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Wed, 15 Feb 2023 18:50:36 -0800 (PST) Received: from [192.168.1.136] ([198.8.77.157]) by smtp.gmail.com with ESMTPSA id t7-20020a1709027fc700b0019a74841c9bsm46385plb.192.2023.02.15.18.50.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Feb 2023 18:50:35 -0800 (PST) Message-ID: <3a7e342c-844e-8071-7dde-86b88bbb2dc4@kernel.dk> Date: Wed, 15 Feb 2023 19:50:34 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux aarch64; rv:102.0) Gecko/20100101 Thunderbird/102.7.2 Subject: Re: io_uring failure on parisc with VIPT caches Content-Language: en-US To: John David Anglin , Helge Deller , io-uring@vger.kernel.org, linux-parisc@vger.kernel.org, James Bottomley References: <006e8db4-336f-6717-ecb0-d01a0e9bc483@kernel.dk> <626cee6f-f542-b7eb-16ca-1cf4e3808ca6@bell.net> <5f02fa8b-7fd8-d98f-4876-f1a89024b888@kernel.dk> <2b89f252-c430-1c44-7b30-02d927d2c7cb@gmx.de> <0bfe6cdb-2749-c08d-a1b2-ef46fed1ded3@bell.net> <07810314-94f6-0e9a-984b-0a286cbb59d3@kernel.dk> <4f4f9048-b382-fa0e-8b51-5a0f0bb08402@kernel.dk> <99a41070-f334-f3cb-47cd-8855c938d71f@bell.net> <5e72c1fc-1a7b-a4ed-4097-96816b802e6d@bell.net> <73566dc4-317b-5808-a5a5-78dc195ebd77@kernel.dk> <1237dc53-2495-a145-37bf-47366ca75e71@bell.net> From: Jens Axboe In-Reply-To: <1237dc53-2495-a145-37bf-47366ca75e71@bell.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On 2/15/23 7:40 PM, John David Anglin wrote: > On 2023-02-15 6:02 p.m., Jens Axboe wrote: >> This is not related to Helge's patch, 6.1-stable is just still missing: >> >> commit fcc926bb857949dbfa51a7d95f3f5ebc657f198c >> Author: Jens Axboe >> Date:   Fri Jan 27 09:28:13 2023 -0700 >> >>      io_uring: add a conditional reschedule to the IOPOLL cancelation loop >> >> and I'm guessing you're running without preempt. > With 6.2.0-rc8+, I had a different crash running poll-race-mshot.t: > > Backtrace: > > > Kernel Fault: Code=15 (Data TLB miss fault) at addr 0000000000000000 > CPU: 0 PID: 18265 Comm: poll-race-mshot Not tainted 6.2.0-rc8+ #1 > Hardware name: 9000/800/rp3440 > >      YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI > PSW: 00010000001001001001000111110000 Not tainted > r00-03  00000000102491f0 ffffffffffffffff 000000004020307c ffffffffffffffff > r04-07  ffffffffffffffff ffffffffffffffff ffffffffffffffff ffffffffffffffff > r08-11  ffffffffffffffff 000000000407ef28 000000000407f838 8400000000800000 > r12-15  0000000000000000 0000000040c424e0 0000000040c424e0 0000000040c424e0 > r16-19  000000000407fd68 0000000063f08648 0000000040c424e0 000000000a085000 > r20-23  00000000000d6b44 000000002faf0800 00000000000000ff 0000000000000002 > r24-27  000000000407fa30 000000000407fd68 0000000000000000 0000000040c1e4e0 > r28-31  400000000000de84 0000000000000000 0000000000000000 0000000000000002 > sr00-03  0000000004081000 0000000000000000 0000000000000000 0000000004081de0 > sr04-07  0000000004081000 0000000000000000 0000000000000000 00000000040815a8 > > IASQ: 0000000004081000 0000000000000000 IAOQ: 0000000000000000 0000000004081590 >  IIR: 00000000    ISR: 0000000000000000  IOR: 0000000000000000 >  CPU:        0   CR30: 000000004daf5700 CR31: ffffffffffffefff >  ORIG_R28: 0000000000000000 >  IAOQ[0]: 0x0 >  IAOQ[1]: linear_quiesce+0x0/0x18 [linear] >  RP(r2): intr_check_sig+0x0/0x3c > Backtrace: > > Kernel panic - not syncing: Kernel Fault This means very little to me, is it a NULL pointer deref? And where's the backtrace? -- Jens Axboe