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SubjectRegression: spurious 8259A interrupt: IRQ7 appears in 2.6.19-rc6-git10
Hi,
I have just tested for fun the upcoming release candidate and have
found the following difference with a 'spurious 8259A interrupt:
IRQ7' message, possibly triggered by the

--- linux-2.6.19-rc5.txt 2006-11-28 19:23:54.145722821 +0100
+++ linux-2.6.19-rc6-git10.txt 2006-11-28 19:14:04.579597162 +0100
@@ -1,4 +1,4 @@
-Linux version 2.6.19-rc5 (root@vrapenec) (gcc version 4.1.1 (Gentoo
4.1.1-r1)) #1 Tue Nov 14 02:54:07 CET 2006
+Linux version 2.6.19-rc6-git10 (root@vrapenec) (gcc version 4.1.1
(Gentoo 4.1.1-r2)) #1 Tue Nov 28 17:56:27 CET 2006
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
@@ -43,7 +43,7 @@
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
-CPU 0 irqstacks, hard=c147f000 soft=c147e000
+CPU 0 irqstacks, hard=c1480000 soft=c147f000
PID hash table entries: 4096 (order: 12, 16384 bytes)
Console: colour VGA+ 80x25
Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo
Molnar
@@ -88,7 +88,8 @@
hard-safe-A + irqs-on/21: ok | ok | ok |
soft-safe-A + irqs-on/21: ok | ok | ok |
hard-safe-A + unsafe-B #1/123: ok | ok | ok |
- soft-safe-A + unsafe-B #1/123: ok | ok | ok |
+ soft-safe-A + unsafe-B #1/123: ok | ok | ok |<7>spurious
8259A interrupt: IRQ7.
+
hard-safe-A + unsafe-B #1/132: ok | ok | ok |
soft-safe-A + unsafe-B #1/132: ok | ok | ok |
hard-safe-A + unsafe-B #1/213: ok | ok | ok |



Here is the relevant part of full dmesg output from 2.6.19-rc6-git10:

Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
... MAX_LOCKDEP_SUBCLASSES: 8
... MAX_LOCK_DEPTH: 30
... MAX_LOCKDEP_KEYS: 2048
... CLASSHASH_SIZE: 1024
... MAX_LOCKDEP_ENTRIES: 8192
... MAX_LOCKDEP_CHAINS: 8192
... CHAINHASH_SIZE: 4096
memory used by lock dependency info: 904 kB
per task-struct memory footprint: 1200 bytes
------------------------
| Locking API testsuite:
----------------------------------------------------------------------------
| spin |wlock |rlock |mutex | wsem
| rsem |
--------------------------------------------------------------------------
A-A deadlock: ok | ok | ok | ok | ok
| ok |
A-B-B-A deadlock: ok | ok | ok | ok | ok
| ok |
A-B-B-C-C-A deadlock: ok | ok | ok | ok | ok
| ok |
A-B-C-A-B-C deadlock: ok | ok | ok | ok | ok
| ok |
A-B-B-C-C-D-D-A deadlock: ok | ok | ok | ok | ok
| ok |
A-B-C-D-B-D-D-A deadlock: ok | ok | ok | ok | ok
| ok |
A-B-C-D-B-C-D-A deadlock: ok | ok | ok | ok | ok
| ok |
double unlock: ok | ok | ok | ok | ok
| ok |
initialize held: ok | ok | ok | ok | ok
| ok |
bad unlock order: ok | ok | ok | ok | ok
| ok |
--------------------------------------------------------------------------
recursive read-lock: | ok |
| ok |
recursive read-lock #2: | ok |
| ok |
mixed read-write-lock: | ok |
| ok |
mixed write-read-lock: | ok |
| ok |
--------------------------------------------------------------------------
hard-irqs-on + irq-safe-A/12: ok | ok | ok |
soft-irqs-on + irq-safe-A/12: ok | ok | ok |
hard-irqs-on + irq-safe-A/21: ok | ok | ok |
soft-irqs-on + irq-safe-A/21: ok | ok | ok |
sirq-safe-A => hirqs-on/12: ok | ok | ok |
sirq-safe-A => hirqs-on/21: ok | ok | ok |
hard-safe-A + irqs-on/12: ok | ok | ok |
soft-safe-A + irqs-on/12: ok | ok | ok |
hard-safe-A + irqs-on/21: ok | ok | ok |
soft-safe-A + irqs-on/21: ok | ok | ok |
hard-safe-A + unsafe-B #1/123: ok | ok | ok |
soft-safe-A + unsafe-B #1/123: ok | ok | ok |<7>spurious
8259A interrupt: IRQ7.
hard-safe-A + unsafe-B #1/132: ok | ok | ok |
soft-safe-A + unsafe-B #1/132: ok | ok | ok |
hard-safe-A + unsafe-B #1/213: ok | ok | ok |
soft-safe-A + unsafe-B #1/213: ok | ok | ok |
...
hard-irq read-recursion/321: ok |
soft-irq read-recursion/321: ok |
-------------------------------------------------------
Good, all 218 testcases passed! |
---------------------------------

Please Cc: me in replies.
Thanks.
Martin
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