INFO: task syz-executor:2953 blocked for more than 143 seconds. Not tainted 6.16.0-rc2-syzkaller-00050-ge35a5d814525 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:23400 pid:2953 tgid:2953 ppid:1 task_flags:0x400140 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x132a/0x3b10 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6878 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935 rwsem_down_read_slowpath+0x62f/0xb60 kernel/locking/rwsem.c:1084 __down_read_common kernel/locking/rwsem.c:1248 [inline] __down_read kernel/locking/rwsem.c:1261 [inline] down_read+0xef/0x480 kernel/locking/rwsem.c:1526 kernfs_dop_revalidate+0xa5/0x740 fs/kernfs/dir.c:1180 d_revalidate fs/namei.c:929 [inline] d_revalidate fs/namei.c:925 [inline] lookup_fast+0x266/0x610 fs/namei.c:1778 walk_component+0x5b/0x5b0 fs/namei.c:2134 link_path_walk+0x627/0xe20 fs/namei.c:2506 path_openat+0x1b0/0x2cb0 fs/namei.c:4042 do_filp_open+0x20b/0x470 fs/namei.c:4073 do_sys_openat2+0x11b/0x1d0 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __x64_sys_openat+0x174/0x210 fs/open.c:1463 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe1d8b1e221 RSP: 002b:00007ffd3b9cd030 EFLAGS: 00000287 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000000004ce RCX: 00007fe1d8b1e221 RDX: 0000000000090800 RSI: 00007fe1d8ba0e59 RDI: 00000000ffffff9c RBP: 00007ffd3b9cd0dc R08: 000000000002ec72 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000287 R12: 00000000000001b6 R13: 0000000000000000 R14: 00000000000edbb0 R15: 00007ffd3b9cd130 INFO: task syz.0.2107:12873 blocked for more than 171 seconds. Not tainted 6.16.0-rc2-syzkaller-00050-ge35a5d814525 #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.2107 state:D stack:27736 pid:12873 tgid:12872 ppid:2955 task_flags:0x40044c flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x132a/0x3b10 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6878 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935 rwsem_down_write_slowpath+0x524/0x1310 kernel/locking/rwsem.c:1176 __down_write_common kernel/locking/rwsem.c:1304 [inline] __down_write kernel/locking/rwsem.c:1313 [inline] down_write+0x1d6/0x200 kernel/locking/rwsem.c:1578 kernfs_remove_by_name_ns+0x3d/0x110 fs/kernfs/dir.c:1712 sysfs_remove_file include/linux/sysfs.h:777 [inline] driver_remove_file drivers/base/driver.c:201 [inline] driver_remove_file+0x4a/0x60 drivers/base/driver.c:197 remove_bind_files drivers/base/bus.c:605 [inline] bus_remove_driver+0x224/0x2c0 drivers/base/bus.c:743 driver_unregister+0x76/0xb0 drivers/base/driver.c:277 usb_gadget_unregister_driver+0x49/0x70 drivers/usb/gadget/udc/core.c:1732 raw_release+0x1ae/0x2b0 drivers/usb/gadget/legacy/raw_gadget.c:462 __fput+0x3ff/0xb70 fs/file_table.c:465 task_work_run+0x14d/0x240 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x864/0x2bd0 kernel/exit.c:955 do_group_exit+0xd3/0x2a0 kernel/exit.c:1104 get_signal+0x2673/0x26d0 kernel/signal.c:3034 arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x7c/0xe0 kernel/entry/common.c:111 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x3e9/0x4b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f24af19e52b RSP: 002b:00007f24ad804f10 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 00007f24af19e52b RDX: 00007f24ad805fe0 RSI: 0000000080085502 RDI: 0000000000000003 RBP: 00007f24ad805fe0 R08: 0000000000000000 R09: 00302e6364755f79 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000080085502 R13: 0000000800000000 R14: 0000200000000500 R15: 00007f24af22bc4f Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff890c7d80 ( rcu_read_lock){....