Date: Fri, 1 Sep 2006 16:28:10 GMT From: Robert Watson <rwatson@FreeBSD.org> To: rwatson@FreeBSD.org, freebsd-bugs@FreeBSD.org, rwatson@FreeBSD.org Subject: Re: kern/102752: malloc(M_WAITOK) of "g_bio", forcing M_NOWAIT with non-sleepable locks held Message-ID: <200609011628.k81GSAsa029980@freefall.freebsd.org>
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Synopsis: malloc(M_WAITOK) of "g_bio", forcing M_NOWAIT with non-sleepable locks held Responsible-Changed-From-To: freebsd-bugs->rwatson Responsible-Changed-By: rwatson Responsible-Changed-When: Fri Sep 1 16:26:32 UTC 2006 Responsible-Changed-Why: Grab ownership of this PR, since it is of interest to me. The fix here is to drop the inpcb lock before going near copyin/copyout, but the tricky bit is that the connection may change state while the lock is dropped, so the path from the socket to the inpcb/tcpcb must be re-evaluated, and the timewait state checked for. In HEAD this is easier since the inpcb can't go away, but in -STABLE we need to check that so_pcb is still non-NULL also, as the connection could have been reset. I'll work on a patch for this in the near future. http://www.freebsd.org/cgi/query-pr.cgi?pr=102752
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