On 5/14/20 8:34 PM, Jan Gorecki wrote:
Hi R developers,
I observed that system(timeout=) may still return exit code 0, when
killing the process due to timeout.
In src/unix/sys-unix.c there is
#define KILL_SIGNAL1 SIGINT
#define KILL_SIGNAL2 SIGTERM
#define KILL_SIGNAL3 SIGKILL
#define EMERGENCY_TIMEOUT 20
After little bit of debugging I observed that total time of system
call is provided timeout value + 20s. That means EMERGENCY_TIMEOUT 20
kicked in, adding 20 seconds.
I don't have a reproducible example, but following code, and output
file below should be enough to ensure that there is a problem there
(exit code 0 despite timeout).
Thanks for the report, but I can't tell from the report what the problem
is, I would really need a reproducible example, and ideally one that
uses only minimal/trivial child processes. I tried with such examples on
my system, but they did not trigger the problem.
In this example, SIGINT succeeds in terminating the child process
> system.time(print(system("while /bin/true ; do /bin/true ; done",
timeout=1)))
[1] 124
user system elapsed
0.712 0.316 1.002
In this example, SIGTERM succeeds (after additional 20s)
> system.time(print(system("trap '' INT ; while /bin/true ; do
/bin/true ; done", timeout=1)))
[1] 124
user system elapsed
14.813 6.641 21.002
In this example, SIGKILL succeeds (after additional 40s)
> system.time(print(system("trap '' INT TERM ; while /bin/true ; do
/bin/true ; done", timeout=1)))
[1] 124
user system elapsed
29.075 12.918 41.002
In these examples, the execution time and the exit status is as
documented in ?system.
Best
Tomas
warn = NULL
p = proc.time()[[3L]]
tryCatch(
ret <- system(cmd, timeout=timeout_s),
warning = function(w) {
warn <<- w[["message"]]
}
)
if (length(warn) && ret==0L)
cat(sprintf("command '%s' timed out(?) but still exited with 0 code,
timeout %ss, took %ss, warning '%s'\n",
cmd, timeout_s, proc.time()[[3L]]-p, warn),
file="timeout-exit-codes.out", append=TRUE)
And the content of timeout-exit-codes.out:
command '/bin/bash -c "./_launcher/solution.R > log.out 2> log.err"'
timed out(?) but still exited with 0 code, timeout 7200s, took
7220.005s, warning '/bin/bash -c "./_launcher/solution.R > log.out 2>
log.err"' timed out after 7200s'
Thank you,
Jan Gorecki
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