Bug #15315: ec_switch can still lose interrupts

• Status: Assigned
• Assignee: ko1 (Koichi Sasada)
• Target version: -
• Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
• Tags: core, patch

[normalperson (Eric Wong)]

ec_switch and thread switching may still lose interrupts

trap interrupt is OK because of r64062

Not OK:

1. postponed job interrupt from MJIT worker
   This is trickiest to solve because it also affects thread switching,
   not just EC switching

2. pending interrupt is not safe but fixing ec_switch is sufficient because
   rb_threadptr_interrupt only targets threads, not EC.

3. timer interrupt is not critical because another interrupt will fire in 100ms

Solutions:

moving interrupt_flag back to rb_thread_t will solve 2 and 3

1. will remain dangerous, we need to add extra checks at thread switching
   because MJIT worker may get stuck if target thread stalls or dies.

[normalperson (Eric Wong)]

• File 0001-vm_core.h-move-interrupt_flag-back-to-rb_thread_t.patch 0001-vm_core.h-move-interrupt_flag-back-to-rb_thread_t.patch added

[k0kubun (Takashi Kokubun)]

1. will remain dangerous

Is this about Bug #15316?

[normalperson (Eric Wong)]

[e-mail] wrote:

1. will remain dangerous

Is this about Bug #15316?

Partially, yes (sorry, just (mostly) wrapped up Thread::Light
for review on Linux and unlikely to be online much due to
family stuff.

[hsbt (Hiroshi SHIBATA)]

• Status changed from Open to Assigned