I'm running emacs 26.2 RC1 compiled with debugging features on Debian 8 Jessie 64bit. Sometimes the Emacs GUI will freeze and all the buffers will go black. I've tried hitting C-g a number of times and ESC but it doesn't listen. It freezes now about once a day, sometimes twice. It seems to freeze more when I run the GUI Emacs over X2go (within XFCE or using EXWM).
It froze today and I got some information from the frozen process.
prtstat output
: prtstat <Emacs PID>
output
: Process: gdb State: S (sleeping)
: CPU#: 2 TTY: 0:0 Threads: 1
: Process, Group and Session IDs
: Process ID: 31419 Parent ID: 30824
: Group ID: 30667 Session ID: 30667
: T Group ID: -1
:
: Page Faults
: This Process (minor major): 815094 0
: Child Processes (minor major): 6942 0
: CPU Times
: This Process (user system guest blkio): 19.14 57.47 0.00 0.00
: Child processes (user system guest): 0.05 0.00 0.00
: Memory
: Vsize: 120 MB
: RSS: 83 MB RSS Limit: 18446744073709 MB
: Code Start: 0x400000 Code Stop: 0x973954
: Stack Start: 0x7ffe02196e70
: Stack Pointer (ESP): 0 Inst Pointer (EIP): 0
: Scheduling
: Policy: normal
: Nice: 0 RT Priority: 0 (non RT)
lsof output
: lsof -a -p <Emacs PID>
: COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
: gdb 31419 map7 cwd DIR 253,1 28672 12189697 /home/map7
: gdb 31419 map7 rtd DIR 253,0 4096 2 /
: gdb 31419 map7 txt REG 253,0 5797744 1322903 /usr/bin/gdb
: gdb 31419 map7 mem REG 253,0 78392 1841863 /usr/lib/debug/lib/x86_64-linux-gnu/libnss_dns-2.19.so
: gdb 31419 map7 mem REG 253,0 668568 1841847 /usr/lib/debug/lib/x86_64-linux-gnu/libpthread-2.19.so
: gdb 31419 map7 mem REG 253,0 1202056 916102 /usr/lib/x86_64-linux-gnu/libgnutls-deb0.so.28.43.4
: gdb 31419 map7 mem REG 253,0 248824 915814 /usr/lib/x86_64-linux-gnu/libfontconfig.so.1.8.0
: gdb 31419 map7 mem REG 253,0 696008 917107 /usr/lib/x86_64-linux-gnu/libfreetype.so.6.11.1
: gdb 31419 map7 mem REG 253,0 1465816 916615 /usr/lib/x86_64-linux-gnu/libxml2.so.2.9.1
: gdb 31419 map7 mem REG 253,0 294792 523534 /lib/x86_64-linux-gnu/libdbus-1.so.3.8.14
: gdb 31419 map7 mem REG 253,0 2747976 916834 /usr/lib/x86_64-linux-gnu/libMagickCore-6.Q16.so.2.0.0
: gdb 31419 map7 mem REG 253,0 1205824 916884 /usr/lib/x86_64-linux-gnu/libMagickWand-6.Q16.so.2.0.0
: gdb 31419 map7 mem REG 253,0 1051056 523348 /lib/x86_64-linux-gnu/libm-2.19.so
: gdb 31419 map7 mem REG 253,0 225992 916275 /usr/lib/x86_64-linux-gnu/librsvg-2.so.2.40.5
: gdb 31419 map7 mem REG 253,0 1015952 926835 /usr/lib/x86_64-linux-gnu/libasound.so.2.0.0
: gdb 31419 map7 mem REG 253,0 138016 917854 /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0
: gdb 31419 map7 mem REG 253,0 1319088 916547 /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0
: gdb 31419 map7 mem REG 253,0 1107040 551691 /lib/x86_64-linux-gnu/libglib-2.0.so.0.4200.1
: gdb 31419 map7 mem REG 253,0 339064 918017 /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.4200.1
: gdb 31419 map7 mem REG 253,0 1541864 921939 /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.4200.1
: gdb 31419 map7 mem REG 253,0 1131984 925746 /usr/lib/x86_64-linux-gnu/libcairo.so.2.11400.0
: gdb 31419 map7 mem REG 253,0 159352 925800 /usr/lib/x86_64-linux-gnu/libatk-1.0.so.0.21409.1
