From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f78.google.com (mail-oo1-f78.google.com [209.85.161.78]) (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 683D03909B2 for ; Mon, 6 Apr 2026 19:55:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775505339; cv=none; b=oIOgH3BAhCJnsx6+Ucwq2jMcFUESuH8w94X4MDWSynJxo8DY7HxhsrdWgpXo4hQ3/XtfRUAnSo5tFJ4Sg6EHXMjFMDjnYKIlfAnC+TkhOk8X+qMnT7l0LObLnmoQfSTQaDBVJm8VLDC37aIOVCo5lKYoh3Vz1xtRGm6asbitauw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775505339; c=relaxed/simple; bh=rQKXXgAqWTg/Dsw0TFfIaXYDxtgCvJ8D3RvPHxOrsZc=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=vB5o/MJLtzr0yzi+0iJaLpggjX7LA7fIL1YbWY/n3yfzs2F36XM1D4szbZxeXBd9J4Fc5XPov/9X4Pffw13UT91bKnPIPrMEyGjVsZzvGw/jlY2MiE1B9mGMA1lKx+QoorYaNemRkigGwvc8Np5GRkYWkB7olvGIsSk+dfZQoNU= 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=209.85.161.78 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-oo1-f78.google.com with SMTP id 006d021491bc7-6853c243aedso1601929eaf.0 for ; Mon, 06 Apr 2026 12:55:38 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775505337; x=1776110137; 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=uDGeSu520UhCd3KRfrM/IDTj8HADwTneGXTVFyZaoHY=; b=bnj1UowAmOcyaUt3C6yj0DXHKEpTEzgGLDLAaWx9RBB+5wlSUWXnyooQyatlaCOvFI 51t9cAfJjwDemnPH/Om1oBwv8AttfClYYrnvi8i208vqPNyBjPFyonF8nq2wWqsBypR0 CYjswAnuhoSBMvq2aCHC5SMRWfhJrJHpXj6+fgHzbmSjArHH7pwkjU3rKh7I7WEm+Xsg vWw+l4JJLZIZLZ4V2aQj+DxfoVG4zh3u2mIyTFA60iJtTJEdX5x29NmjLq96/D0vtqox n+M3MQIK38pK+jx1XxU+UdBZx0zny4Gabr93QSJXLca2tKLrkG5uTih0A+chFUse/gas PQeA== X-Forwarded-Encrypted: i=1; AJvYcCVaBkmVSOp/LTCcorvWfP57VmJjaHxsfJNK4sEptvurf83LaCdAyXfZeDdOGqovMnJURmOKML0CNWYXcg==@vger.kernel.org X-Gm-Message-State: AOJu0YxgsCf8sZU9+FccE4lqGqmrh6VA+HG5lzyNY8UcFJlOdPH15wHS jMqvQmlUrrqlYHWXOqqXt1LUDoz6wkkM90+jnr6lf+wtXfDvcdi8D9VLeL2WshO2PlOfVN1k3Jp KmMj8glnbQKemLKPf9gPXPq+991I3+ZtD3gccTQVU8qVn9R+z4woM06jKA5o= Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2088:b0:67d:ec7b:cc9b with SMTP id 006d021491bc7-6821d83c79emr9482036eaf.16.1775505337374; Mon, 06 Apr 2026 12:55:37 -0700 (PDT) Date: Mon, 06 Apr 2026 12:55:37 -0700 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: <69d40fb9.a70a0220.a26f2.003d.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: 591cd656a1bf Linux 7.0-rc7 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=129136ba580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6754c86e8d9e4c91 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=1268ad4e580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1580b3da580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/6382829d7cc5/disk-591cd656.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/17a325d524d5/vmlinux-591cd656.xz kernel image: https://storage.googleapis.com/syzbot-assets/0a06ea295210/bzImage-591cd656.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+774863666ef5b025c9d0@syzkaller.appspotmail.com INFO: task syz.2.19:6128 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.19 state:D stack:27960 pid:6128 tgid:6125 ppid:5955 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5298 [inline] __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911 __schedule_loop kernel/sched/core.c:6993 [inline] schedule+0x164/0x360 kernel/sched/core.c:7008 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7065 __mutex_lock_common kernel/locking/mutex.c:692 [inline] __mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776 blk_debugfs_lock_nomemsave block/blk.h:740 [inline] blk_trace_startstop+0x8f/0x610 kernel/trace/blktrace.c:903 blk_trace_ioctl+0x314/0x920 kernel/trace/blktrace.c:949 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: 0033:0x7f7f6ab9c819 RSP: 002b:00007f7f6baad028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f7f6ae16090 RCX: 00007f7f6ab9c819 RDX: 0000000000000000 RSI: 0000000000001274 RDI: 0000000000000003 RBP: 00007f7f6ac32c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 --- 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.