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SubjectRe: current git kernel crashes UML system during boot
From
On Sun, May 30, 2010 at 13:39, Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> 2010/5/27 Toralf Förster <toralf.foerster@gmx.de>:
>> I bisected it to this :

> After fixing the missing/superfluous slab inclusion issues, I bisected
> it further to
>
> commit d61931d89be506372d01a90d1755f6d0a9fafe2d
> Author: Borislav Petkov <borislav.petkov@amd.com>
> Date:   Fri Mar 5 17:34:46 2010 +0100
>
>    x86: Add optimized popcnt variants
>
>    Add support for the hardware version of the Hamming weight function,
>    popcnt, present in CPUs which advertize it under CPUID, Function
>    0x0000_0001_ECX[23]. On CPUs which don't support it, we fallback to the
>    default lib/hweight.c sw versions.
>
>    A synthetic benchmark comparing popcnt with __sw_hweight64 showed almost
>    a 3x speedup on a F10h machine.
>
>    Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
>    LKML-Reference: <20100318112015.GC11152@aftab>
>    Signed-off-by: H. Peter Anvin <hpa@zytor.com>
>
> I reverted that commit on top of current mainline (and fixed up the
> conflicts), and now
> it boots again.

I tried adding

config ARCH_HWEIGHT_CFLAGS
string
default "-fcall-saved-ecx -fcall-saved-edx" if !64_BIT
default "-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx
-fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10
-fcall-saved-r11" if 64_BIT

to arch/um/Kconfig.x86. Now it got a bit further, but it still crashes:

