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2.6.25-rc3-mm1 - PROFILE_LIKELY redux..

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To: Andrew Morton <akpm@...>
Cc: <linux-kernel@...>
Date: Wednesday, March 5, 2008 - 3:21 am

On Tue, 04 Mar 2008 01:19:28 PST, Andrew Morton said:

x86_64, mostly 64-bit userspace, Dell Latitude D820, T7200 Core2 Duo...

So I gave CONFIG_PROFILE_LIKELY another try, and this time the thing actually
booted and got into userspace, but stuff started dying in rc.sysinit.

According to dmesg, they all died at the same place:

[    4.841459] rename_device[686]: segfault at ffffffffff7009be ip ffffffffff7009be sp 7fff7ccfb958 error 14
[    4.842384] rename_device[984]: segfault at ffffffffff7009be ip ffffffffff7009be sp 7fffb6fe9c68 error 14
[    4.843298] rename_device[981]: segfault at ffffffffff7009be ip ffffffffff7009be sp 7fffc18504c8 error 14
[    4.844184] rename_device[983]: segfault at ffffffffff7009be ip ffffffffff7009be sp 7fff512c8f48 error 14
[    6.099486] rename_device[1513]: segfault at ffffffffff7009be ip ffffffffff7009be sp 7fff47e88ad8 error 14
[    5.769289] rename_device[1516]: segfault at ffffffffff7009be ip ffffffffff7009be sp 7fffa317edd8 error 14
[    7.457229] fsck.ext3[1576]: segfault at ffffffffff7009be ip ffffffffff7009be sp 7fff3be947f8 error 14

(Note that not everything died - some renames, an fsck, and maybe I missed
something - but a lot of other stuff worked (dmesg, grep, cat, uname that I
ran, and a lot of things that rc.sysinit invoked - so that may tell us
something...)

/proc/self/maps says that's near:

ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]

And my System.map says:

ffffffff80855a0c A __bss_stop
ffffffff80855a0c A _end
ffffffffff600000 T vgettimeofday
ffffffffff600100 t vread_tsc
ffffffffff600122 t vread_hpet
ffffffffff600140 D __vsyscall_gtod_data
ffffffffff600400 T vtime
ffffffffff600800 T vgetcpu
ffffffffff600870 D __vgetcpu_mode
ffffffffff600880 D __jiffies
ffffffffff600c00 T venosys_1
ffffffffff700000 A VDSO64_PRELINK
ffffffffff7005b0 A VDSO64_jiffies
ffffffffff7005b8 A VDSO64_vgetcpu_mode
ffffffffff7005c0 A VDSO64_vsyscall_gtod_data
<file ends there>

