Re: ext4 iomap SEEK broken [was: [GIT PULL] ext4 updates for 4.15]
From: Theodore Ts'o <tytso@mit.edu>
Date: 2018-02-12 16:10:33
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On Mon, Feb 12, 2018 at 01:14:07PM +0100, Jiri Slaby wrote:
quoted hunk ↗ jump to hunk
On 02/12/2018, 11:02 AM, Jiri Slaby wrote:quoted
Given this happens only on 32bit kernel, I assume some 32bit overflow. But I am unable to see it (yet).Just to add, a diff of strace in good and bad kernels:@@ -655,14 +655,4 @@ _llseek(3, 4275568640, [4286054400], SEEK_DATA) = 0 _llseek(3, 4286054400, [4288675840], SEEK_HOLE) = 0 _llseek(3, 4288675840, [4299161600], SEEK_DATA) = 0 -_llseek(3, 4299161600, [4301783040], SEEK_HOLE) = 0 +_llseek(3, 4299161600, [4299161600], SEEK_HOLE) = 2621440llseek returns a very invalid value when it comes to 0x100400000.
Thanks for the bugreport! Can you send me the output of "filefrag -v" on the file so I can make sure we can exactly replicate what you're seeing? Thanks, - Ted