Messages in this thread | | | Date | Tue, 1 Aug 2017 21:42:04 +0900 | From | Sergey Senozhatsky <> | Subject | Re: linux-next: Tree for Aug 1 |
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Hello,
seems that commit 979990c6284814617 ("tty: improve tty_insert_flip_char() fast path") panics my kernel.
in particular, this part
@@ -26,7 +27,7 @@ static inline int tty_insert_flip_char(struct tty_port *port, *char_buf_ptr(tb, tb->used++) = ch; return 1; } - return tty_insert_flip_string_flags(port, &ch, &flag, 1); + return __tty_insert_flip_char(port, ch, flag); }
I see various callstacks, but all endup in llist_del_first() -> fatal exception in interrupt -> panic()
... uart_insert_char() __tty_insert_flip_char() __tty_buffer_request_room() llist_del_first()
or
... kdb_event() puts_queue() __tty_insert_flip_char() __tty_buffer_request_room() llist_del_first()
to reproduce:
1) screen /dev/ttyS0 115200 2) send several chars down to /dev/ttyS0, enough to panic() the kernel.
reverting that __tty_insert_flip_char(port, ch, flag) seems to work on my side.
-ss
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