On Sat, 2013-01-19 at 04:49 +0000, Eric Wong wrote: > With the following flow, I'm sometimes getting an unexpected EOF on the > pipe reader even though I never close the pipe writer: > > tcp_wr -write-> tcp_rd -splice-> pipe_wr -> pipe_rd -splice-> /dev/null > > I encounter this in in 3.7.3, 3.8-rc3, and the latest from Linus > 3.8-rc4+(5da1f88b8b727dc3a66c52d4513e871be6d43d19) > > It takes longer (about 20s) to reproduce this issue on my KVM (2 cores) > running the latest Linus kernel, so maybe real/faster hardware is needed. > My dual-core laptop (on 3.7.3) which hosts the VM does encounter this > issue within a few seconds (or even <1s). > > Using schedtool to pin to a single core (any CPU core) on real hardware > seems to avoid this issue on real hardware. Not sure how KVM uses CPUs, > but schedtool doesn't help inside my VM (not even schedtool on the KVM > process). > > Example code below (and via: git clone git://bogomips.org/spliceeof ) > > Expected outout from ./spliceeof: > done writing > splice(in) EOF (expected) > > Output I get from ./spliceeof: > splice(out) EOF (UNEXPECTED) > in left: 47716 # the byte value varies > > I've successfully run similar code within the past year on some 3.x > kernels, so I think this issue is fairly recent (Cc-ing folks who > have touched splice lately). > > Any likely candidates before I start bisection? Thanks for reading. > > -------------------------------- 8< ------------------------------
Hmm, this might be already fixed in net-next tree, could you try it ? Thanks ! -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
