On 7/25/07, Andrew Morton <[email protected]> wrote:
On Thu, 5 Jul 2007 18:52:27 -0700 (PDT) Joshua Wise <[email protected]> wrote:
> Background:
> This patch is a follow-on to "Info dump on Oops or panic()" [1].
>
> On some architectures, the kernel printed some information on the running
> kernel, but not on all architectures. The information printed was generally
> the version and build number, but it was not located in a consistant place,
> and some architectures did not print it at all.
>
> Description:
> This patch uses the already-existing die_chain to print utsname information
> on Oops. This patch also removes the architecture-specific utsname
> printers. To avoid crashing the system further (and hence not printing the
> Oops) in the case where the system is so hopelessly smashed that utsname
> might be destroyed, we vsprintf the utsname data into a static buffer
> first, and then just print that on crash.
>
> Testing:
> I wrote a module that does a *(int*)0 = 0; and observed that I got my
> utsname data printed.
>
> Potential impact:
> This adds another line to the Oops output, causing the first few lines to
> potentially scroll off the screen. This also adds a few more pointer
> dereferences in the Oops path, because it adds to the die_chain notifier
> chain, reducing the likelihood that the Oops will be printed if there is
> very bad memory corruption.
There are strange happenings due to this patch on i386:
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
hdc: max request size: 128KiB
hdc: 156355584 sectors (80054 MB) w/1819KiB Cache, CHS=65535/16/63, UDMA(33)
hdc: cache flushes supported
hdc:<0>Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
hdc1 hdc2 hdc3 hdc4 <<0>Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
hdc5<0>Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
hdc6 >
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
initcall 0xc052a060: idedisk_init+0x0/0x10() returned 0.
initcall 0xc052a060 ran for 38 msecs: idedisk_init+0x0/0x10()
Calling initcall 0xc052a070: ide_cdrom_init+0x0/0x10()
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
initcall 0xc052a070: ide_cdrom_init+0x0/0x10() returned 0.
initcall 0xc052a070 ran for 3 msecs: ide_cdrom_init+0x0/0x10()
Calling initcall 0xc052a080: idetape_init+0x0/0x90()
initcall 0xc052a080: idetape_init+0x0/0x90() returned 0.
initcall 0xc052a080 ran for 0 msecs: idetape_init+0x0/0x90()
Calling initcall 0xc052a110: idefloppy_init+0x0/0x20()
ide-floppy driver 0.99.newide
initcall 0xc052a110: idefloppy_init+0x0/0x20() returned 0.
initcall 0xc052a110 ran for 0 msecs: idefloppy_init+0x0/0x20()
Calling initcall 0xc052a3e0: spi_transport_init+0x0/0x30()
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
Linux 2.6.23-rc1-mm1 #7 SMP Tue Jul 24 22:34:40 PDT 2007 i686
initcall 0xc052a3e0: spi_transport_init+0x0/0x30() returned 0.
initcall 0xc052a3e0 ran for 3 msecs: spi_transport_init+0x0/0x30()
Calling initcall 0xc052a410: fc_transport_init+0x0/0x50()
initcall 0xc052a410: fc_transport_init+0x0/0x50() returned 0.
initcall 0xc052a410 ran for 0 msecs: fc_transport_init+0x0/0x50()
Calling initcall 0xc052a460: init_sd+0x0/0x90()
initcall 0xc052a460: init_sd+0x0/0x90() returned 0.
initcall 0xc052a460 ran for 0 msecs: init_sd+0x0/0x90()
and it gets no further.
I'll drop it - let's start again?
Ugh, there's a silly mistake there -- the notifier call function is missing a
(diecode == DIE_OOPS) check. Not all die notifications are oopsen -- we
need to filter out the cases we don't care about.
Satyam
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