From: Andi Kleen <andi@firstfloor.org>
To: gregkh@linuxfoundation.org, linux-serial@vger.kernel.org,
linux-kernel@vger.kernel.org, peter@hurleysoftware.com
Subject: 4.3 serial driver crashes with console shortly after boot
Date: Tue, 10 Nov 2015 01:29:39 +0100 [thread overview]
Message-ID: <20151110002939.GG3533@two.firstfloor.org> (raw)
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@linux.intel.com -- Speaking for myself only.
next reply other threads:[~2015-11-10 0:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-10 0:29 Andi Kleen [this message]
2015-11-10 1:52 ` 4.3 serial driver crashes with console shortly after boot Peter Hurley
2015-11-10 22:39 ` Andi Kleen
2015-11-10 22:43 ` Andi Kleen
2015-11-10 23:15 ` Peter Hurley
2015-11-11 11:14 ` Peter Hurley
2015-11-11 16:50 ` Andi Kleen
2017-06-23 11:23 ` Jiri Slaby
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