From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7A119C43613 for ; Sat, 22 Jun 2019 12:40:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 39056206B7 for ; Sat, 22 Jun 2019 12:40:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726286AbfFVMkc (ORCPT ); Sat, 22 Jun 2019 08:40:32 -0400 Received: from mx2.mailbox.org ([80.241.60.215]:62004 "EHLO mx2.mailbox.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726112AbfFVMkc (ORCPT ); Sat, 22 Jun 2019 08:40:32 -0400 Received: from smtp2.mailbox.org (smtp2.mailbox.org [80.241.60.241]) (using TLSv1.2 with cipher ECDHE-RSA-CHACHA20-POLY1305 (256/256 bits)) (No client certificate requested) by mx2.mailbox.org (Postfix) with ESMTPS id 3A44AA1335 for ; Sat, 22 Jun 2019 14:40:29 +0200 (CEST) X-Virus-Scanned: amavisd-new at heinlein-support.de Received: from smtp2.mailbox.org ([80.241.60.241]) by spamfilter04.heinlein-hosting.de (spamfilter04.heinlein-hosting.de [80.241.56.122]) (amavisd-new, port 10030) with ESMTP id YB7LCOt0SSsX for ; Sat, 22 Jun 2019 14:40:27 +0200 (CEST) From: Hauke Mehrtens Subject: Call trace stops at static callback functions Openpgp: preference=signencrypt Autocrypt: addr=hauke@hauke-m.de; keydata= mQINBFtLdKcBEADFOTNUys8TnhpEdE5e1wO1vC+a62dPtuZgxYG83+9iVpsAyaSrCGGz5tmu BgkEMZVK9YogfMyVHFEcy0RqfO7gIYBYvFp0z32btJhjkjBm9hZ6eonjFnG9XmqDKg/aZI+u d9KGUh0DeaHT9FY96qdUsxIsdCodowf1eTNTJn+hdCudjLWjDf9FlBV0XKTN+ETY3pbPL2yi h8Uem7tC3pmU7oN7Z0OpKev5E2hLhhx+Lpcro4ikeclxdAg7g3XZWQLqfvKsjiOJsCWNXpy7 hhru9PQE8oNFgSNzzx2tMouhmXIlzEX4xFnJghprn+8EA/sCaczhdna+LVjICHxTO36ytOv7 L3q6xDxIkdF6vyeEtVm1OfRzfGSgKdrvxc+FRJjp3TIRPFqvYUADDPh5Az7xa1LRy3YcvKYx psDDKpJ8nCxNaYs6hqTbz4loHpv1hQLrPXFVpoFUApfvH/q7bb+eXVjRW1m2Ahvp7QipLEAK GbiV7uvALuIjnlVtfBZSxI+Xg7SBETxgK1YHxV7PhlzMdTIKY9GL0Rtl6CMir/zMFJkxTMeO 1P8wzt+WOvpxF9TixOhUtmfv0X7ay93HWOdddAzov7eCKp4Ju1ZQj8QqROqsc/Ba87OH8cnG /QX9pHXpO9efHcZYIIwx1nquXnXyjJ/sMdS7jGiEOfGlp6N9IwARAQABtCFIYXVrZSBNZWhy dGVucyA8aGF1a2VAaGF1a2UtbS5kZT6JAlQEEwEIAD4CGwEFCwkIBwIGFQgJCgsCBBYCAwEC HgECF4AWIQS4+/Pwq1ZO6E9/sdOT3SBjCRC1FQUCXQTYzQUJA5qXpgAKCRCT3SBjCRC1FT6c D/9gD0CtAPElKwhNGzZ/KNQL39+Q4GOXDAOxyP797gegyykvaqU/p0MOKdx8F2DHJCGlrkBW qiEtYUARnUJOgftoTLalidwEp6eiZM9Eqin5rRR6B5NIYUIjHApxjPHSmfws5pnaBdI6NV8t 5RpOTANIlBfP6bTBEpVGbC0BwvBFadGovcKLrnANZ4vL56zg0ykRogtD8reoNvJrNDK7XCrC 2S0EYcGD5cXueJbpf6JRcusInYjMm/g2sRCH4cQs/VOjj3C66sNEMvvZdKExZgh/9l9RmW0X 6y7A0SDtR3APYWGIwV0bhTS2usuOAAZQvFhc+idSG0YrHqRiOTnWxOnXkFFaOdmfk99eWaqp XOIgxHr6WpVromVI+wKWVNEXumLdbEAvy1vxCtpaGQpun5mRces5GB2lkZzRjm90uS9PgWB1 IYj1ehReuj0jmkpan0XdEhwFjQ3+KfyzX7Ygt0gbzviGbtSB2s1Mh0nAdto9RdIYi3gCLQh3 abtwk6zqsHRBp1IHjyNq60nsUSte4o1+mRBoB6I7uTkxqJPmynwpmAoaYkN2MRO8C1O09Yd4 H3AgFGZBXpoVbph8Q7hE33Y9UrElfiDsvdj4+JVu1sdPPGFWtpjpe5LeoXzLANAbJ2T+Y68U gtsNFCbSKjXsRJlLIHR1yHQbq2VdUDmsUZaRbLkBDQRbS3sDAQgA4DtYzB73BUYxMaU2gbFT rPwXuDba+NgLpaF80PPXJXacdYoKklVyD23vTk5vw1AvMYe32Y16qgLkmr8+bS9KlLmpgNn5 rMWzOqKr/N+m2DG7emWAg3kVjRRkJENs1aQZoUIFJFBxlVZ2OuUSYHvWujej11CLFkxQo9Ef a35QAEeizEGtjhjEd4OUT5iPuxxr5yQ/7IB98oTT17UBs62bDIyiG8Dhus+tG8JZAvPvh9pM MAgcWf+Bsu4A00r+Xyojq06pnBMa748elV1Bo48Bg0pEVncFyQ9YSEiLtdgwnq6W8E00kATG VpN1fafvxGRLVPfQbfrKTiTkC210L7nv2wARAQABiQI8BBgBCAAmAhsMFiEEuPvz8KtWTuhP f7HTk90gYwkQtRUFAl0E2QUFCQOakYIACgkQk90gYwkQtRUEfQ//SxFjktcASBIl8TZO9a5C cCKtwO3EvyS667D6S1bg3dFonqILXoMGJLM0z4kQa6VsVhtw2JGOIwbMnDeHtxuxLkxYvcPP 6+GwQMkQmOsU0g8iT7EldKvjlW2ESaIVQFKAmXS8re36eQqj73Ap5lzbsZ6thw1gK9ZcMr1F t1Eigw02ckkY+BFetR5XGO4GaSBhRBYY7y4Xy0WuZCenY7Ev58tZr72DZJVd1Gi4YjavmCUH BaTv9lLPBS84C3fObxy5OvNFmKRg1NARMLqjoQeqLBwBFOUPcL9xr0//Yv5+p1SLDoEyVBhS 0M9KSM0n9RcOiCeHVwadsmfo8sFXnfDy6tWSpGi0rUPzh9xSh5bU7htRKsGNCv1N4mUmpKro PLKjUsfHqytT4VGwdTDFS5E+2/ls2xi4Nj23MRh6vvocIxotJ6uNHX1kYu+1iOvsIjty700P 3IveQoXxjQ0dfvq3Ud/Sl/5bUelft21g4Qwqp+cJGy34fSWD4PzOCEe6UgmZeKzd/w78+tWP vzrTXNLatbb2OpYV8gpoaeNcLlO2DHg3tRbe/3nHoU8//OciZ0Aqjs97Wq0ZaC6Cdq82QNw1 dZixSEWAcwBw0ej3Ujdh7TUAl6tx5AcVxEAmzkgDEuoJBI4vyA1eSgMwdqpdFJW2V9Lbgjg5 2H6vOq/ZDai29hi5AQ0EW0t7cQEIAOZqnCTnoFeTFoJU2mHdEMAhsfh7X4wTPFRy48O70y4P FDgingwETq8njvABMDGjN++00F8cZ45HNNB5eUKDcW9bBmxrtCK+F0yPu5fy+0M4Ntow3PyH MNItOWIKd//EazOKiuHarhc6f1OgErMShe/9rTmlToqxwVmfnHi1aK6wvVbTiNgGyt+2FgA6 BQIoChkPGNQ6pgV5QlCEWvxbeyiobOSAx1dirsfogJwcTvsCU/QaTufAI9QO8dne6SKsp5z5 8yigWPwDnOF/LvQ26eDrYHjnk7kVuBVIWjKlpiAQ00hfLU7vwQH0oncfB5HT/fL1b2461hmw XxeV+jEzQkkAEQEAAYkDcgQYAQgAJgIbAhYhBLj78/CrVk7oT3+x05PdIGMJELUVBQJdBNkF BQkDmpEUAUDAdCAEGQEIAB0WIQTLPT+4Bx34nBebC0Pxt2eFnLLrxwUCW0t7cQAKCRDxt2eF nLLrx3VaB/wNpvH28qjW6xuAMeXgtnOsmF9GbYjf4nkVNugsmwV7yOlE1x/p4YmkYt5bez/C pZ3xxiwu1vMlrXOejPcTA+EdogebBfDhOBib41W7YKb12DZos1CPyFo184+Egaqvm6e+GeXC tsb5iOXR6vawB0HnNeUjHyEiMeh8wkihbjIHv1Ph5mx4XKvAD454jqklOBDV1peU6mHbpka6 UzL76m+Ig/8Bvns8nzX8NNI9ZeqYR7vactbmNYpd4dtMxof0pU13EkIiXxlmCrjM3aayemWI n4Sg1WAY6AqJFyR4aWRa1x7NDQivnIFoAGRVVkJLJ1h8RNIntOsXBjXBDDIIVwvvCRCT3SBj CRC1FZFcD/9fJY57XXQBDU9IoqTxXvr6T0XjPg7anYNTCyw3aXCW/MrHAV2/MAK9W2xbXWmM yvhidzdGHg80V3eJuc4XvQtrvK3HjDxh7ZpF9jUVQ39jKNYRg2lHg61gxYN3xc/J73Dw8kun esvZS2fHHzG1Hrj2oWv3xUbh+vvR1Kyapd5he8R07r3vmG7iCQojNYBrfVD3ZgenEmbGs9fM 