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

[Richard Weinberger <richard@nod.at>]

Am Samstag, 30. November 2013, 19:19:59 schrieb Toralf Förster:
> 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 :

Sorry for being imprecise, I meant the raw output from UML, not GDB.
Currently it looks like yet another cluster fuck within the winch-Thread.

Thanks,
//richard

> 
> 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.


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