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commit 4bf72519987ebc2be4a2058c670379040fae90ea
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Fri Oct 1 18:16:41 2021 +0200
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support: Add check for TID zero in support_wait_for_thread_exit
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Some kernel versions (observed with kernel 5.14 and earlier) can list
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"0" entries in /proc/self/task. This happens when a thread exits
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while the task list is being constructed. Treat this entry as not
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present, like the proposed kernel patch does:
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[PATCH] procfs: Do not list TID 0 in /proc/<pid>/task
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<https://lore.kernel.org/all/8735pn5dx7.fsf@oldenburg.str.redhat.com/>
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Fixes commit 032d74eaf6179100048a5bf0ce942e97dc8b9a60 ("support: Add
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support_wait_for_thread_exit").
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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Tested-by: Carlos O'Donell <carlos@redhat.com>
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(cherry picked from commit 176c88f5214d8107d330971cbbfbbba5186a111f)
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diff --git a/support/support_wait_for_thread_exit.c b/support/support_wait_for_thread_exit.c
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index 658a81381006ea62..5e3be421a78a4c78 100644
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--- a/support/support_wait_for_thread_exit.c
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+++ b/support/support_wait_for_thread_exit.c
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@@ -43,7 +43,10 @@ support_wait_for_thread_exit (void)
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return;
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}
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- if (strcmp (e->d_name, ".") == 0 || strcmp (e->d_name, "..") == 0)
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+ /* In some kernels, "0" entries denote a thread that has just
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+ exited. */
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+ if (strcmp (e->d_name, ".") == 0 || strcmp (e->d_name, "..") == 0
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+ || strcmp (e->d_name, "0") == 0)
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continue;
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int task_tid = atoi (e->d_name);
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