Re: [serial] 13a7238eea: WARNING: CPU: 0 PID: 1 at drivers/tty/serial/serial_core.c:99 uart_change_pm+0x35/0x162
Hi,
On 05/03/2016 08:13 PM, kernel test robot wrote:
>
> FYI, we noticed the following commit:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing
> commit 13a7238eeab5718bf968e2a835205ba659a38a77 ("serial: core: Prevent
> unsafe uart port access, part 3")
This should be fixed on most recent tty-testing and tty-next branches.
Please re-test on last tty-testing branch including commit
7da4b8b7378790dd1e4af1bb7522863127fa1438
("serial: core: Fix port mutex assert if lockdep disabled")
Regards,
Peter Hurley
> on test machine: vm-vp-quantal-x86_64: 2 threads qemu-system-x86_64
> -enable-kvm with 360M memory
>
> caused below changes:
>
>
> [7.249323] [ cut here ]
> [7.249323] [ cut here ]
> [7.250172] WARNING: CPU: 0 PID: 1 at drivers/tty/serial/serial_core.c:99
> uart_change_pm+0x35/0x162
> [7.250172] WARNING: CPU: 0 PID: 1 at drivers/tty/serial/serial_core.c:99
> uart_change_pm+0x35/0x162
> [7.252110] Modules linked in:
> [7.252110] Modules linked in:
>
> [7.252679] CPU: 0 PID: 1 Comm: swapper/0 Tainted: GB
> 4.6.0-rc5-00015-g13a7238 #1
> [7.252679] CPU: 0 PID: 1 Comm: swapper/0 Tainted: GB
> 4.6.0-rc5-00015-g13a7238 #1
> [7.254232] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> Debian-1.8.2-1 04/01/2014
> [7.254232] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> Debian-1.8.2-1 04/01/2014
> [7.255806]
> [7.255806] 88000f42f668 88000f42f668
> 815a2566 815a2566 0286 0286
>
> [7.257180] 41b58ab3
> [7.257180] 41b58ab3 81f66067 81f66067
> 815a240c 815a240c 81f7647d 81f7647d
>
> [7.258601] 81238abf
> [7.258601] 81238abf 0042f6a8 0042f6a8
> ed0001e85ecb ed0001e85ecb
>
> [7.259973] Call Trace:
> [7.259973] Call Trace:
> [7.260422] [] dump_stack+0x15a/0x1de
> [7.260422] [] dump_stack+0x15a/0x1de
> [7.261374] [] ? _atomic_dec_and_lock+0xaf/0xaf
> [7.261374] [] ? _atomic_dec_and_lock+0xaf/0xaf
> [7.262470] [] ? is_module_text_address+0x1f/0x1f
> [7.262470] [] ? is_module_text_address+0x1f/0x1f
> [7.263595] [] ? uart_change_pm+0x35/0x162
> [7.263595] [] ? uart_change_pm+0x35/0x162
> [7.264623] [] __warn+0x16e/0x189
> [7.264623] [] __warn+0x16e/0x189
> [7.265523] [] warn_slowpath_null+0x18/0x1a
> [7.265523] [] warn_slowpath_null+0x18/0x1a
> [7.266561] [] uart_change_pm+0x35/0x162
> [7.266561] [] uart_change_pm+0x35/0x162
> [7.267553] [] uart_add_one_port+0xb36/0x1008
> [7.267553] [] uart_add_one_port+0xb36/0x1008
> [7.268637] [] ? uart_unregister_driver+0x150/0x150
> [7.268637] [] ? uart_unregister_driver+0x150/0x150
> [7.269786] [] ? mutex_trylock+0x4eb/0x4eb
> [7.269786] [] ? mutex_trylock+0x4eb/0x4eb
> [7.270838] []
> serial8250_register_8250_port+0xf68/0x14e5
> [7.270838] []
> serial8250_register_8250_port+0xf68/0x14e5
> [7.272116] [] serial_pnp_probe+0x2d8/0x5f1
> [7.272116] [] serial_pnp_probe+0x2d8/0x5f1
> [7.273146] [] ? check_name+0x6e/0x6e
