INFO: task syz.4.3109:15032 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.4.3109 state:D stack:27128 pid:15032 tgid:15029 ppid:14032 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x172b/0x5550 kernel/sched/core.c:7228
__schedule_loop kernel/sched/core.c:7307 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7322
cgroup_lock_and_drain_offline+0x516/0x650 kernel/cgroup/cgroup.c:3275
cgroup1_get_tree+0xa2/0x8a0 kernel/cgroup/cgroup-v1.c:1265
vfs_get_tree+0x92/0x2a0 fs/super.c:1694
fc_mount fs/namespace.c:1198 [inline]
do_new_mount_fc fs/namespace.c:3765 [inline]
do_new_mount+0x341/0xd30 fs/namespace.c:3841
do_mount fs/namespace.c:4174 [inline]
__do_sys_mount fs/namespace.c:4390 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4367
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2db51cce59
RSP: 002b:00007f2db3405028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f2db5446090 RCX: 00007f2db51cce59
RDX: 00002000000001c0 RSI: 0000200000000180 RDI: 0000000000000000
RBP: 00007f2db5262e6f R08: 00002000000007c0 R09: 0000000000000000
R10: 0000000000014440 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2db5446128 R14: 00007f2db5446090 R15: 00007ffdb2267d88
Showing all locks held in the system:
4 locks held by pr/legacy/17:
#0: ffffffff8e3bd300 (console_lock){+.+.}-{0:0}, at: legacy_kthread_func+0x1a3/0x250 kernel/printk/printk.c:3711
#1: ffffffff8e2a4bf8 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:305 [inline]
#1: ffffffff8e2a4bf8 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:428 [inline]
#1: ffffffff8e2a4bf8 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:291 [inline]
#1: ffffffff8e2a4bf8 (console_srcu){....}-{0:0}, at: console_flush_one_record+0xfa/0xb90 kernel/printk/printk.c:3246
#2: ffffffff9a020cd8 (&port_lock_key){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
#2: ffffffff9a020cd8 (&port_lock_key){+.+.}-{3:3}, at: uart_port_lock_irqsave include/linux/serial_core.h:719 [inline]
#2: ffffffff9a020cd8 (&port_lock_key){+.+.}-{3:3}, at: serial8250_console_write+0x178/0x1b50 drivers/tty/serial/8250/8250_port.c:3338
#3: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#3: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#3: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
#3: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400 kernel/locking/spinlock_rt.c:57
1 lock held by khungtaskd/39:
#0: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6777
2 locks held by udevd/4973:
#0: ffffffff8eb031b8 (tomoyo_ss){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:187 [inline]
#0: ffffffff8eb031b8 (tomoyo_ss){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:294 [inline]
#0: ffffffff8eb031b8 (tomoyo_ss){.+.+}-{0:0}, at: tomoyo_read_lock security/tomoyo/common.h:1112 [inline]
#0: ffffffff8eb031b8 (tomoyo_ss){.+.+}-{0:0}, at: tomoyo_check_open_permission+0x1d3/0x470 security/tomoyo/file.c:772
#1: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#1: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#1: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1183 [inline]
#1: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa6/0x2550 arch/x86/kernel/unwind_orc.c:495
2 locks held by getty/5361:
#0: ffff8880368ec0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003cc62e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x465/0x1490 drivers/tty/n_tty.c:2211
8 locks held by kworker/0:3/5612:
#0: ffff8880222ba138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x897/0x1630 kernel/workqueue.c:3301
#1: ffffc9000437fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630 kernel/workqueue.c:3302
#2: ffff88802a794210 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1102 [inline]
#2: ffff88802a794210 (&dev->mutex){....}-{4:4}, at: hub_event+0x17c/0x4f60 drivers/usb/core/hub.c:5899
#3: ffff88804db9c210 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1102 [inline]
#3: ffff88804db9c210 (&dev->mutex){....}-{4:4}, at: usb_remote_wakeup+0x23/0x120 drivers/usb/core/hub.c:3886
#4: ffff88802a7a2658 (&port_dev->status_lock){+.+.}-{4:4}, at: usb_lock_port drivers/usb/core/hub.c:3252 [inline]
#4: ffff88802a7a2658 (&port_dev->status_lock){+.+.}-{4:4}, at: usb_port_resume+0x270/0x1ef0 drivers/usb/core/hub.c:3810
#5: ffff88802a7a3088 (&hub->status_mutex){+.+.}-{4:4}, at: hub_ext_port_status+0x53/0x820 drivers/usb/core/hub.c:623
