stdout_serialize_begin can cause a deadlock #1039

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opened 2022-09-30 04:44:03 -05:00 by peterharperuk · 2 comments

peterharperuk commented 2022-09-30 04:44:03 -05:00 (Migrated from github.com)

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See https://github.com/georgerobotics/cyw43-driver/issues/33

See https://github.com/georgerobotics/cyw43-driver/issues/33

kilograham commented 2022-09-30 08:25:16 -05:00 (Migrated from github.com)

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Ok, so the problem here is interaction of two different mutexes:

core 0 is doing plain getchar() which takes stdio_usb mutex but not printf mutex.

core 1 does printf that takes printf mutex, then fails to take stdio_usb_mutex

core 0 IRQ does printf, which tries to take printf mutex

Ok, so the problem here is interaction of two different mutexes: core 0 is doing plain getchar() which takes stdio_usb mutex but **not** printf mutex. core 1 does printf that takes printf mutex, then fails to take stdio_usb_mutex core 0 IRQ does printf, which tries to take printf mutex

kilograham commented 2023-02-06 16:27:51 -06:00 (Migrated from github.com)

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merged into develop

merged into develop

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