#13707: xmobar crashes with segmentation faults? -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.2.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by trippels): Not sure if it matters, but I built the latest xmobar git tree with -O2. {{{ ~ % cat .xmobarrc Config { font = "xft:Consolas:size=8" , bgColor = "#fafafa" , fgColor = "#606060" , position = BottomSize C 100 0 , lowerOnStart = True , hideOnStart = False , persistent = False , commands = [ Run Weather "EDDT" ["-t","<tempC>°C <rh>%"] 18000 , Run Network "eth0" ["-t","<rx> <tx>","-w","4"] 10 , Run Cpu ["-t","<total>%","-L","3","-H","50","-- normal","blue","--high","red"] 10 , Run Date "%a %b %_d %H:%M" "date" 10 , Run Com "/home/markus/cputemp" [] "temp" 100 , Run Com "/home/markus/loadav" [] "loadav" 100 , Run StdinReader ] , sepChar = "%" , alignSep = "}{" , template = "%StdinReader% }{%cpu% | %loadav% | %temp%°C | %eth0% | %EDDT% | %date%" } }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13707#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#13707: xmobar crashes with segmentation faults? -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.2.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by trippels): Also happens when build with -O1. Unfortunately, it can take several hours to hit the crash. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13707#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#13707: xmobar crashes with segmentation faults? -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.2.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by trippels): {{{ markus@x4 xmobar % cabal install --flags="with_xft with_utf8" --dry-run --allow-newer Resolving dependencies... In order, the following would be installed (use -v for more details): data-default-class-0.1.2.0 data-default-instances-containers-0.0.1 dlist-0.8.0.2 data-default-instances-dlist-0.0.1 mtl-2.2.1 network-2.6.3.1 old-locale-1.0.0.7 data-default-instances-old-locale-0.0.1 data-default-0.7.1.1 X11-1.8 regex-base-0.93.2 regex-posix-0.95.2 regex-compat-0.95.1 stm-2.4.4.1 text-1.2.2.1 parsec-3.1.11 network-uri-2.6.1.0 HTTP-4000.3.6 utf8-string-1.0.1.1 X11-xft-0.3.1 xmobar-0.24.4 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13707#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#13707: xmobar crashes with segmentation faults? -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.2.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by trippels): Sorry, but I've switched back to 8.0.2 and everything works fine again. The xmobar binary is too big to attach (even compressed). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13707#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#13707: xmobar crashes with segmentation faults? -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: infoneeded Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.2.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by trippels): Core dumps are disabled on my machine. And I have deleted the old crashing xmobar binary. Sorry, but I will not debug this any further and will just stay on 8.0.2 for the future. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13707#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#13707: xmobar crashes with segmentation faults? -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: infoneeded Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.2.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by rezb1t): * Attachment "xmobar.coredump.xz" added. xmobar coredump after segfault, with GHC 8.2.1 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13707 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#13707: xmobar crashes with segmentation faults? -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: infoneeded Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.2.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Emantor): Hello, I just produced an unstripped version of xmobar, here is the coredump from coredumpctl. Unfortunately it is bigger than the allowed upload limit, you can download it [https://magratgarlick.emantor.de/xmobar_dump.xz here]. I also built a version with the configure option `--with-debug-info=1`, weirdly I could not reproduce the crashes with that binary. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13707#comment:14 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#13707: xmobar crashes with segmentation faults? -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.2.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): Do you think you could include the executable as well? Unfortunately it's hard to do much with the coredump without at least the symbol table. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13707#comment:16 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#13707: xmobar crashes with segmentation faults? -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.2.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Rufflewind): The crash is quite rare and sporadic. I've had it run for 1-3 days without crashing. GDB: {{{ 0x7ffff55ffcdd or rdx,rcx