So we're in the same 4K as the VDSO64_* values, but some 0x4fe past the
gtod_data.  Anybody got a hint as to what the heck it was doing?
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Messages in current thread:
2.6.25-rc3-mm1, Andrew Morton, (Tue Mar 4, 5:19 am)
Re: 2.6.25-rc3-mm1 - BUG at system shutdown time, Andrew Morton, (Wed Mar 12, 3:32 am)
Re: 2.6.25-rc3-mm1 - BUG at system shutdown time, Ingo Molnar, (Fri Mar 21, 9:41 am)
Re: 2.6.25-rc3-mm1 - BUG at system shutdown time, Ingo Molnar, (Fri Mar 21, 3:58 pm)
Re: 2.6.25-rc3-mm1 - BUG at system shutdown time, Ingo Molnar, (Fri Mar 21, 4:12 pm)
Re: 2.6.25-rc3-mm1 - BUG at system shutdown time, Andrew Morton, (Wed Mar 12, 10:32 pm)
Re: 2.6.25-rc3-mm1 - BUG at system shutdown time, Andrew Morton, (Thu Mar 13, 12:27 am)
Re: 2.6.25-rc3-mm1 - BUG at system shutdown time, Andrew Morton, (Fri Mar 7, 2:16 am)
Re: 2.6.25-rc3-mm1 - BUG at system shutdown time, Thomas Gleixner, (Fri Mar 7, 4:06 am)
Re: 2.6.25-rc3-mm1 - BUG at system shutdown time, Thomas Gleixner, (Fri Mar 7, 4:34 am)
2.6.25-rc3-mm1 ppc64 boot hang, Badari Pulavarty, (Wed Mar 5, 5:34 pm)
Re: 2.6.25-rc3-mm1 ppc64 boot hang, Andrew Morton, (Wed Mar 5, 5:54 pm)
Re: 2.6.25-rc3-mm1 ppc64 boot hang, Stephen Rothwell, (Wed Mar 5, 7:17 pm)
Re: 2.6.25-rc3-mm1 ppc64 boot hang, Badari Pulavarty, (Wed Mar 5, 6:35 pm)
2.6.25-rc3-mm1 - PROFILE_LIKELY redux.., , (Wed Mar 5, 3:21 am)
Re: 2.6.25-rc3-mm1 - PROFILE_LIKELY redux.., Andi Kleen, (Wed Mar 5, 1:45 pm)
Re: 2.6.25-rc3-mm1 - PROFILE_LIKELY redux.., Andi Kleen, (Wed Mar 5, 5:56 pm)
Re: 2.6.25-rc3-mm1 - PROFILE_LIKELY redux.., Andrew Morton, (Wed Mar 5, 2:02 pm)
Re: 2.6.25-rc3-mm1 - PROFILE_LIKELY redux.., Andrew Morton, (Wed Mar 5, 7:49 pm)
Re: 2.6.25-rc3-mm1 - PROFILE_LIKELY redux.., Andi Kleen, (Wed Mar 5, 2:22 pm)
Re: 2.6.25-rc3-mm1, Pavel Emelyanov, (Wed Mar 5, 9:04 am)
Re: 2.6.25-rc3-mm1, Greg KH, (Wed Mar 5, 12:40 pm)
Re: 2.6.25-rc3-mm1, Pavel Emelyanov, (Wed Mar 5, 12:59 pm)
Re: 2.6.25-rc3-mm1, Greg KH, (Wed Mar 5, 1:07 pm)
Re: 2.6.25-rc3-mm1, Kay Sievers, (Wed Mar 5, 9:31 am)
Re: 2.6.25-rc3-mm1, Pavel Emelyanov, (Wed Mar 5, 9:38 am)
Re: 2.6.25-rc3-mm1, Kay Sievers, (Wed Mar 5, 9:54 am)
Re: 2.6.25-rc3-mm1, Pavel Emelyanov, (Wed Mar 5, 10:28 am)
Re: 2.6.25-rc3-mm1 (SYSFS=n breaks module engine), Pavel Emelyanov, (Wed Mar 5, 9:12 am)
prctl(0x8) -&gt; EINVAL [Was: 2.6.25-rc3-mm1], Jiri Slaby, (Wed Mar 5, 6:51 am)
Re: prctl(0x8) -&gt; EINVAL [Was: 2.6.25-rc3-mm1], Serge E. Hallyn, (Wed Mar 5, 10:06 am)
Re: prctl(0x8) -&gt; EINVAL [Was: 2.6.25-rc3-mm1], Andrew Morgan, (Sun Mar 9, 12:28 pm)
Re: prctl(0x8) -&gt; EINVAL [Was: 2.6.25-rc3-mm1], Jiri Slaby, (Wed Mar 5, 11:18 am)
Re: prctl(0x8) -&gt; EINVAL [Was: 2.6.25-rc3-mm1], Jiri Slaby, (Wed Mar 5, 6:59 am)
Re: 2.6.25-rc3-mm1 (9p docs), Randy Dunlap, (Tue Mar 4, 5:26 pm)
Re: 2.6.25-rc3-mm1 (9p docs), Eric Van Hensbergen, (Tue Mar 4, 5:43 pm)
Re: 2.6.25-rc3-mm1 (wakeup), Randy Dunlap, (Tue Mar 4, 4:24 pm)
Re: 2.6.25-rc3-mm1 (wakeup), Rafael J. Wysocki, (Tue Mar 4, 6:33 pm)
Re: 2.6.25-rc3-mm1 (wakeup), Sam Ravnborg, (Wed Mar 5, 3:40 am)
[BUG] 2.6.25-rc3-mm1 kernel bug while running libhugetlbfs, Kamalesh Babulal, (Tue Mar 4, 3:20 pm)
[PATCH 2.6.25-rc3-mm1] fix ext2 borkage, Hugh Dickins, (Tue Mar 4, 3:12 pm)
Re: 2.6.25-rc3-mm1 (CCISS), Randy Dunlap, (Tue Mar 4, 12:45 pm)
RE: 2.6.25-rc3-mm1 (CCISS), Miller, Mike (OS Dev), (Tue Mar 4, 1:02 pm)
Re: 2.6.25-rc3-mm1 (CCISS), Randy Dunlap, (Tue Mar 4, 1:14 pm)
Re: 2.6.25-rc3-mm1 (CCISS), Jens Axboe, (Tue Mar 4, 2:14 pm)
Re: 2.6.25-rc3-mm1 (IDE), Randy Dunlap, (Tue Mar 4, 12:35 pm)
Re: 2.6.25-rc3-mm1 (IDE), Bartlomiej Zolnierkiewicz..., (Thu Mar 6, 5:14 pm)
[BUG] 2.6.25-rc3-mm1 kernel panic while bootup on powerpc (), Kamalesh Babulal, (Tue Mar 4, 9:12 am)
Re: [BUG] 2.6.25-rc3-mm1 kernel panic while bootup on powerp..., Benjamin Herrenschmidt, (Wed Mar 5, 4:22 am)
Re: [BUG] 2.6.25-rc3-mm1 kernel panic while bootup on powerp..., Benjamin Herrenschmidt, (Wed Mar 5, 8:03 pm)
Re: [BUG] 2.6.25-rc3-mm1 kernel panic while bootup on powerp..., Benjamin Herrenschmidt, (Wed Mar 5, 8:52 pm)
Re: [BUG] 2.6.25-rc3-mm1 kernel panic while bootup on powerp..., Benjamin Herrenschmidt, (Wed Mar 5, 4:23 am)
Re: 2.6.25-rc3-mm1, Cornelia Huck, (Tue Mar 4, 7:59 am)
Re: 2.6.25-rc3-mm1, Greg KH, (Tue Mar 4, 3:35 pm)
speck-geostationary