: gdb 31419 map7 mem REG 253,0 319832 916164 /usr/lib/x86_64-linux-gnu/libpango-1.0.so.0.3600.8
: gdb 31419 map7 mem REG 253,0 763224 925831 /usr/lib/x86_64-linux-gnu/libgdk-3.so.0.1400.5
: gdb 31419 map7 mem REG 253,0 7031592 925830 /usr/lib/x86_64-linux-gnu/libgtk-3.so.0.1400.5
: gdb 31419 map7 mem REG 253,0 238848 933899 /usr/lib/x86_64-linux-gnu/libjpeg.so.8.4.0
: gdb 31419 map7 mem REG 253,0 420408 917154 /usr/lib/x86_64-linux-gnu/libtiff.so.4.3.6
: gdb 31419 map7 mem REG 253,0 216024 1841864 /usr/lib/debug/lib/x86_64-linux-gnu/libnss_files-2.19.so
: gdb 31419 map7 mem REG 253,0 200560 1841866 /usr/lib/debug/lib/x86_64-linux-gnu/libnss_nis-2.19.so
: gdb 31419 map7 mem REG 253,0 486256 1841861 /usr/lib/debug/lib/x86_64-linux-gnu/libnsl-2.19.so
: gdb 31419 map7 mem REG 253,0 113072 1841862 /usr/lib/debug/lib/x86_64-linux-gnu/libnss_compat-2.19.so
: gdb 31419 map7 mem REG 253,0 304544 1841869 /usr/lib/debug/lib/x86_64-linux-gnu/libresolv-2.19.so
: gdb 31419 map7 mem REG 253,0 8371680 1841855 /usr/lib/debug/lib/x86_64-linux-gnu/libc-2.19.so
: gdb 31419 map7 mem REG 253,0 31544 523387 /lib/x86_64-linux-gnu/libthread_db-1.0.so
: gdb 31419 map7 mem REG 253,0 85232 1841858 /usr/lib/debug/lib/x86_64-linux-gnu/libdl-2.19.so
: gdb 31419 map7 mem REG 253,0 60256 1841853 /usr/lib/debug/lib/x86_64-linux-gnu/libanl-2.19.so
: gdb 31419 map7 mem REG 253,0 142624 1841870 /usr/lib/debug/lib/x86_64-linux-gnu/librt-2.19.so
: gdb 31419 map7 mem REG 253,0 2300072 1841859 /usr/lib/debug/lib/x86_64-linux-gnu/libm-2.19.so
: gdb 31419 map7 mem REG 253,0 32643464 2519259 /opt/emacs-26.1.91/bin/emacs-26.1.91
: gdb 31419 map7 mem REG 253,0 681488 1841852 /usr/lib/debug/lib/x86_64-linux-gnu/ld-2.19.so
: gdb 31419 map7 mem REG 253,0 1738176 523327 /lib/x86_64-linux-gnu/libc-2.19.so
: gdb 31419 map7 mem REG 253,0 141752 523933 /lib/x86_64-linux-gnu/liblzma.so.5.0.0
: gdb 31419 map7 mem REG 253,0 165856 523939 /lib/x86_64-linux-gnu/libexpat.so.1.6.0
: gdb 31419 map7 mem REG 253,0 10680 523390 /lib/x86_64-linux-gnu/libutil-2.19.so
: gdb 31419 map7 mem REG 253,0 137384 523316 /lib/x86_64-linux-gnu/libpthread-2.19.so
: gdb 31419 map7 mem REG 253,0 3614896 916223 /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
: gdb 31419 map7 mem REG 253,0 109144 523602 /lib/x86_64-linux-gnu/libz.so.1.2.8
: gdb 31419 map7 mem REG 253,0 171800 523303 /lib/x86_64-linux-gnu/libtinfo.so.5.9
: gdb 31419 map7 mem REG 253,0 151120 523917 /lib/x86_64-linux-gnu/libncurses.so.5.9
: gdb 31419 map7 mem REG 253,0 14664 523339 /lib/x86_64-linux-gnu/libdl-2.19.so
: gdb 31419 map7 mem REG 253,0 297040 523411 /lib/x86_64-linux-gnu/libreadline.so.6.3
: gdb 31419 map7 mem REG 253,0 140928 523322 /lib/x86_64-linux-gnu/ld-2.19.so
: gdb 31419 map7 0r CHR 1,3 0t0 9218 /dev/null
: gdb 31419 map7 1w REG 253,1 1593 12189907 /home/map7/.xsession-x2go-ltsp-errors
: gdb 31419 map7 2w REG 253,1 1593 12189907 /home/map7/.xsession-x2go-ltsp-errors
: gdb 31419 map7 3u unix 0xffff970d36385800 0t0 139550038 socket
: gdb 31419 map7 4u unix 0xffff971cc2633800 0t0 139550039 socket
: gdb 31419 map7 5r FIFO 0,10 0t0 139550040 pipe
: gdb 31419 map7 6w FIFO 0,10 0t0 139550040 pipe