0x7ffff55ffce0 movzx ecx,WORD PTR [rdx+0x2e] 0x7ffff55ffce4 test cx,0x20b

print/x $rdx # variable "bd" 0x6300000000

backtrace #0 evacuate (p=p@entry=0x4200266b98) at rts/sm/Evac.c:583 #1 0x00007ffff55ff155 in scavenge_block (bd=0x4200201980) at rts/sm/Scav.c:548 #2 0x00007ffff561495e in scavenge_find_work () at rts/sm/Scav.c:2132 #3 scavenge_loop () at rts/sm/Scav.c:2195 #4 0x00007ffff561b08f in scavenge_until_all_done () at rts/sm/GC.c:1020 #5 GarbageCollect (collect_gen=collect_gen@entry=1, do_heap_census=do_heap_census@entry=false, gc_type=gc_type@entry=0, cap=cap@entry=0x7ffff5648a00 <MainCapability>, idle_cap=idle_cap@entry=0x0) at rts/sm/GC.c:406 #6 0x00007ffff560da3d in scheduleDoGC (pcap=pcap@entry=0x7fffffffdba8, task=task@entry=0x5c28d0, force_major=force_major@entry=false) at rts/Schedule.c:1822 #7 0x00007ffff560e6fb in schedule (task=0x5c28d0, initialCapability=<optimized out>) at rts/Schedule.c:558 #8 scheduleWaitThread (tso=<optimized out>, ret=ret@entry=0x0, pcap=pcap@entry=0x7fffffffdc08) at rts/Schedule.c:2551 #9 0x00007ffff560fed8 in rts_evalLazyIO (cap=cap@entry=0x7fffffffdc08, p=p@entry=0x5ad4a0, ret=ret@entry=0x0) at rts/RtsAPI.c:530 #10 0x00007ffff561086e in hs_main (argc=1, argv=0x7fffffffddd8, main_closure=0x5ad4a0, rts_config=...) at rts/RtsMain.c:64 #11 0x0000000000578fe1 in main () }}}

Built using GHC from https://downloads.haskell.org/~ghc/8.2.1/ghc-8.2.1-x86_64-deb8-linux.tar.xz installed on Arch Linux with ncurses5-compat-libs. xmobar was built with: {{{ cabal install --disable-executable-stripping --with- ghc=/opt/ghc-8.2.1/bin/ghc \ -f 'with_utf8 with_xft with_iwlib with_xpm with_inotify' constraints: HTTP ==4000.3.7, X11 ==1.8, array ==0.5.2.0, base ==4.10.0.0, binary ==0.8.5.1, bytestring ==0.10.8.2, containers ==0.5.10.2, data-default ==0.7.1.1, data-default-class ==0.1.2.0, data-default-instances-containers ==0.0.1, data-default-instances-dlist ==0.0.1, data-default-instances-old-locale ==0.0.1, deepseq ==1.4.3.0, directory ==1.3.0.2, dlist ==0.8.0.3, filepath ==1.4.1.2, ghc-prim ==0.5.1.0, integer-gmp ==1.0.1.0, mtl ==2.2.1, network ==2.6.3.2, network-uri ==2.6.1.0, old-locale ==1.0.0.7, parsec ==3.1.11, process ==1.6.1.0, regex-base ==0.93.2, regex-compat ==0.95.1, regex-posix ==0.95.2, rts ==1.0, stm ==2.4.4.1, text ==1.2.2.2, time ==1.8.0.2, transformers ==0.5.2.0, unix ==2.7.2.2, utf8-string ==1.0.1.1 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13707#comment:18 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#13707: xmobar crashes with segmentation faults? -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.2.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): Sadly I can't get a backtrace out of the coredump even with the executable. However, the dump in comment:17 is quite interesting as it implicates the `Eq Module` instance in `GHC.Classes`. Unfortunately this is much different from the crash seen in comment:18. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13707#comment:20 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#13707: xmobar crashes with segmentation faults? -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.2.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): Thanks Rufflewind; I left an `xmobar` instance running in the background all of last week but sadly I still have yet to see a crash. I'll try your reproducer shortly. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13707#comment:22 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#13707: xmobar crashes with segmentation faults? -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.2.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): I wonder if any of the number of correctness fixes that we have merged recently will address this. Particularly I wonder about #14361. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13707#comment:24 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler