[systemd-bugs] [Bug 85782] random freeze at boot with kernel 3.17.x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85782

--- Comment #6 from Barto <mister.freeman at laposte.net> ---
yes it's a kernel problem,

I'm sure now because after investigations I found the guilty, it's the commit
74665016086615bbaa3fa6f83af410a0a4e029ee "( scsi: convert
host_busy to atomic_t )" who has introduced the bug,

the bug is triggered if a slow sata/ide device ( like a DVD burner ) is mixed
with a sata/ide hardisk AND if the motherboard or the sata/ide controler
doesn't support AHCI, a random hang will occur every 5~10 boots, systemd will
stop and some error messages will be displayed because sata/ide devices
suddenly stop :


https://lkml.org/lkml/2014/11/19/634

a patch is available :

https://bugzilla.kernel.org/attachment.cgi?id=158411

but I don't know if linux developpers will use this patch for kernel 3.18,

it's a nasty bug and some people are not aware about this bug ( bug introduced
with kernel 3.17 ), but they will likely have this bug if they mix slow
SATA/IDE devices with fast devices on a sata/ide controler who doesn't support
AHCI

the bug report :

https://bugzilla.kernel.org/show_bug.cgi?id=87581

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