On Sun, May 18 2008, Jens Axboe wrote: > On Sat, May 17 2008, M. Edward (Ed) Borasky wrote: > > Environment: Gentoo Linux 2.6.25 kernel, AMD Athlon64 X2 dual core, 4 GB > > of RAM, single disk drive sda, reiserfs filesystems. > > > > I started up blktrace with "blktrace -d /dev/sda". Version is > > $ blktrace -V > > blktrace version 0.99.3 > > > > Then I recompiled php to generate some I/O. Then I stopped blktrace and > > ran blkparse. Version is > > $ blkparse -V > > blkparse version 0.99.3 > > > > Both "blkparse sda" and "blkparse -t sda" run fine, but "blkparse -s > > sda" segfaults: > > > > $ blkparse -s sda > blkparse.out > > Segmentation fault > > > > It generates partial output before crashing. > > > > I'm planning to try this again under gdb to get a traceback. The Gentoo > > "btrace" package is sys-block/btrace-0.0.20071210202527 -- if this is > > too old, let me know and I'll install something more recent from the > > repositories. > > Could you send me the blktrace output files so that I can reproduce? > You could try self-compiling > > http://brick.kernel.dk/snaps/blktrace-git-latest.tar.gz > > just to see if it reproduces in current HEAD. This turned out to be missing notify events, for some (as of yet) undiagnosed reason. I committed a fix to handle those, it's not unlikely that we COULD miss a notify event and we should cope with that anyway. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-btrace" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
