From 176c88f5214d8107d330971cbbfbbba5186a111f Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Fri, 1 Oct 2021 18:16:41 +0200 Subject: support: Add check for TID zero in support_wait_for_thread_exit Some kernel versions (observed with kernel 5.14 and earlier) can list "0" entries in /proc/self/task. This happens when a thread exits while the task list is being constructed. Treat this entry as not present, like the proposed kernel patch does: [PATCH] procfs: Do not list TID 0 in /proc//task Fixes commit 032d74eaf6179100048a5bf0ce942e97dc8b9a60 ("support: Add support_wait_for_thread_exit"). Reviewed-by: Carlos O'Donell Tested-by: Carlos O'Donell --- support/support_wait_for_thread_exit.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/support/support_wait_for_thread_exit.c b/support/support_wait_for_thread_exit.c index 658a813810..5e3be421a7 100644 --- a/support/support_wait_for_thread_exit.c +++ b/support/support_wait_for_thread_exit.c @@ -43,7 +43,10 @@ support_wait_for_thread_exit (void) return; } - if (strcmp (e->d_name, ".") == 0 || strcmp (e->d_name, "..") == 0) + /* In some kernels, "0" entries denote a thread that has just + exited. */ + if (strcmp (e->d_name, ".") == 0 || strcmp (e->d_name, "..") == 0 + || strcmp (e->d_name, "0") == 0) continue; int task_tid = atoi (e->d_name); -- cgit 1.4.1