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Date: Thu, 21 Apr 2016 12:45:21 +0300 From: Andrey Ryabinin <ryabinin.a.a@...il.com> To: Dmitry Vyukov <dvyukov@...gle.com> Cc: Tejun Heo <tj@...nel.org>, Alexander Viro <viro@...iv.linux.org.uk>, "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, syzkaller <syzkaller@...glegroups.com>, Kostya Serebryany <kcc@...gle.com>, Alexander Potapenko <glider@...gle.com> Subject: Re: fs: GPF in locked_inode_to_wb_and_lock_list 2016-04-21 11:35 GMT+03:00 Dmitry Vyukov <dvyukov@...gle.com>: > > ffffffff818884dd: 48 8b 03 mov (%rbx),%rax > > So whatever load "&wb->bdi->wb" produces is a NULL deref. (is it wb > that is NULL?) Yes it's NULL wb, because there is only one load: mov (%rbx),%rax => rax = wb->bdi add $0x50,%rax => rax = &bdi->wb
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