From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f71.google.com (mail-ot1-f71.google.com [209.85.210.71]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1DA052E2840 for ; Sun, 11 Oct 2026 15:15:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.71 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791731744; cv=none; b=IclH7ExLbZ9PcgDqFhPkV5S6ACt7d04TnppTN9BIbk1OKf1MvS0vpUtSt7BlNMMo5shYDgogCc5aUye0HPegV5Jag4hK/zVePrjA6rEpVHTO/bXmafgsr3/gQkFG0LiYMe0mIQo9aYl/59HA/7v96sZZY8sBKWfjAwsT5+ofiDQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791731744; c=relaxed/simple; bh=ANNVqgJdmrNQ9AL58yAXj/cF93/gby6n1PzlmscFVZE=; h=MIME-Version:Date:Message-ID:Subject:From:To:Cc:Content-Type; b=eDa7KsWvXPTF04/VRE02F+Aasxp/QcUucGnJTmpL5BLWaQAyLbz0nsefF5svJuyzo+9WQFuwp8yLI59lDnAuJJkJb5gehn6izTaXQWEVecNLeTUjdatALAOeNFWgTck3kOdnRvFcyD0+Wwgg98mkkPH4QVk2FPa61VqDw0LxmCo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.210.71 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-ot1-f71.google.com with SMTP id 46e09a7af769-82169fb66c3so2768150a34.2 for ; Sun, 11 Oct 2026 08:15:40 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1791731739; x=1792336539; h=content-type:cc:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=2MbI4o+5vFdZBDMSio/+lzxhqzX/QtnY+dv5QrE3jJE=; b=JhcBil2rTmUyPGxKsqUs3h7a56Oh2poRtjZHPd/vSDqI7BIO0uHJhmue/xaqXGL+Xm dE7eC8BSWffI0M08DZcYcAZshyQFQmzbROm1TNtmI9c591vx//z6KVNcJBxCbp++cAsW 6fMvTnsKZtg39T8No3YlDSv2q4ek2fFrJ34V+gl/DYMhQq6/Q1m1LEK9xfnF1wIFLL4Y ebnmjxytkB9aDW7dyQIHf9TgMIa/qQWbeoeYsPYIGjsxtpbov3qqKOTi0BPS1sdy8MlZ 9Z7kVRvPmOdjnGDaTtc9apOcgfW9Pu/DK2e3K8xidjfzUAqcj2aqlsvzGnAXBfdg7Xng 9ShQ== X-Gm-Message-State: AFq9FYKljAPPhU6144SVGk8Y0xPjpmM9YIyjgTpwhlkmYMtWicO7rpMr G2wJAzfkAgOrzzfCDOsFrGImSaaMCf+kt3lpnBFOKeJXF8Frv72t9hdm1c7JYnVGgWcPqTgAMfH TSBdWFHxBFT28buq+lHXUB/OZzOYoNcRbLocnZ/cuR1zwknLhVvw9U8RgsF4= Precedence: bulk X-Mailing-List: syzbot@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:190b:b0:4f8:4ec9:b170 with SMTP id 5614622812f47-50c415de52amr8200094b6e.2.1791731739767; Sun, 11 Oct 2026 08:15:39 -0700 (PDT) Date: Sun, 11 Oct 2026 08:15:39 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6acba81b.bbc4c7f9.15faa7.0084.GAE@google.com> Subject: [moderation/CI] Re: loop: Detect write requests that failed to wait for completion. From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] loop: Detect write requests that failed to wait for completion. https://lore.kernel.org/all/380f04ef-902d-4664-9ae3-228692d2efb9@I-love.SAKURA.ne.jp * [PATCH] loop: Detect write requests that failed to wait for completion. and found the following issues: * BUG: syz.NUM.NUM/NUM is doing I/O request on loop1 in Lo_rundown state. * BUG: syz.NUM.NUM/NUM is doing I/O request on loop4 in Lo_rundown state. Full report is available here: https://ci.syzbot.org/series/1d6e1ed8-5255-4499-b944-1491f0fc2111 *** BUG: syz.NUM.NUM/NUM is doing I/O request on loop1 in Lo_rundown state. tree: axboe URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/axboe/linux.git base: 4da93acb4f2ed06640255ad98801d0f0c734ff07 arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/9ff9d467-08f4-48f3-814f-1605ea27467a/config syz repro: https://ci.syzbot.org/findings/2daf7154-e0e1-4e75-863e-48d5787f46d1/syz_repro BUG: syz.1.1804/9447 is doing I/O request on loop1 in Lo_rundown state. Call Trace: loop_queue_rq+0x8b/0xed0 drivers/block/loop.c:1902 __blk_mq_issue_directly block/blk-mq.c:2708 [inline] blk_mq_try_issue_directly+0x3f4/0x880 block/blk-mq.c:2768 blk_mq_submit_bio+0x21de/0x2bb0 block/blk-mq.c:3220 __submit_bio_noacct_mq block/blk-core.c:756 [inline] submit_bio_noacct_nocheck+0x2f4/0xa40 block/blk-core.c:790 bh_submit fs/buffer.c:1146 [inline] __bh_read fs/buffer.c:2943 [inline] bh_readahead include/linux/buffer_head.h:437 [inline] __breadahead+0x15c/0x1f0 fs/buffer.c:1359 nilfs_search_super_root+0x2be/0x1530 fs/nilfs2/recovery.c:891 load_nilfs+0x363/0xfb0 fs/nilfs2/the_nilfs.c:259 nilfs_fill_super+0x1a0/0x4e0 fs/nilfs2/super.c:1073 nilfs_get_tree+0x491/0x850 fs/nilfs2/super.c:1226 vfs_get_tree+0x92/0x2a0 fs/super.c:1932 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3772 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3848 do_mount fs/namespace.c:4181 [inline] __do_sys_mount fs/namespace.c:4397 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4374 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: syz.1.1804/9447 is doing I/O request on loop1 in Lo_rundown state. Call Trace: loop_queue_rq+0x8b/0xed0 drivers/block/loop.c:1902 __blk_mq_issue_directly block/blk-mq.c:2708 [inline] blk_mq_try_issue_directly+0x3f4/0x880 block/blk-mq.c:2768 blk_mq_submit_bio+0x21de/0x2bb0 block/blk-mq.c:3220 __submit_bio_noacct_mq block/blk-core.c:756 [inline] submit_bio_noacct_nocheck+0x2f4/0xa40 block/blk-core.c:790 bh_submit fs/buffer.c:1146 [inline] __bh_read fs/buffer.c:2943 [inline] bh_readahead include/linux/buffer_head.h:437 [inline] __breadahead+0x15c/0x1f0 fs/buffer.c:1359 nilfs_search_super_root+0x2be/0x1530 fs/nilfs2/recovery.c:891 load_nilfs+0x363/0xfb0 fs/nilfs2/the_nilfs.c:259 nilfs_fill_super+0x1a0/0x4e0 fs/nilfs2/super.c:1073 nilfs_get_tree+0x491/0x850 fs/nilfs2/super.c:1226 vfs_get_tree+0x92/0x2a0 fs/super.c:1932 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3772 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3848 do_mount fs/namespace.c:4181 [inline] __do_sys_mount fs/namespace.c:4397 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4374 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: syz.1.1804/9447 is doing I/O request on loop1 in Lo_rundown state. Call Trace: loop_queue_rq+0x8b/0xed0 drivers/block/loop.c:1902 __blk_mq_issue_directly block/blk-mq.c:2708 [inline] blk_mq_try_issue_directly+0x3f4/0x880 block/blk-mq.c:2768 blk_mq_submit_bio+0x21de/0x2bb0 block/blk-mq.c:3220 __submit_bio_noacct_mq block/blk-core.c:756 [inline] submit_bio_noacct_nocheck+0x2f4/0xa40 block/blk-core.c:790 bh_submit fs/buffer.c:1146 [inline] __bh_read fs/buffer.c:2943 [inline] bh_readahead include/linux/buffer_head.h:437 [inline] __breadahead+0x15c/0x1f0 fs/buffer.c:1359 nilfs_search_super_root+0x2be/0x1530 fs/nilfs2/recovery.c:891 load_nilfs+0x363/0xfb0 fs/nilfs2/the_nilfs.c:259 nilfs_fill_super+0x1a0/0x4e0 fs/nilfs2/super.c:1073 nilfs_get_tree+0x491/0x850 fs/nilfs2/super.c:1226 vfs_get_tree+0x92/0x2a0 fs/super.c:1932 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3772 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3848 do_mount fs/namespace.c:4181 [inline] __do_sys_mount fs/namespace.c:4397 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4374 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: syz.1.1804/9447 is doing I/O request on loop1 in Lo_rundown state. Call Trace: loop_queue_rq+0x8b/0xed0 drivers/block/loop.c:1902 __blk_mq_issue_directly block/blk-mq.c:2708 [inline] blk_mq_try_issue_directly+0x3f4/0x880 block/blk-mq.c:2768 blk_mq_submit_bio+0x21de/0x2bb0 block/blk-mq.c:3220 __submit_bio_noacct_mq block/blk-core.c:756 [inline] submit_bio_noacct_nocheck+0x2f4/0xa40 block/blk-core.c:790 bh_submit fs/buffer.c:1146 [inline] __bh_read fs/buffer.c:2943 [inline] bh_readahead include/linux/buffer_head.h:437 [inline] __breadahead+0x15c/0x1f0 fs/buffer.c:1359 nilfs_search_super_root+0x2be/0x1530 fs/nilfs2/recovery.c:891 load_nilfs+0x363/0xfb0 fs/nilfs2/the_nilfs.c:259 nilfs_fill_super+0x1a0/0x4e0 fs/nilfs2/super.c:1073 nilfs_get_tree+0x491/0x850 fs/nilfs2/super.c:1226 vfs_get_tree+0x92/0x2a0 fs/super.c:1932 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3772 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3848 do_mount fs/namespace.c:4181 [inline] __do_sys_mount fs/namespace.c:4397 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4374 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: syz.1.1804/9447 is doing I/O request on loop1 in Lo_rundown state. Call Trace: loop_queue_rq+0x8b/0xed0 drivers/block/loop.c:1902 __blk_mq_issue_directly block/blk-mq.c:2708 [inline] blk_mq_try_issue_directly+0x3f4/0x880 block/blk-mq.c:2768 blk_mq_submit_bio+0x21de/0x2bb0 block/blk-mq.c:3220 __submit_bio_noacct_mq block/blk-core.c:756 [inline] submit_bio_noacct_nocheck+0x2f4/0xa40 block/blk-core.c:790 bh_submit fs/buffer.c:1146 [inline] __bh_read fs/buffer.c:2943 [inline] bh_readahead include/linux/buffer_head.h:437 [inline] __breadahead+0x15c/0x1f0 fs/buffer.c:1359 nilfs_search_super_root+0x2be/0x1530 fs/nilfs2/recovery.c:891 load_nilfs+0x363/0xfb0 fs/nilfs2/the_nilfs.c:259 nilfs_fill_super+0x1a0/0x4e0 fs/nilfs2/super.c:1073 nilfs_get_tree+0x491/0x850 fs/nilfs2/super.c:1226 vfs_get_tree+0x92/0x2a0 fs/super.c:1932 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3772 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3848 do_mount fs/namespace.c:4181 [inline] __do_sys_mount fs/namespace.c:4397 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4374 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f bridge0: port 1(bridge_slave_0) entered blocking state bridge0: port 1(bridge_slave_0) entered forwarding state *** BUG: syz.NUM.NUM/NUM is doing I/O request on loop4 in Lo_rundown state. tree: axboe URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/axboe/linux.git base: 4da93acb4f2ed06640255ad98801d0f0c734ff07 arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/9ff9d467-08f4-48f3-814f-1605ea27467a/config AI triage: https://ci.syzbot.org/findings/99783fd2-a03a-4f81-a151-fc2aaea45886/triage_trajectory BUG: syz.4.84/6446 is doing I/O request on loop4 in Lo_rundown state. Call Trace: loop_queue_rq+0x8b/0xed0 blk_mq_try_issue_directly+0x3f4/0x880 blk_mq_submit_bio+0x21de/0x2bb0 submit_bio_noacct_nocheck+0x2f4/0xa40 __breadahead+0x15c/0x1f0 nilfs_search_super_root+0x2be/0x1530 load_nilfs+0x363/0xfb0 nilfs_fill_super+0x1a0/0x4e0 nilfs_get_tree+0x491/0x850 vfs_get_tree+0x92/0x2a0 do_new_mount+0x319/0xdc0 __se_sys_mount+0x31d/0x420 do_syscall_64+0x166/0x520 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: syz.4.84/6446 is doing I/O request on loop4 in Lo_rundown state. Call Trace: loop_queue_rq+0x8b/0xed0 blk_mq_try_issue_directly+0x3f4/0x880 blk_mq_submit_bio+0x21de/0x2bb0 submit_bio_noacct_nocheck+0x2f4/0xa40 __breadahead+0x15c/0x1f0 nilfs_search_super_root+0x2be/0x1530 load_nilfs+0x363/0xfb0 nilfs_fill_super+0x1a0/0x4e0 nilfs_get_tree+0x491/0x850 vfs_get_tree+0x92/0x2a0 do_new_mount+0x319/0xdc0 __se_sys_mount+0x31d/0x420 do_syscall_64+0x166/0x520 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: syz.4.84/6446 is doing I/O request on loop4 in Lo_rundown state. Call Trace: loop_queue_rq+0x8b/0xed0 blk_mq_try_issue_directly+0x3f4/0x880 blk_mq_submit_bio+0x21de/0x2bb0 submit_bio_noacct_nocheck+0x2f4/0xa40 __breadahead+0x15c/0x1f0 