INFO: task kworker/u4:1:12 blocked for more than 143 seconds. Not tainted 6.4.0-rc1-syzkaller-00197-g838a854820ee #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:1 state:D stack:19904 pid:12 ppid:2 flags:0x00004000 Workqueue: events_unbound fsnotify_mark_destroy_workfn Call Trace: context_switch kernel/sched/core.c:5343 [inline] __schedule+0x187b/0x4900 kernel/sched/core.c:6669 schedule+0xc3/0x180 kernel/sched/core.c:6745 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2143 do_wait_for_common+0x449/0x5f0 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x4a/0x60 kernel/sched/completion.c:138 __synchronize_srcu+0x340/0x3f0 kernel/rcu/srcutree.c:1360 fsnotify_mark_destroy_workfn+0x146/0x340 fs/notify/mark.c:898 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2405 worker_thread+0xa63/0x1210 kernel/workqueue.c:2552 kthread+0x2b8/0x350 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 INFO: task kworker/u4:3:42 blocked for more than 145 seconds. Not tainted 6.4.0-rc1-syzkaller-00197-g838a854820ee #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:3 state:D stack:23384 pid:42 ppid:2 flags:0x00004000 Workqueue: events_unbound fsnotify_connector_destroy_workfn Call Trace: context_switch kernel/sched/core.c:5343 [inline] __schedule+0x187b/0x4900 kernel/sched/core.c:6669 schedule+0xc3/0x180 kernel/sched/core.c:6745 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2143 do_wait_for_common+0x449/0x5f0 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x4a/0x60 kernel/sched/completion.c:138 __synchronize_srcu+0x340/0x3f0 kernel/rcu/srcutree.c:1360 fsnotify_connector_destroy_workfn+0x44/0xa0 fs/notify/mark.c:208 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2405 worker_thread+0xa63/0x1210 kernel/workqueue.c:2552 kthread+0x2b8/0x350 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Showing all locks held in the system: 2 locks held by kworker/u4:1/12: #0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x77e/0x10e0 kernel/workqueue.c:2378 #1: ffffc90000117d20 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work+0x7c8/0x10e0 kernel/workqueue.c:2380 1 lock held by rcu_tasks_kthre/13: #0: ffffffff8cf27670 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:518 1 lock held by rcu_tasks_trace/14: #0: ffffffff8cf27a30 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:518 6 locks held by kworker/1:1/26: 1 lock held by khungtaskd/28: #0: ffffffff8cf274a0 ( rcu_read_lock ){....}-{1:2} , at: rcu_lock_acquire+0x0/0x30 1 lock held by khugepaged/34: #0: ffffffff8cfd0aa8 ( lock#3 ){+.+.}-{3:3} , at: __lru_add_drain_all+0x66/0x570 mm/swap.c:852 2 locks held by kworker/u4:3/42: #0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x77e/0x10e0 kernel/workqueue.c:2378 #1: ffffc90000b37d20 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work+0x7c8/0x10e0 kernel/workqueue.c:2380 6 locks held by kworker/0:2/901: 3 locks held by kworker/u4:6/1246: 2 locks held by getty/4747: #0: ffff888028cf4098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900015902f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ab/0x1db0 drivers/tty/n_tty.c:2176 6 locks held by kworker/1:4/5070: 11 locks held by kworker/0:7/5072: 6 locks held by kworker/0:8/5079: 2 locks held by dhcpcd/5139: #0: ffff888073f06e10 ( &sb->s_type->i_mutex_key #9 ){+.+.}-{3:3} , at: inode_lock include/linux/fs.h:775 [inline] , at: __sock_release net/socket.c:652 [inline] , at: sock_close+0x9c/0x230 net/socket.c:1397 #1: ffffffff8cf2cb78 ( rcu_state.exp_mutex ){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:325 [inline] ){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x46c/0x890 kernel/rcu/tree_exp.h:992 1 lock held by dhcpcd/5142: #0: ffff888073eb7a10 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #0: ffff888073eb7a10 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: __sock_release net/socket.c:652 [inline] #0: ffff888073eb7a10 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: sock_close+0x9c/0x230 net/socket.c:1397 2 locks held by dhcpcd/5144: #0: ffff888073f02c10 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #0: ffff888073f02c10 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: __sock_release net/socket.c:652 [inline] #0: ffff888073f02c10 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: sock_close+0x9c/0x230 net/socket.c:1397 #1: ffffffff8cf2cb78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:293 [inline] #1: ffffffff8cf2cb78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3a3/0x890 kernel/rcu/tree_exp.h:992 1 lock held by dhcpcd/5145: #0: ffff888073eb4410 ( &sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] &sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: __sock_release net/socket.c:652 [inline] &sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: sock_close+0x9c/0x230 net/socket.c:1397 1 lock held by dhcpcd/5146: #0: ffff888073eb1410 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #0: ffff888073eb1410 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: __sock_release