal
"Yeung, Jeffrey" <Jeffrey.Yeung@polycom.com> wrote:
> $ ruby -v
> ruby 1.9.1p376 (2009-12-07 revision 26041) [x86_64-linux]
>
> The Rails gem version is 2.3.14. Unicorn gem version 4.2.0.
> I have done my best to debug it using strace and the stderr logs. The
> unicorn_rails master process handles HUP, QUIT, and USR1 signals as
> expected, no problems. However, the USR2 signal is being completely
> ignored.
> While monitoring the master with strace, there are no calls observed
> when sending a kill -USR2. Nothing is logged to STDERR when sending
> this signal, either.
Really strange, especially since other signals seem to work...
Since you're on Ruby (>= 1.9.0 && < 1.9.3), are you stracing with -f?
If you're not already, try using: strace -f -e '!futex'
1.9.x versions use a dedicated timer thread to accept signals, so you won't see system signal handlers in the VM without "strace -f".
The "-e '!futex'" filters out the noise from the polling wakeup in
<1.9.3 versions of Ruby.
Can you try Ruby 1.9.3? The signal handling got completely reworked (for the better) and you won't need "-e '!futex'"
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next prev parent reply other threads:[~2012-03-09 23:22 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-09 21:48 Unicorn_rails ignores USR2 signal Yeung, Jeffrey
2012-03-09 22:24 ` Eric Wong
2012-03-09 22:39 ` Yeung, Jeffrey [this message]
2012-03-10 0:02 ` Eric Wong
2012-03-10 1:07 ` Yeung, Jeffrey
2012-03-10 1:30 ` Eric Wong
2012-03-12 21:21 ` Eric Wong
2012-03-12 22:39 ` Yeung, Jeffrey
2012-03-12 22:44 ` Eric Wong
2012-03-20 19:57 ` Eric Wong
2012-03-20 23:09 ` Yeung, Jeffrey
2012-03-21 2:27 ` Devin Ben-Hur
2012-03-30 22:16 ` Yeung, Jeffrey
2012-03-30 22:51 ` Alex Sharp
2013-05-08 18:15 ` Ryan Jones (RyanonRails)
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