iusearch
commented
1 year ago One thing I noticed from strace log
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[PIPE], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f7d0cebd090}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
ioctl(1, TCGETS, {B38400 opost isig icanon echo ...}) = 0
rt_sigaction(SIGWINCH, {sa_handler=0x7f7d0d48bf60, sa_mask=[WINCH], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f7d0cebd090}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
ioctl(1, TIOCGWINSZ, {ws_row=34, ws_col=135, ws_xpixel=1221, ws_ypixel=682}) = 0
ioctl(1, TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(1, TCGETS, {B38400 opost isig icanon echo ...}) = 0
stat("/etc/apt/sources.list", {st_mode=S_IFREG|0644, st_size=2785, ...}) = 0
openat(AT_FDCWD, "/etc/apt/sources.list", O_RDONLY|O_NOCTTY|O_CLOEXEC) = 4
read(4, "# See http://help.ubuntu.com/com"..., 4096) = 2785
read(4, "", 1311) = 0
openat(AT_FDCWD, "/var/lib/apt/lists/", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 5
fstat(5, {st_mode=S_IFDIR|0755, st_size=12288, ...}) = 0
getdents64(5, /* 66 entries */, 32768) = 5904
getdents64(5, /* 0 entries */, 32768) = 0
close(5) = 0
pipe([5, 6]) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD) = ? <unavailable>This is with kv on. You can see strace is stucking on clone, while without kv
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[PIPE], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7ff9afb7d090}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
ioctl(1, TCGETS, {B38400 opost isig icanon echo ...}) = 0
rt_sigaction(SIGWINCH, {sa_handler=0x7ff9b014bf60, sa_mask=[WINCH], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7ff9afb7d090}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
ioctl(1, TIOCGWINSZ, {ws_row=34, ws_col=135, ws_xpixel=1221, ws_ypixel=682}) = 0
ioctl(1, TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(1, TCGETS, {B38400 opost isig icanon echo ...}) = 0
stat("/etc/apt/sources.list", {st_mode=S_IFREG|0644, st_size=2785, ...}) = 0
openat(AT_FDCWD, "/etc/apt/sources.list", O_RDONLY|O_NOCTTY|O_CLOEXEC) = 4
read(4, "# See http://help.ubuntu.com/com"..., 4096) = 2785
read(4, "", 1311) = 0
openat(AT_FDCWD, "/var/lib/apt/lists/", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 5
fstat(5, {st_mode=S_IFDIR|0755, st_size=12288, ...}) = 0
getdents64(5, /* 66 entries */, 32768) = 5904
getdents64(5, /* 0 entries */, 32768) = 0
close(5) = 0
pipe([5, 6]) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7ff9af658ad0) = 1888
close(6) = 0
fcntl(5, F_GETFL) = 0 (flags O_RDONLY)
fstat(5, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
read(5, "", 4096) = 0
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=1888, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
close(5) = 0
wait4(1888, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 1888
stat("/var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_focal_InRelease", {st_mode=S_IFREG|0644, st_size=264892, ...}) = 0
stat("/tmp", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=4096, ...}) = 0
geteuid() = 0
getpid() = 1887It pass through that clone and continues its job. Without strace the apt install will crash the kernel.
carloslack
Motivated by https://github.com/carloslack/KoviD/issues/71