Not sure if helpful but further to my above comment I find that gnome-
system-monitor locks up in a futex() call:
stat64("/proc/2426", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat64("/proc/2427", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat64("/proc/2500", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat64("/proc/2501", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat64("/proc/2506", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
getdents(14, /* 0 entries */, 32768) = 0
close(14) = 0
open("/proc/stat", O_RDONLY) = 14
read(14, "cpu 7326 189 2427 91947 15582 0"..., 8191) = 1787
read(14, "", 6404) = 0
close(14) = 0
stat64("/proc/1707", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
open("/proc/1707/stat", O_RDONLY) = 14
read(14, "1707 (gnome-session) S 1157 1707"..., 8191) = 224
read(14, "", 7967) = 0
close(14) = 0
open("/proc/1707/stat", O_RDONLY) = 14
read(14, "1707 (gnome-session) S 1157 1707"..., 8191) = 224
read(14, "", 7967) = 0
close(14) = 0
open("/proc/1707/cpu", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/proc/1707/cmdline", O_RDONLY|O_LARGEFILE) = 14
fstat64(14, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
fcntl64(14, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE)
fstat64(14, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb3feb000
_llseek(14, 0, [0], SEEK_CUR) = 0
read(14, "/usr/bin/gnome-session\0--session"..., 4096) = 39
read(14, "", 3072) = 0
close(14) = 0
munmap(0xb3feb000, 4096) = 0
open("/proc/1707/attr/current", O_RDONLY|O_LARGEFILE) = 14
read(14, "unconfined\n", 4095) = 11
close(14) = 0
futex(0xb62c8b64, FUTEX_WAKE_PRIVATE, 2147483647) = 0
Sits on last line above at 100% cpu.
If I run transmission-gtk under strace then it won't fail but if I run
it normally and then attach strace after it locks up, then it is also
sitting on a futex() call at 100% cpu (although in this case it also
hangs my gnome-shell session).
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https://bugs.launchpad.net/bugs/881955
Title:
System monitor freezes up when switching to Processes tab
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