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[4.3-rc1 regression] modular 8250 doesn't load

Started byMikael Pettersson <mikpelinux@gmail.com>
First post2015-09-14 19:10 +0200
Last post2015-09-14 20:10 +0200
Articles 9 — 4 participants

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  [4.3-rc1 regression] modular 8250 doesn't load Mikael Pettersson <mikpelinux@gmail.com> - 2015-09-14 19:10 +0200
    Re: [4.3-rc1 regression] modular 8250 doesn't load Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-09-14 20:00 +0200
      Re: [4.3-rc1 regression] modular 8250 doesn't load Mikael Pettersson <mikpelinux@gmail.com> - 2015-09-14 20:10 +0200
        Re: [4.3-rc1 regression] modular 8250 doesn't load Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-09-14 21:00 +0200
          Re: [4.3-rc1 regression] modular 8250 doesn't load Mikael Pettersson <mikpelinux@gmail.com> - 2015-09-14 22:50 +0200
            Re: [4.3-rc1 regression] modular 8250 doesn't load Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-09-14 23:20 +0200
              [PATCH] Re: [4.3-rc1 regression] modular 8250 doesn't load Jonathan McDowell <noodles@earth.li> - 2015-09-21 22:50 +0200
            Re: [4.3-rc1 regression] modular 8250 doesn't load Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-09-14 23:20 +0200
    Re: [4.3-rc1 regression] modular 8250 doesn't load Albino B Neto <bino@riseup.net> - 2015-09-14 20:10 +0200

#1224349 — [4.3-rc1 regression] modular 8250 doesn't load

FromMikael Pettersson <mikpelinux@gmail.com>
Date2015-09-14 19:10 +0200
Subject[4.3-rc1 regression] modular 8250 doesn't load
Message-ID<q8Fqp-432-9@gated-at.bofh.it>
I have CONFIG_SERIAL_8250=m.  With 4.2 '/sbin/modprobe 8250' worked
and resulted in:

[   41.354550] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
[   41.375156] serial8250: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A

With 4.3-rc1 however the command fails and logs the following:

[   34.140300] 8250_base: module license 'unspecified' taints kernel.
[   34.141846] Disabling lock debugging due to kernel taint
[   34.143388] 8250_base: Unknown symbol uart_insert_char (err 0)
[   34.144908] 8250_base: Unknown symbol uart_handle_dcd_change (err 0)
[   34.146439] 8250_base: Unknown symbol __pm_runtime_resume (err 0)
[   34.147901] 8250_base: Unknown symbol tty_termios_encode_baud_rate (err 0)
[   34.149354] 8250_base: Unknown symbol uart_handle_cts_change (err 0)
[   34.150798] 8250_base: Unknown symbol __pm_runtime_suspend (err 0)
[   34.152240] 8250_base: Unknown symbol nr_irqs (err 0)

Relevant .config fragments:

CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
CONFIG_MODVERSIONS=y

# CONFIG_SERIAL_NONSTANDARD is not set
CONFIG_SERIAL_8250=m
# CONFIG_SERIAL_8250_DEPRECATED_OPTIONS is not set
# CONFIG_SERIAL_8250_PNP is not set
# CONFIG_SERIAL_8250_PCI is not set
CONFIG_SERIAL_8250_NR_UARTS=4
CONFIG_SERIAL_8250_RUNTIME_UARTS=4
# CONFIG_SERIAL_8250_EXTENDED is not set
# CONFIG_SERIAL_8250_DW is not set
# CONFIG_SERIAL_8250_FINTEK is not set
# CONFIG_SERIAL_UARTLITE is not set
CONFIG_SERIAL_CORE=m
# CONFIG_SERIAL_JSM is not set
# CONFIG_SERIAL_SCCNXP is not set
# CONFIG_SERIAL_SC16IS7XX is not set
# CONFIG_SERIAL_ALTERA_JTAGUART is not set
# CONFIG_SERIAL_ALTERA_UART is not set
# CONFIG_SERIAL_ARC is not set
# CONFIG_SERIAL_RP2 is not set
# CONFIG_SERIAL_FSL_LPUART is not set

/Mikael
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#1224375

FromGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Date2015-09-14 20:00 +0200
Message-ID<q8GcO-4Xj-9@gated-at.bofh.it>
In reply to#1224349
On Mon, Sep 14, 2015 at 07:08:10PM +0200, Mikael Pettersson wrote:
> I have CONFIG_SERIAL_8250=m.  With 4.2 '/sbin/modprobe 8250' worked
> and resulted in:
> 
> [   41.354550] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
> [   41.375156] serial8250: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
> 
> With 4.3-rc1 however the command fails and logs the following:
> 
> [   34.140300] 8250_base: module license 'unspecified' taints kernel.