> [7.273146] [] ? check_name+0x6e/0x6e
> [7.274125] [] ? check_name+0x6e/0x6e
> [7.274125] [] ? check_name+0x6e/0x6e
> [7.275076] [] pnp_device_probe+0x1c1/0x1dc
> [7.275076] [] pnp_device_probe+0x1c1/0x1dc
> [7.276109] [] driver_probe_device+0x325/0x63c
> [7.276109] [] driver_probe_device+0x325/0x63c
> [7.277191] [] ? driver_probe_device+0x63c/0x63c
> [7.277191] [] ? driver_probe_device+0x63c/0x63c
> [7.278299] [] __driver_attach+0x138/0x179
> [7.278299] [] __driver_attach+0x138/0x179
> [7.279316] [] bus_for_each_dev+0x10d/0x143
> [7.279316] [] bus_for_each_dev+0x10d/0x143
> [7.280372] [] ? next_device+0x52/0x52
> [7.280372] [] ? next_device+0x52/0x52
> [7.281334] [] driver_attach+0x50/0x53
> [7.281334] [] driver_attach+0x50/0x53
> [7.282302] [] bus_add_driver+0x31d/0x53e
> [7.282302] [] bus_add_driver+0x31d/0x53e
> [7.283346] [] driver_register+0x24b/0x2c3
> [7.283346] [] driver_register+0x24b/0x2c3
> [7.284370] [] pnp_register_driver+0x98/0x9f
> [7.284370] [] pnp_register_driver+0x98/0x9f
> [7.285420] [] ? univ8250_console_init+0x28/0x28
> [7.285420] [] ? univ8250_console_init+0x28/0x28
> [7.286579] [] serial8250_pnp_init+0x10/0x12
> [7.286579] [] serial8250_pnp_init+0x10/0x12
> [7.287635] [] serial8250_init+0x72/0x232
> [7.287635] [] serial8250_init+0x72/0x232
> [7.288650] [] ? univ8250_console_init+0x28/0x28
> [7.288650] [] ? univ8250_console_init+0x28/0x28
> [7.289775] [] do_one_initcall+0x287/0x36d
> [7.289775] []
Re: [serial] 13a7238eea: WARNING: CPU: 0 PID: 1 at drivers/tty/serial/serial_core.c:99 uart_change_pm+0x35/0x162
Hi,
On 05/03/2016 08:13 PM, kernel test robot wrote:
>
> FYI, we noticed the following commit:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing
> commit 13a7238eeab5718bf968e2a835205ba659a38a77 ("serial: core: Prevent
> unsafe uart port access, part 3")
This should be fixed on most recent tty-testing and tty-next branches.
Please re-test on last tty-testing branch including commit
7da4b8b7378790dd1e4af1bb7522863127fa1438
("serial: core: Fix port mutex assert if lockdep disabled")
Regards,
Peter Hurley
> on test machine: vm-vp-quantal-x86_64: 2 threads qemu-system-x86_64
> -enable-kvm with 360M memory
>
> caused below changes:
>
>
> [7.249323] [ cut here ]
> [7.249323] [ cut here ]
> [7.250172] WARNING: CPU: 0 PID: 1 at drivers/tty/serial/serial_core.c:99
> uart_change_pm+0x35/0x162
> [7.250172] WARNING: CPU: 0 PID: 1 at drivers/tty/serial/serial_core.c:99
> uart_change_pm+0x35/0x162
> [7.252110] Modules linked in:
> [7.252110] Modules linked in:
>
> [7.252679] CPU: 0 PID: 1 Comm: swapper/0 Tainted: GB
> 4.6.0-rc5-00015-g13a7238 #1
> [7.252679] CPU: 0 PID: 1 Comm: swapper/0 Tainted: GB
> 4.6.0-rc5-00015-g13a7238 #1
> [7.254232] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> Debian-1.8.2-1 04/01/2014
> [7.254232] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> Debian-1.8.2-1 04/01/2014
> [7.255806]
