Date:	Mon, 14 Jun 2010 11:49:24 +0200
From:	Toralf Förster <toralf.foerster@....de>
To:	Borislav Petkov <borislav.petkov@....com>
Cc:	Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"user-mode-linux-devel@...ts.sourceforge.net" 
	<user-mode-linux-devel@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86, hweight: Fix UML boot crash


Borislav Petkov wrote at 16:10:58
> Did you do 'make mrproper' before rebuilding UML with it?

Today I started with a clean git tree (cloned Linus tree) and got this :

foerste@n22 ~ $ 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 23175168 bytes to physical memory to account for exec-shield gap
Linux version 2.6.35-rc3 (tfoerste@n22) (gcc version 4.4.3 (Gentoo 4.4.3-r2 
p1.2) ) #1 Mon Jun 14 11:45:10 CEST 2010
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 70637
Kernel command line: ubda=/home/tfoerste/virtual/uml/gentoo_root_fs 
ubdb=/home/tfoerste/virtual/uml/swap_fs eth0=tuntap,,,192.168.0.253 mem=256M 
root=98:0
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: 254232k available
Hierarchical RCU implementation.
        RCU-based detection of stalled CPUs is disabled.
        Verbose stalled-CPUs detection is disabled.
NR_IRQS:15
Calibrating delay loop... 4692.37 BogoMIPS (lpj=23461888)
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 udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
mconsole (version 2) initialized on /home/tfoerste/.uml/tfoerste/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)
Installing knfsd (copyright (C) 1996 okir@...ad.swb.de).
msgmni has been set to 496
alg: No test for stdrng (krng)
io scheduler noop registered
io scheduler cfq registered (default)
tun: Universal TUN/TAP device driver, 1.6
tun: (C) 1999-2004 Max Krasnyansky <maxk@...lcomm.com>
TCP cubic registered
NET: Registered protocol family 17
Initialized stdio console driver
Console initialized on /dev/tty0
console [tty0] enabled
Initializing software serial port version 1
console [mc-1] enabled
 ubda:
EIP: 0073:[<081c4fcb>] CPU: 0 Not tainted ESP: 007b:08300b40 EFLAGS: 00010297
    Not tainted
EAX: 00000000 EBX: 190d2000 ECX: ffff8aea EDX: 00000000
ESI: 191f4930 EDI: 191ef900 EBP: 191f4930 DS: 007b ES: 007b
08300794:  [<0805e65f>] segv_handler+0x3f/0x60
083007a4:  [<081c4fcb>] cfq_close_cooperator+0x4b/0x180
083007b0:  [<0806eec5>] sig_handler_common+0x55/0xa0
083007f0:  [<081c4fcb>] cfq_close_cooperator+0x4b/0x180
08300828:  [<0806f063>] sig_handler+0x23/0x40
08300830:  [<0806f2bd>] handle_signal+0x5d/0xa0
08300850:  [<080715f7>] hard_handler+0x17/0x20
0830089c:  [<081c4fcb>] cfq_close_cooperator+0x4b/0x180
08300a4c:  [<0807a3eb>] T.696+0x9b/0xc0
08300a74:  [<08079425>] enqueue_task+0x45/0x60
08300a94:  [<0807945f>] activate_task+0x1f/0x30
08300aa0:  [<080794d8>] try_to_wake_up+0x68/0xa0
08300acc:  [<0809369f>] autoremove_wake_function+0x2f/0x60
08300ae8:  [<0807754f>] __wake_up_common+0x4f/0x80
08300b18:  [<08077837>] __wake_up+0x47/0x60
08300b3c:  [<081c4fc6>] cfq_close_cooperator+0x46/0x180
08300b58:  [<081c5440>] cfq_completed_request+0x2a0/0x560
08300b90:  [<081b7fce>] elv_completed_request+0x7e/0xf0
08300ba8:  [<081b98f6>] __blk_put_request+0x36/0xf0
08300bc0:  [<081b9b26>] blk_finish_request+0x176/0x1d0
08300be0:  [<081b9ea1>] blk_end_bidi_request+0x41/0x60
08300bf4:  [<08068e8d>] ubd_intr+0x2d/0xf0
08300c14:  [<080a6b32>] handle_IRQ_event+0x32/0xc0
08300c34:  [<080a6c1b>] __do_IRQ+0x5b/0xb0
08300c50:  [<0805b364>] do_IRQ+0x24/0x40
08300c5c:  [<0805b59b>] sigio_handler+0x5b/0x80
08300c70:  [<0806eec5>] sig_handler_common+0x55/0xa0
08300c80:  [<0806efb5>] real_alarm_handler+0x35/0x40
08300cbc:  [<080739f0>] __delay+0x20/0x30
08300ce8:  [<0806f063>] sig_handler+0x23/0x40
08300cf0:  [<0806f2bd>] handle_signal+0x5d/0xa0
08300d10:  [<080715f7>] hard_handler+0x17/0x20

