Hi, With 4.3 an x86 server is always crashing roughly a minute after boot in __uart_start/uart_tx_stopped. This is repeatable over multiple boots. The back trace is flush_to_ldisc->n_tty_receive_buf2->n_tty_receive_buf_common-> commit_echoes-> uart_flush_chars->uart_start It seems to follow a bad pointer here ffffffff813bbdfa: f6 80 f4 01 00 00 01 testb $0x1,0x1f4(%rax) <--- ffffffff813bbe01: 74 01 je ffffffff813bbe04 <__uart_start.isra.1+0x24> Unfortunately I don't have the contents of RAX which scrolled away, but since CR2 is 1f4 I suspect it's NUL. It seems to depend on the order of the console=... arguments on the kernel command line. With console=tty0 console=ttyS0,115200n8 it crashes, but when reversing the options it does not crash. -Andi -- ak@xxxxxxxxxxxxxxx -- Speaking for myself only. -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
