From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f72.google.com (mail-ot1-f72.google.com [209.85.210.72]) (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 32A8421638D for ; Sun, 15 Feb 2026 14:17:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.72 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771165044; cv=none; b=tpPt1Msa0QvdxOnp6P52clhFbyPAhCqgqoTAg9JkEwlcxX8/vLhPcG92s9UxSjmR0BgiHauRzqEv3hhJF3NWux7Ce7sycciZwL57v689irD96SAE35nKqqs6QB7SbZvKoL0EFxdRuRymoGU5j6GHZAqf8kgo3r3NyQuy5M7n24M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771165044; c=relaxed/simple; bh=ZBLB7jFPV8OZ7V3p93BOQLk28F7cz08wYQ94FSvB4ss=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=GCoCqy4s9y5E7miI82GOjLTK9iXM3y6Ei226Gk2AbgBhgqST56JKXRX6vWY2Dvb1sTzkqjJsr+PaEVsunjh6I5/7s5yxlybl/zjPQ0wR3v8mRXcBNU1m7oYt3ZYJ11KXv/6iCpzTRMSTt5oSNwAMR6QCDOguF0ELbfF+ULS6Y/Y= 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=209.85.210.72 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-f72.google.com with SMTP id 46e09a7af769-7d18fa0728aso21502056a34.0 for ; Sun, 15 Feb 2026 06:17:22 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1771165042; x=1771769842; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=KFQ0suPqLa7s93qRuDqntHlf05CVVhmbHVLlG5/KLUU=; b=SsI37duA8q3DfWKg9hyYj+uPBYBEUW0H0qVsNYL0ATo3CpdOg0+1sVdbZo16Aq9u6G 4+6AvqfwJHbIFe1SdS4F/YrCszuF6NasqV56oy+mvy+mnZ3ulOE9H8lE4/DKcHqZdZyl Noo98SyRP45rljUYLBPhK4YfiRgWzObs7lwW9nYZQrGsP0cDhBthcB+D48Az47DhXQYp /Mq7pMzzmkoC0gRJTTgMATnFRHfiPBVkyonI2arcd8kbDqLb6ep/65z2NX65kBRt8KaT xKxgBgjnn3cKpUpn1dZ1elBHTzdqFYSjLIYDek43A8/LzE5/FgV+X3GyZJoHygxR3NRM Ijdg== X-Forwarded-Encrypted: i=1; AJvYcCXgOliy5OHg2w7Og7ct+NVRjoWoHA+pITk+h5ug2FZO92b8HTUqvMfvT+xycTCdZ7TDg4omPhHy7dGy0FH4UtyAih0=@vger.kernel.org X-Gm-Message-State: AOJu0Yx7JO5XUY/sElGFzVgvgN8F1E57sluxQc6oeukttfDZ/6BmNTde lKXUe/kVYkMHt4zCC1olQDlVbrsAxK4Sl/ONjpHqPRCEWTTbDfHbYUUxKyySZNfUe0v6KFohzxn Bh+XWmgDiZROat5Yd6iE6x7dOonVYsZt0gOf/VoBGy3V1mxa7EoPwBkPZqW4= Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1623:b0:659:9a49:8f9a with SMTP id 006d021491bc7-6785989e4abmr2824842eaf.19.1771165042168; Sun, 15 Feb 2026 06:17:22 -0800 (PST) Date: Sun, 15 Feb 2026 06:17:22 -0800 In-Reply-To: <691367ae.a70a0220.22f260.0141.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6991d572.050a0220.2757fb.0031.GAE@google.com> Subject: Re: [syzbot] [block?] [trace?] INFO: task hung in blk_trace_startstop From: syzbot To: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com, mhiramat@kernel.org, rostedt@goodmis.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 635c467cc14e Add linux-next specific files for 20260213 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=14d8ec02580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f09eec269f9f4746 dashboard link: https://syzkaller.appspot.com/bug?extid=774863666ef5b025c9d0 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12cc2ffa580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/24870d51cbd0/disk-635c467c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/49283c738806/vmlinux-635c467c.xz kernel image: https://storage.googleapis.com/syzbot-assets/8c5f9d1da977/bzImage-635c467c.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/b01c09978893/mount_0.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=163e915a580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+774863666ef5b025c9d0@syzkaller.appspotmail.com INFO: task syz.3.20:6102 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.20 state:D stack:28368 pid:6102 tgid:6087 ppid:5957 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0x1585/0x5340 kernel/sched/core.c:6907 __schedule_loop kernel/sched/core.c:6989 [inline] schedule+0x164/0x360 kernel/sched/core.c:7004 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061 __mutex_lock_common kernel/locking/mutex.c:692 [inline] __mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776 blk_trace_startstop+0x8f/0x610 kernel/trace/blktrace.c:901 blk_trace_ioctl+0x315/0x740 kernel/trace/blktrace.c:947 blkdev_common_ioctl+0x13a7/0x3250 block/ioctl.c:724 blkdev_ioctl+0x528/0x740 block/ioctl.c:798 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f530c39bf79 RSP: 002b:00007f530d2e4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f530c616180 RCX: 00007f530c39bf79 RDX: 0000000000000000 RSI: 0000000000001275 RDI: 0000000000000007 RBP: 00007f530c4327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f530c616218 R14: 00007f530c616180 R15: 00007ffdd027c568 INFO: task syz.2.19:6109 blocked for more than 150 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.19 state:D stack:26720 pid:6109 tgid:6091 ppid:5955 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0x1585/0x5340 kernel/sched/core.c:6907 __schedule_loop kernel/sched/core.c:6989 [inline] schedule+0x164/0x360 kernel/sched/core.c:7004 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061 __mutex_lock_common kernel/locking/mutex.c:692 [inline] __mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776 relay_open+0x3b8/0x920 kernel/relay.c:516 blk_trace_setup_prepare+0x425/0x5a0 kernel/trace/blktrace.c:716 blk_trace_setup+0x2c0/0x430 kernel/trace/blktrace.c:789 blk_trace_ioctl+0x380/0x740 kernel/trace/blktrace.c:935 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.