From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Bart Van Assche To: "mingo@kernel.org" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "linux-block@vger.kernel.org" , "kent.overstreet@gmail.com" , "axboe@kernel.dk" Subject: Re: [PATCH 00/10] Misc block layer patches for bcachefs Date: Thu, 17 May 2018 20:54:57 +0000 Message-ID: References: <20180509013358.16399-1-kent.overstreet@gmail.com> In-Reply-To: <20180509013358.16399-1-kent.overstreet@gmail.com> Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 List-ID: T24gVHVlLCAyMDE4LTA1LTA4IGF0IDIxOjMzIC0wNDAwLCBLZW50IE92ZXJzdHJlZXQgd3JvdGU6 DQo+IFsgLi4uIF0NCg0KSGVsbG8gS2VudCwNCg0KV2l0aCBKZW5zJyBsYXRlc3QgZm9yLW5leHQg YnJhbmNoIEkgaGl0IHRoZSBrZXJuZWwgd2FybmluZyBzaG93biBiZWxvdy4gQ2FuDQp5b3UgaGF2 ZSBhIGxvb2s/DQoNClRoYW5rcywNCg0KQmFydC4NCg0KDQo9PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0NCkJVRzogS0FTQU46 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dGVyLT5iaV9zaXplID0gMDsNCjc4ICAgICAgICAgICAgICAgICAgICAgIHJldHVybiBmYWxzZTsN Cjc5ICAgICAgICAgICAgICB9DQo4MA0KODEgICAgICAgICAgICAgIHdoaWxlIChieXRlcykgew0K ODIgICAgICAgICAgICAgICAgICAgICAgdW5zaWduZWQgaXRlcl9sZW4gPSBidmVjX2l0ZXJfbGVu KGJ2LCAqaXRlcik7DQo4MyAgICAgICAgICAgICAgICAgICAgICB1bnNpZ25lZCBsZW4gPSBtaW4o Ynl0ZXMsIGl0ZXJfbGVuKTsNCjg0DQo4NSAgICAgICAgICAgICAgICAgICAgICBieXRlcyAtPSBs ZW47DQo4NiAgICAgICAgICAgICAgICAgICAgICBpdGVyLT5iaV9zaXplIC09IGxlbjsNCg0KDQoN Cg0KDQoNCg== From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752280AbeEQUzD (ORCPT ); Thu, 17 May 2018 16:55:03 -0400 Received: from esa1.hgst.iphmx.com ([68.232.141.245]:9290 "EHLO esa1.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750924AbeEQUzB (ORCPT ); Thu, 17 May 2018 16:55:01 -0400 X-IronPort-AV: E=Sophos;i="5.49,412,1520870400"; d="scan'208";a="181504212" From: Bart Van Assche To: "mingo@kernel.org" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "linux-block@vger.kernel.org" , "kent.overstreet@gmail.com" , "axboe@kernel.dk" Subject: Re: [PATCH 00/10] Misc block layer patches for bcachefs Thread-Topic: [PATCH 00/10] Misc block layer patches for bcachefs Thread-Index: AQHT5zXcA2yvhxQJyUaLKhajN8kmNKQ0dDMA Date: Thu, 17 May 2018 20:54:57 +0000 Message-ID: References: <20180509013358.16399-1-kent.overstreet@gmail.com> In-Reply-To: <20180509013358.16399-1-kent.overstreet@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Bart.VanAssche@wdc.com; x-originating-ip: [199.255.44.250] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 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spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="utf-8" Content-ID: <887FC55360788849A1FEED2D5DF5ECFC@namprd04.prod.outlook.com> MIME-Version: 1.0 X-MS-Office365-Filtering-Correlation-Id: 4e0f0a2b-79ca-4e94-c521-08d5bc387341 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: 4e0f0a2b-79ca-4e94-c521-08d5bc387341 X-MS-Exchange-CrossTenant-originalarrivaltime: 17 May 2018 20:54:57.9111 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR04MB1073 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id w4HKt9H7010888 On Tue, 2018-05-08 at 21:33 -0400, Kent Overstreet wrote: > [ ... ] Hello Kent, With Jens' latest for-next branch I hit the kernel warning shown below. Can you have a look? Thanks, Bart. ================================================================== BUG: KASAN: use-after-free in bio_advance+0x110/0x1b0 Read of size 4 at addr ffff880156c5e6d0 by task ksoftirqd/10/72 CPU: 10 PID: 72 Comm: ksoftirqd/10 Tainted: G W 4.17.0-rc4-dbg+ #5 