[uml-devel] current kernel (git version linux-v3.2-6100-ge343a89) crashes

[uml-devel] current kernel (git version linux-v3.2-6100-ge343a89) crashes

[Toralf Förster]

Hello,

with a recent kernel (pre-rc1) I realized this crash and wondering
whether it is worth to bisect or if there's already a fix flying around :


tfoerste@n22 ~/devel/linux $ start_uml.sh
Locating the bottom of the address space ... 0x1000
Locating the top of the address space ... 0xc0000000
Core dump limits :
        soft - NONE
        hard - NONE
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...OK
Checking advanced syscall emulation patch for ptrace...OK
Checking for tmpfs mount on /dev/shm...OK
Checking PROT_EXEC mmap in /dev/shm/...OK
Checking for the skas3 patch in the host:
  - /proc/mm...not found: No such file or directory
  - PTRACE_FAULTINFO...not found
  - PTRACE_LDT...not found
UML running in SKAS0 mode
Adding 20144128 bytes to physical memory to account for exec-shield gap
bootconsole [earlycon0] enabled
PID hash table entries: 2048 (order: 1, 8192 bytes)
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
Memory: 382652k available
SLUB: Genslabs=15, HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
NR_IRQS:15
Calibrating delay loop... 4707.12 BogoMIPS (lpj=23535616)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
Checking for host processor cmov support...Yes
Checking that host ptys support output SIGIO...Yes
Checking that host ptys support SIGIO on close...No, enabling workaround
Using 2.6 host AIO
NET: Registered protocol family 16
bio: create slab <bio-0> at 0
Switching to clocksource itimer
NET: Registered protocol family 2
IP route cache hash table entries: 4096 (order: 2, 16384 bytes)
TCP established hash table entries: 16384 (order: 5, 131072 bytes)
TCP bind hash table entries: 16384 (order: 4, 65536 bytes)
TCP: Hash tables configured (established 16384 bind 16384)
TCP reno registered
UDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
mconsole (version 2) initialized on /home/tfoerste/.uml/uml/mconsole
Checking host MADV_REMOVE support...OK
UML Audio Relay (host dsp = /dev/sound/dsp, host mixer = /dev/sound/mixer)
Host TLS support detected
Detected host type: i386 (GDT indexes 6 to 9)
Registering the id_resolver key type
nfs4filelayout_init: NFSv4 File Layout Driver Registering...
Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
msgmni has been set to 747
io scheduler noop registered
io scheduler cfq registered (default)

EIP: 0073:[<08144be8>] CPU: 0 Not tainted ESP: 007b:20c57f0c EFLAGS: 00210246
    Not tainted
EAX: 00000008 EBX: 0838026c ECX: 083a0930 EDX: 00000000
ESI: 00000000 EDI: 0805a0bb EBP: 20c57f3c DS: 007b ES: 007b
0838a8d8:  [<0807924d>] show_regs+0xed/0x120
0838a8f4:  [<0806154d>] segv+0x24d/0x2c0
0838a9a4:  [<08061613>] segv_handler+0x53/0x80
0838a9cc:  [<08072a1d>] sig_handler_common+0x4d/0xc0
0838ac48:  [<08072bb2>] sig_handler+0x42/0x50
0838ac58:  [<080726ec>] hard_handler+0x6c/0xb0
0838ac7c:  [<b781b40c>] 0xb781b40c

Kernel panic - not syncing: Segfault with no mm
0838a8b4:  [<082f33bb>] dump_stack+0x22/0x24
0838a8cc:  [<082f3420>] panic+0x63/0x170
0838a8f4:  [<08061559>] segv+0x259/0x2c0
0838a9a4:  [<08061613>] segv_handler+0x53/0x80
0838a9cc:  [<08072a1d>] sig_handler_common+0x4d/0xc0
0838ac48:  [<08072bb2>] sig_handler+0x42/0x50
0838ac58:  [<080726ec>] hard_handler+0x6c/0xb0
0838ac7c:  [<b781b40c>] 0xb781b40c


