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Fri, 13 Sep 2024 18:39:34 +0200 Message-ID: <627e37090198cee91bf79c41b1cd8c20c2e2d71f.camel@gmx.de> Subject: Re: [PATCH 10/24] sched/uclamg: Handle delayed dequeue From: Mike Galbraith To: Peter Zijlstra Cc: Luis Machado , Dietmar Eggemann , Vincent Guittot , Hongyan Xia , mingo@redhat.com, juri.lelli@redhat.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, linux-kernel@vger.kernel.org, kprateek.nayak@amd.com, wuyun.abel@bytedance.com, youssefesmat@chromium.org, tglx@linutronix.de Date: Fri, 13 Sep 2024 18:39:30 +0200 In-Reply-To: References: <20240905145354.GP4723@noisy.programming.kicks-ass.net> <20240906104525.GG4928@noisy.programming.kicks-ass.net> <8d0d01b9-a430-49cc-93a5-67b4d68aa35c@arm.com> <20240910140524.GH4723@noisy.programming.kicks-ass.net> <52ca4cea-8f65-434e-af17-e4bf664d9488@arm.com> <20240911084528.GJ4723@noisy.programming.kicks-ass.net> <4fde8f26a9aeaeafda15b81bbb17b0ffc96941f0.camel@gmx.de> <20240911091328.GM4723@noisy.programming.kicks-ass.net> <2030b198180259eede6384cc6a6bc9bc9f64f874.camel@gmx.de> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.42.4 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:2VNJmv6wX65Zijuz77me0RUg49CULHI191g+N4q91XuF0mv1fOe vo+DO+5T/OcKsXpNsYN1TTjp86Ks5ZI7t6jzMrBc9ODJaj9ZqwmLZIp57/zAQgGecfWs9us 86KPjyQyMHI0m0x3mVEksyXmDl9vhJPCEX8Om9NG94Gqw8qkP5ZotuW6ItXSjRpkPR2asK6 TV93k6imaDGf8mwam2NMw== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:mbdwMW34Apg=;MnRCBfnuaxNYZ9g3jvfviRlG4mF LUoLbaunQpT5KdxoGdoGen55Kn1hO0ksIcj+xt0KOIkLcKpbRQqxU4ouYOu+ld5mg270R7q/D 9+2UmSuhOliUAyqI6GJneiB/PtIGRylsGXlT56PIBe26CTtuzM6YnGSuySgmMZ5nAICELPg3T 28AvGbWNohGSVyjPtqnfHp63Qj2/CWhJwvTwWJdV/N32vFOPldDC3ipimte3sxpliMXkxKB5Y Ws1xmNcdwrCeXUZkt8zRiBEVnnCihDjlU8NiE5uqY2Vav5JQu2UPKf/+6eVginXJUcHdi8DYq yrmf+fxwaWaT+uw7p3so1eQvuvOQZSZSNZmR918ciuDEGpZMXcIYCiR8kwdTe/WAEVC2vKAMY v5SIVksC5Q0uUbXwp7Z0JKEMElkC6F4jhW4shpn8eD0RAoFjzlJBA7EKmsLwpKlfhv3E+4oD7 +oh/xqIvsqmQaxH4YSgZ4quEiYXuhSGA/alhZ7S04H5H0WEFR1Ho2InnCJT7Sw5cfT7MG+gQZ +cbjxvCycqJluvR5sazwwG26NKt5uXM1J5Xa0ej0eKZXNXaaguOofWg0WxcCmHw0fKDHpIqwA SCjCrSmRkUNbhaEnxcDjZdJD6oN+NiP07FVhJLCXa4QmTLcwL9Fe+D3159Affky2PIuzCkoJ2 UErRfg5UOPoiqoXXz3PgHqRs0cXydjyXvr49ATx47raJiDAoqWdBV9DHDEwQsuTCoRC5O5DPi 1hRpoHURtCuTAAioe4kIWKAWCbV6n6NYW84Xw12XU0sA7EGbF/9lLXIZ8q1zygezBz2EXXLR5 slO9/K4HSJOXKcwis16MGG/Q== On Thu, 2024-09-12 at 16:00 +0200, Mike Galbraith wrote: > > Oho, I just hit a pick_eevdf() returns NULL in pick_next_entity() and > we deref it bug in tip that I recall having seen someone else mention > them having hit.=C2=A0 LTP was chugging away doing lord knows what when > evolution apparently decided to check accounts, which didn't go well. BTW, what LTP was up to was cfs_bandwidth01. I reproduced the crash using it on master with the full patch set pretty quickly, but rebased tip 4c293d0fa315 (sans sched/eevdf: More PELT vs DELAYED_DEQUEUE) seems to be stable. -Mike