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[Bug 773564] Re: compiz occasionally hangs with 100% cpu usage (inotify plugin infinite loop)


I have detected this problem too on Ubuntu 12.04 AMD64.

Here is some information that hopefully someone will find useful.
dpkg-query -S /usr/bin/compiz: compiz-core
dpkg-query -s compiz-core:

Package: compiz-core
Status: install ok installed
Priority: optional
Section: x11
Installed-Size: 1196
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@xxxxxxxxxxxxxxxx>
Architecture: amd64
Source: compiz
Version: 1:


Using "perf top -azG" I see that compiz is stuck at the following loop:
libinotify.so: InotifyScreen::processEvents()
with annoate at:
(%usage/thread) (offset from image base address??) (actual disassembly)
25.00: 54A0:   mov (%rax), rax
00.00: 54A3:   cmp %edx, 0x10(%rax)
75.00: 54A6:   jne 54A0 <InotifyScreen::processEvents()+0xf0>

I caused compiz to core with kill -SIGABRT ..., and incidentaly, the
same bug was triggered when I tried to respond to apport, which then
crashed because of me killing compiz (again) and starting metacity up,
after coping the original compiz crash file for later anaylsis.

Incase you can't get the info from my coredump from different versions
of compiz, here is some info:

gdb /usr/bin/compiz compiz_core (which I had to extract from the
'apport' freindly crash file)

A dissassembly around the looping code:

   0x00007f379d78949c <+236>:	nopl   0x0(%rax)
   0x00007f379d7894a0 <+240>:	mov    (%rax),%rax
   0x00007f379d7894a3 <+243>:	cmp    %edx,0x10(%rax)
=> 0x00007f379d7894a6 <+246>:	jne    0x7f379d7894a0 <_ZN13InotifyScreen13processEventsEv+240>
   0x00007f379d7894a8 <+248>:	mov    0xc(%r14),%eax
   0x00007f379d7894ac <+252>:	mov    0x10(%rdi),%rdx
   0x00007f379d7894b0 <+256>:	lea    0x10(%r14),%rsi

rax            0x1ee1180	32379264
rbx            0x1eec510	32425232
rcx            0x7f37b0e6e9bd	139877167851965
rdx            0x3	3
rsi            0x7fff535766e0	140734591624928
rdi            0x1ec09f0	32246256
rbp            0x80	0x80
rsp            0x7fff535766c0	0x7fff535766c0
r8             0x20	32
r9             0x2920	10528
r10            0x0	0
r11            0x0	0
r12            0x1eec530	32425264
r13            0x0	0
r14            0x7fff535766e0	140734591624928
r15            0x1bdbaa8	29211304
rip            0x7f379d7894a6	0x7f379d7894a6 <InotifyScreen::processEvents()+246>
eflags         0x293	[ CF AF SF IF ]
cs             0x33	51
ss             0x2b	43
ds             0x0	0
es             0x0	0
fs             0x0	0
gs             0x0	0

Hopefuly someone can find this useful.

** Attachment added: "Core dump of compiz at looping code"

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  compiz occasionally hangs with 100% cpu usage (inotify plugin infinite

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