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Message-ID: <20140621055306.GP18016@ZenIV.linux.org.uk> Date: Sat, 21 Jun 2014 06:53:07 +0100 From: Al Viro <viro@...IV.linux.org.uk> To: Theodore Ts'o <tytso@....edu>, Dave Chinner <david@...morbit.com>, Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org Subject: Re: 32-bit bug in iovec iterator changes On Fri, Jun 20, 2014 at 11:51:44PM -0400, Theodore Ts'o wrote: > On Fri, Jun 20, 2014 at 08:38:20AM +1000, Dave Chinner wrote: > > > > Short reads are more likely a bug in all the iovec iterator stuff > > that got merged in from the vfs tree. ISTR a 32 bit-only bug in that > > stuff go past in to do with not being able to partition a 32GB block > > dev on a 32 bit system due to a 32 bit size_t overflow somewhere.... > > Dave Chinner called it. > > Al, I'm seeing a regression which shows up using a 32-bit x86 kernel. > The symptoms of the bug is when run under KVM, with a 5 GB /dev/vdc > virtual block device, a read at offset 2 ** 30 fails with a short > read: > > # dd if=/dev/vdc of=/dev/null bs=4k skip=262144 count=1 > 0+0 records in > 0+0 records out > 0 bytes (0 B) copied, 0.0164144 s, 0.0 kB/s Argh... ed include/linux/uio.h <<EOF /iov_iter_truncate/s/size_t/u64/ w q EOF Could you check if that fixes the sucker? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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