On 10/19/2013 08:27 PM, Helge Deller wrote: > On 10/18/2013 10:12 PM, Myklebust, Trond wrote: >> On Fri, 2013-10-18 at 22:03 m, Helge Deller wrote: >>> On 10/18/2013 09:36 PM, Myklebust, Trond wrote: >>>> Also, could you please try a sysRQ-t the next time it happens, so that >>>> we can get a trace of where the mount program is hanging. Knowing that >>>> the mount is stuck in "__schedule()" is not really interesting unless we >>>> know from where that was called. >>> >>> Actually, the machine was still running in this state. >>> Here is sysrq-t: >>> [112009.084000] mount S 00000000401040c0 0 25331 1 0x00000010 >>> [112009.084000] Backtrace: >>> [112009.084000] [<0000000040113a68>] __schedule >>> [112009.232000] >>> [112009.232000] mount.nfs D 00000000401040c0 0 25332 25331 0x00000010 >>> [112009.232000] Backtrace: >>> [112009.232000] [<0000000040113a68>] __schedule >> >> That makes no sense unless sysrq-t works differently on parisc than on >> other platforms. I'd expect the backtrace to at least include a system >> call. Parisc experts? > > sysrq-t doesn't work differently on parisc. For other processes I do get > a backtrace like the one on x86_64. > That's the main reason why I asked for ideas here on the list. > I do see the stuck process, but don't see any indications where it comes from. I'm pretty sure that the regression (kswapd using 100% CPU) I reported here is fixed by this patch: http://git.kernel.org/cgit/linux/kernel/git/deller/parisc-linux.git/commit/?id=c56b097af26cb11c1f49a4311ba538c825666fed I will start some testing... Helge -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
