joueiuqidua

As a follow-up to my previous post, I should note that I have two user accounts on this system (Ubuntu 17.10) and each of them use Enpass. PID 24635 is owned by Alice, but the file noted in the strace output (/tmp/qipc_systemsem_NativeMessagingSharedMemory7803fea57be87205d085c7bf68ef61263349c3d3) is owned by Bob. The permissions on the file are 0640 and the file is owned by bob:bob. The EnpassNMHost process from both users is consuming 100%. From the Bob side of things, we have: GDB: (gdb) thread apply all bt Thread 2 (Thread 0x7fabd4010700 (LWP 27418)): #0 0x00007fabd73dc453 in __GI___libc_free (mem=<optimized out>) at malloc.c:3146 #1 0x000000000040597c in StdinReadWorker::run() () #2 0x00007fabd7f93729 in ?? () from /opt/Enpass/lib/libQt5Core.so.5 #3 0x00007fabd7cd17fc in start_thread (arg=0x7fabd4010700) at pthread_create.c:465 #4 0x00007fabd7461b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 1 (Thread 0x7fabd8d7db80 (LWP 27413)): #0 0x00007fabd7455951 in __GI___poll (fds=0x13577c0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 #1 0x00007fabd42ce169 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #2 0x00007fabd42ce27c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #3 0x00007fabd81a5f07 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /opt/Enpass/lib/libQt5Core.so.5 #4 0x00007fabd815476a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /opt/Enpass/lib/libQt5Core.so.5 #5 0x00007fabd815c5fd in QCoreApplication::exec() () from /opt/Enpass/lib/libQt5Core.so.5 #6 0x0000000000403afc in main () /proc/PID/stack: [<ffffffff9986d5a5>] poll_schedule_timeout+0x45/0x70 [<ffffffff9986e8d0>] do_sys_poll+0x3c0/0x580 [<ffffffff9986ead9>] do_restart_poll+0x49/0x80 [<ffffffff99698b95>] sys_restart_syscall+0x25/0x30 [<ffffffff9a0001a1>] entry_SYSCALL_64_fastpath+0x24/0xab [<ffffffffffffffff>] 0xffffffffffffffff Unfortunately, I can't get any strace output from Bob's process.

I've been encountering the same issue. Since I have a process running now consuming 100% CPU, I thought I'd use some system tools to generate diagnostic output that can hopefully get to the bottom of this. GDB: (gdb) thread apply all bt Thread 2 (Thread 0x7f26d0aa3700 (LWP 24640)): #0 0x00007f26d3ee406d in __GI___libc_read (fd=0, buf=0x7f26cc0051d0, nbytes=4096) at ../sysdeps/unix/sysv/linux/read.c:26 #1 0x00007f26d3e649a0 in _IO_new_file_underflow (fp=0x7f26d41ba9e0 <_IO_2_1_stdin_>) at fileops.c:584 #2 0x00007f26d3e63108 in __GI__IO_file_xsgetn (fp=0x7f26d41ba9e0 <_IO_2_1_stdin_>, data=<optimized out>, n=4) at fileops.c:1406 #3 0x00007f26d3e56f49 in __GI__IO_fread (buf=<optimized out>, size=1, count=4, fp=0x7f26d41ba9e0 <_IO_2_1_stdin_>) at iofread.c:38 #4 0x00007f26d44c545d in __gnu_cxx::stdio_sync_filebuf<char, std::char_traits<char> >::xsgetn(char*, long) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6 #5 0x00007f26d44d3e9b in std::istream::read(char*, long) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6 #6 0x0000000000405880 in StdinReadWorker::run() () #7 0x00007f26d4a26729 in ?? () from /opt/Enpass/lib/libQt5Core.so.5 #8 0x00007f26d47647fc