From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f208.google.com (mail-il1-f208.google.com [209.85.166.208]) (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 BB6A8340DA0 for ; Tue, 2 Sep 2025 17:24:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756833873; cv=none; b=EEVc9E/XE0h2QDHwtgBbIU/SIClxWGkUebYwmWqCsvQX8hVUhPCQ5Ev4kLM7FJA6C2BUz/GCwfIp1x2PZwEHf3dt1r+ZL9YArh/uoSVZCMIj+cg5hNLOs796j4NOFGd7nIzWuEmYnYHnreX7ZxTWvqN1nEM+u3XYWnl3eNV0QYw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756833873; c=relaxed/simple; bh=1ZZqFbNw/49Gug/s2W/vtYY7n2F4KFxPrpOt6Bf1xyw=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=Qjx19KEf4Iyp+2XNmqP6QciuF2Lo1yL/PqoFLIfVQsiu5lvUEfqJUm2fe/L+jHHnUq5MCQ9mtpvI3y3jsbRqshO4gGdWXdLtALriO3UEjUpJScjN+p++c/kdWo7RqKoJSv0Gm3A3Dh90514AQP5lbHv6NiiyQNqECQTOBEdNdwg= 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=209.85.166.208 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-il1-f208.google.com with SMTP id e9e14a558f8ab-3f1ebcf0863so65279825ab.2 for ; Tue, 02 Sep 2025 10:24:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1756833871; x=1757438671; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=lPP45SA+l96CUh2c18VDkNcHfjDugr+GGGq2m1pNyw0=; b=So39asL1vYMSWz8L+byKgZ7q5i9xJxaRdNYXTUkNyqx9BVvKPhI0DWQ27GhubL/AMA SBzCk/8g7WCtfnN82+MWQlMpHofbPSlhGPFY/Nxg1hJdIpQrk3MyApDAr3oUkZKuMWjb 6nK2pQAUixKh15zUWPWDoX2DpLrmNOrux4SH+I40DQVv7TpGk4KNN45fmWfBsxG+HMKb Nhs4Q82a/1us46+QSIwxj1rW8PJsCIFWSrIL9q7ahDuFY9FhDsRBZSKoITGluuExPJ/D 8tGl/pOB2sjv4qUmG6IXGlyLxI5Qv8CSAQN9rj4TQM9AeFFDbCIZ9E5heNUQH7wBKbxo ykMA== X-Forwarded-Encrypted: i=1; AJvYcCV1T12kRjkCq46WETjM8xxXajp1qkrnK/Rjl3EBfDlpIILiIDTx7kiRETxP5lNYXtQn1g0c9LjGwsQZ@vger.kernel.org X-Gm-Message-State: AOJu0Yz9OBk6lqL96Bwf5+SmsKXmBKO/oSf32XgK1GI2clO8PuCFSHOO LQel6/Q9gVUYbG8HnX4HcnNyvTSXCxRiydFXZmt+fvpBSxrjMkCWxu9HsJ0DpCgBZMYOuq/Z7wq SrsCKYy+BbeWXE8ETj0DawAkvJnqVqo8KjlvTqwa6AXqopgw9CsMCCtrp3oM= X-Google-Smtp-Source: AGHT+IFV5H1Fgh3t9Ch95MsLrxeQgVcDnvnLwFQWyFLZD+7A55UCkqpzNbOb/0bAc/B3lUb9xV7mDA4YWg1dL71pPqMCIJdrXAkJ Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:19c8:b0:3f0:ac23:ea93 with SMTP id e9e14a558f8ab-3f4026c2863mr250677045ab.29.1756833870850; Tue, 02 Sep 2025 10:24:30 -0700 (PDT) Date: Tue, 02 Sep 2025 10:24:30 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68b7284e.050a0220.3db4df.01d6.GAE@google.com> Subject: [syzbot] [ext4?] INFO: task hung in ext4_read_bh From: syzbot To: adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tytso@mit.edu Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 7fa4d8dc380f Add linux-next specific files for 20250821 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=16a46662580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ae76068823a236b3 dashboard link: https://syzkaller.appspot.com/bug?extid=18edb60ce92acd5b4674 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11a46662580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1399da62580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/63178c6ef3f8/disk-7fa4d8dc.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c5c27b0841e0/vmlinux-7fa4d8dc.xz kernel image: https://storage.googleapis.com/syzbot-assets/9a8832715cca/bzImage-7fa4d8dc.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+18edb60ce92acd5b4674@syzkaller.appspotmail.com INFO: task syz.0.17:6042 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.17 state:D stack:24456 pid:6042 tgid:6042 ppid:5993 task_flags:0x400140 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0x165/0x360 kernel/sched/core.c:7058 io_schedule+0x80/0xd0 kernel/sched/core.c:7903 bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250 __wait_on_bit+0xb6/0x310 kernel/sched/wait_bit.c:52 out_of_line_wait_on_bit+0x123/0x170 kernel/sched/wait_bit.c:67 wait_on_buffer include/linux/buffer_head.h:420 [inline] ext4_read_bh+0x20d/0x260 fs/ext4/super.c:207 ext4_read_bh_lock fs/ext4/super.c:220 [inline] __ext4_sb_bread_gfp+0x1c9/0x210 fs/ext4/super.c:242 ext4_sb_bread_unmovable fs/ext4/super.c:265 [inline] ext4_load_super fs/ext4/super.c:5063 [inline] __ext4_fill_super fs/ext4/super.c:5267 [inline] ext4_fill_super+0x802/0x6090 fs/ext4/super.c:5728 get_tree_bdev_flags+0x40b/0x4d0 fs/super.c:1692 vfs_get_tree+0x8f/0x2b0 fs/super.c:1752 do_new_mount+0x2a2/0xa30 fs/namespace.c:3810 do_mount fs/namespace.c:4138 [inline] __do_sys_mount fs/namespace.c:4349 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4326 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f733498ebe9 RSP: 002b:00007ffe0adbf068 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f7334bc5fa0 RCX: 00007f733498ebe9 RDX: 0000200000000000 RSI: 0000200000000040 RDI: 0000200000000100 RBP: 00007f7334a11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000200000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7334bc5fa0 R14: 00007f7334bc5fa0 R15: 0000000000000005 INFO: lockdep is turned off. NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline] watchdog+0xf60/0xfa0 kernel/hung_task.c:495 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x47c/0x820 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82 Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 83 0f 22 00 f3 0f 1e fa fb f4 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90000197de0 EFLAGS: 000002c2 RAX: a34074f8f13bed00 RBX: ffffffff8197ac78 RCX: a34074f8f13bed00 RDX: 0000000000000001 RSI: ffffffff8c04e5e0 RDI: ffffffff8197ac78 RBP: ffffc90000197f10 R08: ffff8880b8732f9b R09: 1ffff110170e65f3 R10: dffffc0000000000 R11: ffffed10170e65f4 R12: ffffffff8fe52d30 R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff11003a55b40 FS: 0000000000000000(0000) GS:ffff8881258c4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056389163e5d0 CR3: 00000000754ec000 CR4: 00000000003526f0 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline] default_idle+0x13/0x20 arch/x86/kernel/process.c:757 default_idle_call+0x74/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:190 [inline] do_idle+0x1e8/0x510 kernel/sched/idle.c:330 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:428 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:315 common_startup_64+0x13e/0x147 --- 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 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. 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