Core dump limits :
soft - 0
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 22290432 bytes to physical memory to account for exec-shield gap
Linux version 2.6.34-08406-g52b0ace-dirty (geert@ayla) (gcc version
4.4.3 (Ubuntu 4.4.3-4ubuntu5) ) #41 Sun May 30 13:54:35 CEST 2010
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 70007
Kernel command line: ubd0=/home/uml/rootfs-amd64
eth0=slirp,,slirp-fullbolt mem=256M root=98:0
PID hash table entries: 2048 (order: 2, 16384 bytes)
Dentry cache hash table entries: 65536 (order: 7, 524288 bytes)
Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)
Memory: 250720k available
Hierarchical RCU implementation.
Verbose stalled-CPUs detection is disabled.
NR_IRQS:15
Calibrating delay loop... 419.43 BogoMIPS (lpj=2097152)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 256
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: 3, 32768 bytes)
TCP established hash table entries: 16384 (order: 6, 262144 bytes)
TCP bind hash table entries: 16384 (order: 5, 131072 bytes)
TCP: Hash tables configured (established 16384 bind 16384)
TCP reno registered
UDP hash table entries: 256 (order: 1, 8192 bytes)
UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
NET: Registered protocol family 1
mconsole (version 2) initialized on /home/geert/.uml/z9aGEj/mconsole
Checking host MADV_REMOVE support...OK
VFS: Disk quotas dquot_6.5.2
Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
msgmni has been set to 489
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
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
Choosing a random ethernet address for device eth0
Netdevice 0 (1e:a2:ad:7c:43:91) : SLIRP backend - command line: 'slirp-fullbolt'
console [mc-1] enabled
ubda:
Modules linked in:
Pid: 0, comm: swapper Not tainted 2.6.34-08406-g52b0ace-dirty
RIP: 0033:[<0000000060110675>]
RSP: 0000000060235810 EFLAGS: 00010297
RAX: 0000000000000000 RBX: 0000000071371800 RCX: 000000000000000a
RDX: 00000000ffff8aed RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000060235820 R08: 0000000000000000 R09: 000000000000001e
R10: 0000000000000001 R11: 00000000602b8c48 R12: 00000000713c4e80
R13: 00000000713c4e80 R14: 0000000071375958 R15: 0000000000000001
Call Trace:
60235308: [<60014a79>] segv+0x70/0x212
60235318: [<60110675>] cfq_close_cooperator+0x39/0x160
602353e8: [<60014c7a>] segv_handler+0x5f/0x65
60235418: [<60021698>] sig_handler_common+0x84/0x98
602354a0: [<60110675>] cfq_close_cooperator+0x39/0x160
60235548: [<600217de>] sig_handler+0x30/0x3b
60235568: [<60021a10>] handle_signal+0x6d/0xa3
602355b8: [<600233c8>] hard_handler+0x10/0x14
60235678: [<60110675>] cfq_close_cooperator+0x39/0x160
60235708: [<60040bb3>] autoremove_wake_function+0x11/0x34
60235728: [<60040bfe>] wake_bit_function+0x28/0x2e
60235738: [<600276db>] __wake_up_common+0x44/0x7a
60235778: [<60075913>] kmem_cache_free+0x54/0x5f
602357b8: [<60057f6e>] mempool_free_slab+0x12/0x14
602357c8: [<6005803c>] mempool_free+0x6f/0x76
602357f8: [<6009ae62>] bio_free+0x4d/0x52
60235808: [<6011066c>] cfq_close_cooperator+0x30/0x160
60235828: [<60110bae>] cfq_completed_request+0x375/0x4db
60235888: [<601053ee>] elv_completed_request+0x4e/0xaf
602358a8: [<601068be>] __blk_put_request+0x37/0xbd
602358d8: [<60106acf>] blk_finish_request+0x18b/0x198
60235918: [<60106d85>] blk_end_bidi_request+0x38/0x4b
60235948: [<60106dca>] blk_end_request+0xb/0xd
60235958: [<6001cf86>] ubd_intr+0x55/0xd7
60235998: [<600527a2>] handle_IRQ_event+0x20/0x9a
602359c8: [<60052889>] __do_IRQ+0x6d/0xb0
602359f8: [<6001217f>] do_IRQ+0x27/0x3f
60235a28: [<6001234f>] sigio_handler+0x4b/0x5f
60235a48: [<60021698>] sig_handler_common+0x84/0x98
60235a68: [<60021745>] real_alarm_handler+0x3c/0x3e
60235af0: [<60095b01>] copy_fs_struct+0xc/0x76
60235b78: [<600217de>] sig_handler+0x30/0x3b
60235b98: [<60021a10>] handle_signal+0x6d/0xa3
60235be8: [<600233c8>] hard_handler+0x10/0x14
Kernel panic - not syncing: Segfault with no mm
Call Trace:
60235218: [<6018fadb>] panic+0xe4/0x14f
60235278: [<6004db6b>] is_module_text_address+0x9/0x11
60235288: [<6003ecdc>] __kernel_text_address+0x65/0x6b
60235290: [<600233c8>] hard_handler+0x10/0x14
602352a8: [<60013a12>] show_trace+0x8e/0x95
602352d8: [<60026e34>] show_regs+0x2b/0x2f
60235308: [<60014b03>] segv+0xfa/0x212
60235318: [<60110675>] cfq_close_cooperator+0x39/0x160
602353e8: [<60014c7a>] segv_handler+0x5f/0x65
60235418: [<60021698>] sig_handler_common+0x84/0x98
602354a0: [<60110675>] cfq_close_cooperator+0x39/0x160
60235548: [<600217de>] sig_handler+0x30/0x3b
60235568: [<60021a10>] handle_signal+0x6d/0xa3
602355b8: [<600233c8>] hard_handler+0x10/0x14
60235678: [<60110675>] cfq_close_cooperator+0x39/0x160
60235708: [<60040bb3>] autoremove_wake_function+0x11/0x34
60235728: [<60040bfe>] wake_bit_function+0x28/0x2e
60235738: [<600276db>] __wake_up_common+0x44/0x7a
60235778: [<60075913>] kmem_cache_free+0x54/0x5f
602357b8: [<60057f6e>] mempool_free_slab+0x12/0x14
602357c8: [<6005803c>] mempool_free+0x6f/0x76
602357f8: [<6009ae62>] bio_free+0x4d/0x52
60235808: [<6011066c>] cfq_close_cooperator+0x30/0x160
60235828: [<60110bae>] cfq_completed_request+0x375/0x4db
60235888: [<601053ee>] elv_completed_request+0x4e/0xaf
602358a8: [<601068be>] __blk_put_request+0x37/0xbd
602358d8: [<60106acf>] blk_finish_request+0x18b/0x198
60235918: [<60106d85>] blk_end_bidi_request+0x38/0x4b
60235948: [<60106dca>] blk_end_request+0xb/0xd
60235958: [<6001cf86>] ubd_intr+0x55/0xd7
60235998: [<600527a2>] handle_IRQ_event+0x20/0x9a
602359c8: [<60052889>] __do_IRQ+0x6d/0xb0
602359f8: [<6001217f>] do_IRQ+0x27/0x3f
60235a28: [<6001234f>] sigio_handler+0x4b/0x5f
60235a48: [<60021698>] sig_handler_common+0x84/0x98
60235a68: [<60021745>] real_alarm_handler+0x3c/0x3e
60235af0: [<60095b01>] copy_fs_struct+0xc/0x76
60235b78: [<600217de>] sig_handler+0x30/0x3b
60235b98: [<60021a10>] handle_signal+0x6d/0xa3
60235be8: [<600233c8>] hard_handler+0x10/0x14