Kernel panic - not syncing: Segfault with no mm
083006c8:  [<0827feff>] panic+0x60/0xd0
083006e0:  [<0805e5dc>] segv+0x2ac/0x2f0
08300794:  [<0805e65f>] segv_handler+0x3f/0x60
083007a4:  [<081c4fcb>] cfq_close_cooperator+0x4b/0x180
083007b0:  [<0806eec5>] sig_handler_common+0x55/0xa0
083007f0:  [<081c4fcb>] cfq_close_cooperator+0x4b/0x180
08300828:  [<0806f063>] sig_handler+0x23/0x40
08300830:  [<0806f2bd>] handle_signal+0x5d/0xa0
08300850:  [<080715f7>] hard_handler+0x17/0x20
0830089c:  [<081c4fcb>] cfq_close_cooperator+0x4b/0x180
08300a4c:  [<0807a3eb>] T.696+0x9b/0xc0
08300a74:  [<08079425>] enqueue_task+0x45/0x60
08300a94:  [<0807945f>] activate_task+0x1f/0x30
08300aa0:  [<080794d8>] try_to_wake_up+0x68/0xa0
08300acc:  [<0809369f>] autoremove_wake_function+0x2f/0x60
08300ae8:  [<0807754f>] __wake_up_common+0x4f/0x80
08300b18:  [<08077837>] __wake_up+0x47/0x60
08300b3c:  [<081c4fc6>] cfq_close_cooperator+0x46/0x180
08300b58:  [<081c5440>] cfq_completed_request+0x2a0/0x560
08300b90:  [<081b7fce>] elv_completed_request+0x7e/0xf0
08300ba8:  [<081b98f6>] __blk_put_request+0x36/0xf0
08300bc0:  [<081b9b26>] blk_finish_request+0x176/0x1d0
08300be0:  [<081b9ea1>] blk_end_bidi_request+0x41/0x60
08300bf4:  [<08068e8d>] ubd_intr+0x2d/0xf0
08300c14:  [<080a6b32>] handle_IRQ_event+0x32/0xc0
08300c34:  [<080a6c1b>] __do_IRQ+0x5b/0xb0
08300c50:  [<0805b364>] do_IRQ+0x24/0x40
08300c5c:  [<0805b59b>] sigio_handler+0x5b/0x80
08300c70:  [<0806eec5>] sig_handler_common+0x55/0xa0
08300c80:  [<0806efb5>] real_alarm_handler+0x35/0x40
08300cbc:  [<080739f0>] __delay+0x20/0x30
08300ce8:  [<0806f063>] sig_handler+0x23/0x40
08300cf0:  [<0806f2bd>] handle_signal+0x5d/0xa0
08300d10:  [<080715f7>] hard_handler+0x17/0x20


EIP: 0000:[<00000000>] CPU: 0 Not tainted EFLAGS: 00000000
    Not tainted
EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000
ESI: 00000000 EDI: 00000000 EBP: 00000000 DS: 0000 ES: 0000
083006a4:  [<080986ac>] notifier_call_chain+0x3c/0x70
083006c8:  [<0827ff27>] panic+0x88/0xd0
083006e0:  [<0805e5dc>] segv+0x2ac/0x2f0
08300794:  [<0805e65f>] segv_handler+0x3f/0x60
083007a4:  [<081c4fcb>] cfq_close_cooperator+0x4b/0x180
083007b0:  [<0806eec5>] sig_handler_common+0x55/0xa0
083007f0:  [<081c4fcb>] cfq_close_cooperator+0x4b/0x180
08300828:  [<0806f063>] sig_handler+0x23/0x40
08300830:  [<0806f2bd>] handle_signal+0x5d/0xa0
08300850:  [<080715f7>] hard_handler+0x17/0x20
0830089c:  [<081c4fcb>] cfq_close_cooperator+0x4b/0x180
08300a4c:  [<0807a3eb>] T.696+0x9b/0xc0
08300a74:  [<08079425>] enqueue_task+0x45/0x60
08300a94:  [<0807945f>] activate_task+0x1f/0x30
08300aa0:  [<080794d8>] try_to_wake_up+0x68/0xa0
08300acc:  [<0809369f>] autoremove_wake_function+0x2f/0x60
08300ae8:  [<0807754f>] __wake_up_common+0x4f/0x80
08300b18:  [<08077837>] __wake_up+0x47/0x60
08300b3c:  [<081c4fc6>] cfq_close_cooperator+0x46/0x180
08300b58:  [<081c5440>] cfq_completed_request+0x2a0/0x560
08300b90:  [<081b7fce>] elv_completed_request+0x7e/0xf0
08300ba8:  [<081b98f6>] __blk_put_request+0x36/0xf0
08300bc0:  [<081b9b26>] blk_finish_request+0x176/0x1d0
08300be0:  [<081b9ea1>] blk_end_bidi_request+0x41/0x60
08300bf4:  [<08068e8d>] ubd_intr+0x2d/0xf0
08300c14:  [<080a6b32>] handle_IRQ_event+0x32/0xc0
08300c34:  [<080a6c1b>] __do_IRQ+0x5b/0xb0
08300c50:  [<0805b364>] do_IRQ+0x24/0x40
08300c5c:  [<0805b59b>] sigio_handler+0x5b/0x80
08300c70:  [<0806eec5>] sig_handler_common+0x55/0xa0
08300c80:  [<0806efb5>] real_alarm_handler+0x35/0x40
08300cbc:  [<080739f0>] __delay+0x20/0x30
08300ce8:  [<0806f063>] sig_handler+0x23/0x40
08300cf0:  [<0806f2bd>] handle_signal+0x5d/0xa0
08300d10:  [<080715f7>] hard_handler+0x17/0x20

Terminated


-- 
MfG/Kind regards
Toralf Förster

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


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