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<
wens>
blah, computex canceled
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<
mru>
anyone want to try a kernel bug?
<
montjoie>
lets try
<
montjoie>
I have lot of boards to bug
<
mru>
you need a board with something on i2c
<
mru>
an eeprom will do
<
montjoie>
I have some (and anyway I need to buy cheap i2c anything to wire on all boards)
<
montjoie>
so what bug ?
<
mru>
have an eeprom or what?
<
mru>
can you read byte 0 from it using i2cget?
<
montjoie>
I have sensors or eeprom does it change something ?
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<
mru>
doesn't matter what it is as long as it returns data
<
mru>
does "i2cget BUS ADDR 0" print a number?
<
montjoie>
what kernel version do you need ? next is ok ?
<
mru>
any since 2.6.22 I think
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<
montjoie>
I need time to refind which one has it
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<
mru>
anyway, supposing there's something on i2c bus 0 address 0x50, running the command "i2cdump -f -y 0 0x50 i" crashes the system
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<
montjoie>
mru: does address 51 works also ?
<
montjoie>
anyway I will see it soon
<
montjoie>
"Error: Block read failed, return code -6" no crash
<
mru>
any address that has a device
<
montjoie>
with a device no crash
<
montjoie>
i2cdump -f -y 0 0x51 i works for example
<
mru>
what does "i2cget -f -y 0 0x51 0" say?
<
montjoie>
done on a pineh64
<
mru>
ah, it crashes if the first byte has a value greater than 32
<
mru>
or a little more
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<
mru>
hmm, seems like only the busybox i2cdump triggers it
<
mru>
and there's probably a bug there too
<
mru>
but userspace shouldn't be able to crash the kernel
<
montjoie>
Dump I2C bus 0 address 18 => 0x50
<
montjoie>
on a meson-sm1-sei610
<
montjoie>
but yes I use official i2c-tools
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<
mru>
do you have busybox around?
<
mru>
oh, and the bug also depends on which i2c bus driver is used
<
mru>
some work, some don't
<
montjoie>
on what board do you trigger it ?
<
mru>
allwinner a20 and h3 based
<
mru>
no crash on beaglebone
<
mru>
the meson i2c driver looks like it might show the problem
<
montjoie>
I have send jobs with arm64 only, will try arm
<
lvrp16>
mmm apparently kexec doesn't pass the EFI system table
<
lvrp16>
in x86 it does but there's no code for it in the arch/arm64 folder
<
mru>
gah, a more recent busybox version seems to have fixed its bug
<
mru>
I'll have to cook up a special test case
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<
montjoie>
mru: if you know the exact version of busybox I can use it
<
montjoie>
I have a good target sun4i-a10-olinuxino-lime with 50: 50 51 52 53 54 55 56 57 -- -- -- -- -- -- -- --
<
montjoie>
all returning 0xff
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