INFO: task hung in do_new

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision
4f5c4867	assessment-security	DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ✅ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	INFO: task hung in do_new_mount (4)	2026/07/01 00:23	2026/07/01 00:23	2026/07/01 00:47	93f57954

Title	Replies (including bot)	Last reply
[syzbot] [fuse?] [ext4?] INFO: task hung in do_new_mount (4)	0 (1)	2026/09/21 15:54

Title

Replies (including bot)

Last reply

[syzbot] [fuse?] [ext4?] INFO: task hung in do_new_mount (4)

0 (1)

2026/09/21 15:54

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: task hung in do_new_mount (3) prio:high jfs	1				6	183d	459d	0/29	auto-obsoleted due to no activity on 2026/06/19 23:23
upstream	INFO: task hung in do_new_mount (2) fs	1	syz, C	error	done	20	613d	914d	0/29	auto-obsoleted due to no activity on 2025/04/26 04:38
upstream	INFO: task hung in do_new_mount fs	1				1	1043d	1043d	0/29	auto-obsoleted due to no activity on 2024/02/11 00:35

Rank 🛈

upstream

INFO: task hung in do_new_mount (3) prio:high jfs

183d

459d

0/29

auto-obsoleted due to no activity on 2026/06/19 23:23

upstream

INFO: task hung in do_new_mount (2) fs

syz, C

error

done

613d

914d

0/29

auto-obsoleted due to no activity on 2025/04/26 04:38

upstream

INFO: task hung in do_new_mount fs

1043d

0/29

auto-obsoleted due to no activity on 2024/02/11 00:35

INFO: task syz.0.17:4913 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:0 pid:4913 tgid:4912 ppid:4820 task_flags:0x400140 flags:0x00800011 Call trace: __switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5526 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7277 __schedule_loop kernel/sched/core.c:7354 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7369 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7426 rwsem_down_write_slowpath+0x6ec/0x1174 kernel/locking/rwsem.c:1215 __down_write_common kernel/locking/rwsem.c:1347 [inline] __down_write kernel/locking/rwsem.c:1356 [inline] down_write+0xb4/0xc0 kernel/locking/rwsem.c:1632 inode_lock include/linux/fs.h:1024 [inline] do_lock_mount+0x158/0x63c fs/namespace.c:2768 do_new_mount_fc fs/namespace.c:3790 [inline] do_new_mount+0x360/0x538 fs/namespace.c:3848 path_mount+0x5f0/0xa88 fs/namespace.c:4168 do_mount+0xe8/0x148 fs/namespace.c:4181 __do_sys_mount fs/namespace.c:4397 [inline] __se_sys_mount fs/namespace.c:4374 [inline] __arm64_sys_mount+0x33c/0x388 fs/namespace.c:4374 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 INFO: task syz.0.17:4914 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:0 pid:4914 tgid:4912 ppid:4820 task_flags:0x400140 flags:0x00000011 Call trace: __switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5526 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7277 __schedule_loop kernel/sched/core.c:7354 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7369 request_wait_answer fs/fuse/dev.c:749 [inline] __fuse_request_send fs/fuse/dev.c:768 [inline] fuse_chan_send+0x840/0xf60 fs/fuse/dev.c:844 __fuse_simple_request+0xa0/0xb8 fs/fuse/req.c:69 fuse_simple_request fs/fuse/fuse_i.h:1012 [inline] fuse_do_setattr+0xb34/0x1468 fs/fuse/dir.c:2248 fuse_setattr+0x1f4/0x5e0 fs/fuse/dir.c:2373 notify_change+0x928/0xb7c fs/attr.c:556 chmod_common+0x200/0x3a4 fs/open.c:686 do_fchmodat+0x10c/0x1f8 fs/open.c:731 __do_sys_fchmodat fs/open.c:750 [inline] __se_sys_fchmodat fs/open.c:747 [inline] __arm64_sys_fchmodat+0x88/0xa0 fs/open.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Showing all locks held in the system: locks held by khungtaskd/31: 1, last CPU#0: #0: ffff800088d82260 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #0: ffff800088d82260 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffff800088d82260 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x4c/0x188 kernel/locking/lockdep.c:6871 locks held by kworker/u9:0/50: 3, on CPU#1: #0: ffff0000d8e34140 ((wq_completion)hci2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3371 [inline] #0: ffff0000d8e34140 ((wq_completion)hci2){+.+.}-{0:0}, at: process_scheduled_works+0x8c8/0x1250 kernel/workqueue.c:3479 #1: ffff8000902f7c40 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3371 [inline] #1: ffff8000902f7c40 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x8d0/0x1250 kernel/workqueue.c:3479 #2: ffff0000d0df0ea0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x178/0x374 net/bluetooth/hci_sync.c:331 locks held by kworker/u8:3/54: 5, last CPU#1: #0: ffff0000c004c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3371 [inline] #0: ffff0000c004c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x8c8/0x1250 kernel/workqueue.c:3479 #1: ffff800090337c40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3371 [inline] #1: ffff800090337c40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x8d0/0x1250 kernel/workqueue.c:3479 #2: ffff0001add89cd8 (&base->lock){-.-.}-{2:2}, at: devl_trylock+0x24/0x34 net/devlink/core.c:314 #3: ffff0000d3bb38e0 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:347 [inline] #3: ffff0000d3bb38e0 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: nsim_dev_trap_report drivers/net/netdevsim/dev.c:787 [inline] #3: ffff0000d3bb38e0 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: nsim_dev_trap_report_work+0x168/0x9cc drivers/net/netdevsim/dev.c:847 #4: ffff800088d82320 (rcu_read_lock_sched){....}-{1:2}, at: spin_lock_bh include/linux/spinlock.h:353 [inline] #4: ffff800088d82320 (rcu_read_lock_sched){....}-{1:2}, at: nsim_dev_trap_report drivers/net/netdevsim/dev.c:812 [inline] #4: ffff800088d82320 (rcu_read_lock_sched){....}-{1:2}, at: nsim_dev_trap_report_work+0x5ec/0x9cc drivers/net/netdevsim/dev.c:847 locks held by kworker/u8:6/1181: 1, last CPU#1: #0: ffff800088d82260 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #0: ffff800088d82260 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffff800088d82260 (rcu_read_lock){....}-{1:3}, at: process_one_work kernel/workqueue.c:3361 [inline] #0: ffff800088d82260 (rcu_read_lock){....