pstack output : pstack
: crawl: Input/output error
strace output when I hit M-x in the frozen emacs. It still seems to be listening and produced the following output. : strace -s 99 -ffp 31419
: Process 31419 attached
: rt_sigsuspend([], 8) = ? ERESTARTNOHAND (To be restarted if no handler)
: --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_TRAPPED, si_pid=31529, si_uid=1000, si_status=SIGIO, si_utime=155, si_stime=422} ---
: rt_sigreturn() = -1 EINTR (Interrupted system call)
: wait4(-1, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGIO}], WNOHANG|__WCLONE, NULL) = 31530
: tkill(31530, SIG_0) = 0
: ptrace(PTRACE_CONT, 31530, 0x1, SIGIO) = 0
: wait4(-1, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGIO}], WNOHANG|__WCLONE, NULL) = 31529
: tkill(31529, SIG_0) = 0
: ptrace(PTRACE_CONT, 31529, 0x1, SIGIO) = 0
: wait4(-1, 0x7ffe021966b4, WNOHANG|__WCLONE, NULL) = 0
: wait4(-1, 0x7ffe021966b4, WNOHANG, NULL) = 0
: open("/proc/31515/status", O_RDONLY|O_CLOEXEC) = 7
: fstat(7, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
: mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fce9b19a000
: read(7, "Name:\temacs\nUmask:\t0002\nState:\tS (sleeping)\nTgid:\t31515\nNgid:\t0\nPid:\t31515\nPPid:\t31419\nTracerPid:\t3"..., 1024) = 1024
: close(7) = 0
: munmap(0x7fce9b19a000, 4096) = 0
: rt_sigsuspend([], 8) = ? ERESTARTNOHAND (To be restarted if no handler)
: --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_TRAPPED, si_pid=31530, si_uid=1000, si_status=SIGIO, si_utime=145, si_stime=422} ---
: rt_sigreturn() = -1 EINTR (Interrupted system call)
: wait4(-1, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGIO}], WNOHANG|__WCLONE, NULL) = 31530
: tkill(31530, SIG_0) = 0
: ptrace(PTRACE_CONT, 31530, 0x1, SIGIO) = 0
: wait4(-1, 0x7ffe021966b4, WNOHANG|__WCLONE, NULL) = 0
: wait4(-1, 0x7ffe021966b4, WNOHANG, NULL) = 0
: open("/proc/31515/status", O_RDONLY|O_CLOEXEC) = 7
: fstat(7, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
: mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fce9b19a000
: read(7, "Name:\temacs\nUmask:\t0002\nState:\tS (sleeping)\nTgid:\t31515\nNgid:\t0\nPid:\t31515\nPPid:\t31419\nTracerPid:\t3"..., 1024) = 1024
: close(7) = 0
: munmap(0x7fce9b19a000, 4096) = 0
: rt_sigsuspend([], 8) = ? ERESTARTNOHAND (To be restarted if no handler)
: --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_TRAPPED, si_pid=31530, si_uid=1000, si_status=SIGIO, si_utime=145, si_stime=422} ---
: rt_sigreturn() = -1 EINTR (Interrupted system call)
: wait4(-1, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGIO}], WNOHANG|__WCLONE, NULL) = 31530
: tkill(31530, SIG_0) = 0
: ptrace(PTRACE_CONT, 31530, 0x1, SIGIO) = 0
: wait4(-1, 0x7ffe021966b4, WNOHANG|__WCLONE, NULL) = 0
: wait4(-1, 0x7ffe021966b4, WNOHANG, NULL) = 0
: open("/proc/31515/status", O_RDONLY|O_CLOEXEC) = 7
: fstat(7, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
: mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fce9b19a000
: read(7, "Name:\temacs\nUmask:\t0002\nState:\tS (sleeping)\nTgid:\t31515\nNgid:\t0\nPid:\t31515\nPPid:\t31419\nTracerPid:\t3"..., 1024) = 1024
: close(7) = 0
: munmap(0x7fce9b19a000, 4096) = 0
