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TIF_NOTIFY_SIGNAL is used to kick a task in uninterruptible sleep to return to userspace and run task work and then go back to sleep. This mechanism works well but breaks e.g., coredumps. dump_interrupted() only allows fatal signals to interrupt a coredump and the whole regular write path going to actual filesystems is impervious to TIF_NOTIFY_SIGNAL as well. Add PF_NO_NOTIFY_SIGNAL and helpers to raise and restore it. This is the same approach as memalloc_nofs_save(). signal_pending() will not report a fake pending signal via TIF_NOTIFY_SIGNAL if inside a PF_NO_NOTIFY_SIGNAL section. No functional changes. Link: https://patch.msgid.link/20260824-work-tif_notify_signal-v2-1-6609e42b3157@kernel.org Reviewed-by: Oleg Nesterov <oleg@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org> |
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