[Bug 8025] Counter-strike freezes at random on ATi video cards

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=8025

Sebastian <indigo176 at blinkenshell.org> changed:

           What    |Removed                     |Added
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                 CC|                            |indigo176 at blinkenshell.org

--- Comment #71 from Sebastian <indigo176 at blinkenshell.org> 2011-02-04 09:12:47 CST ---
It seems like ptrace in wineserver is responsible for this hang. When the hang
occurs, inside suspend_for_ptrace() (server/ptrace.c), it goes something like
this:

#1 ptrace(PTRACE_ATTACH, ...) returns success
#2 wait4() inside of wait4_thread() blocks forever instead of returning on the
stop signal
#3 the watchdog in wait4_thread() times out and wait4_thread() returns failure
#4 because wait4_thread failed, resume_after_ptrace() will be executed
immediately
#5 ptrace(PTRACE_DETACH, ...) inside of resume_after_ptrace() returns ESRCH
(failure)

After this, the thread is still stopped and Counter-Strike hangs. Running
"pkill -CONT hl.exe" resumes the game without a crash.

Also: Trying to attach hl.exe in gdb, during the hang, gives "ptrace: operation
not permitted". After sending CONT to hl.exe, attaching is possible again.


I'd really like to trace this further, but I don't know where to look next. I
have no idea why ptrace/wait hangs like this.

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