nilfs_search_super_root+0x2be/0x1530 load_nilfs+0x363/0xfb0 nilfs_fill_super+0x1a0/0x4e0 nilfs_get_tree+0x491/0x850 vfs_get_tree+0x92/0x2a0 do_new_mount+0x319/0xdc0 __se_sys_mount+0x31d/0x420 do_syscall_64+0x166/0x520 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: syz.4.84/6446 is doing I/O request on loop4 in Lo_rundown state. Call Trace: loop_queue_rq+0x8b/0xed0 blk_mq_try_issue_directly+0x3f4/0x880 blk_mq_submit_bio+0x21de/0x2bb0 submit_bio_noacct_nocheck+0x2f4/0xa40 __breadahead+0x15c/0x1f0 nilfs_search_super_root+0x2be/0x1530 load_nilfs+0x363/0xfb0 nilfs_fill_super+0x1a0/0x4e0 nilfs_get_tree+0x491/0x850 vfs_get_tree+0x92/0x2a0 do_new_mount+0x319/0xdc0 __se_sys_mount+0x31d/0x420 do_syscall_64+0x166/0x520 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: syz.4.84/6446 is doing I/O request on loop4 in Lo_rundown state. Call Trace: loop_queue_rq+0x8b/0xed0 blk_mq_try_issue_directly+0x3f4/0x880 blk_mq_submit_bio+0x21de/0x2bb0 submit_bio_noacct_nocheck+0x2f4/0xa40 __breadahead+0x15c/0x1f0 nilfs_search_super_root+0x2be/0x1530 load_nilfs+0x363/0xfb0 nilfs_fill_super+0x1a0/0x4e0 nilfs_get_tree+0x491/0x850 vfs_get_tree+0x92/0x2a0 do_new_mount+0x319/0xdc0 __se_sys_mount+0x31d/0x420 do_syscall_64+0x166/0x520 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: syz.4.84/6446 is doing I/O request on loop4 in Lo_rundown state. Call Trace: loop_queue_rq+0x8b/0xed0 blk_mq_try_issue_directly+0x3f4/0x880 blk_mq_submit_bio+0x21de/0x2bb0 submit_bio_noacct_nocheck+0x2f4/0xa40 __breadahead+0x15c/0x1f0 nilfs_search_super_root+0x2be/0x1530 load_nilfs+0x363/0xfb0 nilfs_fill_super+0x1a0/0x4e0 nilfs_get_tree+0x491/0x850 vfs_get_tree+0x92/0x2a0 do_new_mount+0x319/0xdc0 __se_sys_mount+0x31d/0x420 do_syscall_64+0x166/0x520 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: syz.4.84/6446 is doing I/O request on loop4 in Lo_rundown state. Call Trace: loop_queue_rq+0x8b/0xed0 blk_mq_try_issue_directly+0x3f4/0x880 blk_mq_submit_bio+0x21de/0x2bb0 submit_bio_noacct_nocheck+0x2f4/0xa40 __breadahead+0x15c/0x1f0 nilfs_search_super_root+0x2be/0x1530 load_nilfs+0x363/0xfb0 nilfs_fill_super+0x1a0/0x4e0 nilfs_get_tree+0x491/0x850 vfs_get_tree+0x92/0x2a0 do_new_mount+0x319/0xdc0 __se_sys_mount+0x31d/0x420 do_syscall_64+0x166/0x520 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: syz.4.84/6446 is doing I/O request on loop4 in Lo_rundown state. Call Trace: loop_queue_rq+0x8b/0xed0 blk_mq_try_issue_directly+0x3f4/0x880 blk_mq_submit_bio+0x21de/0x2bb0 submit_bio_noacct_nocheck+0x2f4/0xa40 __breadahead+0x15c/0x1f0 nilfs_search_super_root+0x2be/0x1530 load_nilfs+0x363/0xfb0 nilfs_fill_super+0x1a0/0x4e0 nilfs_get_tree+0x491/0x850 vfs_get_tree+0x92/0x2a0 do_new_mount+0x319/0xdc0 __se_sys_mount+0x31d/0x420 do_syscall_64+0x166/0x520 entry_SYSCALL_64_after_hwframe+0x77/0x7f *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a fix for this bug, please reply with `#syz test` (on a separate line) and attach the patch to the email. Notes: - The patch will be applied on top of the tested series (as an incremental fix). - To test a new version of the whole series, please send it directly to syzbot@lists.linux.dev. - Arguments like custom git repos and branches are not supported. The email will later be sent to: [axboe@kernel.dk bvanassche@acm.org eadavis@qq.com hch@lst.de jfs-discussion@lists.sourceforge.net linux-block@vger.kernel.org nilay@linux.ibm.com penguin-kernel@i-love.sakura.ne.jp shaggy@kernel.org] If the report looks fine to you, reply with: #syz upstream If the report is a false positive, reply with #syz invalid