Oops, need to fix that.

> [   34.141846] Disabling lock debugging due to kernel taint
> [   34.143388] 8250_base: Unknown symbol uart_insert_char (err 0)
> [   34.144908] 8250_base: Unknown symbol uart_handle_dcd_change (err 0)
> [   34.146439] 8250_base: Unknown symbol __pm_runtime_resume (err 0)
> [   34.147901] 8250_base: Unknown symbol tty_termios_encode_baud_rate (err 0)
> [   34.149354] 8250_base: Unknown symbol uart_handle_cts_change (err 0)
> [   34.150798] 8250_base: Unknown symbol __pm_runtime_suspend (err 0)
> [   34.152240] 8250_base: Unknown symbol nr_irqs (err 0)

Are you sure you did 'modprobe' and not 'insmod'?

Peter, care to send a module license fix for this new module you
created?

thanks,

greg k-h
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#1224382

FromMikael Pettersson <mikpelinux@gmail.com>
Date2015-09-14 20:10 +0200
Message-ID<q8Gmu-5nU-11@gated-at.bofh.it>
In reply to#1224375
Greg Kroah-Hartman writes:
 > On Mon, Sep 14, 2015 at 07:08:10PM +0200, Mikael Pettersson wrote:
 > > I have CONFIG_SERIAL_8250=m.  With 4.2 '/sbin/modprobe 8250' worked
 > > and resulted in:
 > > 
 > > [   41.354550] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
 > > [   41.375156] serial8250: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
 > > 
 > > With 4.3-rc1 however the command fails and logs the following:
 > > 
 > > [   34.140300] 8250_base: module license 'unspecified' taints kernel.
 > 
 > Oops, need to fix that.
 > 
 > > [   34.141846] Disabling lock debugging due to kernel taint
 > > [   34.143388] 8250_base: Unknown symbol uart_insert_char (err 0)
 > > [   34.144908] 8250_base: Unknown symbol uart_handle_dcd_change (err 0)
 > > [   34.146439] 8250_base: Unknown symbol __pm_runtime_resume (err 0)
 > > [   34.147901] 8250_base: Unknown symbol tty_termios_encode_baud_rate (err 0)
 > > [   34.149354] 8250_base: Unknown symbol uart_handle_cts_change (err 0)
 > > [   34.150798] 8250_base: Unknown symbol __pm_runtime_suspend (err 0)
 > > [   34.152240] 8250_base: Unknown symbol nr_irqs (err 0)
 > 
 > Are you sure you did 'modprobe' and not 'insmod'?

Yes, I used modprobe.  I double-checked.

 > Peter, care to send a module license fix for this new module you
 > created?

/Mikael
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#1224411

FromGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Date2015-09-14 21:00 +0200
Message-ID<q8H8S-6mh-19@gated-at.bofh.it>
In reply to#1224382
On Mon, Sep 14, 2015 at 08:06:21PM +0200, Mikael Pettersson wrote:
> Greg Kroah-Hartman writes:
>  > On Mon, Sep 14, 2015 at 07:08:10PM +0200, Mikael Pettersson wrote:
>  > > I have CONFIG_SERIAL_8250=m.  With 4.2 '/sbin/modprobe 8250' worked
>  > > and resulted in:
>  > > 
>  > > [   41.354550] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
>  > > [   41.375156] serial8250: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
>  > > 
>  > > With 4.3-rc1 however the command fails and logs the following:
>  > > 
>  > > [   34.140300] 8250_base: module license 'unspecified' taints kernel.
>  > 
>  > Oops, need to fix that.
>  > 
>  > > [   34.141846] Disabling lock debugging due to kernel taint
>  > > [   34.143388] 8250_base: Unknown symbol uart_insert_char (err 0)
>  > > [   34.144908] 8250_base: Unknown symbol uart_handle_dcd_change (err 0)
>  > > [   34.146439] 8250_base: Unknown symbol __pm_runtime_resume (err 0)
>  > > [   34.147901] 8250_base: Unknown symbol tty_termios_encode_baud_rate (err 0)
>  > > [   34.149354] 8250_base: Unknown symbol uart_handle_cts_change (err 0)
>  > > [   34.150798] 8250_base: Unknown symbol __pm_runtime_suspend (err 0)
>  > > [   34.152240] 8250_base: Unknown symbol nr_irqs (err 0)
>  > 
>  > Are you sure you did 'modprobe' and not 'insmod'?
> 
> Yes, I used modprobe.  I double-checked.

