Tracing root cause for R segfault - r

Question

I'm working on a quite complicated dashboard written in R using Shiny and ggplot2.
At the moment it was written everything worked fine, but after some time (data is updated daily) it started to segfault while rendering specific pages.
I can reproduce the problem by opening specific tab with 12 ggplot graphs.
Console output at the moment of failure looks like this:
dashboard_1 | address 0x194b1, cause 'memory not mapped'
dashboard_1 |
dashboard_1 | Traceback:
dashboard_1 | 1: mapply(FUN = f, ..., SIMPLIFY = FALSE)
dashboard_1 | 2: Map(build_grob, plot$layer, data)
dashboard_1 | 3: ggplot_gtable(data)
dashboard_1 | 4: print.ggplot(result$value)
dashboard_1 | 5: print(result$value)
dashboard_1 | 6: eval(expr, envir, enclos)
dashboard_1 | 7: eval(expr, pf)
dashboard_1 | 8: withVisible(eval(expr, pf))
dashboard_1 | 9: evalVis(expr)
dashboard_1 | 10: capture.output(print(result$value))
...
dashboard_1 | 65: tryCatchOne(expr, names, parentenv, handlers[[1L]])
dashboard_1 | 66: tryCatchList(expr, classes, parentenv, handlers)
dashboard_1 | 67: tryCatch(evalq((function (handle, binary, message) { for (handler in .wsconns[[as.character(handle)]]$.messageCallbacks) { result <- try(handler(binary, message)) if (inherits(result, "try-error")) { .wsconns[[as.character(handle)]]$close() return() } }})("62978544", FALSE, "{\"method\":\"update\",\"data\":{\"daterange:shiny.date\":[\"2014-04-26\",\"2015-04-26\"],\"group_by\":\"weeks\"}}"), <environment>), error = .rcpp_error_recorder)
dashboard_1 | 68: withCallingHandlers(tryCatch(evalq((function (handle, binary, message) { for (handler in .wsconns[[as.character(handle)]]$.messageCallbacks) { result <- try(handler(binary, message)) if (inherits(result, "try-error")) { .wsconns[[as.character(handle)]]$close() return() } }})("62978544", FALSE, "{\"method\":\"update\",\"data\":{\"daterange:shiny.date\":[\"2014-04-26\",\"2015-04-26\"],\"group_by\":\"weeks\"}}"), <environment>), error = .rcpp_error_recorder), warning = .rcpp_warning_recorder)
dashboard_1 | aborting ...
dashboard_1 | Segmentation fault
rmreports_dashboard_1 exited with code 139
I would like to trace the root cause and introduce changes to prevent segfault from happening. What is the best way to approach this problem?

Answer 1

I was searching your problem was able to find this thread. https://github.com/hadley/dplyr/issues/322
Which says to try to update 'dplyr' with 'devtools'.
"devtools::install_github("hadley/dplyr", build_vignettes = FALSE)"