[linux-6.6.y] x86/mce: Add NMIs setup in machine_check func #369
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zhaoxin inclusion
category: other
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This will lead to console_owner_lock issue and HPET dead loop issue.
For example, The HPET dead loop issue:
CPU x CPU x
---- ----
read_hpet()
arch_spin_trylock(&hpet.lock)
[CPU x got the hpet.lock] #MCE happened
do_machine_check()
mce_panic()
panic()
kmsg_dump()
pstore_dump()
pstore_record_init()
ktime_get_real_fast_ns()
read_hpet()
[dead loops]
This may lead to read_hpet dead loops.
The console_owner_lock issue is similar.
To avoid these issues, add NMIs setup When Handling #MC Exceptions.
Signed-off-by: leoliu-oc <[email protected]>
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leoliu-oc
changed the title
Avenger-285714
merged commit a4f1369
into
deepin-community:linux-6.6.y
#MC is a NMI-like exception. But do not do any setup that NMIs need.
This will lead to console_owner_lock issue and HPET dead loop issue.
This may lead to read_hpet dead loops.
The console_owner_lock issue is similar.
To avoid these issues, add NMIs setup When Handling #MC Exceptions.