}-{1:3}, at: process_scheduled_works+0x698/0x1250 kernel/workqueue.c:3479 locks held by getty/4488: 2, on CPU#1: #0: ffff0000c94b40a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009257e2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x348/0xf78 drivers/tty/n_tty.c:2211 locks held by kworker/1:5/4772: 3, on CPU#1: #0: ffff0000c002b540 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3371 [inline] #0: ffff0000c002b540 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x8c8/0x1250 kernel/workqueue.c:3479 #1: ffff80009b387c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3371 [inline] #1: ffff80009b387c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x8d0/0x1250 kernel/workqueue.c:3479 #2: ffff0000d4d66250 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x198/0x320 drivers/net/netdevsim/fib.c:1490 locks held by syz.0.17/4913: 1, on CPU#0: #0: ffff0000eeb44b80 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #0: ffff0000eeb44b80 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: do_lock_mount+0x158/0x63c fs/namespace.c:2768 locks held by syz.0.17/4914: 2, on CPU#1: #0: ffff0000d33d6460 (sb_writers#11){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:494 #1: ffff0000eeb44b80 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1029 [inline] #1: ffff0000eeb44b80 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: chmod_common+0x140/0x3a4 fs/open.c:678 locks held by syz.1.18/4956: 1, on CPU#1: #0: ffff0000eeb444c0 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #0: ffff0000eeb444c0 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: do_lock_mount+0x158/0x63c fs/namespace.c:2768 locks held by syz.1.18/4957: 2, on CPU#0: #0: ffff0000cfc96460 (sb_writers#11){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:494 #1: ffff0000eeb444c0 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1029 [inline] #1: ffff0000eeb444c0 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: chmod_common+0x140/0x3a4 fs/open.c:678 locks held by syz.2.19/5003: 1, on CPU#1: #0: ffff0000e0a7a300 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #0: ffff0000e0a7a300 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: do_lock_mount+0x158/0x63c fs/namespace.c:2768 locks held by syz.2.19/5005: 2, on CPU#1: #0: ffff0000c60bc460 (sb_writers#11){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:494 #1: ffff0000e0a7a300 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1029 [inline] #1: ffff0000e0a7a300 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: chmod_common+0x140/0x3a4 fs/open.c:678 locks held by syz.3.20/5051: 1, on CPU#0: #0: ffff0000e0a79c40 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #0: ffff0000e0a79c40 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: do_lock_mount+0x158/0x63c fs/namespace.c:2768 locks held by syz.3.20/5053: 2, on CPU#1: #0: ffff0000d120a460 (sb_writers#11){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:494 #1: ffff0000e0a79c40 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1029 [inline] #1: ffff0000e0a79c40 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: chmod_common+0x140/0x3a4 fs/open.c:678 locks held by syz.4.21/5105: 1, on CPU#0: #0: ffff0000eeb43e00 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #0: ffff0000eeb43e00 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: do_lock_mount+0x158/0x63c fs/namespace.c:2768 locks held by syz.4.21/5107: 2, on CPU#0: #0: ffff0000d9608460 (sb_writers#11){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:494 #1: ffff0000eeb43e00 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1029 [inline] #1: ffff0000eeb43e00 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: chmod_common+0x140/0x3a4 fs/open.c:678 locks held by syz.5.22/5154: 1, on CPU#1: #0: ffff0000e0a79580 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #0: ffff0000e0a79580 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: do_lock_mount+0x158/0x63c fs/namespace.c:2768 locks held by syz.5.22/5156: 2, on CPU#1: #0: ffff0000d4608460 (sb_writers#11){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:494 #1: ffff0000e0a79580 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1029 [inline] #1: ffff0000e0a79580 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: chmod_common+0x140/0x3a4 fs/open.c:678 locks held by syz.6.23/5202: 1, on CPU#0: #0: ffff0000e0a78ec0 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #0: ffff0000e0a78ec0 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: do_lock_mount+0x158/0x63c fs/namespace.c:2768 locks held by syz.6.23/5203: 2, on CPU#0: #0: ffff0000cb9ae460 (sb_writers#11){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:494 #1: ffff0000e0a78ec0 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1029 [inline] #1: ffff0000e0a78ec0 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: chmod_common+0x140/0x3a4 fs/open.c:678 locks held by syz.7.24/5256: 1, on CPU#1: #0: ffff0000e0a78800 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #0: ffff0000e0a78800 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: do_lock_mount+0x158/0x63c fs/namespace.c:2768 locks held by syz.7.24/5257: 2, on CPU#0: #0: ffff0000f2b3a460 (sb_writers#11){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:494 #1: ffff0000e0a78800 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1029 [inline] #1: ffff0000e0a78800 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: chmod_common+0x140/0x3a4 fs/open.c:678 locks held by syz.8.25/5304: 1, on CPU#1: #0: ffff0000eeb43740 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #0: ffff0000eeb43740 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: do_lock_mount+0x158/0x63c fs/namespace.c:2768 locks held by syz.8.25/5305: 2, on CPU#0: #0: ffff0000f2054460 (sb_writers#11){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:494 #1: ffff0000eeb43740 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1029 [inline] #1: ffff0000eeb43740 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: chmod_common+0x140/0x3a4 fs/open.c:678 locks held by syz.9.26/5354: 1, on CPU#1: #0: ffff0000eeb43080 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #0: ffff0000eeb43080 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: do_lock_mount+0x158/0x63c fs/namespace.c:2768 locks held by syz.9.26/5356: 2, on CPU#0: #0: ffff0000d454c460 (sb_writers#11){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:494 #1: ffff0000eeb43080 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1029 [inline] #1: ffff0000eeb43080 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: chmod_common+0x140/0x3a4 fs/open.c:678 locks held by syz.0.27/5397: 2, on CPU#0: #0: ffff0000ca324460 (sb_writers#11){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:494 #1: ffff0000eeb429c0 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1029 [inline] #1: ffff0000eeb429c0 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: chmod_common+0x140/0x3a4 fs/open.c:678 =============================================