Then your build should have failed if these functions are not being
exported properly by your .config.  Most of these are in the serial_core
module, is that present/loaded?

thanks,

greg k-h
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#1224446

FromMikael Pettersson <mikpelinux@gmail.com>
Date2015-09-14 22:50 +0200
Message-ID<q8IRk-qR-19@gated-at.bofh.it>
In reply to#1224411
Greg Kroah-Hartman writes:
 > On Mon, Sep 14, 2015 at 08:06:21PM +0200, Mikael Pettersson wrote:
 > > Greg Kroah-Hartman writes:
 > >  > On Mon, Sep 14, 2015 at 07:08:10PM +0200, Mikael Pettersson wrote:
 > >  > > I have CONFIG_SERIAL_8250=m.  With 4.2 '/sbin/modprobe 8250' worked
 > >  > > and resulted in:
 > >  > > 
 > >  > > [   41.354550] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
 > >  > > [   41.375156] serial8250: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
 > >  > > 
 > >  > > With 4.3-rc1 however the command fails and logs the following:
 > >  > > 
 > >  > > [   34.140300] 8250_base: module license 'unspecified' taints kernel.
 > >  > 
 > >  > Oops, need to fix that.
 > >  > 
 > >  > > [   34.141846] Disabling lock debugging due to kernel taint
 > >  > > [   34.143388] 8250_base: Unknown symbol uart_insert_char (err 0)
 > >  > > [   34.144908] 8250_base: Unknown symbol uart_handle_dcd_change (err 0)
 > >  > > [   34.146439] 8250_base: Unknown symbol __pm_runtime_resume (err 0)
 > >  > > [   34.147901] 8250_base: Unknown symbol tty_termios_encode_baud_rate (err 0)
 > >  > > [   34.149354] 8250_base: Unknown symbol uart_handle_cts_change (err 0)
 > >  > > [   34.150798] 8250_base: Unknown symbol __pm_runtime_suspend (err 0)
 > >  > > [   34.152240] 8250_base: Unknown symbol nr_irqs (err 0)
 > >  > 
 > >  > Are you sure you did 'modprobe' and not 'insmod'?
 > > 
 > > Yes, I used modprobe.  I double-checked.
 > 
 > Then your build should have failed if these functions are not being
 > exported properly by your .config.  Most of these are in the serial_core
 > module, is that present/loaded?

Yes, serial_core is loaded.

uart_insert_char is EXPORT_SYMBOL_GPL, so could the missing license tag be preventing
8250_core from binding to it?  (I haven't checked the other symbols but I assume they
are also _GPL.)
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#1224455

FromGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Date2015-09-14 23:20 +0200
Message-ID<q8Jkl-1e5-1@gated-at.bofh.it>
In reply to#1224446
On Mon, Sep 14, 2015 at 02:12:43PM -0700, Greg Kroah-Hartman wrote:
> On Mon, Sep 14, 2015 at 10:42:24PM +0200, Mikael Pettersson wrote:
> > Greg Kroah-Hartman writes:
> >  > On Mon, Sep 14, 2015 at 08:06:21PM +0200, Mikael Pettersson wrote:
> >  > > Greg Kroah-Hartman writes:
> >  > >  > On Mon, Sep 14, 2015 at 07:08:10PM +0200, Mikael Pettersson wrote:
> >  > >  > > I have CONFIG_SERIAL_8250=m.  With 4.2 '/sbin/modprobe 8250' worked
> >  > >  > > and resulted in:
> >  > >  > > 
> >  > >  > > [   41.354550] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
> >  > >  > > [   41.375156] serial8250: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
> >  > >  > > 
> >  > >  > > With 4.3-rc1 however the command fails and logs the following:
> >  > >  > > 
> >  > >  > > [   34.140300] 8250_base: module license 'unspecified' taints kernel.
> >  > >  > 
> >  > >  > Oops, need to fix that.
> >  > >  > 
> >  > >  > > [   34.141846] Disabling lock debugging due to kernel taint
> >  > >  > > [   34.143388] 8250_base: Unknown symbol uart_insert_char (err 0)
> >  > >  > > [   34.144908] 8250_base: Unknown symbol uart_handle_dcd_change (err 0)
> >  > >  > > [   34.146439] 8250_base: Unknown symbol __pm_runtime_resume (err 0)
> >  > >  > > [   34.147901] 8250_base: Unknown symbol tty_termios_encode_baud_rate (err 0)
> >  > >  > > [   34.149354] 8250_base: Unknown symbol uart_handle_cts_change (err 0)
> >  > >  > > [   34.150798] 8250_base: Unknown symbol __pm_runtime_suspend (err 0)
> >  > >  > > [   34.152240] 8250_base: Unknown symbol nr_irqs (err 0)
> >  > >  > 
> >  > >  > Are you sure you did 'modprobe' and not 'insmod'?
> >  > > 
> >  > > Yes, I used modprobe.  I double-checked.
> >  > 
> >  > Then your build should have failed if these functions are not being
> >  > exported properly by your .config.  Most of these are in the serial_core
> >  > module, is that present/loaded?
> > 
> > Yes, serial_core is loaded.
> > 
> > uart_insert_char is EXPORT_SYMBOL_GPL, so could the missing license tag be preventing
> > 8250_core from binding to it?  (I haven't checked the other symbols but I assume they
> > are also _GPL.)
> 
> Ah, crap, yes, you are right.  You can test this with a simple:
> 	MODULE_LICENSE("GPL");
> line added to the 8250_base file.

Wait, 8250_base.c has a module license line.

Can you provide a full .config file?

thanks,

greg k-h
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#1229724 — [PATCH] Re: [4.3-rc1 regression] modular 8250 doesn't load

FromJonathan McDowell <noodles@earth.li>
Date2015-09-21 22:50 +0200
Subject[PATCH] Re: [4.3-rc1 regression] modular 8250 doesn't load
Message-ID<qbgc9-NQ-7@gated-at.bofh.it>
In reply to#1224455
In article <20150914211827.GA3440@kroah.com> (earth.lists.linux-kernel)
you wrote:
> On Mon, Sep 14, 2015 at 02:12:43PM -0700, Greg Kroah-Hartman wrote:
> > On Mon, Sep 14, 2015 at 10:42:24PM +0200, Mikael Pettersson wrote:
> > > Greg Kroah-Hartman writes: uart_insert_char is EXPORT_SYMBOL_GPL,
> > > so could the missing license tag be preventing 8250_core from
> > > binding to it?  (I haven't checked the other symbols but I assume
> > > they are also _GPL.)
> > 
> > Ah, crap, yes, you are right.  You can test this with a simple:
> > MODULE_LICENSE("GPL"); line added to the 8250_base file.

> Wait, 8250_base.c has a module license line.

8250_base.c doesn't exist; it is built from 8250_port.c and 8250_dma.c,
neither of which have a MODULE_LICENSE line. Adding
MODULE_LICENSE("GPL") as per below fixes the issue for me (on 4.3-rc2):

-----
Author: Jonathan McDowell <noodles@earth.li>
Date:   Mon Sep 21 21:20:53 2015 +0100

    Add missing module license for 8250_base.ko
    
    The split of the 8250 driver into a 8250_base/8250.ko resulted in a
    lack of a license for the 8250_base.ko module. This caused the module
    to fail to load and the kernel to be tainted. Add the appropriate
    MODULE_LICENSE to 8250_port.c, which is always compiled into
    8250_base.ko
    
    Signed-off-by: Jonathan McDowell <noodles@earth.li>

diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 54e6c8d..b1e0ba3 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -2910,3 +2910,5 @@ int serial8250_console_setup(struct uart_port *port, char *options, bool probe)
 }
 
 #endif /* CONFIG_SERIAL_8250_CONSOLE */
+
+MODULE_LICENSE("GPL");
-----

J.

