Re: [uml-devel] does 3.12.2 breaks UML with "con=xterm" ?

["Toralf Förster" <toralf.foerster@gmx.de>]

On 11/30/2013 06:35 PM, Richard Weinberger wrote:
> Am Samstag, 30. November 2013, 18:26:45 schrieb Toralf Förster:
>> On 11/30/2013 05:36 PM, Richard Weinberger wrote:
>>> Am Samstag, 30. November 2013, 17:28:55 schrieb Toralf Förster:
>>>> On 11/30/2013 03:51 PM, Richard Weinberger wrote:
>>>>> Please more details.
>>>>> Does Linus' tree work?
>>>>> Does it crash immediately?
>>>>
>>>> Does this helps ? :
>>> Please try Linus's tree and run it without GDB.
>>> UML now has a complete new stack unwinder, let's give it a try.
>>
>> I tried it again now with host kernel 3.13-rc2 - (and guest kernel 3.11,
>> 3.12 and 3.13-rc2) - same picture.
>>
>> (FWIW I tried the UML guest already with a lot of versions inclusive
>> latest Linus git tree, but for the host I'd like to run latest stable
>> from Greg KH)
> 
> Please show me the backtrace from Linus' tree.
> 
> Thanks,
> //richard
> 
3 subsequent runs gave these 3 back traces :


tfoerste@n22 /mnt/ramdisk $ cat bt-g 
[New LWP 5297]
Core was generated by `/home/tfoerste/devel/linux/linux earlyprintk ubda=/home/tfoerste/virtual/uml/tr'.
Program terminated with signal 11, Segmentation fault.
#0  constant_test_bit (addr=<optimized out>, nr=<optimized out>) at /home/tfoerste/devel/linux/arch/x86/include/asm/bitops.h:313
313                     (addr[nr >> _BITOPS_LONG_SHIFT])) != 0;
#0  constant_test_bit (addr=<optimized out>, nr=<optimized out>) at /home/tfoerste/devel/linux/arch/x86/include/asm/bitops.h:313
No locals.
#1  test_ti_thread_flag (ti=<optimized out>, flag=<optimized out>) at include/linux/thread_info.h:93
No locals.
#2  test_tsk_thread_flag (flag=<optimized out>, tsk=<optimized out>) at include/linux/sched.h:2422
No locals.
#3  signal_pending (p=<optimized out>) at include/linux/sched.h:2448
No locals.
#4  __set_task_blocked (tsk=0x34747865, newset=0x49b41f4c) at kernel/signal.c:2530
No locals.
#5  0x0808a390 in __set_current_blocked (newset=0x49b41f4c) at kernel/signal.c:2558
        tsk = 0x34747865
#6  0x0808a3b7 in set_current_blocked (newset=0x0) at kernel/signal.c:2550
No locals.
#7  0x0808b8fd in sigsuspend (set=0x0) at kernel/signal.c:3556
No locals.
#8  0x080646d8 in winch_thread (arg=0x0) at arch/um/drivers/chan_user.c:210
        sigs = <incomplete type>
        pty_fd = 172431400
        pipe_fd = 15
        c = 1 '\001'
#9  0x083da38e in clone ()
No symbol table info available.


tfoerste@n22 /mnt/ramdisk $ cat bt-g
[New LWP 5557]
Core was generated by `/home/tfoerste/devel/linux/linux earlyprintk ubda=/home/tfoerste/virtual/uml/tr'.
Program terminated with signal 11, Segmentation fault.
#0  0x0808b8da in sigsuspend (set=0x0) at kernel/signal.c:3555
3555            current->saved_sigmask = current->blocked;
#0  0x0808b8da in sigsuspend (set=0x0) at kernel/signal.c:3555
No locals.
#1  0x080646d8 in winch_thread (arg=0x0) at arch/um/drivers/chan_user.c:210
        sigs = <incomplete type>
        pty_fd = 145942568
        pipe_fd = 15
        c = 1 '\001'
#2  0x083da38e in clone ()
No symbol table info available.


tfoerste@n22 /mnt/ramdisk $ cat bt-g
[New LWP 5809]
Core was generated by `/home/tfoerste/devel/linux/linux earlyprintk ubda=/home/tfoerste/virtual/uml/tr'.
Program terminated with signal 11, Segmentation fault.
#0  constant_test_bit (addr=<optimized out>, nr=<optimized out>) at /home/tfoerste/devel/linux/arch/x86/include/asm/bitops.h:313
313                     (addr[nr >> _BITOPS_LONG_SHIFT])) != 0;
#0  constant_test_bit (addr=<optimized out>, nr=<optimized out>) at /home/tfoerste/devel/linux/arch/x86/include/asm/bitops.h:313
No locals.
#1  test_ti_thread_flag (ti=<optimized out>, flag=<optimized out>) at include/linux/thread_info.h:93
No locals.
#2  test_tsk_thread_flag (flag=<optimized out>, tsk=<optimized out>) at include/linux/sched.h:2422
No locals.
#3  signal_pending (p=<optimized out>) at include/linux/sched.h:2448
No locals.
#4  __set_task_blocked (tsk=0x34747865, newset=0x48b41f4c) at kernel/signal.c:2530
No locals.
#5  0x0808a390 in __set_current_blocked (newset=0x48b41f4c) at kernel/signal.c:2558
        tsk = 0x34747865
#6  0x0808a3b7 in set_current_blocked (newset=0x0) at kernel/signal.c:2550
No locals.
#7  0x0808b8fd in sigsuspend (set=0x0) at kernel/signal.c:3556
No locals.
#8  0x080646d8 in winch_thread (arg=0x0) at arch/um/drivers/chan_user.c:210
        sigs = <incomplete type>
        pty_fd = 152619048
        pipe_fd = 15
        c = 1 '\001'
#9  0x083da38e in clone ()
No symbol table info available.

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

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