in start_thread (arg=0x7f26d0aa3700) at pthread_create.c:465 #9 0x00007f26d3ef4b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 1 (Thread 0x7f26d5810b80 (LWP 24635)): #0 0x00007f26d3ee8951 in __GI___poll (fds=0xab97c0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 #1 0x00007f26d0d61169 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #2 0x00007f26d0d6127c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #3 0x00007f26d4c38f07 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /opt/Enpass/lib/libQt5Core.so.5 #4 0x00007f26d4be776a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /opt/Enpass/lib/libQt5Core.so.5 #5 0x00007f26d4bef5fd in QCoreApplication::exec() () from /opt/Enpass/lib/libQt5Core.so.5 #6 0x0000000000403afc in main () strace: > sudo strace -s 99 -ffp 24635 strace: Process 24635 attached with 2 threads [pid 24640] read(0, <unfinished ...> [pid 24635] restart_syscall(<... resuming interrupted restart_syscall ...> <unfinished ...> [pid 24640] <... read resumed> ".\0\0\0", 4096) = 4 [pid 24640] read(0, "\"9nL/2uue2i/ApyvQklTLkE5a1ufk65/RiDhuxovtCpE=\"", 4096) = 46 [pid 24640] write(4, "\1\0\0\0\0\0\0\0", 8) = 8 [pid 24635] <... restart_syscall resumed> ) = 1 [pid 24640] read(0, <unfinished ...> [pid 24635] read(4, "\1\0\0\0\0\0\0\0", 16) = 8 [pid 24635] getppid() = 24308 [pid 24635] write(4, "\1\0\0\0\0\0\0\0", 8) = 8 [pid 24635] openat(AT_FDCWD, "/tmp/qipc_systemsem_NativeMessagingSharedMemory7803fea57be87205d085c7bf68ef61263349c3d3", O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC, 0640) = -1 EEXIST (File exists) [pid 24635] stat("/tmp/qipc_systemsem_NativeMessagingSharedMemory7803fea57be87205d085c7bf68ef61263349c3d3", {st_mode=S_IFREG|0640, st_size=0, ...}) = 0 [pid 24635] semget(0x731919b6, 1, IPC_CREAT|IPC_EXCL|0600) = -1 EEXIST (File exists) [pid 24635] semget(0x731919b6, 1, IPC_CREAT|0600) = -1 EACCES (Permission denied) [pid 24635] write(1, "\202\0\0\0\"wXLrXGGjLYpNIlPpwZKhF+GPQ7UnKiY8dLjSK7y0j8ttejcOHlUmvq2ptzA6qlVuIv34+Ebzrt+hTTwhy0C0Ym8PwKh1Mv"..., 134) = 134 [pid 24635] write(4, "\1\0\0\0\0\0\0\0", 8) = 8 [pid 24635] poll([{fd=4, events=POLLIN}], 1, 0) = 1 ([{fd=4, revents=POLLIN}]) [pid 24635] read(4, "\2\0\0\0\0\0\0\0", 16) = 8 [pid 24635] poll([{fd=4, events=POLLIN}], 1, -1 <unfinished ...> [pid 24640] <... read resumed> ".\0\0\0", 4096) = 4 [pid 24640] read(0, "\"9nL/2uue2i/ApyvQklTLkE5a1ufk65/RiDhuxovtCpE=\"", 4096) = 46 [pid 24640] write(4, "\1\0\0\0\0\0\0\0", 8) = 8 [pid 24635] <... poll resumed> ) = 1 ([{fd=4, revents=POLLIN}]) [pid 24640] read(0, <unfinished ...> [pid 24635] read(4, "\1\0\0\0\0\0\0\0", 16) = 8 [pid 24635] getppid() = 24308 [pid 24635] write(4, "\1\0\0\0\0\0\0\0", 8) = 8 [pid 24635] openat(AT_FDCWD, "/tmp/qipc_systemsem_NativeMessagingSharedMemory7803fea57be87205d085c7bf68ef61263349c3d3", O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC, 0640) = -1 EEXIST (File exists) [pid 24635] stat("/tmp/qipc_systemsem_NativeMessagingSharedMemory7803fea57be87205d085c7bf68ef61263349c3d3", {st_mode=S_IFREG|0640, st_size=0, ...