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Date: Wed, 15 Mar 2023 13:27:11 +0200 From: Ivan Zahariev <famzah@...soft.com> To: Jan Kara <jack@...e.cz>, Theodore Ts'o <tytso@....edu> Cc: linux-ext4@...r.kernel.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: Re: kernel BUG at fs/ext4/inode.c:1914 - page_buffers() On 12.1.2023 г. 17:07, Jan Kara wrote: > So after a bit of thought I agree that the commit 5c48a7df91499 ("ext4: fix > an use-after-free issue about data=journal writeback mode") is broken. The > problem is when we unlock the page in __ext4_journalled_writepage() anybody > else can come, writeout the page, and reclaim page buffers (due to memory > pressure). Previously, bh references were preventing the buffer reclaim to > happen but now there's nothing to prevent it. > > My rewrite of data=journal writeback path fixes this problem as a > side-effect but perhaps we need a quickfix for stable kernels? Something > like attached patch? > > Honza Do you consider this patch production ready? Should we test it on real production machines with a peace of mind that nothing can go wrong in regards to data loss or corruption? --Ivan
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