#6: ffffffff8f05b8b8 (hcd_root_hub_lock){+.+.}-{3:3}, at: spin_lock_irq include/linux/spinlock_rt.h:96 [inline]
#6: ffffffff8f05b8b8 (hcd_root_hub_lock){+.+.}-{3:3}, at: rh_call_control drivers/usb/core/hcd.c:465 [inline]
#6: ffffffff8f05b8b8 (hcd_root_hub_lock){+.+.}-{3:3}, at: rh_urb_enqueue drivers/usb/core/hcd.c:817 [inline]
#6: ffffffff8f05b8b8 (hcd_root_hub_lock){+.+.}-{3:3}, at: usb_hcd_submit_urb+0x382/0x1b10 drivers/usb/core/hcd.c:1538
#7: ffff8880b863baa0 (&rq->__lock){-...}-{2:2}, at: finish_lock_switch kernel/sched/core.c:5238 [inline]
#7: ffff8880b863baa0 (&rq->__lock){-...}-{2:2}, at: finish_task_switch+0x15c/0xbd0 kernel/sched/core.c:5359
3 locks held by kworker/u8:15/6661:
#0: ffff888031b36138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x897/0x1630 kernel/workqueue.c:3301
#1: ffffc900064f7c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630 kernel/workqueue.c:3302
#2: ffffffff8f7b0bb8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#2: ffffffff8f7b0bb8 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x124/0x1680 net/ipv6/addrconf.c:4221
3 locks held by kworker/0:7/11171:
#0: ffff88813fe57938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x897/0x1630 kernel/workqueue.c:3301
#1: ffffc9000492fc40 (rx_mode_work){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630 kernel/workqueue.c:3302
#2: ffffffff8f7b0bb8 (rtnl_mutex){+.+.}-{4:4}, at: netdev_rx_mode_work+0x1c/0x460 net/core/dev_addr_lists.c:1346
6 locks held by syz-executor/17186:
#0: ffffffff8e49e250 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1537 [inline]
#0: ffffffff8e49e250 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm+0x10f/0x480 kernel/fork.c:1590
#1: ffff88803b4f2cb0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:554 [inline]
#1: ffff88803b4f2cb0 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x184/0x1d70 mm/mmap.c:1739
#2: ffff888034fd5530 (&mm->mmap_lock/1){+.+.}-{4:4}, at: mmap_write_lock_nested include/linux/mmap_lock.h:544 [inline]
#2: ffff888034fd5530 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x272/0x1d70 mm/mmap.c:1746
#3: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#3: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#3: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x200 mm/pgtable-generic.c:290
#4: ffff88802c6b6dd8 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
#4: ffff88802c6b6dd8 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: pte_offset_map_lock+0x13d/0x210 mm/pgtable-generic.c:404
#5: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#5: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#5: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
#5: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400 kernel/locking/spinlock_rt.c:57
2 locks held by syz-executor/17421:
#0: ffffffff8f7b0bb8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff8f7b0bb8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff8f7b0bb8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x883/0x1bb0 net/core/rtnetlink.c:4150
#1: ffff88805a79cfd8 (&dev_instance_lock_key#23){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2842 [inline]
#1: ffff88805a79cfd8 (&dev_instance_lock_key#23){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline]
#1: ffff88805a79cfd8 (&dev_instance_lock_key#23){+.+.}-{4:4}, at: do_setlink+0x3d2/0x45a0 net/core/rtnetlink.c:3117
2 locks held by sed/17734:
#0: ffff88802c3962b0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:554 [inline]
#0: ffff88802c3962b0 (&mm->mmap_lock){++++}-{4:4}, at: do_mprotect_pkey+0x25b/0xd20 mm/mprotect.c:867
#1: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#1: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#1: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1183 [inline]
#1: ffffffff8e3cb2a0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa6/0x2550 arch/x86/kernel/unwind_orc.c:495
2 locks held by syz.6.3918/17736:
#0: ffff888034ffc928 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: netlink_dump+0xe2/0xe10 net/netlink/af_netlink.c:2273
#1: ffffffff8f7b0bb8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#1: ffffffff8f7b0bb8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dump_ifinfo+0xa31/0x1450 net/core/rtnetlink.c:2554
