linux-kernel - Re: Fwd: Re: UML kernel crash of v2.6.36-rcX kernel

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Date:	Sat, 16 Oct 2010 10:55:32 +0200
From:	Toralf Förster <toralf.foerster@....de>
To:	Richard Weinberger <richard@....at>
Cc:	user-mode-linux-devel@...ts.sourceforge.net,
	Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org
Subject: Re: Fwd: Re: UML kernel crash of v2.6.36-rcX kernel

Hello,

I'm currently in the progress of bisecting the issue again- with a fully 
autoamted scripts which doesn't alck a "make clean" - *shame*

However I get with v2.6.35-rc3-173-g3638632 and the attached .config this :

nitializing software serial port version 1
console [mc-1] enabled
 ubda:
EIP: 0073:[<081bfec3>] CPU: 0 Not tainted ESP: 007b:1845aa08 EFLAGS: 00010297
    Not tainted
EAX: 00000000 EBX: 184da000 ECX: 00000001 EDX: 00000000
ESI: 185fb930 EDI: 185f6900 EBP: 1845aa20 DS: 007b ES: 007b
082fab68:  [<08075f5d>] show_regs+0xed/0x120
082fab84:  [<0805e50e>] segv+0x25e/0x2b0
082fac3c:  [<0805e5a1>] segv_handler+0x41/0x60
082fac5c:  [<0806eb64>] sig_handler_common+0x54/0xa0
082facd8:  [<0806ed07>] sig_handler+0x27/0x50
082face8:  [<0806ef5c>] handle_signal+0x5c/0xa0
082fad0c:  [<080712d8>] hard_handler+0x18/0x20
082fad1c:  [<b77de400>] 0xb77de400

Kernel panic - not syncing: Segfault with no mm
082fab50:  [<08277d5b>] dump_stack+0x22/0x24
082fab68:  [<08277dbe>] panic+0x61/0xdb
082fab84:  [<0805e51a>] segv+0x26a/0x2b0
082fac3c:  [<0805e5a1>] segv_handler+0x41/0x60
082fac5c:  [<0806eb64>] sig_handler_common+0x54/0xa0
082facd8:  [<0806ed07>] sig_handler+0x27/0x50
082face8:  [<0806ef5c>] handle_signal+0x5c/0xa0
082fad0c:  [<080712d8>] hard_handler+0x18/0x20
082fad1c:  [<b77de400>] 0xb77de400


EIP: 0073:[<b77de424>] CPU: 0 Not tainted ESP: 007b:bf83a460 EFLAGS: 00000246
    Not tainted
EAX: 00000000 EBX: 00006c83 ECX: 00000013 EDX: 00006c83
ESI: 00006c7f EDI: bf83a4f4 EBP: bf83a494 DS: 007b ES: 007b
082fab04:  [<08075f5d>] show_regs+0xed/0x120
082fab20:  [<0805e7dc>] panic_exit+0x2c/0x50
082fab30:  [<0809928e>] notifier_call_chain+0x3e/0x70
082fab58:  [<08099313>] atomic_notifier_call_chain+0x23/0x30
082fab68:  [<08277de6>] panic+0x89/0xdb
082fab84:  [<0805e51a>] segv+0x26a/0x2b0
082fac3c:  [<0805e5a1>] segv_handler+0x41/0x60
082fac5c:  [<0806eb64>] sig_handler_common+0x54/0xa0
082facd8:  [<0806ed07>] sig_handler+0x27/0x50
082face8:  [<0806ef5c>] handle_signal+0x5c/0xa0
082fad0c:  [<080712d8>] hard_handler+0x18/0x20
082fad1c:  [<b77de400>] 0xb77de400

/home/tfoerste/workspace/bin/start_uml.sh: line 64: 27775 Segmentation fault      
(core dumped) $LINUX ubda=$ROOT_FS ubdb=$SWAP_FS $CD eth0=tuntap,,,$TAP 
mem=256M umid=$USER $TTY $*


Richard Weinberger wrote at 19:46:53
> Hi!
> 
> Can you please post more details.
> What exactly causes the crash?
> phpsysinfo does a lot of stuff.
> On my test bed it works fine.
> 
> Am Freitag 15 Oktober 2010, 11:33:37 schrieben Sie:
> > Hello,
> > 
> > git bisect gave :
> > 
> > tfoerste@n22 ~/devel/linux-2.6 $ git bisect bad
> > 365b18189789bfa1acd9939e6312b8a4b4577b28 is the first bad commit
> > commit 365b18189789bfa1acd9939e6312b8a4b4577b28
> > Author: Christoph Hellwig <hch@....de>
> > Date:   Wed Jul 7 18:53:25 2010 +0200
> > 
> >     add f_flags to struct statfs(64)
> >     
> >     Add a flags field to help glibc implementing statvfs(3) efficiently.
> >     
> >     We copy the flag values from glibc, and add a new ST_VALID flag to
> >     denote that f_flags is implemented.
> >     
> >     Signed-off-by: Christoph Hellwig <hch@....de>
> >     Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
> > :
> > :040000 040000 92f04bf96f0c6bb2df3ddea83a4a27c35985bdcc
> > 
> > e702d8dd95a3897e085bf3fe4919e2dd30a57b47 M      arch
> > 
> > :040000 040000 5705bba0e9a2a61112281f7bb1a1030ef9eb337e
> > 
> > 34fc3ea912581ae7923a15246291387bfc354e47 M      fs
> > 
> > :040000 040000 578a5bb0743aa85adfec7a25f82d440b2ea4db27
> > 
> > 7e96f95b6f1d6ccc9e004b560670638db66b8a93 M      include
> > 
> > 
> > BTW is UML dead ?
> > (I'm asking b/c there're so many different issues - compile errors or the
> > UML kernel crashes during start or during shutdown, independent of the
> > result of the wget issue I was investigating - there are 120 skip'ed
> > commits within the git bisect log beside 46 good and 15 bad commits and I
> > didn't saw any chance to fully automate the bisect)
> 
> Hmm, I did a lot git bisects on UML 2.6.35 to 2.6.36.
> 2.6.36-rc1 does not always compile. You need no apply f3c072a first.
> I've not seen any crashes during bootup nor shutdown. Can you provide some
> more details?
> 
> Thanks,
> //richard


-- 
MfG/Kind regards
Toralf Förster

pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3


View attachment ".config" of type "text/plain" (18146 bytes)