Date: Fri, 24 Jul 2020 17:18:03 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 248245] arm64 kernel panic under heavy UFS writes (getblk -> ffs_balloc_ufs2) Message-ID: <bug-248245-227-jAMF8O896z@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-248245-227@https.bugs.freebsd.org/bugzilla/> References: <bug-248245-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D248245 Mark Johnston <markj@FreeBSD.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |mjg@FreeBSD.org --- Comment #7 from Mark Johnston <markj@FreeBSD.org> --- I think the problem is in r363415. It converted some lockmgr code to use atomic_fcmpset instead of atomic_cmpset. The former can fail spuriously on LL/SC platforms, so a tryxlock operation can fail even when the buf is unlocked. lockmgr should take care to retry if fcmpset fails but returns t= he "expected" value. --=20 You are receiving this mail because: You are the assignee for the bug.=
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