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Normally when that happens the return code of ptrace(PTRACE_ATTACH, x) is EPERM, which could also have other reasons. To detect the true reason, we try to open /proc//status which normally fails in that situation, but it may happen that the fopen succeeds, and the thread disappears while reading the content, then the read has the errno=ESRCH, use that as an indication that the thread has exited between fopen and reading of the status file. --- gdb/nat/linux-procfs.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) v2: from kernel code review, it seems the missing "State:" can only happen if the thread disappeared, so no need to look at errno at all here. diff --git a/gdb/nat/linux-procfs.c b/gdb/nat/linux-procfs.c index e2086952ce6..8d46d5bf289 100644 --- a/gdb/nat/linux-procfs.c +++ b/gdb/nat/linux-procfs.c @@ -157,17 +157,12 @@ linux_proc_pid_is_gone (pid_t pid) enum proc_state state; have_state = linux_proc_pid_get_state (pid, 0, &state); - if (have_state < 0) + if (have_state <= 0) { - /* If we can't open the status file, assume the thread has - disappeared. */ + /* If we can't open the status file or there is no "State:" line, + assume the thread has disappeared. */ return 1; } - else if (have_state == 0) - { - /* No "State:" line, assume thread is alive. */ - return 0; - } else return (state == PROC_STATE_ZOMBIE || state == PROC_STATE_DEAD); } -- 2.39.2