From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f72.google.com (mail-oo1-f72.google.com [209.85.161.72]) (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 A61663A8F7 for ; Sat, 3 Jan 2026 14:33:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.72 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767450785; cv=none; b=ixkkJPKDm0YNMxwMDj2J6kcUUHOpXBh8DXyigUPoQkASQ+ewAEJPEw0a04l8sZOfIRhFdRwyhTneleJm0gaIsSsPRUI9lpPN1xAVgFOdcs77Jxm00clQ38uiZc0k/qfxz+6iwL3tJSV5pqT0x6Qc80g2bb0BtEK41LOGg3JU/Ak= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767450785; c=relaxed/simple; bh=EYgcc8JcVeVVmBY9913jxoSHOJ2vJ5B2/rDhyym4WdU=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=G/JQHbHHgzE0yXB1/71AvMOKBY7ktfzDgtKgWtwlWx2+nuKUUzNgoRc/e4rq897elIRS1a6wNWPScqGZQDsJoXN98MiIufvgB/KIeAOi5hLqvfCPcaaFKJGSVZpFj5jmvCV/iFl1Yue4tWkwucT/brHM+mgAuhHWaudPcGBAfkI= 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=209.85.161.72 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-oo1-f72.google.com with SMTP id 006d021491bc7-65cfea2cedeso14059744eaf.0 for ; Sat, 03 Jan 2026 06:33:03 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767450782; x=1768055582; 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=Vi0UDBfNkIlOCaWPuzbJSEdiE3dDhaiXUjFUpyWZDeg=; b=MIyVttOhJoXEthMEHhzdmDP20wYLyzOjSI5nv3Z8//UbuQxA42SCLyMDGSzT+FIo+g yIT1jZAik6GTJTUHrWTyajxR3W528gb8oYjxnDduuPMWOvrUSxqHSJjW1/TdZYDlqDFe JqZuJQtXhqgnbPcxUfKW87RAEMg5aU/1yuaFONAMzixTvbUGIqQ0iOXiTptK4RmtVkgO QGaXVEX/W//Gm3pH7kPx9Q6E4kvoKd9vXmOM3CtXMyrg0tgLadxsPaa+BFns84rjFqqU l3YMF9E0qRSzIq0hVsE9UxcjuRZftCg0NxH1JkHISagHU5sg1g4gTlknrZ0GpcDgIsb8 neFg== X-Gm-Message-State: AOJu0Yz7TA+pXy7S1Cm4u7sMjqYr8xUdE2eieCMI37737FU9KwMki9Jl aNqotMJRXZWeJgWoxwoD6I8cB1Shfpof3fD7U+whMySyqjRbnZqc9LDN074x9Wzj7oxjW5ELi9C A2U0Yq3P0cNeT+nP5DwDoHyOD+ZCnaspAUk4a3NHDgBv9oY1/HLNG1Kv0S3M= X-Google-Smtp-Source: AGHT+IFENo1hJ06fdADuAiZNBSI+pKgxbNJMPLB0jtuiJx07kMmZhBV501O1D7s3et+xc9UnLVzoYGdoOwtcivpX/p5147qW6aU4 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:22a6:b0:65c:f821:9dc1 with SMTP id 006d021491bc7-65d0ea13fbbmr19386054eaf.34.1767450782572; Sat, 03 Jan 2026 06:33:02 -0800 (PST) Date: Sat, 03 Jan 2026 06:33:02 -0800 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6959289e.050a0220.1c9965.000d.GAE@google.com> Subject: Re: [syzbot] [net?] INFO: task hung in new_device_store (5) From: syzbot To: linux-kernel@vger.kernel.org, penguin-kernel@i-love.sakura.ne.jp, 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 del_device_store INFO: task syz-executor:7083 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:7083 tgid:7083 ppid:1 task_flags:0x400140 flags:0x00000001 Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1250/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 del_device_store+0xd4/0x31c drivers/net/netdevsim/bus.c:234 bus_attr_store+0x80/0xa4 drivers/base/bus.c:172 sysfs_kf_write+0x1a8/0x23c fs/sysfs/file.c:142 kernfs_fop_write_iter+0x33c/0x4d0 fs/kernfs/file.c:352 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x540/0xa3c fs/read_write.c:686 ksys_write+0x120/0x210 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:746 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 INFO: task syz-executor:7088 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:7088 tgid:7088 ppid:1 task_flags:0x400140 flags:0x00000011 Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1250/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 device_lock include/linux/device.h:895 [inline] device_del+0xa4/0x808 drivers/base/core.c:3840 device_unregister+0x2c/0xf4 drivers/base/core.c:3919 nsim_bus_dev_del drivers/net/netdevsim/bus.c:483 [inline] del_device_store+0x27c/0x31c drivers/net/netdevsim/bus.c:244 bus_attr_store+0x80/0xa4 drivers/base/bus.c:172 sysfs_kf_write+0x1a8/0x23c fs/sysfs/file.c:142 kernfs_fop_write_iter+0x33c/0x4d0 fs/kernfs/file.c:352 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x540/0xa3c fs/read_write.c:686 ksys_write+0x120/0x210 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:746 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 INFO: task syz-executor:7095 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:7095 tgid:7095 ppid:1 task_flags:0x400140 flags:0x00000001 Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1250/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 new_device_store+0x128/0x594 drivers/net/netdevsim/bus.c:184 bus_attr_store+0x80/0xa4 drivers/base/bus.c:172 sysfs_kf_write+0x1a8/0x23c fs/sysfs/file.c:142 kernfs_fop_write_iter+0x33c/0x4d0 fs/kernfs/file.c:352 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x540/0xa3c fs/read_write.c:686 ksys_write+0x120/0x210 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:746 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 INFO: task syz-executor:7096 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:7096 tgid:7096 ppid:7091 task_flags:0x400140 flags:0x00000000 Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1250/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 new_device_store+0x128/0x594 drivers/net/netdevsim/bus.c:184 bus_attr_store+0x80/0xa4 drivers/base/bus.c:172 