1h+n1O+YhWOgxPXWyfIMIf7WTOeY0in4CDq2ygJfWaSn6Fgd4F/UVZjRGX0JTR/TwE5S2yyr 1Q/8vUqUO8whgCdummpC85ITZvgI8IOWMykP+HZSoqUKybsFlrX7q93ykkWNZKck7U7GFe/x CiaxvxyPg7vAuMLDOykqNZ1wJYzoQka1kJi6RmBFpDQUg7+/PS6lCFoEppWp7eUSSNPm8VFb jwa1D3MgS3+VSKOMmFWGRCY99bWnl2Zd2jfdETmBFNXA94mg2N2vI/THju79u1dR9gzpjH7R 3jmPvpEc2WCU5uJfaVoAEqh9kI2D7NlQCG80UkXDHGmcoHBnsiEZGjzm5zYOYinjTUeoy3F0 8aTZ+e/sj+r4VTOUB/b0jy+JPnxn23FktGIYnQ+lLsAkmcbcDwCop4V59weR2eqwBqedNRUX 5OTP93lUIhrRIy3cZT/A5nNcUeCYRS8bCRFKrQKEn92RFg== To: "linux-mips@vger.kernel.org" Message-ID: Date: Sat, 22 Jun 2019 14:40:26 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Hi, When I add a WARN_ON(1) to trigger a backtrace into the static callback function veth_newlink() in drivers/net/veth.c the backtrace stops at this functions. When I remove the static from this function the backtrace is looking like expected. Call trace with static function: [ 30.686208] Call Trace: [ 30.686583] [<8010ca98>] show_stack+0x90/0x138 [ 30.686953] [<8066ae80>] dump_stack+0x94/0xcc [ 30.687122] [<801307cc>] __warn+0x130/0x144 [ 30.687293] [<80130898>] warn_slowpath_null+0x44/0x58 [ 30.687545] [] 0xc0023800 [ 30.687959] ---[ end trace df91e2ca103d67ec ]--- Call trace without static: [ 26.519328] Call Trace: [ 26.519648] [<8010ca98>] show_stack+0x90/0x138 [ 26.520067] [<8066ae80>] dump_stack+0x94/0xcc [ 26.520282] [<801307cc>] __warn+0x130/0x144 [ 26.520466] [<80130898>] warn_slowpath_null+0x44/0x58 [ 26.520773] [] veth_newlink+0x64/0x1464 [veth] [ 26.521041] [<80541628>] __rtnl_newlink+0x5c8/0x790 [ 26.521259] [<80541840>] rtnl_newlink+0x50/0x84 [ 26.521456] [<8053b430>] rtnetlink_rcv_msg+0x340/0x3ec [ 26.521697] [<80571ba4>] netlink_rcv_skb+0xa0/0x150 [ 26.521908] [<805712d8>] netlink_unicast+0x1c4/0x2b0 [ 26.522121] [<805716ac>] netlink_sendmsg+0x2e8/0x3f8 [ 26.522336] [<804fcf6c>] ___sys_sendmsg+0x144/0x2ac [ 26.522546] [<804fe22c>] __sys_sendmsg+0x4c/0x94 [ 26.522748] [<80114a98>] syscall_common+0x34/0x58 [ 26.523214] ---[ end trace 9a18b9fb2030ab29 ]--- This was done with kernel 5.2-rc5 build with OpenWrt (GCC 7.4) for Malta 24Kc big endian, the kernel did not contain any extra OpenWrt patches, only the WARN_ON(1) was added to trigger this call trace. Is it excepted that the call trace stops at such positions? It would be really nice if it would go further to better interpret such call traces. I used this command to call this function: ip link add veth0 type veth peer name veth1 I also saw this with kernel 4.9. Hauke