I've got similar behaviour on my 6.99.25 amd64 box - complete freeze during building of Firefox 25 - easily repeatable. The system was stable until 6.99.24, something happened later. Unmodified GENERIC kernel, I couldn't break and get a dump, only hard reset brings it back. I'll try the blind trigger suggestion tomorrow.
On the other hand, my build box (XEN3_DOMU under XenServer) gets updated at the same time as the above box and continues to work as before. Chavdar On 2 November 2013 14:43, Mindaugas Rasiukevicius <[email protected]> wrote: > Thomas Klausner <[email protected]> wrote: >> <...> >> >> Please note that the machine doesn't panic -- otherwise I'd have seen >> reboots instead. >> >> I'm regularly updating, so I think this problem is rather new (last >> month or so). I was usually running with clang; using libc++ is new, >> no idea if this is related or not (I guess not). >> >> Does anyone have any ideas about this? > > Just a few.. > > Can you get into DDB during a lockup (blindly triggering it and typing > call ddb_vgapost)? If you can, inspecting the LWPs (with ps/l) to see > what are they doing would be useful. > > During the glitches, you can try to inspect the LWPs using crash(8). > Also, it would be useful to monitor vmstat -e counters, perhaps some > interrupt rates increase to unusual levels. When glitches start to > happen, you might try to run constant snapshots of lockstat sleep 15, > perhaps some lock contention would indicate what is going on. > >> >> Thanks, >> Thomas > > -- > Mindaugas -- ----