net/socket.c:652 [inline] #0: ffff888073eb1410 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: sock_close+0x9c/0x230 net/socket.c:1397 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.4.0-rc1-syzkaller-00197-g838a854820ee #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x187/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xec2/0xf00 kernel/hung_task.c:379 kthread+0x2b8/0x350 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 901 Comm: kworker/0:2 Not tainted 6.4.0-rc1-syzkaller-00197-g838a854820ee #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 Workqueue: usb_hub_wq hub_event RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:80 [inline] RIP: 0010:rcu_is_watching+0x8/0xb0 kernel/rcu/tree.c:694 Code: e0 dd f2 8c 4c 89 f6 e8 66 75 f8 02 e9 2b ff ff ff e8 cc 90 3a 09 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 41 57 41 56 <53> 65 ff 05 58 59 8f 7e e8 bb aa 3a 09 89 c3 83 f8 08 73 76 49 bf RSP: 0018:ffffc90000007c08 EFLAGS: 00000057 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff8192308c RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8e55c328 RBP: ffffc90000007e10 R08: dffffc0000000000 R09: fffffbfff1cab866 R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff11017307af9 R13: ffffc90000007d70 R14: ffff888141f1c008 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3e95f84558 CR3: 0000000077937000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_irq_enable+0x3b/0xf0 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x18/0x40 kernel/trace/trace_preemptirq.c:56 net_rx_action+0x490/0x1010 net/core/dev.c:6672 __do_softirq+0x2ab/0x908 kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x159/0x240 kernel/softirq.c:650 irq_exit_rcu+0x9/0x20 kernel/softirq.c:662 common_interrupt+0xa8/0xc0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636 RIP: 0010:console_trylock_spinning+0x3b8/0x460 Code: ed 0f 84 48 ff ff ff e8 76 cd 1c 00 fb 31 db eb 45 e8 6c cd 1c 00 e8 07 41 40 09 4d 85 ed 74 cd e8 5d cd 1c 00 fb f3 0f 1e fa 01 00 00 00 48 c7 c7 a0 31 e0 8c 31 f6 ba 01 00 00 00 31 c9 41 RSP: 0018:ffffc90005e5e2e0 EFLAGS: 00000293 RAX: ffffffff816eaf43 RBX: 0000000000000000 RCX: ffff888020ba3b80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90005e5e3a8 R08: ffffffff816eaefc R09: fffffbfff206505a R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000bcbc5c R13: 0000000000000200 R14: 0000000000000046 R15: dffffc0000000000 vprintk_emit+0xbc/0x1f0 kernel/printk/printk.c:2306 dev_vprintk_emit+0x2ae/0x330 drivers/base/core.c:4840 dev_printk_emit+0xdd/0x120 drivers/base/core.c:4851 _dev_warn+0x122/0x170 drivers/base/core.c:4907 hid_parser_main+0x71b/0xaa0 drivers/hid/hid-core.c:632 hid_open_report+0xaf0/0x1490 drivers/hid/hid-core.c:1269 hid_parse include/linux/hid.h:1090 [inline] a4_probe+0xa6/0x120 drivers/hid/hid-a4tech.c:128 hid_device_probe+0x29c/0x3a0 drivers/hid/hid-core.c:2633 really_probe+0x294/0xc30 drivers/base/dd.c:658 __driver_probe_device+0x1a2/0x3d0 drivers/base/dd.c:800 driver_probe_device+0x50/0x420 drivers/base/dd.c:830 __device_attach_driver+0x2d3/0x520 drivers/base/dd.c:958 bus_for_each_drv+0x24a/0x2d0 drivers/base/bus.c:457 __device_attach+0x32f/0x510 drivers/base/dd.c:1030 bus_probe_device+0x185/0x260 drivers/base/bus.c:532 device_add+0xb75/0xf60 drivers/base/core.c:3625 hid_add_device+0x3a9/0x510 drivers/hid/hid-core.c:2785 usbhid_probe+0xb38/0xea0 drivers/hid/usbhid/hid-core.c:1429 usb_probe_interface+0x5c4/0xb00 drivers/usb/core/driver.c:396 really_probe+0x294/0xc30 drivers/base/dd.c:658 __driver_probe_device+0x1a2/0x3d0 drivers/base/dd.c:800 driver_probe_device+0x50/0x420 drivers/base/dd.c:830 __device_attach_driver+0x2d3/0x520 drivers/base/dd.c:958 bus_for_each_drv+0x24a/0x2d0 drivers/base/bus.c:457 __device_attach+0x32f/0x510 drivers/base/dd.c:1030 bus_probe_device+0x185/0x260 drivers/base/bus.c:532 device_add+0xb75/0xf60 drivers/base/core.c:3625 usb_set_configuration+0x1976/0x1fb0 drivers/usb/core/message.c:2211 usb_generic_driver_probe+0x88/0x140 drivers/usb/core/generic.c:238 usb_probe_device+0x134/0x270 drivers/usb/core/driver.c:293 really_probe+0x294/0xc30 drivers/base/dd.c:658 __driver_probe_device+0x1a2/0x3d0 drivers/base/dd.c:800 driver_probe_device+0x50/0x420 drivers/base/dd.c:830 __device_attach_driver+0x2d3/0x520 drivers/base/dd.c:958 bus_for_each_drv+0x24a/0x2d0 drivers/base/bus.c:457 __device_attach+0x32f/0x510 drivers/base/dd.c:1030 bus_probe_device+0x185/0x260 drivers/base/bus.c:532 device_add+0xb75/0xf60 drivers/base/core.c:3625 usb_new_device+0xb7e/0x18d0 drivers/usb/core/hub.c:2575 hub_port_connect drivers/usb/core/hub.c:5407 [inline] hub_port_connect_change drivers/usb/core/hub.c:5551 [inline] port_event drivers/usb/core/hub.c:5711 [inline] hub_event+0x3016/0x5460 drivers/usb/core/hub.c:5793 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2405 process_scheduled_works kernel/workqueue.c:2468 [inline] worker_thread+0xd20/0x1210 kernel/workqueue.c:2554 kthread+0x2b8/0x350 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308