From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f77.google.com (mail-oa1-f77.google.com [209.85.160.77]) (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 AB17B477E31 for ; Fri, 29 May 2026 18:45:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780080333; cv=none; b=TtkHn6QH939NrEG4FwLyIptpcB0b/gNIk/agMgUDqmUl13B+0uLZUB94CRaxou1Nh2BomiE5W6RLMBgYX+jTElZNSG9CMpxK8KLl494gdxmh9UpXzTKqWCfXyEQhKSr6eJbIEtMZ6k+kWvwpC/bNQjzXi6crg2iKXfz+gfycCLo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780080333; c=relaxed/simple; bh=5I9wXV22g/gOe+oltPCQcin3JHKRIODrFpN3GmD90Bs=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=dLahpJfByav5X0U9TTZTCjuES3kOelLrmJjYKM4+W0OFLDKlrZ43eZv46s/xXg7zPNwnGx+2M5CsOdOVcDvR2aqNpjGjiTcZCRqgmC8HkEC0rvAqP3UwX77R8tPtVx78OobokJGHTmi6VqA2THwLs4FcAcc2X/XjvVnGTHDvjrQ= 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=209.85.160.77 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-oa1-f77.google.com with SMTP id 586e51a60fabf-43979464ce8so27468149fac.2 for ; Fri, 29 May 2026 11:45:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1780080328; x=1780685128; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=8R5XJNlPg1mMSty+9TsIX3QunIvIlrdT9LjLPHCnWto=; b=cD6PQrGXm3cZ2UOsDMbVDMk/5+HhgWvW2H8Uk3u1vPHGiU00llm7JmNx1tRX2LJJer M807C8Ke4Bt+bIM5fTTqVg/yosN9tJKTY40AoTf8Lrl4k9+tm7jbva1jLJ7q4dVh+WYg opD4T/vQHIkCQKqfBY9XQMdNHn69tdLhIYBcG0fuSLMA6q1bRVU76NLGcjYSiDChYunK kQgIWb7/3+Xpq/yulBm3kigbSumStsBy9AMdrg3QL1OYyaeoEaEGUr10DTWj+EIXNH2N +8wD42yffBnXfRP9uI0/4CgwLBYekcNhvApAgP+nusGwlv5OwABTIpL7GA9xMLS/GFJg i4Rg== X-Forwarded-Encrypted: i=1; AFNElJ/6PEAX9uIoa+HaR14qYJ/nu07BeWNrVYCsG2d4gd8g8Ib0QlyN5QSQdkWYXPM+tmU5PzcKSMeHQqLr+K0=@vger.kernel.org X-Gm-Message-State: AOJu0YydgX2ZIv5fQjEWyDBkOTS5kVpRABpvXmTz9i/NgMevbjLDx8On /E8vi4bgViuDsvwJT72AA9YbbQDjYGi4Hj8fvSxyZx6pxo+GjomwH4zQmsx8vs6kZxAkOFmAQqB mKlqVDHGv6x+PEzubfmASly/dcuYThUClf2bob6z4sLr+zv0WTA3lhIe+yYc= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:8186:b0:69d:9190:a818 with SMTP id 006d021491bc7-69e103c1882mr272472eaf.32.1780080328425; Fri, 29 May 2026 11:45:28 -0700 (PDT) Date: Fri, 29 May 2026 11:45:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a19dec8.b111c304.35cd64.0013.GAE@google.com> Subject: [syzbot] [kernel?] INFO: task hung in vcs_open (10) From: syzbot To: anna-maria@linutronix.de, frederic@kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: e7ae89a0c97c Linux 7.1-rc5 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11d8c62e580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e327ee9a867dd6b9 dashboard link: https://syzkaller.appspot.com/bug?extid=99897fb26901360e1e8e compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/bbe0fa53b9f3/disk-e7ae89a0.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8a6e244da62c/vmlinux-e7ae89a0.xz kernel image: https://storage.googleapis.com/syzbot-assets/eb16b1c79be7/bzImage-e7ae89a0.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+99897fb26901360e1e8e@syzkaller.appspotmail.com INFO: task syz.9.2438:15503 blocked for more than 143 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.9.2438 state:D stack:26792 pid:15503 tgid:15501 ppid:14199 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5388 [inline] __schedule+0x1295/0x67a0 kernel/sched/core.c:7189 __schedule_loop kernel/sched/core.c:7268 [inline] schedule+0xdd/0x390 kernel/sched/core.c:7283 schedule_timeout+0x1b2/0x280 kernel/time/sleep_timeout.c:75 ___down_common kernel/locking/semaphore.c:289 [inline] __down_common+0x371/0x8a0 kernel/locking/semaphore.c:314 down+0x74/0xa0 kernel/locking/semaphore.c:100 console_lock+0x5b/0xa0 kernel/printk/printk.c:2896 class_console_lock_constructor include/linux/console.h:736 [inline] vcs_open+0x64/0xc0 drivers/tty/vt/vc_screen.c:746 chrdev_open+0x234/0x6a0 fs/char_dev.c:411 do_dentry_open+0x6d8/0x1660 fs/open.c:947 vfs_open+0x82/0x3f0 fs/open.c:1079 do_open fs/namei.c:4699 [inline] path_openat+0x208c/0x31a0 fs/namei.c:4858 do_file_open+0x20e/0x430 fs/namei.c:4887 do_sys_openat2+0x10d/0x1e0 fs/open.c:1364 do_sys_open fs/open.c:1370 [inline] __do_sys_openat fs/open.c:1386 [inline] __se_sys_openat fs/open.c:1381 [inline] __x64_sys_openat+0x12d/0x210 fs/open.c:1381 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0x860 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa79339ce59 RSP: 002b:00007fa794264028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fa793615fa0 RCX: 00007fa79339ce59 RDX: 0000000000000040 RSI: 0000200000000100 RDI: ffffffffffffff9c RBP: 00007fa793432d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa793616038 R14: 00007fa793615fa0 R15: 00007ffefb5dd5d8 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e7e5620 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffffffff8e7e5620 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #0: ffffffff8e7e5620 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775 2 locks held by getty/5365: #0: ffff888039d210a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900032332e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x14f0 drivers/tty/n_tty.c:2211 2 locks held by kworker/0:7/5804: 6 locks held by syz.2.1808/12584: 4 locks held by syz-executor/16651: 2 locks held by syz.6.2786/17075: #0: ffffffff8f5023c0 (tty_mutex){+.+.}-{4:4}, at: tty_open_by_driver drivers/tty/tty_io.c:2037 [inline] #0: ffffffff8f5023c0 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x539/0xfa0 drivers/tty/tty_io.c:2120 #1: ffff8880261a61b0 (&tty->legacy_mutex){+.+.}-{4:4}, at: tty_init_dev.part.0+0x39/0x470 drivers/tty/tty_io.c:1406 1 lock held by syz.2.2827/17451: #0: ffffffff8f5023c0 (tty_mutex){+.+.}-{4:4}, at: tty_open_by_driver drivers/tty/tty_io.c:2037 [inline] #0: ffffffff8f5023c0 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x539/0xfa0 drivers/tty/tty_io.c:2120 1 lock held by syz.1.2888/17504: 1 lock held by syz.7.2903/17552: 1 lock held by syz.8.2907/17560: #0: ffff88807e610dc8 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: ima_check_last_writer security/integrity/ima/ima_main.c:215 [inline] #0: ffff88807e610dc8 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: ima_file_free+0x146/0x340 security/integrity/ima/ima_main.c:251 1 lock held by syz.8.2907/17566: ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x1d7/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] __sys_info lib/sys_info.c:157 [inline] sys_info+0x141/0x190 lib/sys_info.c:165 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline] watchdog+0xcb1/0x1030 kernel/hung_task.c:561 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 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 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63 Code: 56 92 02 c3 cc cc cc cc 0f 1f 00 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 43 41 20 00 fb f4 7c 42 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 RSP: 0018:ffffc90000197df0 EFLAGS: 00000246 RAX: 0000000005d0e9e7 RBX: ffff88801e2ca500 RCX: ffffffff8b8b50b5 RDX: 0000000000000000 RSI: ffffffff8df24460 RDI: ffffffff8c1c4500 RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed10170a67b5 R10: ffff8880b8533dab R11: 0000000000000000 R12: 0000000000000001 R13: ffffed1003c594a0 R14: 0000000000000001 R15: ffffffff90d7e950 FS: 0000000000000000(0000) GS:ffff88812446a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc8e89456b8 CR3: 0000000043fd1000 CR4: 00000000003526f0 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline] default_idle+0x9/0x10 arch/x86/kernel/process.c:767 default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:199 [inline] do_idle+0x464/0x590 kernel/sched/idle.c:352 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:451 start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312 common_startup_64+0x13e/0x148 --- 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