Re: [uml-user] resizing a KDE Konsole let a UML instance crash

[Toralf F. <tor...@gm...>]

On 03/05/2013 06:30 PM, richard -rw- weinberger wrote:
> On Tue, Mar 5, 2013 at 4:33 PM, Toralf Förster <tor...@gm...> wrote:
>> On 03/05/2013 01:51 AM, Pierluigi Rolando wrote:
>>>  I think what's going on
>>> here is that UML gets a signal it can't handle when you resize.
>>
>> Yes - something _is_ wrong with the signal handling, but my command line looks not suspicous, or ? :
>> /usr/local/bin/linux-v3.8.2 earlyprintk ubda=/home/tfoerste/virtual/uml/n22stab4 ubdb=/mnt/ramdisk/swap_n22stab4 >eth0=tuntap,tap0,72:ef:3d:fd:4a:0b mem=768M umid=uml
> 
> I bet the attached patch makes the problem go away.
> Please confirm.
> 
negative - applied on top of v3.9-rc1 :

diff --git a/arch/um/drivers/stdio_console.c b/arch/um/drivers/stdio_console.c
index 827777a..7b361f3 100644
--- a/arch/um/drivers/stdio_console.c
+++ b/arch/um/drivers/stdio_console.c
@@ -110,7 +110,6 @@ static const struct tty_operations console_ops = {
        .set_termios            = line_set_termios,
        .throttle               = line_throttle,
        .unthrottle             = line_unthrottle,
-       .cleanup                = line_cleanup,
        .hangup                 = line_hangup,
 };




- but issue still there :

VFS: Mounted root (ext4 filesystem) readonly on device 98:0.
devtmpfs: mounted
INIT: version 2.88 booting

EIP: 0073:[<0808c0a8>] CPU: 0 Not tainted ESP: 007b:0840f768 EFLAGS: 00010202                       
    Not tainted                                                                                     
EAX: 00000004 EBX: 3958b800 ECX: 00000001 EDX: fffffffd                                             
ESI: 395788c0 EDI: 0000001c EBP: 0840f780 DS: 007b ES: 007b                                         
0840eecc:  [<0807921f>] show_regs+0x10f/0x120                                                       
0840eee8:  [<08061f12>] segv+0x62/0x2b0                                                             
0840ef98:  [<080621d3>] segv_handler+0x73/0x80                                                      
0840efc0:  [<080719d8>] sig_handler_common+0xb8/0xe0                                                
0840f244:  [<08071b1d>] sig_handler+0x3d/0x50                                                       
0840f254:  [<0807166b>] hard_handler+0x6b/0xa0                                                      
0840f27c:  [<b775440c>] 0xb775440c                                                                  
0840f784:  [<0808c3b6>] kill_pgrp+0x26/0x30
0840f798:  [<08064de3>] winch_interrupt+0xf3/0x120
0840f7bc:  [<080c7b0f>] handle_irq_event_percpu+0x2f/0x150
0840f7ec:  [<080c7c57>] handle_irq_event+0x27/0x40
0840f800:  [<080c9f60>] handle_edge_irq+0xd0/0x100
0840f810:  [<080c74c8>] generic_handle_irq+0x28/0x30
0840f820:  [<0805ee55>] do_IRQ+0x25/0x40
0840f830:  [<080623a9>] winch+0x19/0x20
0840f840:  [<080719d8>] sig_handler_common+0xb8/0xe0
0840fac4:  [<08071b1d>] sig_handler+0x3d/0x50
0840fad4:  [<0807166b>] hard_handler+0x6b/0xa0
0840fafc:  [<b775440c>] 0xb775440c

Kernel panic - not syncing: Segfault with no mm
0840eea8:  [<08342658>] dump_stack+0x22/0x24
0840eec0:  [<083426d4>] panic+0x7a/0x18b
0840eee8:  [<08061f1e>] segv+0x6e/0x2b0
0840ef98:  [<080621d3>] segv_handler+0x73/0x80
0840efc0:  [<080719d8>] sig_handler_common+0xb8/0xe0
0840f244:  [<08071b1d>] sig_handler+0x3d/0x50
0840f254:  [<0807166b>] hard_handler+0x6b/0xa0
0840f27c:  [<b775440c>] 0xb775440c
0840f784:  [<0808c3b6>] kill_pgrp+0x26/0x30
0840f798:  [<08064de3>] winch_interrupt+0xf3/0x120
0840f7bc:  [<080c7b0f>] handle_irq_event_percpu+0x2f/0x150
0840f7ec:  [<080c7c57>] handle_irq_event+0x27/0x40
0840f800:  [<080c9f60>] handle_edge_irq+0xd0/0x100
0840f810:  [<080c74c8>] generic_handle_irq+0x28/0x30
0840f820:  [<0805ee55>] do_IRQ+0x25/0x40
0840f830:  [<080623a9>] winch+0x19/0x20
0840f840:  [<080719d8>] sig_handler_common+0xb8/0xe0
0840fac4:  [<08071b1d>] sig_handler+0x3d/0x50
0840fad4:  [<0807166b>] hard_handler+0x6b/0xa0
0840fafc:  [<b775440c>] 0xb775440c


EIP: 0000:[<00000000>] CPU: 0 Not tainted EFLAGS: 00000000
    Not tainted
EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000
ESI: 00000000 EDI: 00000000 EBP: 00000000 DS: 0000 ES: 0000
0840ee5c:  [<0807921f>] show_regs+0x10f/0x120
0840ee78:  [<0806253c>] panic_exit+0x2c/0x50
0840ee88:  [<0809d1d8>] notifier_call_chain+0x38/0x60
0840eeb0:  [<0809d323>] atomic_notifier_call_chain+0x23/0x30
0840eec0:  [<083426fc>] panic+0xa2/0x18b
0840eee8:  [<08061f1e>] segv+0x6e/0x2b0
0840ef98:  [<080621d3>] segv_handler+0x73/0x80
0840efc0:  [<080719d8>] sig_handler_common+0xb8/0xe0
0840f244:  [<08071b1d>] sig_handler+0x3d/0x50
0840f254:  [<0807166b>] hard_handler+0x6b/0xa0
0840f27c:  [<b775440c>] 0xb775440c
0840f784:  [<0808c3b6>] kill_pgrp+0x26/0x30
0840f798:  [<08064de3>] winch_interrupt+0xf3/0x120
0840f7bc:  [<080c7b0f>] handle_irq_event_percpu+0x2f/0x150
0840f7ec:  [<080c7c57>] handle_irq_event+0x27/0x40
0840f800:  [<080c9f60>] handle_edge_irq+0xd0/0x100
0840f810:  [<080c74c8>] generic_handle_irq+0x28/0x30
0840f820:  [<0805ee55>] do_IRQ+0x25/0x40
0840f830:  [<080623a9>] winch+0x19/0x20
0840f840:  [<080719d8>] sig_handler_common+0xb8/0xe0
0840fac4:  [<08071b1d>] sig_handler+0x3d/0x50
0840fad4:  [<0807166b>] hard_handler+0x6b/0xa0
0840fafc:  [<b775440c>] 0xb775440c

Terminated

-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3