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014 Call Trace: dump_stack+0x9a/0xeb print_address_description+0x65/0x270 kasan_report+0x232/0x350 bio_advance+0x110/0x1b0 blk_update_request+0x9d/0x5a0 scsi_end_request+0x4c/0x300 [scsi_mod] scsi_io_completion+0x71e/0xa40 [scsi_mod] __blk_mq_complete_request+0x143/0x220 srp_recv_done+0x454/0x1100 [ib_srp] __ib_process_cq+0x9a/0xf0 [ib_core] ib_poll_handler+0x2d/0x90 [ib_core] irq_poll_softirq+0xe5/0x1e0 __do_softirq+0x112/0x5f0 run_ksoftirqd+0x29/0x50 smpboot_thread_fn+0x30f/0x410 kthread+0x1b2/0x1d0 ret_from_fork+0x24/0x30 Allocated by task 1356: kasan_kmalloc+0xa0/0xd0 kmem_cache_alloc+0xed/0x320 mempool_alloc+0xc6/0x210 bio_alloc_bioset+0x128/0x2d0 submit_bh_wbc+0x95/0x2d0 __block_write_full_page+0x2a6/0x5c0 __writepage+0x37/0x80 write_cache_pages+0x305/0x7c0 generic_writepages+0xb9/0x110 do_writepages+0x96/0x180 __filemap_fdatawrite_range+0x162/0x1b0 file_write_and_wait_range+0x4d/0xb0 blkdev_fsync+0x3c/0x70 do_fsync+0x33/0x60 __x64_sys_fsync+0x18/0x20 do_syscall_64+0x6d/0x220 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 72: __kasan_slab_free+0x130/0x180 kmem_cache_free+0xcd/0x380 blk_update_request+0xc4/0x5a0 blk_update_request+0xc4/0x5a0 scsi_end_request+0x4c/0x300 [scsi_mod] scsi_io_completion+0x71e/0xa40 [scsi_mod] __blk_mq_complete_request+0x143/0x220 srp_recv_done+0x454/0x1100 [ib_srp] __ib_process_cq+0x9a/0xf0 [ib_core] ib_poll_handler+0x2d/0x90 [ib_core] irq_poll_softirq+0xe5/0x1e0 __do_softirq+0x112/0x5f0 The buggy address belongs to the object at ffff880156c5e640 which belongs to the cache bio-0 of size 200 The buggy address is located 144 bytes inside of 200-byte region [ffff880156c5e640, ffff880156c5e708) The buggy address belongs to the page: page:ffffea00055b1780 count:1 mapcount:0 mapping:0000000000000000 index:0x0 compound_mapcount: 0 ib_srpt:srpt_zerolength_write: ib_srpt 10.196.159.179-24: queued zerolength write flags: 0x8000000000008100(slab|head) raw: 8000000000008100 0000000000000000 0000000000000000 0000000100190019 raw: ffffea000543a800 0000000200000002 ffff88015a8f3a00 0000000000000000 ib_srpt:srpt_zerolength_write: ib_srpt 10.196.159.179-22: queued zerolength write page dumped because: kasan: bad access detected ib_srpt:srpt_zerolength_write: ib_srpt 10.196.159.179-20: queued zerolength write Memory state around the buggy address: ib_srpt:srpt_zerolength_write: ib_srpt 10.196.159.179-18: queued zerolength write ffff880156c5e580: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ib_srpt:srpt_zerolength_write_done: ib_srpt 10.196.159.179-24 wc->status 5 ffff880156c5e600: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ib_srpt:srpt_zerolength_write_done: ib_srpt 10.196.159.179-22 wc->status 5 >ffff880156c5e680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ib_srpt:srpt_zerolength_write_done: ib_srpt 10.196.159.179-20 wc->status 5 ^ ffff880156c5e700: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ib_srpt:srpt_zerolength_write_done: ib_srpt 10.196.159.179-18 wc->status 5 ffff880156c5e780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ib_srpt:srpt_release_channel_work: ib_srpt 10.196.159.179-24 ================================================================== (gdb) list *(bio_advance+0x110) 0xffffffff81450090 is in bio_advance (./include/linux/bvec.h:82). 77 iter->bi_size = 0; 78 return false; 79 } 80 81 while (bytes) { 82 unsigned iter_len = bvec_iter_len(bv, *iter); 83 unsigned len = min(bytes, iter_len); 84 85 bytes -= len; 86 iter->bi_size -= len;