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 39 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd3/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5612 Comm: kworker/0:3 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:__bfs kernel/locking/lockdep.c:1755 [inline]
RIP: 0010:__bfs_backwards kernel/locking/lockdep.c:1862 [inline]
RIP: 0010:check_irq_usage kernel/locking/lockdep.c:2798 [inline]
RIP: 0010:check_prev_add kernel/locking/lockdep.c:3171 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3286 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3910 [inline]
RIP: 0010:__lock_acquire+0x1821/0x2d10 kernel/locking/lockdep.c:5239
Code: 00 0f 83 8a 01 00 00 4e 8b 24 fd a0 89 c3 95 ff c0 25 ff 0f 00 00 89 05 fd b7 22 14 4d 85 e4 0f 84 b2 01 00 00 49 8b 44 24 10 <48> 85 c0 0f 84 3c 0d 00 00 8b 0d e8 b7 22 14 39 48 5c 0f 84 67 ff
RSP: 0018:ffffc9000437e9e0 EFLAGS: 00000082
RAX: ffffffff9370ed80 RBX: 00000000000003cd RCX: ffffffff9679ccf8
RDX: ffffffff965c8fc8 RSI: ffff888038594b70 RDI: 00000000000003cd
RBP: d1cb425577aa0f36 R08: ffffc9000437e9a8 R09: 0000000000000020
R10: ffffc9000437ebe8 R11: ffffffff81a1a420 R12: ffffffff9679ccf8
R13: ffff888038594b70 R14: ffff888038593e00 R15: 00000000000005d7
FS: 0000000000000000(0000) GS:ffff888125a6b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa6e5ca8c50 CR3: 0000000037dba000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5870
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
debug_object_deactivate+0x9a/0x250 lib/debugobjects.c:928
debug_hrtimer_deactivate kernel/time/hrtimer.c:490 [inline]
remove_and_enqueue_same_base kernel/time/hrtimer.c:1252 [inline]
__hrtimer_start_range_ns kernel/time/hrtimer.c:1402 [inline]
hrtimer_start_range_ns_common+0x3f7/0xba0 kernel/time/hrtimer.c:1481
hrtimer_start_range_ns+0x111/0x3f0 kernel/time/hrtimer.c:1503
hrtimer_start include/linux/hrtimer.h:223 [inline]
hrtick_cond_restart kernel/sched/core.c:939 [inline]
hrtick_schedule_exit kernel/sched/core.c:1001 [inline]
finish_lock_switch kernel/sched/core.c:5240 [inline]
finish_task_switch+0x3ca/0xbd0 kernel/sched/core.c:5359
context_switch kernel/sched/core.c:5507 [inline]
__schedule+0x1733/0x5550 kernel/sched/core.c:7228
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7409
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
class_preempt_destructor include/linux/preempt.h:468 [inline]
raw_spin_unlock_irqrestore_wake include/linux/sched/wake_q.h:102 [inline]
rtlock_slowlock kernel/locking/rtmutex.c:1922 [inline]
rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
__rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
rt_spin_lock+0x316/0x400 kernel/locking/spinlock_rt.c:57
spin_lock_irq include/linux/spinlock_rt.h:96 [inline]
rh_call_control drivers/usb/core/hcd.c:465 [inline]
rh_urb_enqueue drivers/usb/core/hcd.c:817 [inline]
usb_hcd_submit_urb+0x382/0x1b10 drivers/usb/core/hcd.c:1538
usb_start_wait_urb+0x13f/0x5b0 drivers/usb/core/message.c:62
usb_internal_control_msg drivers/usb/core/message.c:117 [inline]
usb_control_msg+0x234/0x3e0 drivers/usb/core/message.c:167
get_port_status drivers/usb/core/hub.c:607 [inline]
hub_ext_port_status+0x116/0x820 drivers/usb/core/hub.c:624
usb_hub_port_status drivers/usb/core/hub.c:674 [inline]
usb_port_resume+0x290/0x1ef0 drivers/usb/core/hub.c:3813
usb_generic_driver_resume+0x4a/0x90 drivers/usb/core/generic.c:317
usb_resume_device drivers/usb/core/driver.c:1304 [inline]
usb_resume_both+0x32d/0xb00 drivers/usb/core/driver.c:1555
__rpm_callback+0x2ba/0x920 drivers/base/power/runtime.c:406
rpm_callback drivers/base/power/runtime.c:460 [inline]
rpm_resume+0xfe8/0x1650 drivers/base/power/runtime.c:939
__pm_runtime_resume+0x119/0x170 drivers/base/power/runtime.c:1197
pm_runtime_get_active include/linux/pm_runtime.h:520 [inline]
pm_runtime_resume_and_get include/linux/pm_runtime.h:539 [inline]
usb_autoresume_device+0x23/0xf0 drivers/usb/core/driver.c:1765
usb_remote_wakeup+0x6a/0x120 drivers/usb/core/hub.c:3889
hub_port_connect_change drivers/usb/core/hub.c:5693 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x1cd3/0x4f60 drivers/usb/core/hub.c:5953
process_one_work+0x98b/0x1630 kernel/workqueue.c:3326
process_scheduled_works kernel/workqueue.c:3409 [inline]
worker_thread+0xb49/0x1140 kernel/workqueue.c:3490
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245