Date: Sat, 16 Feb 2019 23:20:57 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 235640] panic: mutex pipe mutex not owned at ../../../kern/sys_pipe.c:1748 Message-ID: <bug-235640-227-c8lZo4hDGj@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-235640-227@https.bugs.freebsd.org/bugzilla/> References: <bug-235640-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235640 --- Comment #3 from Mark Johnston <markj@FreeBSD.org> --- This is caused by a race between one end of a pipe being closed and the registration of an EVFILT_WRITE knote for the other end of the pipe. Suppose f_attach (pipe_kqfilter()) succeeds, but before kn_list_lock() is called, the other end of the pipe is closed. pipeclose() removes the EVFILT_WRITE knote from that end's knlist, so kn_list_lock() returns NULL, and we call filt_pipewrite() without the pipe's mutex held. I think this simply means that the assertion in filt_pipewrite() is wrong. We can only assert that the pipe lock is held if wpipe->pipe_present == PIPE_ACTIVE. -- You are receiving this mail because: You are the assignee for the bug.help
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