}-{1:3} , at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] , at: rcu_read_lock include/linux/rcupdate.h:841 [inline] , at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6770 4 locks held by kworker/1:1/37: #0: ffff8881066f3d48 ( (wq_completion)usb_hub_wq ){+.+.}-{0:0} , at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213 #1: ffffc90000277d10 ((work_completion)(&hub->events) ){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214 #2: ffff88810b386198 (&dev->mutex ){....}-{4:4} , at: device_lock include/linux/device.h:884 [inline] , at: hub_event+0x1be/0x5030 drivers/usb/core/hub.c:5863 #3: ffff888100ac4988 ( &root->kernfs_rwsem ){++++}-{4:4} , at: kernfs_activate fs/kernfs/dir.c:1425 [inline] , at: kernfs_add_one+0x349/0x840 fs/kernfs/dir.c:834 2 locks held by getty/2909: #0: ffff8881123bc0a0 (&tty->ldisc_sem ){++++}-{0:0} , at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900000432f0 ( &ldata->atomic_read_lock ){+.+.}-{4:4} , at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222 1 lock held by syz-executor/2953: #0: ffff888100ac4988 ( &root->kernfs_rwsem){++++}-{4:4} , at: kernfs_dop_revalidate+0x397/0x740 fs/kernfs/dir.c:1162 1 lock held by syz-executor/2954: #0: ffff888100ac4988 (&root->kernfs_rwsem ){++++}-{4:4}, at: kernfs_dop_revalidate+0x397/0x740 fs/kernfs/dir.c:1162 1 lock held by syz-executor/2955: #0: ffff888100ac4988 ( &root->kernfs_rwsem){++++}-{4:4} , at: kernfs_dop_revalidate+0x397/0x740 fs/kernfs/dir.c:1162 1 lock held by syz-executor/2956: #0: ffff888100ac4988 (&root->kernfs_rwsem ){++++}-{4:4}, at: kernfs_dop_revalidate+0x397/0x740 fs/kernfs/dir.c:1162 1 lock held by syz-executor/2961: #0: ffff888100ac4988 (&root->kernfs_rwsem ){++++}-{4:4} , at: kernfs_dop_revalidate+0x397/0x740 fs/kernfs/dir.c:1162 1 lock held by udevd/5213: #0: ffff888100ac4988 ( &root->kernfs_rwsem ){++++}-{4:4} , at: kernfs_dop_revalidate+0xa5/0x740 fs/kernfs/dir.c:1180 3 locks held by kworker/0:4/5234: 4 locks held by udevd/5237: #0: ffff888135b7cc30 ( &p->lock ){+.+.}-{4:4} , at: seq_read_iter+0xe1/0x12c0 fs/seq_file.c:182 #1: ffff8881354b2488 ( &of->mutex #2 ){+.+.}-{4:4} , at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154 #2: ffff8881157bb0f8 ( kn->active#23 ){++++}-{0:0} , at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155 #3: ffff888111abc198 (&dev->mutex ){....}-{4:4} , at: device_lock_interruptible include/linux/device.h:889 [inline] , at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142 5 locks held by kworker/1:3/5238: 5 locks held by kworker/1:5/5262: 4 locks held by kworker/1:7/11414: 1 lock held by syz.3.2102/12849: 1 lock held by syz.0.2107/12873: #0: ffff888100ac4988 (&root->kernfs_rwsem ){++++}-{4:4} , at: kernfs_remove_by_name_ns+0x3d/0x110 fs/kernfs/dir.c:1712 1 lock held by syz.1.2109/12879: #0: ffffffff890d3378 ( rcu_state.exp_mutex ){+.+.}-{4:4} , at: exp_funnel_lock+0x284/0x3c0 kernel/rcu/tree_exp.h:304 1 lock held by syz-executor/12880: #0: ffff888100ac4988 (&root->kernfs_rwsem ){++++}-{4:4} , at: kernfs_dop_revalidate+0xa5/0x740 fs/kernfs/dir.c:1180 1 lock held by syz-executor/12881: #0: ffff888100ac4988 ( &root->kernfs_rwsem){++++}-{4:4} , at: kernfs_dop_revalidate+0xa5/0x740 fs/kernfs/dir.c:1180 1 lock held by syz-executor/12882: #0: ffff888100ac4988 ( &root->kernfs_rwsem ){++++}-{4:4}, at: kernfs_dop_revalidate+0xa5/0x740 fs/kernfs/dir.c:1180 1 lock held by syz-executor/12883: #0: ffff888100ac4988 (&root->kernfs_rwsem ){++++}-{4:4}, at: kernfs_dop_revalidate+0xa5/0x740 fs/kernfs/dir.c:1180 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.16.0-rc2-syzkaller-00050-ge35a5d814525 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline] watchdog+0xf70/0x12c0 kernel/hung_task.c:470 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x5b3/0x6c0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: yealink 2-1:36.0: unexpected response 0 NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5238 Comm: kworker/1:3 Not tainted 6.16.0-rc2-syzkaller-00050-ge35a5d814525 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events_power_efficient gc_worker RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x70 kernel/kcov.c:217 Code: f3 ed 0a 65 8b 05 99 f3 ed 0a a9 00 01 ff 00 74 1d f6 c4 01 74 43 a9 00 00 0f 00 75 3c a9 00 00 f0 00 75 35 8b 82 74 15 00 00 <85> c0 74 2b 8b 82 50 15 00 00 83 f8 02 75 20 48 8b 8a 58 15 00 00 RSP: 0018:ffffc900001a80e8 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 000000000000001e RCX: ffffffff872bc46e RDX: ffff888115bfd700 RSI: ffffffff872bc47c RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000020 R10: 0000000000000000 R11: 00000000004a0fb0 R12: 0000000000000000 R13: 0000000000000004 R14: 0000000000000004 R15: ffffc900001a82a0 FS: 0000000000000000(0000) GS:ffff888269264000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f24af181d60 CR3: 0000000008ea4000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: convert_num_spec.isra.0+0x3c/0x90 lib/vsprintf.c:2757 vsnprintf+0xdc5/0x1160 lib/vsprintf.c:2835 snprintf+0xc7/0x100 lib/vsprintf.c:2968 print_caller kernel/printk/printk.c:1390 [inline] info_print_prefix+0x134/0x350 kernel/printk/printk.c:1409 record_print_text+0x140/0x400 kernel/printk/printk.c:1456 printk_get_next_message+0x2d1/0x6d0 kernel/printk/printk.c:3024 console_emit_next_record kernel/printk/printk.c:3092 [inline] console_flush_all+0x6ea/0xc60 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xd8/0x210 kernel/printk/printk.c:3325 vprintk_emit+0x418/0x6d0 kernel/printk/printk.c:2450 dev_vprintk_emit drivers/base/core.c:4917 [inline] dev_printk_emit+0xfa/0x140 drivers/base/core.c:4928 __dev_printk+0xf5/0x270 drivers/base/core.c:4940 _dev_err+0xe4/0x120 drivers/base/core.c:4983 urb_irq_callback+0x12c/0x700 drivers/input/misc/yealink.c:435 __usb_hcd_giveback_urb+0x38d/0x6e0 drivers/usb/core/hcd.c:1650 usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1734 dummy_timer+0x180e/0x3a20 drivers/usb/gadget/udc/dummy_hcd.c:1995 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x202/0xad0 kernel/time/hrtimer.c:1825 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1842 handle_softirqs+0x205/0x8d0 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:rcu_read_lock include/linux/rcupdate.h:842 [inline] RIP: 0010:gc_worker+0xe43/0x16d0 net/netfilter/nf_conntrack_core.c:1535 Code: 5a 48 85 db 0f 85 ea 04 00 00 e8 68 79 3a fb fb e9 a7 f4 ff ff e8 5d 79 3a fb e8 98 05 20 fb 31 ff 89 c3 89 c6 e8 2d 74 3a fb <84> db 0f 85 0f f4 ff ff e8 40 79 3a fb e8 db fe eb 00 31 ff 89 c3 RSP: 0018:ffffc90004ab7b58 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff86435333 RDX: ffff888115bfd700 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffffffff93a8ea2c R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff888112400000 R13: 0000000000040000 R14: dffffc0000000000 R15: 0000000000001770 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x5b3/0x6c0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245