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Fri, 12 Apr 2019 05:55:32 +0000 (UTC) Subject: Re: 5.1.0-rc4: Oops in __rpc_execute() when trying to boot from NFS To: Trond Myklebust , "bfields@fieldses.org" , "linux-nfs@vger.kernel.org" , "jlayton@kernel.org" Cc: "linux-kernel@vger.kernel.org" References: <0412f79c-61a8-bfa4-26ce-1083a59d31e8@zonque.org> <4f4bb4a9-f752-f9f4-41cd-5c41d6191308@zonque.org> <7bdd83d7c2442d8096612ad3f821af556dd96015.camel@hammerspace.com> <78dbd13a-9a91-9a67-eaa6-ea7f0190898b@zonque.org> From: Daniel Mack Openpgp: preference=signencrypt Autocrypt: addr=daniel@zonque.org; prefer-encrypt=mutual; keydata= mQINBFJqOksBEADTAqNa32jIMmtknN+kbl2QCQ+O8onAyfBXW2+ULByC+54ELTsKnuAChxYB pimYqixmqbD9f7PrnU4/zAEMr8yJaTLp1uFHN1Qivx268wVlFBP+rnhULsiwcsJVWWIeeUxR Fk6V7K8RQMGsk0jwTfF+zHfKc7qPIMVh7peZalyIn6giqcQKM6SNrsCjLKlIachR/SstmMOG 5sXkykOh0pqgqj0aDzs2H9UYJyuA1OTkrN8AwA6SgwbZxRThdgbFKY7WaBPALcGK+89OCtwE UV6SIF9cUd0EvaqyawJbjPGRFJ4KckAfZYRdRWtd+2njeC9hehfB/mQVDBzHtquSO6HPKqt/ 4hDtQDXv4qAyBNDi50uXmORKxSJkcFlBGAl0RGOCcegilCfjQHX6XHPXbAfuoJGYyt1i4Iuy Doz5KVxm0SPftRNfg5eVKm3akIEdR1HI315866/QInkinngZ8BItVj+B89pwcbMcaG4cFcB8 4sWOLDPiGob2oaMe88y3whxVW8a+PAyfvesLJFeLGfjtBOO1sGtUa/qudcqS74oyfqVmRz+V sxEQ9xW9MZsZuvZYNT9nHGAP4ekpAs/ZGYX2sraU8394EDhKb2tkQz952D7BH2/xrGleOar2 BnkuCR/M9iS2BPNTYZEYQfIdj7NI3Qbn4vKtM3IMnPWRFS7ZuQARAQABtB9EYW5pZWwgTWFj ayA8ZGFuaWVsQHpvbnF1ZS5vcmc+iQI7BBMBAgAlAhsDBgsJCAcDAgYVCAIJCgsEFgIDAQIe AQIXgAIZAQUCWom+IAAKCRC6YTEa/GNUJDAiD/42ybmeJ4r9yEmdgJraRiDDdcMTPuDwRICQ oxiMBph+eBjdveCaG4K2IjbUouhXKXVAiugSbyHWL9vcBzcPIy+mcxCSf0BC6BCzhR60ontC GTZAGNXVL98RhlnDGtFBPKZfXy1V8LaAe9puyBysv3/RAanc85B6Rv0bMRh/1nKf2rQWHmM5 bnPrxSDh2X3CJEMCCtoTo5jZ3YnkZae7DmVL/0JWGrCPfTXrBsJi+EVNFy2D57DdAWFbcl8C eiQrwBPfVomQTQ0EgLl8gC2V1UxjgdBy3Vpf0MIjlNvE0Lv3MPCwV3X33+07wtpGK7DzJY8N MI+Woe/Qp49QenYL2Xx/R7frfdIG4HAnUaeIGR+1PGqbX9Kc3htKIP9DV3j9xLHkIfhI+2HH HEptLuoewPS2egdtJo4LNWM7WMquJcve/dMae2MWlLfPQiTTy8RUPd8PtTSxrmUAYwGzAPYQ JATxoi/g02BtwsxNxp9gN9tlPEdP+0O2vptN3leADrt6nW495TlbuYwJaz4VPGrkziKpV9HU KgGaRwr0/RpONO4TFk6wTIa2Tak/y8s7rfnr+t7OVp7gG7/CKozRZMv/YijQhelMk4D6E6UI oE5ZQ7bkBRZj0V3fkFl7FM1wzk1WJ2jUhw3wNIy5vQ36rTCoeLDEVpZO1MeVh09FbEDJkBu5 SrkCDQRSajpLARAA4lEVCaGHcCIhxLSxvPjgzj7BzpmPaJbMd92DeKtUcB2vHhhuqa0WQSGO jKlaQdTqowVIQ974snsmNNwF5w8mss46T1X+2WS7YKAyn4dDScukY54thYthOkOn4DbKV6S0 4IV30DL9/5iQHszl9FNY7MIdvwMM7ozxJYrUv+wKcfOBh4zbFisXCu+jPobyKe+5XurJXXZ9 2aSDkrKPT9zKSUz+fElb/mL7o4NCeQcK5yvKMgj1MqT7O+V5F3gM/bh0srNMxL8w27pgYm6e O99M3vNkRd+qyXOsc6dLqgSkxsoRuWVX8vJROi6gMdn7O/AZ85t5paFIj5rqRJyYTPDRKN2Z ayT+ZPlF14b6LaodbPbZXEwiPfGhUwuVSwUjKHjcJMLLi5vq62fq1X/cCi2midjFY6nQsSn9 Mldx6v7JJWW8hvlnw+smduhg0UCfwx0KCI9wSPE2MUbm6KKS4DwAPbi0WCeUcNzRUxTCAs6c a9EOH0qsEAH7vwLzCf5lFiTMolhDJLZrsYvS1MBN4FxsyC7MMW2j4rMk2v0STORRGNY5oxrn LAO52ns135O2A22Mnhqo+ssjhJQAvEr5f13/qUEP0w79Qg9BUE5yfwJsalhgVfEvKabrNDKu a7UqNZ5lJZO2TdCi7OYl34WEnS3e+3qY2oHSL5n4kLiT/v+/1U0AEQEAAYkCHwQYAQIACQIb