INFO: task kworker/1:38:11065 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:38 D27752 11065 2 0x80000000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 usb_kill_urb.part.0+0x197/0x220 drivers/usb/core/urb.c:697 usb_kill_urb+0x7c/0x90 drivers/usb/core/urb.c:692 usb_start_wait_urb+0x252/0x4c0 drivers/usb/core/message.c:63 usb_internal_control_msg drivers/usb/core/message.c:101 [inline] usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:152 hub_port_init+0x12dc/0x3120 drivers/usb/core/hub.c:4704 hub_port_connect drivers/usb/core/hub.c:5070 [inline] hub_port_connect_change drivers/usb/core/hub.c:5253 [inline] port_event drivers/usb/core/hub.c:5361 [inline] hub_event+0x1ccd/0x44a0 drivers/usb/core/hub.c:5441 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 00000000195e7ca7 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7799: #0: 000000008a9cd525 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 5 locks held by kworker/1:38/11065: #0: 0000000007c28ea1 ((wq_completion)"usb_hub_wq"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000747d1907 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 0000000084e8fd77 (&dev->mutex){....}, at: device_lock include/linux/device.h:1174 [inline] #2: 0000000084e8fd77 (&dev->mutex){....}, at: hub_event+0x11e/0x44a0 drivers/usb/core/hub.c:5387 #3: 000000005e4a3102 (&port_dev->status_lock){+.+.}, at: usb_lock_port drivers/usb/core/hub.c:2983 [inline] #3: 000000005e4a3102 (&port_dev->status_lock){+.+.}, at: hub_port_connect drivers/usb/core/hub.c:5069 [inline] #3: 000000005e4a3102 (&port_dev->status_lock){+.+.}, at: hub_port_connect_change drivers/usb/core/hub.c:5253 [inline] #3: 000000005e4a3102 (&port_dev->status_lock){+.+.}, at: port_event drivers/usb/core/hub.c:5361 [inline] #3: 000000005e4a3102 (&port_dev->status_lock){+.+.}, at: hub_event+0x1cb8/0x44a0 drivers/usb/core/hub.c:5441 #4: 00000000ca633621 (hcd->address0_mutex){+.+.}, at: hub_port_init+0x1b9/0x3120 drivers/usb/core/hub.c:4578 2 locks held by syz-executor.1/12735: #0: 00000000770eb9ac (&sb->s_type->i_mutex_key#13){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #0: 00000000770eb9ac (&sb->s_type->i_mutex_key#13){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:598 #1: 000000007298b123 (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #1: 000000007298b123 (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x4dc/0x6f0 kernel/rcu/tree_exp.h:667 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8123 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 RIP: 0010:preempt_latency_start kernel/sched/core.c:3218 [inline] RIP: 0010:preempt_count_add+0xd8/0x190 kernel/sched/core.c:3241 Code: 00 85 c0 75 35 65 48 8b 2c 25 c0 df 01 00 48 8d bd 38 12 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 8e 00 00 00 48 89 9d 38 12 00 00 5b 5d c3 31 ff 31 db e8 ff RSP: 0018:ffff88809ca77720 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffffffff81298225 RCX: 0000000000000000 RDX: 1ffff1101384ce4f RSI: ffff88809ca776c8 RDI: ffff88809c267278 RBP: ffff88809c266040 R08: 0000000000000001 R09: 0000000000000001 R10: ffff88809ca778c7 R11: 0000000000074071 R12: ffff88809ca778b0 R13: 0000000000000000 R14: ffff88809ca77868 R15: 0000000000000001 FS: 00005555571ae400(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fce554071b8 CR3: 000000009d191000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unwind_next_frame+0x135/0x1400 arch/x86/kernel/unwind_orc.c:407 __save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x126/0x1f0 mm/kasan/kasan.c:521 __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 __vunmap+0x2b2/0x3f0 mm/vmalloc.c:1537 vfree+0x65/0x100 mm/vmalloc.c:1598 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:870 [inline] get_entries net/ipv4/netfilter/ip_tables.c:1027 [inline] do_ipt_get_ctl+0x6e8/0x8e0 net/ipv4/netfilter/ip_tables.c:1705 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:122 ip_getsockopt net/ipv4/ip_sockglue.c:1574 [inline] ip_getsockopt+0x167/0x1c0 net/ipv4/ip_sockglue.c:1554 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:3629 __sys_getsockopt+0x135/0x210 net/socket.c:2050 __do_sys_getsockopt net/socket.c:2061 [inline] __se_sys_getsockopt net/socket.c:2058 [inline] __x64_sys_getsockopt+0xba/0x150 net/socket.c:2058 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fce55314bca Code: 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff17d94b28 EFLAGS: 00000212 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fce55314bca RDX: 0000000000000041 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007fff17d94b50 R08: 00007fff17d94b4c R09: fefefefeff646b66 R10: 00007fff17d94bb0 R11: 0000000000000212 R12: 00007fff17d94bb0 R13: 0000000000000003 R14: 00007fff17d94b4c R15: 00007fce5540baa0