I have problems debugging system hangs (bug #15737 - https://bugzilla.kernel.org/show_bug.cgi?id=15737) which occur on kernels >=2.6.33 (LTS i.e. 2.6.32 is not affected). I cannot manage to debug them especially it actual results evolve along with changes in userspace (however 2.6.32 is not affected). On various stages: - Second start of composite WM would be either hard hang or will fix the system (i.e. problem will not be reproduced until next reboot - and will not be reproduced after hibernation) - recently (for 2 weeks) false - First start of X will result in soft hang only - true except some builds of 2.6.35 with relocatable kernel (???) and very old builds (2.6.33) - Magic SysRQ key does not work on hard hang - If second start of WM was successful the DRI after some time will report bad drawables. It is fixed by reboot - recent (for 2 weeks) - Switching to console and back helps (i.e. more often there is no hang) - possibly voodoo magic but it may help - Error messages about failing to pinpoint buffor (cause? side-effect?) - Running X in gdb hangs system (even if it is not on current VT) Soft hang: X hangs but I can switch to console. Turning off X will stop it but it takes some time (a minute?). There is nothing in logs (X, dmesg, system...) Hard hang: System is not responsive including network, X, sysrq etc. This is not kernel panic (caps lock and num lock does not blink). Someone (probably not kernel dev) suggested that it might be connected with removing BKL. I am really sorry for spamming but I run out of ideas how to debug this problem. Regards
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