From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B4C05207A0B; Thu, 11 Dec 2025 07:36:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765438610; cv=none; b=r1eP+YaFaIUZrICjjsfYc9Vq1KLYLcFW+8dZDXa+yaWGbkbnwnT2ennz0um6nwkjEjjVs5igkDsBDysEMkj6HNwpJk3ImYMY0X8yyrtlTlkCKC1hhvaSgQz4y6VokUulYmbsdtpfCIxV0GTHygs53d+s13idCW4QX/knxK4n8CY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765438610; c=relaxed/simple; bh=oHTkkQXfAGe+7pErwoq6ZNY8NvO3+FmNlnMjivgegfM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=YbMCGZcEL6BhDdII1WzZc+Q9cIDHxpXrCLUhXgkcc19WzewVWYCLnsyAroS0fVktIvZ1lL8GeREuQ4IzbwHjqGr3XCXtCPRXnRJkJyHP46CxO5YA3BlqcidsNqb2CobTp3z22JexiFq2p21rRmpAlU28S8kYxgEp3TmvrEGrc8o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mAdW/f2M; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="mAdW/f2M" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B0187C4CEFB; Thu, 11 Dec 2025 07:36:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1765438610; bh=oHTkkQXfAGe+7pErwoq6ZNY8NvO3+FmNlnMjivgegfM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=mAdW/f2MlRguvo+rLdR7RJinX//x/q28RdTY7G3cao1P45oJWtbOEgoBAZnnjBTs0 RWOp+Omtidi2Tkaroji5b9mzp5QveBIL6lQX3nSLsaJPGcTYkgyr9ohBc1ELQrY2sP BLTeDWtB0v4KW0P1Hhl0R87/hx0TYnQt5tKuQd6vbZrWaYp0p+u6k/c5XKWqVkKmVj aQ/9peuG3O4Kv0MOUiiUzesloBg3LZM+DDhTN+Pa0e20dHTA6rgCe5k3/1WhXU42W/ K3hQ6E3WExNdyDmlDer3qF7yVpZtbulAaZ3bdZX0pmzkP6vl3tMXQZg6V7NHLJgKYM oyluypFFwJnKg== Date: Thu, 11 Dec 2025 16:36:46 +0900 From: Will Deacon To: syzbot Cc: iommu@lists.linux.dev, joro@8bytes.org, linux-kernel@vger.kernel.org, robin.murphy@arm.com, syzkaller-bugs@googlegroups.com, jgg@ziepe.ca Subject: Re: [syzbot] [iommu?] kernel BUG in iommu_pages_start_incoherent Message-ID: References: <693a39de.050a0220.4004e.02ce.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <693a39de.050a0220.4004e.02ce.GAE@google.com> [+Jason] On Wed, Dec 10, 2025 at 07:26:22PM -0800, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: c06c303832ec ocfs2: fix xattr array entry __counted_by error > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=175a2992580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=d3ce1cfe3996fc8b > dashboard link: https://syzkaller.appspot.com/bug?extid=e06bb7478e687f235ad7 > compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-c06c3038.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/aa14148a2ef4/vmlinux-c06c3038.xz > kernel image: https://storage.googleapis.com/syzbot-assets/d2d5f3a106bf/bzImage-c06c3038.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+e06bb7478e687f235ad7@syzkaller.appspotmail.com > > Call Trace: > > dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 > fail_dump lib/fault-inject.c:73 [inline] > should_fail_ex+0x414/0x560 lib/fault-inject.c:174 > prepare_alloc_pages+0x22b/0x650 mm/page_alloc.c:4985 > __alloc_frozen_pages_noprof+0x123/0x370 mm/page_alloc.c:5199 > __alloc_pages_noprof mm/page_alloc.c:5244 [inline] > __folio_alloc_noprof+0x18/0x120 mm/page_alloc.c:5254 > __folio_alloc_node_noprof include/linux/gfp.h:296 [inline] > iommu_alloc_pages_node_sz+0x152/0x320 drivers/iommu/iommu-pages.c:66 > _table_alloc drivers/iommu/generic_pt/iommu_pt.h:373 [inline] > table_alloc drivers/iommu/generic_pt/iommu_pt.h:408 [inline] > pt_iommu_new_table drivers/iommu/generic_pt/iommu_pt.h:424 [inline] > __map_range+0x1f2/0xa80 drivers/iommu/generic_pt/iommu_pt.h:584 > pt_descend drivers/iommu/generic_pt/pt_iter.h:391 [inline] > __map_range+0x511/0xa80 drivers/iommu/generic_pt/iommu_pt.h:619 > pt_descend drivers/iommu/generic_pt/pt_iter.h:391 [inline] > __map_range+0x511/0xa80 drivers/iommu/generic_pt/iommu_pt.h:619 > pt_iommu_vtdss_map_pages+0x6a3/0x960 