Messages in this thread | | | Date | Fri, 15 Mar 2013 04:26:28 +0000 | From | Al Viro <> | Subject | Re: vfs: lockdep splat with prepare_bprm_creds |
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On Fri, Mar 15, 2013 at 12:07:14AM -0400, Sasha Levin wrote: > Hi all, > > While fuzzing with trinity inside a KVM tools guest running latest -next kernel > I've stumbled on the following. > > Dave Jones reported something similar, but that seemed to involve cgroup's mutex > and didn't seem like it was the same issue as this one.
Lovely... It's an execve() attempt on a "binary" that is, in fact, a procfs file (/proc/<pid>/stack), with its ->read() trying to grab ->cred_guard_mutex. The fact that it's seq_file-based is irrelevant here - all that matters is that we have ->read() for some file trying to grab ->cred_guard_mutex.
It's not *quite* a deadlock, though - all these guys are using mutex_lock_killable()...
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