sysfs_kf_write+0x1a8/0x23c fs/sysfs/file.c:142 kernfs_fop_write_iter+0x33c/0x4d0 fs/kernfs/file.c:352 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x540/0xa3c fs/read_write.c:686 ksys_write+0x120/0x210 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:746 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Showing all locks held in the system: 1 lock held by khungtaskd/32: #0: ffff80008fa5b5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 6 locks held by kworker/u8:3/42: #0: ffff0000c1843148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff800097ff7be0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff800092ad78d0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf0/0x638 net/core/net_namespace.c:670 #3: ffff0000c6a3a0e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline] #3: ffff0000c6a3a0e8 (&dev->mutex){....}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:108 [inline] #3: ffff0000c6a3a0e8 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0xe4/0x380 net/devlink/core.c:506 #4: ffff0000ca7e8250 (&devlink->lock_key#3){+.+.}-{4:4}, at: devl_lock net/devlink/core.c:276 [inline] #4: ffff0000ca7e8250 (&devlink->lock_key#3){+.+.}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:109 [inline] #4: ffff0000ca7e8250 (&devlink->lock_key#3){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0xf0/0x380 net/devlink/core.c:506 #5: ffff800092ae4828 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 1 lock held by pr/ttyAMA-1/43: #0: ffff80008f938118 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire+0x10/0x4c include/linux/rcupdate.h:335 3 locks held by kworker/u8:7/386: #0: ffff0000c0031948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff80009cac7be0 ((work_completion)(&rdev->wiphy_work)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff0000cb4f8788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6363 [inline] #2: ffff0000cb4f8788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: cfg80211_wiphy_work+0xd4/0x49c net/wireless/core.c:424 9 locks held by kworker/u8:11/2068: #0: ffff0000c0031948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff8000a1357be0 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff0000d78ca250 (&devlink->lock_key#4){+.+.}-{4:4}, at: devl_trylock+0x24/0x34 net/devlink/core.c:282 #3: ffff0000c73598e0 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] #3: ffff0000c73598e0 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: nsim_dev_trap_report drivers/net/netdevsim/dev.c:861 [inline] #3: ffff0000c73598e0 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: nsim_dev_trap_report_work+0x16c/0x9fc drivers/net/netdevsim/dev.c:921 #4: ffff80008fa5b5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x18/0x54 include/linux/rcupdate.h:330 #5: ffff80008fa5b5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x18/0x54 include/linux/rcupdate.h:330 #6: ffff80008fa5b5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:330 #7: ffff80008fa5b660 (rcu_read_lock_sched){....}-{1:2}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 #8: ffff80008fa5b5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:330 3 locks held by kworker/u8:13/2738: #0: ffff0000c0031948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff8000a2f87be0 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff0000c3603250 (&devlink->lock_key#2){+.+.}-{4:4}, at: devl_trylock+0x24/0x34 net/devlink/core.c:282 2 locks held by kworker/u8:20/4091: #0: ffff0000d43e3148 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff80009ee87be0 ((work_completion)(&(&bat_priv->tt.work)->work)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 3 locks held by kworker/u8:23/5227: #0: ffff0000d540d148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff80009e117be0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff800092ae4828 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 1 lock held by udevd/6215: #0: ffff80008fa5b5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:330 2 locks held by getty/6358: #0: ffff0000cd79f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff8000993c42f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfc8 drivers/tty/n_tty.c:2211 4 locks held by syz-executor/7083: #0: ffff0000dbb04420 (sb_writers#6){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2681 [inline] #0: ffff0000dbb04420 (sb_writers#6){.+.+}-{0:0}, at: vfs_write+0x24c/0xa3c fs/read_write.c:682 #1: ffff0000c35a5488 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1b4/0x4d0 fs/kernfs/file.c:343 #2: ffff0000cde211e8 (kn->active#55){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline] #2: ffff0000cde211e8 (kn->active#55){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1f4/0x4d0 fs/kernfs/file.c:344 #3: ffff800091bf3b68 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd4/0x31c drivers/net/netdevsim/bus.c:234 5 locks held by syz-executor/7088: #0: ffff0000dbb04420 (sb_writers#6){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2681 [inline] #0: ffff0000dbb04420 (sb_writers#6){.+.+}-{0:0}, at: vfs_write+0x24c/0xa3c fs/read_write.c:682 #1: ffff0000c2d98c88 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1b4/0x4d0 fs/kernfs/file.c:343 #2: ffff0000cde211e8 (kn->active#55){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline] #2: ffff0000cde211e8 (kn->active#55){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1f4/0x4d0 fs/kernfs/file.c:344 #3: ffff800091bf3b68 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd4/0x31c drivers/net/netdevsim/bus.c:234 #4: ffff0000c6a3a0e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline] #4: ffff0000c6a3a0e8 (&dev->mutex){....}-{4:4}, at: device_del+0xa4/0x808 drivers/base/core.c:3840 4 locks held by syz-executor/7095: #0: ffff0000dbb04420 (sb_writers#6){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2681 [inline] #0: ffff0000dbb04420 (sb_writers#6){.+.+}-{0:0}, at: vfs_write+0x24c/0xa3c fs/read_write.c:682 #1: ffff0000df76c088 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1b4/0x4d0 fs/kernfs/file.c:343 #2: ffff0000cde210f8 (kn->active#56){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline] #2: ffff0000cde210f8 (kn->active#56){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1f4/0x4d0 fs/kernfs/file.c:344 #3: ffff800091bf3b68 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: new_device_store+0x128/0x594 drivers/net/netdevsim/bus.c:184 4 locks held by syz-executor/7096: #0: ffff0000dbb04420 (sb_writers#6){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2681 [inline] #0: ffff0000dbb04420 (sb_writers#6){.+.+}-{0:0}, at: vfs_write+0x24c/0xa3c fs/read_write.c:682 #1: ffff0000dfab0c88 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1b4/0x4d0 fs/kernfs/file.c:343 #2: ffff0000cde210f8 (kn->active#56){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline] #2: ffff0000cde210f8 (kn->active#56){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1f4/0x4d0 fs/kernfs/file.c:344 #3: ffff800091bf3b68 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: new_device_store+0x128/0x594 drivers/net/netdevsim/bus.c:184 4 locks held by kworker/1:7/7225: #0: ffff0000c0029948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff80009f6f7be0 (reg_work){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff800092ae4828 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 #3: ffff0000cb4f8788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6363 [inline] #3: ffff0000cb4f8788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_process_self_managed_hints+0x98/0x1dc net/wireless/reg.c:3179 2 locks held by udevd/7232: #0: ffff8000901037f8 (tomoyo_ss){.+.+}-{0:0}, at: srcu_lock_acquire+0x10/0x4c include/linux/srcu.h:184 #1: ffff80008fb6f890 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_lock_acquire+0x4/0x48 include/linux/srcu.h:184 5 locks held by syz-executor/7235: #0: ffff0000db9fc420 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:499 #1: ffff0000e10aedc0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1072 [inline] #1: ffff0000e10aedc0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2864 [inline] #1: ffff0000e10aedc0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2875 [inline] #1: ffff0000e10aedc0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1a4/0x2d8 fs/namei.c:4879 #2: ffff0000dba40950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xe4c/0x10dc fs/jbd2/transaction.c:442 #3: ffff0000e57a0270 (&ei->i_data_sem){++++}-{4:4}, at: ext4_map_blocks+0x3ec/0x1548 fs/ext4/inode.c:777 #4: ffff80008fb6f890 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_lock_acquire+0x4/0x48 include/linux/srcu.h:184 3 locks held by syz-executor/7236: #0: ffff0000c260a118 (&data->open_mutex){+.+.}-{4:4}, at: vhci_create_device+0x3c/0x634 drivers/bluetooth/hci_vhci.c:478 #1: ffff80008f901d08 (wq_pool_mutex){+.+.}-{4:4}, at: apply_wqattrs_lock kernel/workqueue.c:5215 [inline] #1: ffff80008f901d08 (wq_pool_mutex){+.+.}-{4:4}, at: __alloc_workqueue+0x7b4/0x16d8 kernel/workqueue.c:5768 #2: ffff80008fb6f890 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_lock_acquire+0x4/0x48 include/linux/srcu.h:184 2 locks held by syz-executor/7239: #0: ffff0000d6c52280 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:353 [inline] #0: ffff0000d6c52280 (&mm->mmap_lock){++++}-{4:4}, at: create_init_stack_vma+0xa0/0x56c mm/vma_exec.c:119 #1: ffff80008fb6f890 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_lock_acquire+0x4/0x48 include/linux/srcu.h:184 1 lock held by dhcpcd/7240: #0: ffff80008fb6f890 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_lock_acquire+0x4/0x48 include/linux/srcu.h:184 1 lock held by syz-executor/7241: #0: ffff80008fb6f890 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_lock_acquire+0x4/0x48 include/linux/srcu.h:184 ============================================= Tested on: commit: 805f9a06 Merge tag 'perf-tools-fixes-for-v6.19-2026-01.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1650e69a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8a8594efdc14f07a dashboard link: https://syzkaller.appspot.com/bug?extid=05f9cecd28e356241aba compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 userspace arch: arm64 patch: https://syzkaller.appspot.com/x/patch.diff?x=1180e69a580000