From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f198.google.com (mail-il1-f198.google.com [209.85.166.198]) (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 4F88E204599 for ; Tue, 1 Apr 2025 14:04:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743516246; cv=none; b=W4jKkpEILrRHllgq+ShZZP5cTPJu2+SvBdlEEUXw2MDzI6uIF6OiNkIOSzNxd1816hkiGahxnUAoM2PWjSHpmUZHVioYeL4pBLJnCPFrP9OIOKahljhLAqCH9lMHp0cJPOgnB0ATzd2nX1UbpAoTFxGuRNbYdpRsaCkbTmPFA18= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743516246; c=relaxed/simple; bh=z4nr8CnbrNUM5EFxkX6/V/DzTFELbfFzRjYR0nXfFFI=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=V97UwmlSxPPi+XZspHnR15T+pWZ3NfwVzPd6ehvypH89a4XLzSyBe4Qa8KPlboiu0w3vG2yUGvzmzRcq4qDvgY6mMma1lRo3qJSonUFYhhk+R4WeX74hmJz1oikbn+ZyCNAOi+q2Eu1KinGRu0e07Z2YxEdS80g13u+65UF1ijA= 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=209.85.166.198 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-f198.google.com with SMTP id e9e14a558f8ab-3d43b460962so103164145ab.2 for ; Tue, 01 Apr 2025 07:04:04 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1743516243; x=1744121043; 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=GssAW77aLxDycK5b8HNXuQS6Lr9prUFD7O9XDkrRSSI=; b=KjoUX//9gvUxlR5+Xa2vy7Nx3rgoX9lBgANEh9RYJ15F+O5cKC0I+ogRnt5FjusOOZ xA8IVXzRD47ABszOA0LY1vsyy/U3p1HxQgLl8ZiDsgGr8Pc0jgj/FRLQ6fBU+EA6FzwO t+17xrafOBJ+ThD74DVnxmN5lJaBeDbZsxjqbe2UdSs1rjZQnuxuSWyr7tvSsMO6l4l3 td1gzMz8tL3+ZkEZRTRQGz3YmmaNshrI/gP6L7BTxVQRjSfdxHnBNoDCtVDk8mCYsdYn PiVvI7DxxF5z8LTT0PIj3IZQ+Dw78dBgXkxWJedawubnmFY3jAO6BYUTSyICDwWbtYWB I+jg== X-Forwarded-Encrypted: i=1; AJvYcCWp3GVH7hJSoypbEAM1OndTK2t/WiVN8IYRf6RGqfIZSXwtU1IqEzjzHRRj+9YwseKFCg8zvWfVy60Dn94=@vger.kernel.org X-Gm-Message-State: AOJu0YyixMavYT2Ck4fr1yVrrYQvVKUNp1eSVVc8jSZfgzaVNodbroe5 8kEJ90mKHZkaWWZbmo1P57tb+Pdq4iO3X4RCxuizMGcfE4HgIJx3ow8ewtj/pwQKGgksH3PmYED Gn0BvU86BRpVrxW5jYdS6CWbSNRAA76meis1+LqXpiomosorl+5Spv6g= X-Google-Smtp-Source: AGHT+IHJD+INJ3xRW5ZNkV0ZXLdmlZgcQ42zzTN6ny6jw5ah4GUkGZwkdYt+iJqRQs7+x3Ot/84E1ZnFP2YUnCMaJA2UPxhKT7WX Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:988:b0:3d6:cbc5:a102 with SMTP id e9e14a558f8ab-3d6cbc5a2ffmr18941325ab.13.1743516243444; Tue, 01 Apr 2025 07:04:03 -0700 (PDT) Date: Tue, 01 Apr 2025 07:04:03 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67ebf253.050a0220.3a8a08.001a.GAE@google.com> Subject: Re: [syzbot] [isdn4linux?] [nilfs?] INFO: task hung in mISDN_ioctl From: syzbot To: eadavis@qq.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: INFO: task hung in mISDN_ioctl INFO: task syz.2.18:6779 blocked for more than 143 seconds. Not tainted 6.14.0-rc6-syzkaller-00202-ga29967be967e-dirty #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.18 state:D stack:22848 pid:6779 tgid:6776 ppid:6458 task_flags:0x400140 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5378 [inline] __schedule+0x18bc/0x4c40 kernel/sched/core.c:6765 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6857 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914 __mutex_lock_common kernel/locking/mutex.c:662 [inline] __mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730 mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f192e98d169 RSP: 002b:00007f192f7e7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f192eba5fa0 RCX: 00007f192e98d169 RDX: 0000400000001f00 RSI: 0000000080044940 RDI: 0000000000000005 RBP: 00007f192ea0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f192eba5fa0 R15: 00007ffe22850c28 INFO: task syz.0.16:6793 blocked for more than 143 seconds. Not tainted 6.14.0-rc6-syzkaller-00202-ga29967be967e-dirty #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.16 state:D stack:23008 pid:6793 tgid:6792 ppid:6450 task_flags:0x400140 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5378 [inline] __schedule+0x18bc/0x4c40 kernel/sched/core.c:6765 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6857 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914 __mutex_lock_common kernel/locking/mutex.c:662 [inline] __mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730 mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbc5f38d169 RSP: 002b:00007fbc5e5fe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fbc5f5a5fa0 RCX: 00007fbc5f38d169 RDX: 0000400000001f00 RSI: 0000000080044940 RDI: 0000000000000005 RBP: 00007fbc5f40e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fbc5f5a5fa0 R15: 00007ffc6882ec98 INFO: task syz.4.20:6802 blocked for more than 144 seconds. Not tainted 6.14.0-rc6-syzkaller-00202-ga29967be967e-dirty #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.20 state:D stack:20592 pid:6802 tgid:6800 ppid:6465 task_flags:0x400140 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5378 [inline] __schedule+0x18bc/0x4c40 kernel/sched/core.c:6765 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6857 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914 __mutex_lock_common kernel/locking/mutex.c:662 [inline] __mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730 mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f358ef8d169 RSP: 002b:00007f358fdaf038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f358f1a5fa0 RCX: 00007f358ef8d169 RDX: 0000400000001f00 RSI: 0000000080044940 RDI: 0000000000000005 RBP: 00007f358f00e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f358f1a5fa0 R15: 00007ffd52b36ed8 INFO: task syz.3.19:6811 blocked for more than 144 seconds. Not tainted 6.14.0-rc6-syzkaller-00202-ga29967be967e-dirty #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.19 state:D stack:22848 pid:6811 tgid:6810 ppid:6467 task_flags:0x400140 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5378 [inline] __schedule+0x18bc/0x4c40 kernel/sched/core.c:6765 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6857 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914 __mutex_lock_common kernel/locking/mutex.c:662 [inline] __mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730 mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f01c9f8d169 RSP: 002b:00007f01c91fe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f01ca1a5fa0 RCX: 00007f01c9f8d169 RDX: 0000400000001f00 RSI: 0000000080044940 RDI: 0000000000000005 RBP: 00007f01ca00e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f01ca1a5fa0 R15: 00007ffe266db8c8 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746 3 locks held by kworker/u8:2/36: #0: ffff888030a72948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff888030a72948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3319 #1: ffffc90000ac7c60 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc90000ac7c60 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3319 #2: ffff8880b863e7d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598 2 locks held by kworker/u8:6/1157: 2 locks held by getty/5577: #0: ffff88814d40f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000330b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x616/0x1770 drivers/tty/n_tty.c:2211 3 locks held by kworker/0:3/5931: #0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3319 #1: ffffc90003887c60 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc90003887c60 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3319 #2: ffff88802a029240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x314/0x3f00 drivers/net/netdevsim/fib.c:1490 3 locks held by kworker/0:4/5932: #0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3319 #1: ffffc90003877c60 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc90003877c60 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3319 #2: ffff888050ffb240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x314/0x3f00 drivers/net/netdevsim/fib.c:1490 1 lock held by syz.1.17/6732: 1 lock held by syz.2.18/6779: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.0.16/6793: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.4.20/6802: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.3.19/6811: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.5.21/6885: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.6.22/6948: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.7.23/6954: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.9.25/6957: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.8.24/6960: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.1.26/6979: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.2.27/7029: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.0.28/7049: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.3.29/7058: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.4.30/7061: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.5.31/7074: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.6.32/7107: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.7.33/7156: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.8.34/7167: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.9.35/7178: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.1.36/7186: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.2.37/7198: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.0.38/7220: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.3.39/7249: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.4.40/7285: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.5.41/7301: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.6.42/7316: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.7.43/7338: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.8.44/7360: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.9.45/7392: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz-executor/7397: #0: ffffffff8fec3b48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:129 [inline] #0: ffffffff8fec3b48 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x47e/0x1bc0 net/ipv4/devinet.c:987 1 lock held by syz.1.46/7405: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 3 locks held by syz-executor/7416: #0: ffffffff8f664c80 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8f664c80 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8f664c80 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x22/0x250 net/core/rtnetlink.c:564 #1: ffffffff8fec3b48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #1: ffffffff8fec3b48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:335 [inline] #1: ffffffff8fec3b48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xc55/0x1d30 net/core/rtnetlink.c:4021 #2: ffffffff8eb3e8b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:302 [inline] #2: ffffffff8eb3e8b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x381/0x820 kernel/rcu/tree_exp.h:996 1 lock held by syz.2.47/7430: #0: ffffffff8fbf9fe8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x96/0x840 drivers/isdn/mISDN/timerdev.c:226 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-rc6-syzkaller-00202-ga29967be967e-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline] watchdog+0x1058/0x10a0 kernel/hung_task.c:399 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6732 Comm: syz.1.17 Not tainted 6.14.0-rc6-syzkaller-00202-ga29967be967e-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:pte_same arch/x86/include/asm/pgtable.h:999 [inline] RIP: 0010:handle_pte_fault mm/memory.c:5917 [inline] RIP: 0010:__handle_mm_fault+0x15ca/0x70f0 mm/memory.c:6050 Code: 40 01 00 00 48 89 f8 48 c1 e8 03 42 80 3c 28 00 74 05 e8 59 98 18 00 48 89 9c 24 40 01 00 00 48 89 df 4c 89 e6 e8 06 db b3 ff <4c> 39 e3 0f 85 76 48 00 00 48 8b 44 24 78 42 0f b6 04 28 84 c0 0f RSP: 0018:ffffc900037e7880 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 80000000760d4825 RCX: ffff88802e7b0000 RDX: dffffc0000000000 RSI: 80000000760d4825 RDI: 80000000760d4825 RBP: ffffc900037e7cd0 R08: ffffffff820e06ca R09: fffff520006fcf00 R10: dffffc0000000000 R11: fffff520006fcf00 R12: 80000000760d4825 R13: dffffc0000000000 R14: ffffc900037e7c40 R15: ffffc900037e7be0 FS: 00007fca175306c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000400000001f00 CR3: 0000000032fb8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: handle_mm_fault+0x2c1/0x7e0 mm/memory.c:6219 do_user_addr_fault arch/x86/mm/fault.c:1388 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x2b9/0x8b0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:mISDN_ioctl+0x6b4/0x840 drivers/isdn/mISDN/timerdev.c:246 Code: ed f8 85 ed 78 34 48 bb 00 f0 ff ff ff 7f 00 00 48 89 df 4c 89 e6 e8 6b 07 ed f8 4c 39 e3 0f 82 82 00 00 00 0f 01 cb 0f ae e8 <41> 89 2c 24 e8 f3 04 ed f8 0f 01 ca 31 db eb 08 e8 e7 04 ed f8 48 RSP: 0018:ffffc900037e7e70 EFLAGS: 00050206 RAX: 0000000000000000 RBX: 00007ffffffff000 RCX: ffff88802e7b0000 RDX: ffff88802e7b0000 RSI: 0000400000001f00 RDI: 00007ffffffff000 RBP: 0000000000000000 R08: ffffffff88d4da65 R09: 1ffffffff28a2d2a R10: dffffc0000000000 R11: fffffbfff28a2d2b R12: 0000400000001f00 R13: ffff888024cf3428 R14: dffffc0000000000 R15: 0000000000000000 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fca1678d169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fca17530038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fca169a5fa0 RCX: 00007fca1678d169 RDX: 0000400000001f00 RSI: 0000000080044940 RDI: 0000000000000005 RBP: 00007fca1680e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fca169a5fa0 R15: 00007ffdfe8c1d78 Tested on: commit: a29967be Merge tag 'v6.14-rc6-smb3-client-fixes' of gi.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=12a59c3f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=67fb5d057adc2bbe dashboard link: https://syzkaller.appspot.com/bug?extid=5d83cecd003a369a9965 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=15f57bcf980000