> > Instead of deferring until memory is available, or even just proceeding > without DMA, the omap_hsmmc driver immediately fails the request with an > error, thus pretty much guaranteeing loss of data or even filesystem > corruption. I personally think this is completely unacceptable behaviour of > a block driver. >
I agree with you 100%. Completely irresponsible and unacceptable. Problem is . . . 'open source', or in this case where the term 'open sores' I think applies. On Tue, Oct 4, 2016 at 12:00 PM, Matthijs van Duin < matthijsvand...@gmail.com> wrote: > I've also run into this once during an apt-get upgrade, leaving the system > in a pretty hosed state. I managed to recover it but it required a lot of > effort. Although evidently rare, this is clearly a very serious issue. > > The direct cause is edma_prep_slave_sg() failing to allocate memory for > the struct edma_desc. I don't know whether the kernel is genuinely out of > memory or if it simply cannot free it up immediately (the allocation is > done with GPF_ATOMIC), and whether this is because it is filled with a > backlog of writes or whether a leak of some sort is going on. > > Instead of deferring until memory is available, or even just proceeding > without DMA, the omap_hsmmc driver immediately fails the request with an > error, thus pretty much guaranteeing loss of data or even filesystem > corruption. I personally think this is completely unacceptable behaviour of > a block driver. > > I've been meaning to persue this matter on the linux-mmc and/or linux-omap > lists, but since it was a single isolated incident and I have lots of other > stuff to do I haven't been able to find the time and motivation yet. > > Matthijs > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to beagleboard+unsubscr...@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/beagleboard/c052b765-78da-4257-857c-09a6046fe395%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/c052b765-78da-4257-857c-09a6046fe395%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORo5pqSW2q_0hSApBMD8WCR69vsHVw5_HEuRbVJ%2Bsg%3Djiw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
