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

[Boaz Harrosh <bharrosh@panasas.com>]

On 12/01/2013 09:05 PM, Toralf Förster wrote:
> Kernel panic - not syncing: do_syscall_stub : PTRACE_SETREGS failed, errno = 3
> 
> CPU: 0 PID: 1265 Comm: rmdir Tainted: G        W    3.13.0-rc2-00001-gaf91706 #3
> Stack:
>  084bf793 084bf793 46d47bb8 00000004 085d0547 00006f91 00000003 00000011
>  46d47bc8 084247eb 00000000 00000000 46d47bf0 08421c50 084cb200 08607720
>  084c8084 46d47c00 00000000 00006f91 00000003 00000011 46d47c24 08073d55
> Call Trace:
>  [<08073d55>] ? run_syscall_stub+0x125/0x2c0
>  [<084247eb>] dump_stack+0x26/0x28
>  [<08421c50>] panic+0x7a/0x180
>  [<08073d55>] run_syscall_stub+0x125/0x2c0
>  [<080cba88>] ? unlock_page+0x28/0x30
>  [<0807429f>] map+0xff/0x110
>  [<080616ff>] flush_tlb_page+0xef/0x1d0
>  [<08061db1>] handle_page_fault+0x241/0x290
>  [<08062c9e>] do_op_one_page+0x5e/0x1a0
>  [<08071dfe>] ? set_signals+0x1e/0x40
>  [<080a3e71>] ? up_write+0x11/0x20
>  [<08062e19>] buffer_op+0x39/0xf0
>  [<08062af0>] ? clear_chunk+0x0/0x30
>  [<08063169>] clear_user+0x69/0x90
>  [<08062af0>] ? clear_chunk+0x0/0x30
>  [<080df00e>] ? vm_mmap+0x4e/0x60
>  [<08149f73>] padzero+0x23/0x40
>  [<0814bec9>] load_elf_binary+0xad9/0xe60
>  [<08052304>] ? init_zswap+0xa1/0x21e
>  [<08052160>] ? __alloc_bootmem_node_high+0x1d/0x28
>  [<08051f14>] ? __alloc_bootmem_nopanic+0x1/0x2c
>  [<080509f4>] ? pcpu_setup_first_chunk+0x527/0x834
>  [<08109bd5>] search_binary_handler+0x35/0x90
>  [<0810a055>] do_execve+0x425/0x680
>  [<081035a0>] ? default_llseek+0x70/0x150
>  [<08103788>] ? SyS_llseek+0x18/0xd0
>  [<0810a5b2>] SyS_execve+0x42/0x60
>  [<081035a0>] ? default_llseek+0x70/0x150
>  [<08103788>] ? SyS_llseek+0x18/0xd0
>  [<081035d8>] ? default_llseek+0xa8/0x150
>  [<08062a94>] handle_syscall+0x64/0x80
>  [<081034a0>] ? generic_file_llseek+0x40/0x60
>  [<081035a0>] ? default_llseek+0x70/0x150
>  [<08103788>] ? SyS_llseek+0x18/0xd0
>  [<081035a0>] ? default_llseek+0x70/0x150
>  [<081035d8>] ? default_llseek+0xa8/0x150
>  [<083d70c1>] ? ptrace+0x31/0x80
>  [<08079fb2>] ? get_fp_registers+0x22/0x40
>  [<08075085>] userspace+0x475/0x5f0
>  [<083d70c1>] ? ptrace+0x31/0x80
>  [<0807a516>] ? os_set_thread_area+0x26/0x40
>  [<08079510>] ? do_set_thread_area+0x20/0x50
>  [<08079688>] ? arch_switch_tls+0xb8/0x100
>  [<0805f750>] fork_handler+0x60/0x70


This clear_user() stack-trace reminds me a lot of the problem I just
had, and Richard solved for me.

It was that I used an "make oldconfig" with a previous Kernel
.config file. When doing a new "make defconfig" then manually
"make xconfig" to turn on the extras I need like iscsi and pnfs
It all went back to fine.

(Also for me host and guest 64bit, I had to manually set
 64bit for the guest compilation.)

[Which was a smack on my own head because I know from the past
 that UML needs a good'n fresh "make defconfig" every once in a
 while. And I just forgot about that]

Just my $0.017
Boaz


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