Revision bb143f814ea488769ca2e79e0b376139cb5f134b authored by Vineet Gupta on 23 February 2016, 06:25:16 UTC, committed by Vineet Gupta on 24 February 2016, 05:37:28 UTC
ARConnect/MCIP Inter-Core-Interrupt module can't send interrupt to local core. So use core intc capability to trigger software interrupt to self, using an unsued IRQ #21. This showed up as csd deadlock with LTP trace_sched on a dual core system. This test acts as scheduler fuzzer, triggering all sorts of schedulting activity. Trouble starts with IPI to self, which doesn't get delivered (effectively lost due to H/w capability), but the msg intended to be sent remain enqueued in per-cpu @ipi_data. All subsequent IPIs to this core from other cores get elided due to the IPI coalescing optimization in ipi_send_msg_one() where a pending msg implies an IPI already sent and assumes other core is yet to ack it. After the elided IPI, other core simply goes into csd_lock_wait() but never comes out as this core never sees the interrupt. Fixes STAR 9001008624 Cc: Peter Zijlstra <peterz@infradead.org> Cc: <stable@vger.kernel.org> [4.2] Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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File | Mode | Size |
---|---|---|
Kconfig | -rw-r--r-- | 827 bytes |
Makefile | -rw-r--r-- | 416 bytes |
afs.h | -rw-r--r-- | 5.7 KB |
afs_cm.h | -rw-r--r-- | 1.2 KB |
afs_fs.h | -rw-r--r-- | 2.3 KB |
afs_vl.h | -rw-r--r-- | 3.6 KB |
cache.c | -rw-r--r-- | 10.8 KB |
callback.c | -rw-r--r-- | 11.3 KB |
cell.c | -rw-r--r-- | 10.3 KB |
cmservice.c | -rw-r--r-- | 13.9 KB |
dir.c | -rw-r--r-- | 25.8 KB |
file.c | -rw-r--r-- | 8.6 KB |
flock.c | -rw-r--r-- | 15.7 KB |
fsclient.c | -rw-r--r-- | 44.4 KB |
inode.c | -rw-r--r-- | 12.3 KB |
internal.h | -rw-r--r-- | 31.1 KB |
main.c | -rw-r--r-- | 4.4 KB |
misc.c | -rw-r--r-- | 2.8 KB |
mntpt.c | -rw-r--r-- | 6.3 KB |
netdevices.c | -rw-r--r-- | 1.5 KB |
proc.c | -rw-r--r-- | 14.9 KB |
rxrpc.c | -rw-r--r-- | 20.1 KB |
security.c | -rw-r--r-- | 8.9 KB |
server.c | -rw-r--r-- | 7.7 KB |
super.c | -rw-r--r-- | 12.5 KB |
vlclient.c | -rw-r--r-- | 5.4 KB |
vlocation.c | -rw-r--r-- | 17.4 KB |
vnode.c | -rw-r--r-- | 24.1 KB |
volume.c | -rw-r--r-- | 9.9 KB |
write.c | -rw-r--r-- | 17.9 KB |
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