drivers/iommu/generic_pt/iommu_pt.h:905 > iommu_map_nosync+0x30a/0x840 drivers/iommu/iommu.c:2549 > iommu_map_sg+0x579/0xae0 drivers/iommu/iommu.c:2721 > iommu_dma_map_sg+0x908/0x1000 drivers/iommu/dma-iommu.c:1493 > __dma_map_sg_attrs+0xd0/0x520 kernel/dma/mapping.c:245 > dma_map_sg_attrs+0x32/0x50 kernel/dma/mapping.c:284 > ata_sg_setup drivers/ata/libata-core.c:4773 [inline] > ata_qc_issue+0x515/0xf30 drivers/ata/libata-core.c:5085 > ata_scsi_translate drivers/ata/libata-scsi.c:1755 [inline] > __ata_scsi_queuecmd+0x957/0xf60 drivers/ata/libata-scsi.c:4355 > ata_scsi_queuecmd+0x3d4/0x5c0 drivers/ata/libata-scsi.c:4400 > scsi_dispatch_cmd drivers/scsi/scsi_lib.c:1638 [inline] > scsi_queue_rq+0x18bc/0x30d0 drivers/scsi/scsi_lib.c:1895 > blk_mq_dispatch_rq_list+0x4c0/0x1900 block/blk-mq.c:2137 > __blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline] > blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline] > __blk_mq_sched_dispatch_requests+0xdac/0x1570 block/blk-mq-sched.c:307 > blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329 > blk_mq_run_hw_queue+0x404/0x4f0 block/blk-mq.c:2375 > blk_mq_dispatch_list+0xd0b/0xe00 include/linux/spinlock.h:-1 > blk_mq_flush_plug_list+0x469/0x550 block/blk-mq.c:2986 > blk_add_rq_to_plug+0x175/0x450 block/blk-mq.c:1407 > blk_mq_submit_bio+0xd5b/0x26b0 block/blk-mq.c:3232 > __submit_bio+0x207/0x5a0 block/blk-core.c:637 > __submit_bio_noacct_mq block/blk-core.c:724 [inline] > submit_bio_noacct_nocheck+0x377/0xa30 block/blk-core.c:755 > __blkdev_direct_IO+0x915/0xf90 block/fops.c:264 > blkdev_direct_IO+0x1261/0x17e0 block/fops.c:441 > blkdev_direct_write+0x7c/0x140 block/fops.c:727 > blkdev_write_iter+0x547/0x710 block/fops.c:795 > do_iter_readv_writev+0x623/0x8c0 fs/read_write.c:-1 > vfs_writev+0x31a/0x960 fs/read_write.c:1057 > do_writev+0x14d/0x2d0 fs/read_write.c:1103 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fae01b8f7c9 > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007fae02b02038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 > RAX: ffffffffffffffda RBX: 00007fae01de5fa0 RCX: 00007fae01b8f7c9 > RDX: 0000000000000021 RSI: 0000200000000a40 RDI: 0000000000000004 > RBP: 00007fae02b02090 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 > R13: 00007fae01de6038 R14: 00007fae01de5fa0 R15: 00007ffd45480c38 > > ------------[ cut here ]------------ > kernel BUG at arch/x86/mm/physaddr.c:28! > Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI > CPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 > RIP: 0010:__phys_addr+0x16b/0x180 arch/x86/mm/physaddr.c:28 > Code: 8b b3 00 e9 45 ff ff ff e8 b2 af 4b 00 48 c7 c7 f0 33 fb 8d 48 89 de 4c 89 f2 e8 50 c0 52 03 e9 4d ff ff ff e8 96 af 4b 00 90 <0f> 0b e8 8e af 4b 00 90 0f 0b e8 86 af 4b 00 90 0f 0b 0f 1f 00 90 > RSP: 0018:ffffc9000aae5f80 EFLAGS: 00010093 > RAX: ffffffff817610fa RBX: 0000778000000000 RCX: ffff8880007ca4c0 > RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000778000000000 > RBP: ffffc9000aae6130 R08: ffffffff8e26c433 R09: 1ffffffff1c4d886 > R10: dffffc0000000000 R11: fffffbfff1c4d887 R12: 0000000000000011 > R13: dffffc0000000000 R14: 0000000080000000 R15: dffffc0000000000 > FS: 00007fae02b026c0(0000) GS:ffff88808d23e000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fae01d2dea0 CR3: 000000000b669000 CR4: 0000000000352ef0 > Call Trace: > > virt_to_folio include/linux/mm.h:1432 [inline] > virt_to_ioptdesc drivers/iommu/iommu-pages.h:49 [inline] > iommu_pages_start_incoherent+0x52/0x310 drivers/iommu/iommu-pages.c:148 > _table_alloc drivers/iommu/generic_pt/iommu_pt.h:377 [inline] > table_alloc drivers/iommu/generic_pt/iommu_pt.h:408 [inline] > pt_iommu_new_table drivers/iommu/generic_pt/iommu_pt.h:424 [inline] > __map_range+0x270/0xa80 drivers/iommu/generic_pt/iommu_pt.h:584 > pt_descend drivers/iommu/generic_pt/pt_iter.h:391 [inline] > __map_range+0x511/0xa80 drivers/iommu/generic_pt/iommu_pt.h:619 > pt_descend drivers/iommu/generic_pt/pt_iter.h:391 [inline] > __map_range+0x511/0xa80 drivers/iommu/generic_pt/iommu_pt.h:619 > pt_iommu_vtdss_map_pages+0x6a3/0x960 drivers/iommu/generic_pt/iommu_pt.h:905 > iommu_map_nosync+0x30a/0x840 drivers/iommu/iommu.c:2549 > iommu_map_sg+0x579/0xae0 drivers/iommu/iommu.c:2721 > iommu_dma_map_sg+0x908/0x1000 drivers/iommu/dma-iommu.c:1493 > __dma_map_sg_attrs+0xd0/0x520 kernel/dma/mapping.c:245 > dma_map_sg_attrs+0x32/0x50 kernel/dma/mapping.c:284 > ata_sg_setup drivers/ata/libata-core.c:4773 [inline] > ata_qc_issue+0x515/0xf30 drivers/ata/libata-core.c:5085 > ata_scsi_translate drivers/ata/libata-scsi.c:1755 [inline] > __ata_scsi_queuecmd+0x957/0xf60 drivers/ata/libata-scsi.c:4355 > ata_scsi_queuecmd+0x3d4/0x5c0 drivers/ata/libata-scsi.c:4400 > scsi_dispatch_cmd drivers/scsi/scsi_lib.c:1638 [inline] > scsi_queue_rq+0x18bc/0x30d0 drivers/scsi/scsi_lib.c:1895 > blk_mq_dispatch_rq_list+0x4c0/0x1900 block/blk-mq.c:2137 > __blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline] > blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline] > __blk_mq_sched_dispatch_requests+0xdac/0x1570 block/blk-mq-sched.c:307 > blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329 > blk_mq_run_hw_queue+0x404/0x4f0 block/blk-mq.c:2375 > blk_mq_dispatch_list+0xd0b/0xe00 include/linux/spinlock.h:-1 > blk_mq_flush_plug_list+0x469/0x550 block/blk-mq.c:2986 > blk_add_rq_to_plug+0x175/0x450 block/blk-mq.c:1407 > blk_mq_submit_bio+0xd5b/0x26b0 block/blk-mq.c:3232 > __submit_bio+0x207/0x5a0 block/blk-core.c:637 > __submit_bio_noacct_mq block/blk-core.c:724 [inline] > submit_bio_noacct_nocheck+0x377/0xa30 block/blk-core.c:755 > __blkdev_direct_IO+0x915/0xf90 block/fops.c:264 > blkdev_direct_IO+0x1261/0x17e0 block/fops.c:441 > blkdev_direct_write+0x7c/0x140 block/fops.c:727 > blkdev_write_iter+0x547/0x710 block/fops.c:795 > do_iter_readv_writev+0x623/0x8c0 fs/read_write.c:-1 > vfs_writev+0x31a/0x960 fs/read_write.c:1057 > do_writev+0x14d/0x2d0 fs/read_write.c:1103 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fae01b8f7c9 > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007fae02b02038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 > RAX: ffffffffffffffda RBX: 00007fae01de5fa0 RCX: 00007fae01b8f7c9 > RDX: 0000000000000021 RSI: 0000200000000a40 RDI: 0000000000000004 > RBP: 00007fae02b02090 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 > R13: 00007fae01de6038 R14: 00007fae01de5fa0 R15: 00007ffd45480c38 > > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:__phys_addr+0x16b/0x180 arch/x86/mm/physaddr.c:28 > Code: 8b b3 00 e9 45 ff ff ff e8 b2 af 4b 00 48 c7 c7 f0 33 fb 8d 48 89 de 4c 89 f2 e8 50 c0 52 03 e9 4d ff ff ff e8 96 af 4b 00 90 <0f> 0b e8 8e af 4b 00 90 0f 0b e8 86 af 4b 00 90 0f 0b 0f 1f 00 90 > RSP: 0018:ffffc9000aae5f80 EFLAGS: 00010093 > RAX: ffffffff817610fa RBX: 0000778000000000 RCX: ffff8880007ca4c0 > RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000778000000000 > RBP: ffffc9000aae6130 R08: ffffffff8e26c433 R09: 1ffffffff1c4d886 > R10: dffffc0000000000 R11: fffffbfff1c4d887 R12: 0000000000000011 > R13: dffffc0000000000 R14: 0000000080000000 R15: dffffc0000000000 > FS: 00007fae02b026c0(0000) GS:ffff88808d23e000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fae01d2dea0 CR3: 000000000b669000 CR4: 0000000000352ef0 > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup