app_server: crash in ServerInfo::GetInfo when opening and closing window

[X512]

This is hrev54968.

Steps to reproduce:

1. g++ MinApp.cpp -lbe -o MinApp
2. Run MinApp.
3. Run some application (StyledEdit for example).
4. app_server will crash.

[X512]

app_server stack trace

[X512]

I get this crash when attempting to close window without any stress tests or another unusual things.

[X512]

Still can reproduce with hrev56688.

[waddlesplash]

Doesn't reproduce for me, on hrev56792. I let the application run for a while and started and stopped StyledEdit and others while it was running. No crash.

[X512]

Seems to be some race condition so it may be timing dependent. Also using SMP may help reproducing.

[waddlesplash]

The VM I tested in had 2 cores allotted.

[humdinger]

Reproducible on metal, i7 8 cores.

[bipolar]

I hit this app_server crash today on hrev58228, 64 bits. With only a couple of Tracker windows open. Moved a folder around, closed a window. Puff.

On a slow Atom N2600 (2C/4T) netbook, using framebuffer, if that changes anything.

KERN: vm_page_fault: vm_soft_fault returned error 'Bad address' on fault at 0x58c, ip 0x17caeecb357, write 0, user 1, exec 0, thread 0xc0
KERN: debug_server: Thread 192 entered the debugger: Segment violation
KERN: stack trace, current PC 0x17caeecb357  </boot/system/servers/app_server> _ZN12ServerWindow7GetInfoER11window_info + 0x37:
KERN:   (0x7fe3a2b2d5c0)  0x17caeea284d  </boot/system/servers/app_server> _ZN7Desktop15WriteWindowInfoEiRN8BPrivate10LinkSenderE + 0x9d
KERN:   (0x7fe3a2b2d710)  0x17caeebaec3  </boot/system/servers/app_server> _ZN9ServerApp16_DispatchMessageEiRN8BPrivate12LinkReceiverE + 0x2ef3
KERN:   (0x7fe3a2b2e230)  0x17caeeb7edc  </boot/system/servers/app_server> _ZN9ServerApp14_MessageLooperEv + 0xfc
KERN:   (0x7fe3a2b2e300)  0x17caeeb155a  </boot/system/servers/app_server> _ZN13MessageLooper15_message_threadEPv + 0xa
KERN:   (0x7fe3a2b2e310)  0x145e2ca9f29  </boot/system/lib/libroot.so> thread_entry + 0x19