Modules linked in:
Pid: 0, comm: swapper Not tainted 2.6.34-08406-g52b0ace-dirty
RIP: 0000:[<0000000000000000>]
RSP: 0000000000000000 EFLAGS: 00000000
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Call Trace:
602351a8: [<60014de7>] panic_exit+0x2f/0x45
602351b0: [<600233c8>] hard_handler+0x10/0x14
602351c8: [<600441ea>] notifier_call_chain+0x32/0x5e
60235208: [<60044230>] atomic_notifier_call_chain+0xf/0x11
60235218: [<6018faf6>] panic+0xff/0x14f
60235278: [<6004db6b>] is_module_text_address+0x9/0x11
60235288: [<6003ecdc>] __kernel_text_address+0x65/0x6b
60235290: [<600233c8>] hard_handler+0x10/0x14
602352a8: [<60013a12>] show_trace+0x8e/0x95
602352d8: [<60026e34>] show_regs+0x2b/0x2f
60235308: [<60014b03>] segv+0xfa/0x212
60235318: [<60110675>] cfq_close_cooperator+0x39/0x160
602353e8: [<60014c7a>] segv_handler+0x5f/0x65
60235418: [<60021698>] sig_handler_common+0x84/0x98
602354a0: [<60110675>] cfq_close_cooperator+0x39/0x160
60235548: [<600217de>] sig_handler+0x30/0x3b
60235568: [<60021a10>] handle_signal+0x6d/0xa3
602355b8: [<600233c8>] hard_handler+0x10/0x14
60235678: [<60110675>] cfq_close_cooperator+0x39/0x160
60235708: [<60040bb3>] autoremove_wake_function+0x11/0x34
60235728: [<60040bfe>] wake_bit_function+0x28/0x2e
60235738: [<600276db>] __wake_up_common+0x44/0x7a
60235778: [<60075913>] kmem_cache_free+0x54/0x5f
602357b8: [<60057f6e>] mempool_free_slab+0x12/0x14
602357c8: [<6005803c>] mempool_free+0x6f/0x76
602357f8: [<6009ae62>] bio_free+0x4d/0x52
60235808: [<6011066c>] cfq_close_cooperator+0x30/0x160
60235828: [<60110bae>] cfq_completed_request+0x375/0x4db
60235888: [<601053ee>] elv_completed_request+0x4e/0xaf
602358a8: [<601068be>] __blk_put_request+0x37/0xbd
602358d8: [<60106acf>] blk_finish_request+0x18b/0x198
60235918: [<60106d85>] blk_end_bidi_request+0x38/0x4b
60235948: [<60106dca>] blk_end_request+0xb/0xd
60235958: [<6001cf86>] ubd_intr+0x55/0xd7
60235998: [<600527a2>] handle_IRQ_event+0x20/0x9a
602359c8: [<60052889>] __do_IRQ+0x6d/0xb0
602359f8: [<6001217f>] do_IRQ+0x27/0x3f
60235a28: [<6001234f>] sigio_handler+0x4b/0x5f
60235a48: [<60021698>] sig_handler_common+0x84/0x98
60235a68: [<60021745>] real_alarm_handler+0x3c/0x3e
60235af0: [<60095b01>] copy_fs_struct+0xc/0x76
60235b78: [<600217de>] sig_handler+0x30/0x3b
60235b98: [<60021a10>] handle_signal+0x6d/0xa3
60235be8: [<600233c8>] hard_handler+0x10/0x14
Kernel panic - not syncing: Kernel mode signal 4
Call Trace:
71040128: [<6018fadb>] panic+0xe4/0x14f
71040218: [<600146ee>]Terminated

Gr{oetje,eeting}s,
Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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