Crashes (6):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	VM info	Assets (help?)	Manager	Title
2026/09/20 22:45	git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci	38872197cae2	853b104b	.config	console log	report	syz / log		[disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)]	ci-upstream-gce-arm64	INFO: task hung in do_new_mount
2026/09/13 19:27	upstream	d681d7ef617e	70a60e12	.config	console log	report		info	[disk image] [vmlinux] [kernel image]	ci2-upstream-fs	INFO: task hung in do_new_mount
2026/08/23 16:25	upstream	2709dd5ae32f	1e72964b	.config	console log	report		info	[disk image] [vmlinux] [kernel image]	ci2-upstream-fs	INFO: task hung in do_new_mount
2026/08/19 02:41	upstream	0f23d56f17fd	1e72964b	.config	console log	report		info	[disk image] [vmlinux] [kernel image]	ci2-upstream-fs	INFO: task hung in do_new_mount
2026/06/29 20:09	upstream	dc59e4fea9d8	6a0c72dc	.config	console log	report		info	[disk image] [vmlinux] [kernel image]	ci2-upstream-fs	INFO: task hung in do_new_mount
2026/09/20 12:55	git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci	38872197cae2	853b104b	.config	console log	report		info	[disk image] [vmlinux] [kernel image]	ci-upstream-gce-arm64	INFO: task hung in do_new_mount

Crashes (6):

Assets (help?)