> [7.255806] 88000f42f668 88000f42f668
> 815a2566 815a2566 0286 0286
>
> [7.257180] 41b58ab3
> [7.257180] 41b58ab3 81f66067 81f66067
> 815a240c 815a240c 81f7647d 81f7647d
>
> [7.258601] 81238abf
> [7.258601] 81238abf 0042f6a8 0042f6a8
> ed0001e85ecb ed0001e85ecb
>
> [7.259973] Call Trace:
> [7.259973] Call Trace:
> [7.260422] [] dump_stack+0x15a/0x1de
> [7.260422] [] dump_stack+0x15a/0x1de
> [7.261374] [] ? _atomic_dec_and_lock+0xaf/0xaf
> [7.261374] [] ? _atomic_dec_and_lock+0xaf/0xaf
> [7.262470] [] ? is_module_text_address+0x1f/0x1f
> [7.262470] [] ? is_module_text_address+0x1f/0x1f
> [7.263595] [] ? uart_change_pm+0x35/0x162
> [7.263595] [] ? uart_change_pm+0x35/0x162
> [7.264623] [] __warn+0x16e/0x189
> [7.264623] [] __warn+0x16e/0x189
> [7.265523] [] warn_slowpath_null+0x18/0x1a
> [7.265523] [] warn_slowpath_null+0x18/0x1a
> [7.266561] [] uart_change_pm+0x35/0x162
> [7.266561] [] uart_change_pm+0x35/0x162
> [7.267553] [] uart_add_one_port+0xb36/0x1008
> [7.267553] [] uart_add_one_port+0xb36/0x1008
> [7.268637] [] ? uart_unregister_driver+0x150/0x150
> [7.268637] [] ? uart_unregister_driver+0x150/0x150
> [7.269786] [] ? mutex_trylock+0x4eb/0x4eb
> [7.269786] [] ? mutex_trylock+0x4eb/0x4eb
> [7.270838] []
> serial8250_register_8250_port+0xf68/0x14e5
> [7.270838] []
> serial8250_register_8250_port+0xf68/0x14e5
> [7.272116] [] serial_pnp_probe+0x2d8/0x5f1
> [7.272116] [] serial_pnp_probe+0x2d8/0x5f1
> [7.273146] [] ? check_name+0x6e/0x6e
> [7.273146] [] ? check_name+0x6e/0x6e
> [7.274125] [] ? check_name+0x6e/0x6e
> [7.274125] [] ? check_name+0x6e/0x6e
> [7.275076] [] pnp_device_probe+0x1c1/0x1dc
> [7.275076] [] pnp_device_probe+0x1c1/0x1dc
> [7.276109] [] driver_probe_device+0x325/0x63c
> [7.276109] [] driver_probe_device+0x325/0x63c
> [7.277191] [] ? driver_probe_device+0x63c/0x63c
> [7.277191] [] ? driver_probe_device+0x63c/0x63c
> [7.278299] [] __driver_attach+0x138/0x179
> [7.278299] [] __driver_attach+0x138/0x179
> [7.279316] [] bus_for_each_dev+0x10d/0x143
> [7.279316] [] bus_for_each_dev+0x10d/0x143
> [7.280372] [] ? next_device+0x52/0x52
> [7.280372] [] ? next_device+0x52/0x52
> [7.281334] [] driver_attach+0x50/0x53
> [7.281334] [] driver_attach+0x50/0x53
> [7.282302] [] bus_add_driver+0x31d/0x53e
> [7.282302] [] bus_add_driver+0x31d/0x53e
> [7.283346] [] driver_register+0x24b/0x2c3
> [7.283346] [] driver_register+0x24b/0x2c3
> [7.284370] [] pnp_register_driver+0x98/0x9f
> [7.284370] [] pnp_register_driver+0x98/0x9f
> [7.285420] [] ? univ8250_console_init+0x28/0x28
> [7.285420] [] ? univ8250_console_init+0x28/0x28
> [7.286579] [] serial8250_pnp_init+0x10/0x12
> [7.286579] [] serial8250_pnp_init+0x10/0x12
> [7.287635] [] serial8250_init+0x72/0x232
> [7.287635] [] serial8250_init+0x72/0x232
> [7.288650] [] ? univ8250_console_init+0x28/0x28
> [7.288650] [] ? univ8250_console_init+0x28/0x28
> [7.289775] [] do_one_initcall+0x287/0x36d
> [7.289775] []