EIP: 0073:[<b781b424>] CPU: 0 Not tainted ESP: 007b:bfad2d20 EFLAGS: 00200246
    Not tainted
EAX: 00000000 EBX: 00006d75 ECX: 00000013 EDX: 00006d75
ESI: 00006d71 EDI: bfad2db4 EBP: bfad2d54 DS: 007b ES: 007b
0838a868:  [<0807924d>] show_regs+0xed/0x120
0838a884:  [<080618ec>] panic_exit+0x2c/0x50
0838a894:  [<0809c3ea>] notifier_call_chain+0x4a/0x70
0838a8bc:  [<0809c533>] atomic_notifier_call_chain+0x23/0x30
0838a8cc:  [<082f3448>] panic+0x8b/0x170
0838a8f4:  [<08061559>] segv+0x259/0x2c0
0838a9a4:  [<08061613>] segv_handler+0x53/0x80
0838a9cc:  [<08072a1d>] sig_handler_common+0x4d/0xc0
0838ac48:  [<08072bb2>] sig_handler+0x42/0x50
0838ac58:  [<080726ec>] hard_handler+0x6c/0xb0
0838ac7c:  [<b781b40c>] 0xb781b40c

Terminated

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

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Re: [uml-devel] current kernel (git version linux-v3.2-6100-ge343a89) crashes

[richard -rw- weinberger]

2012/1/11 Toralf Förster <toralf.foerster@gmx.de>:
> Hello,
>
> with a recent kernel (pre-rc1) I realized this crash and wondering
> whether it is worth to bisect or if there's already a fix flying around :
>
>

Could be this one:
http://marc.info/?l=linux-kernel&m=132616456304183&w=2
http://marc.info/?l=linux-kernel&m=132616483904249&w=2

-- 
Thanks,
//richard

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Re: [uml-devel] current kernel (git version linux-v3.2-6100-ge343a89) crashes

[Toralf Förster]

richard -rw- weinberger wrote at 13:19:34
> 2012/1/11 Toralf Förster <toralf.foerster@gmx.de>:
> > Hello,
> > 
> > with a recent kernel (pre-rc1) I realized this crash and wondering
> 
> > whether it is worth to bisect or if there's already a fix flying around :
> Could be this one:
> http://marc.info/?l=linux-kernel&m=132616456304183&w=2
> http://marc.info/?l=linux-kernel&m=132616483904249&w=2
No, rather this :

tfoerste@n22 ~/devel/linux $ git bisect good
ccbc60d3e19a1b6ae66ca0d89b3da02dde62088b is the first bad commit
commit ccbc60d3e19a1b6ae66ca0d89b3da02dde62088b
Author: Ben Hutchings <ben@decadent.org.uk>
Date:   Thu Nov 24 07:04:39 2011 +0000

    topology: Provide CPU topology in sysfs in !SMP configurations
    
    We should provide topology information to userland even if it's not
    very interesting.  The current code appears to work properly for !SMP
    (tested on i386).
    
    Reference: http://bugs.debian.org/649216
    Reported-by: Marcus Osdoba <marcus.osdoba@googlemail.com>
    Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

:040000 040000 35e6984434f296f290d34ed09e7b01803b43eaea 
12d103589fd05d970d9ac75fd16ad2afc433ac95 M      drivers


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

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Re: [uml-devel] current kernel (git version linux-v3.2-6100-ge343a89) crashes

[Richard Weinberger]

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Hi!

Am 12.01.2012 21:30, schrieb Toralf Förster:
> 
> richard -rw- weinberger wrote at 13:19:34
>> 2012/1/11 Toralf Förster <toralf.foerster@gmx.de>:
>>> Hello,
>>>
>>> with a recent kernel (pre-rc1) I realized this crash and wondering
>>
>>> whether it is worth to bisect or if there's already a fix flying around :
>> Could be this one:
>> http://marc.info/?l=linux-kernel&m=132616456304183&w=2
>> http://marc.info/?l=linux-kernel&m=132616483904249&w=2

These two are the solution to it.

> No, rather this :
> 
> tfoerste@n22 ~/devel/linux $ git bisect good
> ccbc60d3e19a1b6ae66ca0d89b3da02dde62088b is the first bad commit
> commit ccbc60d3e19a1b6ae66ca0d89b3da02dde62088b
> Author: Ben Hutchings <ben@decadent.org.uk>
> Date:   Thu Nov 24 07:04:39 2011 +0000
> 
>     topology: Provide CPU topology in sysfs in !SMP configurations
>     
>     We should provide topology information to userland even if it's not
>     very interesting.  The current code appears to work properly for !SMP
>     (tested on i386).
>     
>     Reference: http://bugs.debian.org/649216
>     Reported-by: Marcus Osdoba <marcus.osdoba@googlemail.com>
>     Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
>     Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
> 
> :040000 040000 35e6984434f296f290d34ed09e7b01803b43eaea 
> 12d103589fd05d970d9ac75fd16ad2afc433ac95 M      drivers
> 
> 
> ?

Yes, this commit is causing the bug.

Thanks,
//richard


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