https://bugzilla.novell.com/show_bug.cgi?id=442316
Summary: Mono GC hangs in 100% CPU loop
Product: Mono: Runtime
Version: 1.9
Platform: x86-64
OS/Version: Linux
Status: NEW
Severity: Normal
Priority: P5 - None
Component: GC
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
QAContact: [email protected]
Found By: Community User
Description of Problem:
The Mono program Beagle shows this problem on my laptop. At some point during
the execution of beagled-helper, it enters a 100% CPU loop and does not exit.
Investigation of the beagled-helper process with kill -QUIT and gdb show that
it is stuck in a tight loop on line 229 of pthread_support.c in the
return_freelists function.
The line is:
for (; (word)q >= HBLKSIZE; qptr = &(obj_link(q)), q = *qptr);
The disassembly of the loop is:
0x00000000004f8470 <return_freelists+32>: mov %rax,%rdx
0x00000000004f8473 <return_freelists+35>: mov (%rax),%rax
0x00000000004f8476 <return_freelists+38>: cmp $0xfff,%rax
0x00000000004f847c <return_freelists+44>: ja 0x4f8470
The value of %rax (which is q I believe) is always 0x24636d8 because the value
of *qptr is also 0x24636d8.
Steps to reproduce the problem:
I am not entirely sure. In my case, I just have to let beagle run indexing on
Evolution email until it happens.
Actual Results:
A tight loop, very high CPU temperature, lots of fan noise.
Expected Results:
Beagle indexing completion without fuss.
How often does this happen?
Every time Beagle launches after user login, eventually after some period of
time.
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