DAUCV6sTCAAKCRC6YTEa/GNUJHw5D/4luZ1GFCPW8kqkmpBUFTVjZqOhhT+z0KnrBsisJSOH VR8MraCDWHo/u4PTgqwF38PvyeZ4jXTXv+5FYjN6sJ8ydnfsUOORoM/KUafXmAug3zafqFd9 CzELh8FutTRYncoJMmL2HAbHqQRZlcFj6mKYFKqN+pA3tPbl3QpDORxMzeSn0J4sQeaVkIw2 inqYKTW+7vMi9/toMBNPEJPgSG77opYcEVjtDCPeAermjt6Ypqb0NyvE7zHLXpw3zcIA+Zge 0VIIW5bXco8520SJfDCKlS3IJlxOGgLVbcWwMayhO8cw8kWHg4KqjWQPvfsuhALGUidfhC3h L/o+2sOPZXT09OIR4arkuWH7xPF2X+L13TJ52OqVt0ERX5D9/7AwTArpCK6Vr3hybscBwFdW DduIc9DAFQ4AzQuURhAP2wHBmayrVDdtwtZVxyO6b6G2brkdbCpFEzeg66Q1jp/R5GXgNMBi qkqS7nnXncMTx6jmMAxHQ3XoXzPIZmBvWmD9Z0gCyTU6lSFSiGLO7KegnaRgBlJX/kmZ7Xfu YbiKOFbQ6XDctinOnZW5HFQiNQ+qkkx/CEcC1tXPY+JMjmA43KfCtwCjZbmi/bmb1JHJNZ9O H/iGc7WLxMDmqqBiZcQMQ0fcvv9Pj/NM8qNTDPtWeMwHV1p5s/U9nT8E35Hvbwx1Zg== Message-ID: Date: Fri, 12 Apr 2019 07:57:11 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Trond, On 11/4/2019 9:50 PM, Trond Myklebust wrote: > On Tue, 2019-04-09 at 19:54 +0200, Daniel Mack wrote: >> On 9/4/2019 6:55 PM, Trond Myklebust wrote: >>> On Tue, 2019-04-09 at 18:25 +0200, Daniel Mack wrote: >>>> On 8/4/2019 8:51 PM, Trond Myklebust wrote: >>>>> On Mon, 2019-04-08 at 19:01 +0200, Daniel Mack wrote: >>>>>> Hi, >>>>>> >>>>>> I'm seeing the Oops below when trying to boot 5.1.0-rc4 on an >>>>>> ARM >>>>>> PXA3xx >>>>>> platform. v5.0 did not show this effect with the same >>>>>> cmdline. >>>>>> >>>>> Please do bisect if that is at all practical. I'm having >>>>> trouble >>>>> interpreting this Oops. >>>> >>>> Here you go: >>>> >>>> 009a82f6437490c262584d65a14094a818bcb747 is the first bad commit >>>> commit 009a82f6437490c262584d65a14094a818bcb747 >>>> Author: Trond Myklebust >>>> Date: Sat Mar 9 12:07:17 2019 -0500 >>>> >>>> SUNRPC: Micro-optimise when the task is known not to be >>>> sleeping >>>> >>>> In cases where we know the task is not sleeping, try to >>>> optimise >>>> away the indirect call to task->tk_action() by replacing it >>>> with >>>> a direct call. >>>> Only change tail calls, to allow gcc to perform tail call >>>> elimination. >>> >>> Ah... It looks like we explicitly turn off tail call optimisation >>> in >>> some ARM configs, so this might be a stack overflow. >>> >>> Does your config file have THUMB2_AVOID_R_ARM_THM_JUMP11 set? >> >> Nope. I don't even have THUMB2_KERNEL. >> >> In the meantime, I tried to trace that with some printks, but the bug >> appears evasive, and the backtrace changes as soon as I modify the >> timing. Hmm. >> >> Happy to test patches if you have any idea. >> > > Could you please try pulling the 'testing' branch from > http://git.linux-nfs.org/?p=trondmy/linux-nfs.git;a=shortlog;h=refs/heads/testing > > i.e. 'git pull git://git.linux-nfs.org/projects/trondmy/linux-nfs.git > testing' > > to see if that suffices to fix the issue you're reporting? Yes, that revert in your branch fixes the problem. All fine again! Thanks, Daniel