: rt_sigsuspend([], 8) = ? ERESTARTNOHAND (To be restarted if no handler)
: --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_TRAPPED, si_pid=31530, si_uid=1000, si_status=SIGIO, si_utime=145, si_stime=422} ---
: rt_sigreturn() = -1 EINTR (Interrupted system call)
: wait4(-1, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGIO}], WNOHANG|__WCLONE, NULL) = 31530
: tkill(31530, SIG_0) = 0
: ptrace(PTRACE_CONT, 31530, 0x1, SIGIO) = 0
: wait4(-1, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGIO}], WNOHANG|__WCLONE, NULL) = 31529
: tkill(31529, SIG_0) = 0
: ptrace(PTRACE_CONT, 31529, 0x1, SIGIO) = 0
: wait4(-1, 0x7ffe021966b4, WNOHANG|__WCLONE, NULL) = 0
: wait4(-1, 0x7ffe021966b4, WNOHANG, NULL) = 0
: open("/proc/31515/status", O_RDONLY|O_CLOEXEC) = 7
: fstat(7, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
: mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fce9b19a000
: read(7, "Name:\temacs\nUmask:\t0002\nState:\tS (sleeping)\nTgid:\t31515\nNgid:\t0\nPid:\t31515\nPPid:\t31419\nTracerPid:\t3"..., 1024) = 1024
: close(7) = 0
: munmap(0x7fce9b19a000, 4096) = 0
: rt_sigsuspend([], 8) = ? ERESTARTNOHAND (To be restarted if no handler)
: --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_TRAPPED, si_pid=31529, si_uid=1000, si_status=SIGIO, si_utime=155, si_stime=422} ---
: rt_sigreturn() = -1 EINTR (Interrupted system call)
: wait4(-1, 0x7ffe021966b4, WNOHANG|__WCLONE, NULL) = 0
: wait4(-1, 0x7ffe021966b4, WNOHANG, NULL) = 0
: open("/proc/31515/status", O_RDONLY|O_CLOEXEC) = 7
: fstat(7, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
: mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fce9b19a000
: read(7, "Name:\temacs\nUmask:\t0002\nState:\tS (sleeping)\nTgid:\t31515\nNgid:\t0\nPid:\t31515\nPPid:\t31419\nTracerPid:\t3"..., 1024) = 1024
: close(7) = 0
: munmap(0x7fce9b19a000, 4096) = 0
: rt_sigsuspend([], 8Process 31419 detached
: <detached ...>
Update
Updated to Emacs 26.2 RC1 from 26.1.91 and it is still crashing (09/04/2019 @ 12:59pm). This time I was trying to open up a remote file. I hit C-g a number of times but it wouldn't unfreeze my display. All the buffers went black except for the vertical and horizontal splits between the buffers. I could still strace to the PID for emacs and if I hit C-g then this would display;
Update
Upgraded from EXWM 0.20 to EXWM 0.22 and I'm testing it out over the next 24hrs to see if it crashes. I'll be working remote tomorrow which is the real test.
Update
Crashed whilst using EXWM 0.22 remotely through x2go. Now testing without EXWM, but still through x2go. Now testing X2go -> XFCE -> with emacs (no exwm installed). Let's see if this crashes.
Update
I've remarked out a lot in my emacs config and compiled emacs 26.2 with no additional options. Today when it froze I was able to use the 'killall -SIGUSR2 emacs' for the first time and it showed a Backtrace buffer with;
Debugger entered--entering a function:
* eldoc-pre-command-refresh-echo-area()
recursive-edit()
debug(lambda)
* blink-cursor-end()
recursive-edit()
debug(lambda)
* blink-cursor-end()
recursive-edit()
debug(lambda)
* magit-pre-command-hook()
I'm now running emacs (GUI) in i3 as a server.
