7.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Karl Mehltretter commit 28fa9af353bed2bb738c46e31f9b7d0347b759d1 upstream. hrtimer_rearm_deferred_user_irq() removes the rearm bit from the local copy of the TIF work with: *tif_work &= ~TIF_HRTIMER_REARM; TIF_HRTIMER_REARM is the bit number (12), not the mask. That clears TIF_NOTIFY_SIGNAL (bit 2) and TIF_MEMDIE (bit 3) from the copy and leaves bit 12 set. So the function never returns true, and the copy handed to exit_to_user_mode_loop() lacks TIF_NOTIFY_SIGNAL. If that was the only work for the loop, the task returns to user space with the task work still pending. hrtimer_interrupt() sets TIF_HRTIMER_REARM every time, so the next tick repeats that. Task work queued with TWA_SIGNAL from a hrtimer callback stays pending until the task does a syscall, takes an interrupt without deferred rearm or has to reschedule. A task which polls the io_uring completion ring in user space sees a timeout completion after 30ms (median) instead of 70us. 2 CPU QEMU guest, HZ=1000. Use the mask. Fixes: 15dd3a948855 ("hrtimer: Push reprogramming timers into the interrupt return path") Signed-off-by: Karl Mehltretter Signed-off-by: Thomas Gleixner Assisted-by: LLM Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260919144027.70250-1-kmehltretter@gmail.com Signed-off-by: Greg Kroah-Hartman --- include/linux/hrtimer_rearm.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/include/linux/hrtimer_rearm.h +++ b/include/linux/hrtimer_rearm.h @@ -40,7 +40,7 @@ hrtimer_rearm_deferred_user_irq(unsigned clear_thread_flag(TIF_HRTIMER_REARM); __hrtimer_rearm_deferred(); /* Don't go into the loop if HRTIMER_REARM was the only flag */ - *tif_work &= ~TIF_HRTIMER_REARM; + *tif_work &= ~_TIF_HRTIMER_REARM; return !*tif_work; } return false;