On Fri, Jul 07, 2017 at 11:17:49PM +0000, Nick Terrell wrote: > On 7/6/17, 9:32 AM, "Adam Borowski" <kilob...@angband.pl> wrote: > > Got a reproducible crash on amd64: > > > > [98235.266511] BUG: unable to handle kernel paging request at > > ffffc90001251000
> > [98235.314008] ? ZSTD_compressBlock_fast+0x94b/0xb30 > > [98235.315975] ? ZSTD_compressContinue_internal+0x1a0/0x580 > > [98235.317938] ? ZSTD_compressStream_generic+0x248/0x2f0 > > [98235.319877] ? ZSTD_compressStream+0x41/0x60 > > [98235.321821] ? zstd_compress_pages+0x236/0x5d0 > > [98235.323724] ? btrfs_compress_pages+0x5e/0x80 > > [98235.325684] ? compress_file_range.constprop.79+0x1eb/0x750 > > Thanks for the bug report Adam! I'm looking into the failure, and haven't > been able to reproduce it yet. I've built my kernel from your tree, and > I ran your script with the kernel.tar tarball 100 times, but haven't gotten > a failure yet. Crashed the same way 4 out of 4 tries for me. > I have a few questions to guide my debugging. > > - How many cores are you running with? I’ve run the script with 1, 2, and 4 > cores. > - Which version of gcc are you using to compile the kernel? I’m using > gcc-6.2.0-5ubuntu12. > - Are the failures always in exactly the same place, and does it fail 100% > of the time or just regularly? 6 cores -- all on bare metal. gcc-7.1.0-9. Lemme try with gcc-6, a different config or in a VM. -- ⢀⣴⠾⠻⢶⣦⠀ ⣾⠁⢠⠒⠀⣿⡁ A dumb species has no way to open a tuna can. ⢿⡄⠘⠷⠚⠋⠀ A smart species invents a can opener. ⠈⠳⣄⠀⠀⠀⠀ A master species delegates.
