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Timeouts sometimes not fired on Linux/ARM #2326

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Timeouts sometimes not fired on Linux/ARM#2326
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armIssues and PRs related to the ARM architecture.timersIssues and PRs related to timers, setImmediate(), setInterval(), and setTimeout().

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@snorp
snorp
opened on Aug 7, 2015

I'm having a problem where long (1 hour) timeouts registered via setTimeout() are not fired if the process has been idle for a while. If I then trigger some I/O by loading a page, the past-due timeout is immediately fired. Inspecting with gdb while in this 'hung' state shows that it's sitting in epoll_pwait():

#0  syscall () at ../ports/sysdeps/unix/sysv/linux/arm/syscall.S:38
#1  0x0085c790 in uv__epoll_pwait (epfd=<optimized out>, events=events@entry=0xbec35b40, nevents=nevents@entry=1024, timeout=timeout@entry=1789569, sigmask=sigmask@entry=67108864) at ../deps/uv/src/unix/linux-syscalls.c:340
#2  0x0085b2a6 in uv__io_poll (loop=loop@entry=0xa97510 <default_loop_struct>, timeout=1789569) at ../deps/uv/src/unix/linux-core.c:235
#3  0x0085189e in uv_run (loop=0xa97510 <default_loop_struct>, mode=UV_RUN_ONCE) at ../deps/uv/src/unix/core.c:328
#4  0x008009b0 in node::Start(int, char**) ()
#5  0xb6d2f632 in __libc_start_main (main=0x26cb09 <main>, argc=2, argv=0xbec39d84, init=<optimized out>, fini=0x864999 <__libc_csu_fini>, rtld_fini=0xb6f7c4c5 <_dl_fini>, stack_end=0xbec39d84) at libc-start.c:287
#6  0x0026ccfa in _start ()

I don't know if epoll_pwait() is exceeding/ignoring the timeout or what. Will do some more digging. This is running on a BeagleBone Black under Ubuntu Trusty, kernel 3.14.

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