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#1224457

FromGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Date2015-09-14 23:20 +0200
Message-ID<q8Jkl-1e5-3@gated-at.bofh.it>
In reply to#1224446
On Mon, Sep 14, 2015 at 10:42:24PM +0200, Mikael Pettersson wrote:
> Greg Kroah-Hartman writes:
>  > On Mon, Sep 14, 2015 at 08:06:21PM +0200, Mikael Pettersson wrote:
>  > > Greg Kroah-Hartman writes:
>  > >  > On Mon, Sep 14, 2015 at 07:08:10PM +0200, Mikael Pettersson wrote:
>  > >  > > I have CONFIG_SERIAL_8250=m.  With 4.2 '/sbin/modprobe 8250' worked
>  > >  > > and resulted in:
>  > >  > > 
>  > >  > > [   41.354550] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
>  > >  > > [   41.375156] serial8250: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
>  > >  > > 
>  > >  > > With 4.3-rc1 however the command fails and logs the following:
>  > >  > > 
>  > >  > > [   34.140300] 8250_base: module license 'unspecified' taints kernel.
>  > >  > 
>  > >  > Oops, need to fix that.
>  > >  > 
>  > >  > > [   34.141846] Disabling lock debugging due to kernel taint
>  > >  > > [   34.143388] 8250_base: Unknown symbol uart_insert_char (err 0)
>  > >  > > [   34.144908] 8250_base: Unknown symbol uart_handle_dcd_change (err 0)
>  > >  > > [   34.146439] 8250_base: Unknown symbol __pm_runtime_resume (err 0)
>  > >  > > [   34.147901] 8250_base: Unknown symbol tty_termios_encode_baud_rate (err 0)
>  > >  > > [   34.149354] 8250_base: Unknown symbol uart_handle_cts_change (err 0)
>  > >  > > [   34.150798] 8250_base: Unknown symbol __pm_runtime_suspend (err 0)
>  > >  > > [   34.152240] 8250_base: Unknown symbol nr_irqs (err 0)
>  > >  > 
>  > >  > Are you sure you did 'modprobe' and not 'insmod'?
>  > > 
>  > > Yes, I used modprobe.  I double-checked.
>  > 
>  > Then your build should have failed if these functions are not being
>  > exported properly by your .config.  Most of these are in the serial_core
>  > module, is that present/loaded?
> 
> Yes, serial_core is loaded.
> 
> uart_insert_char is EXPORT_SYMBOL_GPL, so could the missing license tag be preventing
> 8250_core from binding to it?  (I haven't checked the other symbols but I assume they
> are also _GPL.)

Ah, crap, yes, you are right.  You can test this with a simple:
	MODULE_LICENSE("GPL");
line added to the 8250_base file.

thanks,

greg k-h
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#1224387

FromAlbino B Neto <bino@riseup.net>
Date2015-09-14 20:10 +0200
Message-ID<q8Gmu-5nU-19@gated-at.bofh.it>
In reply to#1224349
2015-09-14 14:08 GMT-03:00 Mikael Pettersson <mikpelinux@gmail.com>:
> I have CONFIG_SERIAL_8250=m.  With 4.2 '/sbin/modprobe 8250' worked
> and resulted in:
>
> [   41.354550] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
> [   41.375156] serial8250: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
>

Fix in code.

> CONFIG_SERIAL_8250=m
> # CONFIG_SERIAL_8250_DEPRECATED_OPTIONS is not set
> # CONFIG_SERIAL_8250_PNP is not set
> # CONFIG_SERIAL_8250_PCI is not set
> CONFIG_SERIAL_8250_NR_UARTS=4
> CONFIG_SERIAL_8250_RUNTIME_UARTS=4
> # CONFIG_SERIAL_8250_EXTENDED is not set
> # CONFIG_SERIAL_8250_DW is not set
> # CONFIG_SERIAL_8250_FINTEK is not set

Do you use commands modprobe for load ?

  Albino
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