}) = 0 [pid 24635] semget(0x731919b6, 1, IPC_CREAT|IPC_EXCL|0600) = -1 EEXIST (File exists) [pid 24635] semget(0x731919b6, 1, IPC_CREAT|0600) = -1 EACCES (Permission denied) [pid 24635] write(1, "\202\0\0\0\"wXLrXGGjLYpNIlPpwZKhF+GPQ7UnKiY8dLjSK7y0j8ttejcOHlUmvq2ptzA6qlVuIv34+Ebzrt+hTTwhy0C0Ym8PwKh1Mv"..., 134) = 134 [pid 24635] write(4, "\1\0\0\0\0\0\0\0", 8) = 8 [pid 24635] poll([{fd=4, events=POLLIN}], 1, 0) = 1 ([{fd=4, revents=POLLIN}]) [pid 24635] read(4, "\2\0\0\0\0\0\0\0", 16) = 8 [pid 24635] poll([{fd=4, events=POLLIN}], 1, -1 <unfinished ...> [pid 24640] <... read resumed> ".\0\0\0", 4096) = 4 [pid 24640] read(0, "\"9nL/2uue2i/ApyvQklTLkE5a1ufk65/RiDhuxovtCpE=\"", 4096) = 46 [pid 24640] write(4, "\1\0\0\0\0\0\0\0", 8) = 8 [pid 24635] <... poll resumed> ) = 1 ([{fd=4, revents=POLLIN}]) [pid 24640] read(0, <unfinished ...> [pid 24635] read(4, "\1\0\0\0\0\0\0\0", 16) = 8 [pid 24635] getppid() = 24308 [pid 24635] write(4, "\1\0\0\0\0\0\0\0", 8) = 8 [pid 24635] openat(AT_FDCWD, "/tmp/qipc_systemsem_NativeMessagingSharedMemory7803fea57be87205d085c7bf68ef61263349c3d3", O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC, 0640) = -1 EEXIST (File exists) [pid 24635] stat("/tmp/qipc_systemsem_NativeMessagingSharedMemory7803fea57be87205d085c7bf68ef61263349c3d3", {st_mode=S_IFREG|0640, st_size=0, ...}) = 0 [pid 24635] semget(0x731919b6, 1, IPC_CREAT|IPC_EXCL|0600) = -1 EEXIST (File exists) [pid 24635] semget(0x731919b6, 1, IPC_CREAT|0600) = -1 EACCES (Permission denied) [pid 24635] write(1, "\202\0\0\0\"wXLrXGGjLYpNIlPpwZKhF+GPQ7UnKiY8dLjSK7y0j8ttejcOHlUmvq2ptzA6qlVuIv34+Ebzrt+hTTwhy0C0Ym8PwKh1Mv"..., 134) = 134 [pid 24635] write(4, "\1\0\0\0\0\0\0\0", 8) = 8 [pid 24635] poll([{fd=4, events=POLLIN}], 1, 0) = 1 ([{fd=4, revents=POLLIN}]) [pid 24635] read(4, "\2\0\0\0\0\0\0\0", 16) = 8 [pid 24635] poll([{fd=4, events=POLLIN}], 1, -1 <unfinished ...> [pid 24640] <... read resumed> ".\0\0\0", 4096) = 4 [pid 24640] read(0, "\"9nL/2uue2i/ApyvQklTLkE5a1ufk65/RiDhuxovtCpE=\"", 4096) = 46 [pid 24640] write(4, "\1\0\0\0\0\0\0\0", 8) = 8 [pid 24635] <... poll resumed> ) = 1 ([{fd=4, revents=POLLIN}]) [pid 24640] read(0, <unfinished ...> [pid 24635] read(4, "\1\0\0\0\0\0\0\0", 16) = 8 [pid 24635] getppid() = 24308 [pid 24635] write(4, "\1\0\0\0\0\0\0\0", 8) = 8 [pid 24635] openat(AT_FDCWD, "/tmp/qipc_systemsem_NativeMessagingSharedMemory7803fea57be87205d085c7bf68ef61263349c3d3", O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC, 0640) = -1 EEXIST (File exists) [pid 24635] stat("/tmp/qipc_systemsem_NativeMessagingSharedMemory7803fea57be87205d085c7bf68ef61263349c3d3", {st_mode=S_IFREG|0640, st_size=0, ...}) = 0 [pid 24635] semget(0x731919b6, 1, IPC_CREAT|IPC_EXCL|0600) = -1 EEXIST (File exists) [pid 24635] semget(0x731919b6, 1, IPC_CREAT|0600) = -1 EACCES (Permission denied) /proc/PID/stack: [<ffffffff9986d5a5>] poll_schedule_timeout+0x45/0x70 [<ffffffff9986e8d0>] do_sys_poll+0x3c0/0x580 [<ffffffff9986ead9>] do_restart_poll+0x49/0x80 [<ffffffff99698b95>] sys_restart_syscall+0x25/0x30 [<ffffffff99603ad7>] do_syscall_64+0x67/0x130 [<ffffffff9a00024d>] entry_SYSCALL64_slow_path+0x25/0x25 [<ffffffffffffffff>] 0xffffffffffffffff